[v5.15] INFO: task hung in unregister_shrinker
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syzbot
Apr 13, 2023, 12:43:35 AM4/13/23
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: d86dfc4d95cd Linux 5.15.106
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16de290fc80000
kernel config: https://syzkaller.appspot.com/x/.config?x=639d55ab480652c5
dashboard link: https://syzkaller.appspot.com/bug?extid=1b34f7e6ce4bb2610b77
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b2a94107dd69/disk-d86dfc4d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/398f8d288cb9/vmlinux-d86dfc4d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9b790c7e7c8c/Image-d86dfc4d.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1b34f7...@syzkaller.appspotmail.com
INFO: task syz-executor.1:4092 blocked for more than 143 seconds.
Not tainted 5.15.106-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1 state:D stack: 0 pid: 4092 ppid: 1 flags:0x00000009
Call trace:
__switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518
context_switch kernel/sched/core.c:5026 [inline]
__schedule+0xf10/0x1e38 kernel/sched/core.c:6372
schedule+0x11c/0x1c8 kernel/sched/core.c:6455
rwsem_down_write_slowpath+0xca8/0x1340 kernel/locking/rwsem.c:1157
__down_write_common kernel/locking/rwsem.c:1284 [inline]
__down_write kernel/locking/rwsem.c:1293 [inline]
down_write+0x25c/0x260 kernel/locking/rwsem.c:1542
unregister_shrinker+0x78/0x2e4 mm/vmscan.c:678
deactivate_locked_super+0x98/0x13c fs/super.c:334
deactivate_super+0x108/0x128 fs/super.c:366
cleanup_mnt+0x3c0/0x474 fs/namespace.c:1143
__cleanup_mnt+0x20/0x30 fs/namespace.c:1150
task_work_run+0x130/0x1e4 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
do_notify_resume+0x262c/0x32b8 arch/arm64/kernel/signal.c:946
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline]
el0_svc+0xfc/0x1f0 arch/arm64/kernel/entry-common.c:597
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
INFO: task syz-executor.5:7010 blocked for more than 143 seconds.
Not tainted 5.15.106-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.5 state:D stack: 0 pid: 7010 ppid: 4845 flags:0x00000009
Call trace:
__switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518
context_switch kernel/sched/core.c:5026 [inline]
__schedule+0xf10/0x1e38 kernel/sched/core.c:6372
schedule+0x11c/0x1c8 kernel/sched/core.c:6455
schedule_timeout+0xb8/0x344 kernel/time/timer.c:1860
do_wait_for_common+0x214/0x388 kernel/sched/completion.c:85
__wait_for_common kernel/sched/completion.c:106 [inline]
wait_for_common kernel/sched/completion.c:117 [inline]
wait_for_completion+0x4c/0x64 kernel/sched/completion.c:138
xfs_buf_iowait+0x16c/0x704 fs/xfs/xfs_buf.c:1573
xfs_buf_delwri_pushbuf+0x330/0x5e4 fs/xfs/xfs_buf.c:2251
xfs_qm_flush_one+0x1fc/0x2cc fs/xfs/xfs_qm.c:1249
xfs_qm_dquot_walk+0x1f0/0x424 fs/xfs/xfs_qm.c:86
xfs_qm_quotacheck+0x288/0x56c fs/xfs/xfs_qm.c:1335
xfs_qm_mount_quotas+0x2ac/0x578 fs/xfs/xfs_qm.c:1441
xfs_mountfs+0x11e4/0x1778 fs/xfs/xfs_mount.c:904
xfs_fs_fill_super+0xd64/0xf60 fs/xfs/xfs_super.c:1658
get_tree_bdev+0x360/0x54c fs/super.c:1303
xfs_fs_get_tree+0x28/0x38 fs/xfs/xfs_super.c:1705
vfs_get_tree+0x90/0x274 fs/super.c:1508
do_new_mount+0x25c/0x8c8 fs/namespace.c:2994
path_mount+0x590/0x104c fs/namespace.c:3324
do_mount fs/namespace.c:3337 [inline]
__do_sys_mount fs/namespace.c:3545 [inline]
__se_sys_mount fs/namespace.c:3522 [inline]
__arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3522
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
INFO: task syz-executor.2:7014 blocked for more than 143 seconds.
