[v6.1] INFO: task hung in nfsd_umount
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syzbot
Jul 27, 2026, 3:55:33 PMJul 27
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: dc5c83b7f5f8 Linux 6.1.178
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1057f2ea580000
kernel config: https://syzkaller.appspot.com/x/.config?x=872c04466179833f
dashboard link: https://syzkaller.appspot.com/bug?extid=9f93d85267f3df0340fc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
userspace arch: arm64
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/96393e4697a3/disk-dc5c83b7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0d4afce44fab/vmlinux-dc5c83b7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4787e310d875/Image-dc5c83b7.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9f93d8...@syzkaller.appspotmail.com
INFO: task syz-executor:4329 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:0 pid:4329 ppid:1 flags:0x00000001
Call trace:
__switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0xdb4/0x1a6c kernel/sched/core.c:6563
schedule+0xc4/0x170 kernel/sched/core.c:6639
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6698
__mutex_lock_common+0xb20/0x1f3c kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
nfsd_shutdown_threads+0x60/0x204 fs/nfsd/nfssvc.c:633
nfsd_umount+0x48/0xf8 fs/nfsd/nfsctl.c:1409
deactivate_locked_super+0xb4/0x128 fs/super.c:332
deactivate_super+0xe4/0x104 fs/super.c:363
cleanup_mnt+0x3a8/0x430 fs/namespace.c:1191
__cleanup_mnt+0x20/0x30 fs/namespace.c:1198
task_work_run+0x1f4/0x280 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
do_notify_resume+0x20f8/0x2c84 arch/arm64/kernel/signal.c:1151
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
INFO: task syz-executor:4330 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:0 pid:4330 ppid:1 flags:0x00000009
Call trace:
__switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0xdb4/0x1a6c kernel/sched/core.c:6563
schedule+0xc4/0x170 kernel/sched/core.c:6639
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6698
__mutex_lock_common+0xb20/0x1f3c kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
nfsd_shutdown_threads+0x60/0x204 fs/nfsd/nfssvc.c:633
nfsd_umount+0x48/0xf8 fs/nfsd/nfsctl.c:1409
deactivate_locked_super+0xb4/0x128 fs/super.c:332
deactivate_super+0xe4/0x104 fs/super.c:363
cleanup_mnt+0x3a8/0x430 fs/namespace.c:1191
__cleanup_mnt+0x20/0x30 fs/namespace.c:1198
task_work_run+0x1f4/0x280 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
do_notify_resume+0x20f8/0x2c84 arch/arm64/kernel/signal.c:1151
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
INFO: task syz.2.150:4811 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.150 state:D stack:0 pid:4811 ppid:4341 flags:0x00000001
Call trace:
__switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0xdb4/0x1a6c kernel/sched/core.c:6563
schedule+0xc4/0x170 kernel/sched/core.c:6639
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6698
__mutex_lock_common+0xb20/0x1f3c kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
nfsctl_transaction_write+0x114/0x164 fs/nfsd/nfsctl.c:114
vfs_write+0x2a8/0x7c8 fs/read_write.c:582
ksys_write+0x12c/0x228 fs/read_write.c:637
__do_sys_write fs/read_write.c:649 [inline]
__se_sys_write fs/read_write.c:646 [inline]
__arm64_sys_write+0x7c/0x90 fs/read_write.c:646
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffff800015557db0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xc48 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
#0: ffff8000155585d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xc48 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/28:
#0: ffff800015557440 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:349
3 locks held by kworker/u4:4/1580:
#0: ffff0000c0029138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1
#1: ffff8000256a7c40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267
#2: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74
2 locks held by getty/4085:
#0: ffff0000d6589098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
#1: ffff80002095b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2e8/0xfa8 drivers/tty/n_tty.c:2198
2 locks held by syz-executor/4329:
#0: ffff0000cf9920e0 (&type->s_umount_key#51){+.+.}-{3:3}, at: deactivate_super+0xdc/0x104 fs/super.c:362
#1: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_shutdown_threads+0x60/0x204 fs/nfsd/nfssvc.c:633
2 locks held by syz-executor/4330:
#0: ffff0000f82a60e0 (&type->s_umount_key#51){+.+.}-{3:3}, at: deactivate_super+0xdc/0x104 fs/super.c:362
#1: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_shutdown_threads+0x60/0x204 fs/nfsd/nfssvc.c:633
2 locks held by syz-executor/4334:
#0: ffff0000dc3200e0 (&type->s_umount_key#51){+.+.}-{3:3}, at: deactivate_super+0xdc/0x104 fs/super.c:362
#1: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_shutdown_threads+0x60/0x204 fs/nfsd/nfssvc.c:633
3 locks held by kworker/0:5/4377:
#0: ffff0000d57ca138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1
#1: ffff8000213f7c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267
#2: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74
3 locks held by syz.2.150/4810:
#0: ffff0000d5a95768 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000cac72460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.2.150/4811:
#0: ffff0000d5a95c68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000cac72460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.5.166/5048:
#0: ffff0000dd731268 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000d9a60460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd4_write_time+0xbc/0x2ec fs/nfsd/nfsctl.c:980
3 locks held by syz.5.166/5050:
#0: ffff0000d527d9e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000d9a60460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd4_write_time+0xbc/0x2ec fs/nfsd/nfsctl.c:980
3 locks held by syz.5.166/5051:
#0: ffff0000d3cb8868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000d9a60460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.5.166/5052:
#0: ffff0000d527d768 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000d9a60460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.5.166/5053:
#0: ffff0000d527d4e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000d9a60460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.9.163/5099:
#0: ffff0000d4f08868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000f98aa460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.9.163/5100:
#0: ffff0000d0482368 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000f98aa460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.9.163/5102:
#0: ffff0000d97eeae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000f98aa460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.6.167/5112:
#0: ffff000101825c68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00010670c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
1 lock held by syz.6.167/5116:
#0: ffff000101825c68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
1 lock held by syz.6.167/5119:
#0: ffff000101825c68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
1 lock held by syz.6.167/5121:
#0: ffff000101825c68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
1 lock held by syz.6.167/5122:
#0: ffff000101825c68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
1 lock held by syz.6.167/5123:
#0: ffff000101825c68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
1 lock held by syz.6.167/5124:
#0: ffff000101825c68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
3 locks held by syz.6.167/5125:
#0: ffff00010197f9e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00010670c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.7.170/5131:
#0: ffff0001018e45e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000c333c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.8.172/5154:
#0: ffff000104870fe8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000d0f12460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.8.172/5155:
#0: ffff000104874868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000d0f12460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.8.172/5156:
#0: ffff000104871268 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000d0f12460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by kworker/1:9/5711:
#0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1
#1: ffff800022367c40 ((work_completion)(&tn->work)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267
#2: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74
3 locks held by kworker/1:13/5736:
#0: ffff0000d57ca138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1
#1: ffff800022407c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267
#2: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74
3 locks held by syz.1.201/5755:
#0: ffff0000ccdd7768 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff000106f86460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.1.201/5758:
#0: ffff0000d279d9e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff000106f86460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.1.201/5759:
#0: ffff0000d279c868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff000106f86460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
1 lock held by syz.1.201/5760:
#0: ffff0000d279c868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
3 locks held by syz.2.203/5763:
#0: ffff0000d0830fe8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000f975a460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.2.203/5764:
#0: ffff0000cca74868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000f975a460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.4.215/5803:
#0: ffff0000f9db6ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000d973e460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.3.217/5808:
#0: ffff0000d2f90ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000db89c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.3.217/5809:
#0: ffff0000d97e20e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000db89c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.3.217/5810:
#0: ffff0000d2f90868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000db89c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.0.229/5840:
#0: ffff0000d1347268 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000f676e460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.9.231/5902:
#0: ffff0000d0778d68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff000119ec6460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.5.234/5898:
#0: ffff0000d0778ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000c3278460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.5.234/5900:
#0: ffff0000ef19fc68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000c3278460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.6.246/5959:
#0: ffff00010b246ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff000120b30460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
1 lock held by syz.6.246/5961:
#0: ffff00010b246ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
1 lock held by syz.6.246/5965:
#0: ffff00010b246ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
3 locks held by syz.6.246/5969:
#0: ffff0000debecae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff000120b30460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.7.275/6065:
#0: ffff0001018faae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00012c89e460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.7.275/6066:
#0: ffff0000e0b82fe8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00012c89e460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.7.275/6067:
#0: ffff0000d1346fe8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00012c89e460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.8.399/6372:
#0: ffff000128800868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff000120c30460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.8.399/6375:
#0: ffff0000cb707268 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff000120c30460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.4.450/6507:
#0: ffff00010b2319e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000dbeb2460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.4.450/6510:
#0: ffff0000e0b82ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000dbeb2460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.3.433/6578:
#0: ffff0000dc1a3768 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000c4da2460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.1.479/6598:
#0: ffff000124152868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00012d110460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.1.479/6599:
#0: ffff0000d7bf3268 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00012d110460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.2.499/6651:
#0: ffff0000d5a945e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00013abea460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.2.499/6654:
#0: ffff0000d3f560e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00013abea460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.2.499/6656:
#0: ffff0000d3f56d68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00013abea460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
1 lock held by syz.2.499/6660:
#0: ffff0000d3f56d68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
3 locks held by syz.0.518/6754:
#0: ffff0000d07a0d68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014c6b0460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.0.518/6757:
#0: ffff0000d07a0ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014c6b0460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.0.518/6758:
#0: ffff0001048b54e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014c6b0460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.5.543/6854:
#0: ffff0001242cd9e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000c316c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.5.543/6855:
#0: ffff00012b7620e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000c316c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.7.539/6931:
#0: ffff0000d9c32ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00011a756460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.7.539/6935:
#0: ffff0000d9c33c68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00011a756460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.7.539/6937:
#0: ffff0000d9c334e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00011a756460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.9.564/6949:
#0: ffff0000d4e739e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014dc08460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.9.564/6953:
#0: ffff0000d8c245e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014dc08460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.9.564/6954:
#0: ffff0000d8c24fe8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014dc08460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.6.563/6951:
#0: ffff0000d4e72d68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014dc04460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.6.563/6952:
#0: ffff0000d4e725e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014dc04460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.8.567/6985:
#0: ffff0000d27c1768 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014cf8c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd4_write_time+0xbc/0x2ec fs/nfsd/nfsctl.c:980
3 locks held by syz.8.567/6986:
#0: ffff0000d11359e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014cf8c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd4_write_time+0xbc/0x2ec fs/nfsd/nfsctl.c:980
3 locks held by syz.8.567/6987:
#0: ffff0000d27c0368 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014cf8c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.8.567/6988:
#0: ffff0000d27c0868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014cf8c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.8.567/6989:
#0: ffff0000dd73b9e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014cf8c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
1 lock held by syz-executor/7024:
#0: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
#0: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x64c/0xcc4 net/core/rtnetlink.c:6163
1 lock held by syz.4.580/7044:
#0: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74
1 lock held by syz-executor/7046:
#0: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
#0: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x64c/0xcc4 net/core/rtnetlink.c:6163
1 lock held by syz-executor/7047:
#0: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
#0: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x64c/0xcc4 net/core/rtnetlink.c:6163
=============================================
---
This report is generated by a bot. It may contain errors.
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#syz undup
syzbot found the following issue on:
HEAD commit: dc5c83b7f5f8 Linux 6.1.178
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1057f2ea580000
kernel config: https://syzkaller.appspot.com/x/.config?x=872c04466179833f
dashboard link: https://syzkaller.appspot.com/bug?extid=9f93d85267f3df0340fc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
userspace arch: arm64