Not tainted 5.15.106-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack: 0 pid: 7014 ppid: 4094 flags:0x00000009
Call trace:
__switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518
context_switch kernel/sched/core.c:5026 [inline]
__schedule+0xf10/0x1e38 kernel/sched/core.c:6372
schedule+0x11c/0x1c8 kernel/sched/core.c:6455
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6514
__mutex_lock_common+0xba0/0x2154 kernel/locking/mutex.c:669
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0xa4/0xf8 kernel/locking/mutex.c:743
xfs_qm_dqfree_one+0x74/0x1b0 fs/xfs/xfs_qm.c:1607
xfs_qm_shrink_scan+0x280/0x354 fs/xfs/xfs_qm.c:523
do_shrink_slab+0x4b4/0x10b0 mm/vmscan.c:758
shrink_slab+0x1f8/0x894 mm/vmscan.c:918
drop_slab_node+0xcc/0x170 mm/vmscan.c:953
drop_slab+0x98/0x140 mm/vmscan.c:963
drop_caches_sysctl_handler+0x178/0x394 fs/drop_caches.c:66
proc_sys_call_handler+0x4cc/0x7cc fs/proc/proc_sysctl.c:587
proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:613
do_iter_readv_writev+0x420/0x5f8
do_iter_write+0x1b8/0x664 fs/read_write.c:855
vfs_iter_write+0x88/0xac fs/read_write.c:896
iter_file_splice_write+0x618/0xc48 fs/splice.c:689
do_splice_from fs/splice.c:767 [inline]
direct_splice_actor+0xe4/0x1c0 fs/splice.c:936
splice_direct_to_actor+0x408/0x9a0 fs/splice.c:891
do_splice_direct+0x1f4/0x334 fs/splice.c:979
do_sendfile+0x4bc/0xc70 fs/read_write.c:1249
__do_sys_sendfile64 fs/read_write.c:1311 [inline]
__se_sys_sendfile64 fs/read_write.c:1303 [inline]
__arm64_sys_sendfile64+0x264/0x408 fs/read_write.c:1303
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffff800014aa1660 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:268
3 locks held by kworker/u4:1/136:
2 locks held by getty/3734:
#0: ffff0000d281b098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340
#1: ffff800018e102e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1200 drivers/tty/n_tty.c:2147
2 locks held by syz-executor.1/4092:
#0: ffff0000dbbbc0e0 (&type->s_umount_key#48){+.+.}-{3:3}, at: deactivate_super+0x100/0x128 fs/super.c:365
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x78/0x2e4 mm/vmscan.c:678
3 locks held by syz-executor.5/7010:
#0: ffff0000dc66c0e0 (&type->s_umount_key#54/1){+.+.}-{3:3}, at: alloc_super+0x1b8/0x844 fs/super.c:229
#1: ffff0001368db158 (&qinf->qi_tree_lock){+.+.}-{3:3}, at: xfs_qm_dquot_walk+0x130/0x424 fs/xfs/xfs_qm.c:73
#2: ffff00011d3a95d8 (&dqp->q_qlock){+.+.}-{3:3}, at: xfs_dqlock fs/xfs/xfs_dquot.h:133 [inline]
#2: ffff00011d3a95d8 (&dqp->q_qlock){+.+.}-{3:3}, at: xfs_qm_flush_one+0xc8/0x2cc fs/xfs/xfs_qm.c:1225
3 locks held by syz-executor.2/7014:
#0: ffff0000d4c7c460 (sb_writers#4){.+.+}-{0:0}, at: do_sendfile+0x4a0/0xc70 fs/read_write.c:1248
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0x10c/0x894 mm/vmscan.c:908
#2: ffff0001368db158 (&qinf->qi_tree_lock){+.+.}-{3:3}, at: xfs_qm_dqfree_one+0x74/0x1b0 fs/xfs/xfs_qm.c:1607
3 locks held by syz-executor.4/7070:
#0: ffff0000c5078660 (&bdev->bd_fsfreeze_mutex){+.+.}-{3:3}, at: mount_bdev+0x8c/0x368 fs/super.c:1345
#1: ffff00011108a0e0 (&type->s_umount_key#26/1){+.+.}-{3:3}, at: alloc_super+0x1b8/0x844 fs/super.c:229
#2: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
#2: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0xa4/0x75c mm/vmscan.c:620
3 locks held by syz-executor.3/7071:
#0: ffff0000c5077020 (&bdev->bd_fsfreeze_mutex){+.+.}-{3:3}, at: mount_bdev+0x8c/0x368 fs/super.c:1345