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/96393e4697a3/disk-dc5c83b7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0d4afce44fab/vmlinux-dc5c83b7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4787e310d875/Image-dc5c83b7.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9f93d8...@syzkaller.appspotmail.com
INFO: task syz-executor:4329 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:0 pid:4329 ppid:1 flags:0x00000001
Call trace:
__switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0xdb4/0x1a6c kernel/sched/core.c:6563
schedule+0xc4/0x170 kernel/sched/core.c:6639
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6698
__mutex_lock_common+0xb20/0x1f3c kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
nfsd_shutdown_threads+0x60/0x204 fs/nfsd/nfssvc.c:633
nfsd_umount+0x48/0xf8 fs/nfsd/nfsctl.c:1409
deactivate_locked_super+0xb4/0x128 fs/super.c:332
deactivate_super+0xe4/0x104 fs/super.c:363
cleanup_mnt+0x3a8/0x430 fs/namespace.c:1191
__cleanup_mnt+0x20/0x30 fs/namespace.c:1198
task_work_run+0x1f4/0x280 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
do_notify_resume+0x20f8/0x2c84 arch/arm64/kernel/signal.c:1151
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
INFO: task syz-executor:4330 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:0 pid:4330 ppid:1 flags:0x00000009
Call trace:
__switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0xdb4/0x1a6c kernel/sched/core.c:6563
schedule+0xc4/0x170 kernel/sched/core.c:6639
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6698
__mutex_lock_common+0xb20/0x1f3c kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
nfsd_shutdown_threads+0x60/0x204 fs/nfsd/nfssvc.c:633
nfsd_umount+0x48/0xf8 fs/nfsd/nfsctl.c:1409
deactivate_locked_super+0xb4/0x128 fs/super.c:332
deactivate_super+0xe4/0x104 fs/super.c:363
cleanup_mnt+0x3a8/0x430 fs/namespace.c:1191
__cleanup_mnt+0x20/0x30 fs/namespace.c:1198
task_work_run+0x1f4/0x280 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
do_notify_resume+0x20f8/0x2c84 arch/arm64/kernel/signal.c:1151
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
INFO: task syz.2.150:4811 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.150 state:D stack:0 pid:4811 ppid:4341 flags:0x00000001
Call trace:
__switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0xdb4/0x1a6c kernel/sched/core.c:6563
schedule+0xc4/0x170 kernel/sched/core.c:6639
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6698
__mutex_lock_common+0xb20/0x1f3c kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
nfsctl_transaction_write+0x114/0x164 fs/nfsd/nfsctl.c:114
vfs_write+0x2a8/0x7c8 fs/read_write.c:582
ksys_write+0x12c/0x228 fs/read_write.c:637
__do_sys_write fs/read_write.c:649 [inline]
__se_sys_write fs/read_write.c:646 [inline]
__arm64_sys_write+0x7c/0x90 fs/read_write.c:646
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffff800015557db0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xc48 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
#0: ffff8000155585d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xc48 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/28:
#0: ffff800015557440 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:349
3 locks held by kworker/u4:4/1580:
#0: ffff0000c0029138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1
#1: ffff8000256a7c40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267
#2: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74
2 locks held by getty/4085:
#0: ffff0000d6589098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
#1: ffff80002095b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2e8/0xfa8 drivers/tty/n_tty.c:2198
2 locks held by syz-executor/4329:
#0: ffff0000cf9920e0 (&type->s_umount_key#51){+.+.}-{3:3}, at: deactivate_super+0xdc/0x104 fs/super.c:362
#1: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_shutdown_threads+0x60/0x204 fs/nfsd/nfssvc.c:633
2 locks held by syz-executor/4330:
#0: ffff0000f82a60e0 (&type->s_umount_key#51){+.+.}-{3:3}, at: deactivate_super+0xdc/0x104 fs/super.c:362
#1: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_shutdown_threads+0x60/0x204 fs/nfsd/nfssvc.c:633
2 locks held by syz-executor/4334:
#0: ffff0000dc3200e0 (&type->s_umount_key#51){+.+.}-{3:3}, at: deactivate_super+0xdc/0x104 fs/super.c:362
#1: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_shutdown_threads+0x60/0x204 fs/nfsd/nfssvc.c:633
3 locks held by kworker/0:5/4377:
#0: ffff0000d57ca138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1
#1: ffff8000213f7c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267
#2: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74
3 locks held by syz.2.150/4810:
#0: ffff0000d5a95768 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000cac72460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.2.150/4811:
#0: ffff0000d5a95c68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000cac72460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.5.166/5048:
#0: ffff0000dd731268 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000d9a60460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd4_write_time+0xbc/0x2ec fs/nfsd/nfsctl.c:980
3 locks held by syz.5.166/5050:
#0: ffff0000d527d9e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000d9a60460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd4_write_time+0xbc/0x2ec fs/nfsd/nfsctl.c:980
3 locks held by syz.5.166/5051:
#0: ffff0000d3cb8868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000d9a60460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.5.166/5052:
#0: ffff0000d527d768 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000d9a60460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.5.166/5053:
#0: ffff0000d527d4e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000d9a60460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.9.163/5099:
#0: ffff0000d4f08868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000f98aa460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.9.163/5100:
#0: ffff0000d0482368 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000f98aa460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.9.163/5102:
#0: ffff0000d97eeae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000f98aa460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.6.167/5112:
#0: ffff000101825c68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00010670c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
1 lock held by syz.6.167/5116:
#0: ffff000101825c68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
1 lock held by syz.6.167/5119:
#0: ffff000101825c68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
1 lock held by syz.6.167/5121:
#0: ffff000101825c68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
1 lock held by syz.6.167/5122:
#0: ffff000101825c68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
1 lock held by syz.6.167/5123:
#0: ffff000101825c68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
1 lock held by syz.6.167/5124:
#0: ffff000101825c68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
3 locks held by syz.6.167/5125:
#0: ffff00010197f9e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00010670c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.7.170/5131:
#0: ffff0001018e45e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000c333c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.8.172/5154:
#0: ffff000104870fe8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000d0f12460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.8.172/5155:
#0: ffff000104874868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000d0f12460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.8.172/5156:
#0: ffff000104871268 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000d0f12460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by kworker/1:9/5711:
#0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1
#1: ffff800022367c40 ((work_completion)(&tn->work)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267
#2: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74
3 locks held by kworker/1:13/5736:
#0: ffff0000d57ca138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1
#1: ffff800022407c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267
#2: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74
3 locks held by syz.1.201/5755:
#0: ffff0000ccdd7768 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff000106f86460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.1.201/5758:
#0: ffff0000d279d9e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff000106f86460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.1.201/5759:
#0: ffff0000d279c868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff000106f86460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
1 lock held by syz.1.201/5760:
#0: ffff0000d279c868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
3 locks held by syz.2.203/5763:
#0: ffff0000d0830fe8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000f975a460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.2.203/5764:
#0: ffff0000cca74868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000f975a460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.4.215/5803:
#0: ffff0000f9db6ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000d973e460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.3.217/5808:
#0: ffff0000d2f90ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000db89c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.3.217/5809:
#0: ffff0000d97e20e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000db89c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.3.217/5810:
#0: ffff0000d2f90868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000db89c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.0.229/5840:
#0: ffff0000d1347268 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000f676e460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.9.231/5902:
#0: ffff0000d0778d68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff000119ec6460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.5.234/5898:
#0: ffff0000d0778ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000c3278460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.5.234/5900:
#0: ffff0000ef19fc68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000c3278460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.6.246/5959:
#0: ffff00010b246ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff000120b30460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
1 lock held by syz.6.246/5961:
#0: ffff00010b246ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
1 lock held by syz.6.246/5965:
#0: ffff00010b246ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
3 locks held by syz.6.246/5969:
#0: ffff0000debecae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff000120b30460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.7.275/6065:
#0: ffff0001018faae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00012c89e460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.7.275/6066:
#0: ffff0000e0b82fe8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00012c89e460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.7.275/6067:
#0: ffff0000d1346fe8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00012c89e460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.8.399/6372:
#0: ffff000128800868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff000120c30460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.8.399/6375:
#0: ffff0000cb707268 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff000120c30460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.4.450/6507:
#0: ffff00010b2319e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000dbeb2460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.4.450/6510:
#0: ffff0000e0b82ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000dbeb2460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.3.433/6578:
#0: ffff0000dc1a3768 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000c4da2460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.1.479/6598:
#0: ffff000124152868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00012d110460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.1.479/6599:
#0: ffff0000d7bf3268 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00012d110460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.2.499/6651:
#0: ffff0000d5a945e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00013abea460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.2.499/6654:
#0: ffff0000d3f560e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00013abea460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.2.499/6656:
#0: ffff0000d3f56d68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00013abea460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
1 lock held by syz.2.499/6660:
#0: ffff0000d3f56d68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
3 locks held by syz.0.518/6754:
#0: ffff0000d07a0d68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014c6b0460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.0.518/6757:
#0: ffff0000d07a0ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014c6b0460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.0.518/6758:
#0: ffff0001048b54e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014c6b0460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.5.543/6854:
#0: ffff0001242cd9e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000c316c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.5.543/6855:
#0: ffff00012b7620e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff0000c316c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.7.539/6931:
#0: ffff0000d9c32ae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00011a756460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.7.539/6935:
#0: ffff0000d9c33c68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00011a756460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.7.539/6937:
#0: ffff0000d9c334e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00011a756460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.9.564/6949:
#0: ffff0000d4e739e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014dc08460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.9.564/6953:
#0: ffff0000d8c245e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014dc08460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.9.564/6954:
#0: ffff0000d8c24fe8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014dc08460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
3 locks held by syz.6.563/6951:
#0: ffff0000d4e72d68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014dc04460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.6.563/6952:
#0: ffff0000d4e725e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014dc04460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.8.567/6985:
#0: ffff0000d27c1768 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014cf8c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd4_write_time+0xbc/0x2ec fs/nfsd/nfsctl.c:980
3 locks held by syz.8.567/6986:
#0: ffff0000d11359e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014cf8c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd4_write_time+0xbc/0x2ec fs/nfsd/nfsctl.c:980
3 locks held by syz.8.567/6987:
#0: ffff0000d27c0368 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014cf8c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_versions+0xa4/0xa34 fs/nfsd/nfsctl.c:681
3 locks held by syz.8.567/6988:
#0: ffff0000d27c0868 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014cf8c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xbc/0x9f0 fs/nfsd/nfsctl.c:846
3 locks held by syz.8.567/6989:
#0: ffff0000dd73b9e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x118/0x17c fs/file.c:1038
#1: ffff00014cf8c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x254/0x7c8 fs/read_write.c:580
#2: ffff8000157e3f68 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_svc+0x74/0x948 fs/nfsd/nfssvc.c:783
1 lock held by syz-executor/7024:
#0: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
#0: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x64c/0xcc4 net/core/rtnetlink.c:6163
1 lock held by syz.4.580/7044:
#0: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74
1 lock held by syz-executor/7046:
#0: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
#0: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x64c/0xcc4 net/core/rtnetlink.c:6163
1 lock held by syz-executor/7047:
#0: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
#0: ffff800017a04e48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x64c/0xcc4 net/core/rtnetlink.c:6163
=============================================
---
This report is generated by a bot. It may contain errors.
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syzbot
Jul 28, 2026, 8:58:24 AMJul 28
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: c5596480c50e Linux 6.6.145
syzbot found the following issue on:
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=163fe499580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f0bc3d90c30838b5
dashboard link: https://syzkaller.appspot.com/bug?extid=9624214b5aa7ac2f6851
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/eb5cda0a8020/disk-c5596480.raw.xz
Downloadable assets:
vmlinux: https://storage.googleapis.com/syzbot-assets/ca05ff2fc502/vmlinux-c5596480.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6daf3255b985/bzImage-c5596480.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
INFO: task syz-executor:14792 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:20712 pid:14792 ppid:1 flags:0x00004004
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
schedule+0xbd/0x170 kernel/sched/core.c:6775
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6834
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x673/0xc80 kernel/locking/mutex.c:747
nfsd_shutdown_threads+0x53/0x1a0 fs/nfsd/nfssvc.c:638
nfsd_umount+0x42/0xc0 fs/nfsd/nfsctl.c:1464
deactivate_locked_super+0x97/0x100 fs/super.c:481
cleanup_mnt+0x3d7/0x460 fs/namespace.c:1259
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fbe7999f0d7
RSP: 002b:00007ffff9f2c3f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fbe79a3330a RCX: 00007fbe7999f0d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffff9f2c4b0
RBP: 00007ffff9f2c4b0 R08: 00007ffff9f2d4b0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffff9f2d540
R13: 00007fbe79a3330a R14: 00000000000ec3c6 R15: 00007ffff9f2d580
</TASK>
INFO: task syz-executor:16236 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21352 pid:16236 ppid:1 flags:0x00004004
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
schedule+0xbd/0x170 kernel/sched/core.c:6775
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6834
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x673/0xc80 kernel/locking/mutex.c:747
nfsd_shutdown_threads+0x53/0x1a0 fs/nfsd/nfssvc.c:638
nfsd_umount+0x42/0xc0 fs/nfsd/nfsctl.c:1464
deactivate_locked_super+0x97/0x100 fs/super.c:481
cleanup_mnt+0x3d7/0x460 fs/namespace.c:1259
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2347d9f0d7
RSP: 002b:00007ffd59fa2488 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f2347e3330a RCX: 00007f2347d9f0d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd59fa2540
RBP: 00007ffd59fa2540 R08: 00007ffd59fa3540 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd59fa35d0
R13: 00007f2347e3330a R14: 00000000000ecd55 R15: 00007ffd59fa3610
</TASK>
Showing all locks held in the system:
#0: ffff8880b8f3c298 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:559
#1: ffff8880b8f28a00 (psi_seq){-.-.}-{0:0}, at: psi_sched_switch kernel/sched/stats.h:189 [inline]
#1: ffff8880b8f28a00 (psi_seq){-.-.}-{0:0}, at: __schedule+0x21d3/0x4660 kernel/sched/core.c:6696
1 lock held by khungtaskd/29:
#0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
2 locks held by getty/5531:
#0: ffff88814c59c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x428/0x1370 drivers/tty/n_tty.c:2217
2 locks held by syz-executor/14792:
#0: ffff88807cfda0e0 (&type->s_umount_key#88){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88807cfda0e0 (&type->s_umount_key#88){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88807cfda0e0 (&type->s_umount_key#88){+.+.}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffffffff8d3e17a8 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_shutdown_threads+0x53/0x1a0 fs/nfsd/nfssvc.c:638
2 locks held by syz-executor/16236:
#0: ffff88801e2ac0e0 (&type->s_umount_key#88){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88801e2ac0e0 (&type->s_umount_key#88){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88801e2ac0e0 (&type->s_umount_key#88){+.+.}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffffffff8d3e17a8 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_shutdown_threads+0x53/0x1a0 fs/nfsd/nfssvc.c:638
3 locks held by syz.2.3665/17990:
#0: ffff88802399c348 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2a3/0x330 fs/file.c:1040
#1: ffff88807990e418 (sb_writers#26){.+.+}-{0:0}, at: vfs_write+0x21e/0x9a0 fs/read_write.c:580
#2: ffffffff8d3e17a8 (nfsd_mutex){+.+.}-{3:3}, at: write_ports+0xb7/0xfa0 fs/nfsd/nfsctl.c:843
4 locks held by syz.3.4275/20096:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Call Trace:
<TASK>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf59/0xfa0 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11 Comm: kworker/u4:0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:clear_page_erms+0xd/0x10 arch/x86/lib/clear_page_64.S:51
Code: 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d9 90 c3 90 90 90 90 90 90 90 f3 0f 1e fa b9 00 10 00 00 31 c0 f3 aa <c3> 90 90 f3 0f 1e fa 48 83 f9 40 73 36 83 f9 08 73 0f 85 c9 74 0a
RSP: 0018:ffffc900001075c8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffff8880595d8000 RSI: 0000000000000008 RDI: ffff8880595d9000
RBP: ffff88813fffc310 R08: ffffea0001657637 R09: 0000000000000000
R10: ffffed100b2bb000 R11: fffff940002caec7 R12: 0000000000000000
R13: 0000000000000001 R14: ffffea0001657600 R15: 0000000000000008
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f68eb0d5fe0 CR3: 000000000cf32000 CR4: 00000000003506f0
Call Trace:
<TASK>
clear_page arch/x86/include/asm/page_64.h:54 [inline]
clear_highpage_kasan_tagged include/linux/highmem.h:248 [inline]
kernel_init_pages mm/page_alloc.c:1101 [inline]
post_alloc_hook+0xf3/0x200 mm/page_alloc.c:1580
prep_new_page mm/page_alloc.c:1589 [inline]
get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501
alloc_slab_page+0x5d/0x180 mm/slub.c:1881
allocate_slab mm/slub.c:2028 [inline]
new_slab+0x87/0x2d0 mm/slub.c:2081
___slab_alloc+0xc5c/0x12f0 mm/slub.c:3253
__slab_alloc mm/slub.c:3339 [inline]
__slab_alloc_node mm/slub.c:3392 [inline]
slab_alloc_node mm/slub.c:3485 [inline]
__kmem_cache_alloc_node+0x11f/0x250 mm/slub.c:3534
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc_node_track_caller+0xa4/0x230 mm/slab_common.c:1027
kmalloc_reserve+0x116/0x240 net/core/skbuff.c:584
__alloc_skb+0x138/0x2c0 net/core/skbuff.c:653
alloc_skb include/linux/skbuff.h:1316 [inline]
nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
nsim_dev_trap_report_work+0x253/0xa90 drivers/net/netdevsim/dev.c:851
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>
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