#1: ffff00011301c0e0 (&type->s_umount_key#50/1){+.+.}-{3:3}, at: alloc_super+0x1b8/0x844 fs/super.c:229
#2: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
#2: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0xa4/0x75c mm/vmscan.c:620
2 locks held by syz-executor.5/7087:
#0: ffff000136f180e0 (&type->s_umount_key#22/1){+.+.}-{3:3}, at: alloc_super+0x1b8/0x844 fs/super.c:229
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0xa4/0x75c mm/vmscan.c:620
2 locks held by syz-executor.2/7091:
#0: ffff000136b0a0e0 (&type->s_umount_key#22/1){+.+.}-{3:3}, at: alloc_super+0x1b8/0x844 fs/super.c:229
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0xa4/0x75c mm/vmscan.c:620
2 locks held by syz-executor.5/7094:
#0: ffff0001211760e0 (&type->s_umount_key#22/1){+.+.}-{3:3}, at: alloc_super+0x1b8/0x844 fs/super.c:229
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0xa4/0x75c mm/vmscan.c:620
2 locks held by syz-executor.2/7099:
#0: ffff0000c89c20e0 (&type->s_umount_key#22/1){+.+.}-{3:3}, at: alloc_super+0x1b8/0x844 fs/super.c:229
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0xa4/0x75c mm/vmscan.c:620
=============================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following issue on:
HEAD commit: d86dfc4d95cd Linux 5.15.106
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16de290fc80000
kernel config: https://syzkaller.appspot.com/x/.config?x=639d55ab480652c5
dashboard link: https://syzkaller.appspot.com/bug?extid=1b34f7e6ce4bb2610b77
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b2a94107dd69/disk-d86dfc4d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/398f8d288cb9/vmlinux-d86dfc4d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9b790c7e7c8c/Image-d86dfc4d.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1b34f7...@syzkaller.appspotmail.com
INFO: task syz-executor.1:4092 blocked for more than 143 seconds.
Not tainted 5.15.106-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1 state:D stack: 0 pid: 4092 ppid: 1 flags:0x00000009
Call trace:
__switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518
context_switch kernel/sched/core.c:5026 [inline]
__schedule+0xf10/0x1e38 kernel/sched/core.c:6372
schedule+0x11c/0x1c8 kernel/sched/core.c:6455
rwsem_down_write_slowpath+0xca8/0x1340 kernel/locking/rwsem.c:1157
__down_write_common kernel/locking/rwsem.c:1284 [inline]
__down_write kernel/locking/rwsem.c:1293 [inline]
down_write+0x25c/0x260 kernel/locking/rwsem.c:1542
unregister_shrinker+0x78/0x2e4 mm/vmscan.c:678
deactivate_locked_super+0x98/0x13c fs/super.c:334
deactivate_super+0x108/0x128 fs/super.c:366
cleanup_mnt+0x3c0/0x474 fs/namespace.c:1143
__cleanup_mnt+0x20/0x30 fs/namespace.c:1150
task_work_run+0x130/0x1e4 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
do_notify_resume+0x262c/0x32b8 arch/arm64/kernel/signal.c:946
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline]
el0_svc+0xfc/0x1f0 arch/arm64/kernel/entry-common.c:597
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
INFO: task syz-executor.5:7010 blocked for more than 143 seconds.
Not tainted 5.15.106-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.5 state:D stack: 0 pid: 7010 ppid: 4845 flags:0x00000009
Call trace:
__switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518
context_switch kernel/sched/core.c:5026 [inline]
__schedule+0xf10/0x1e38 kernel/sched/core.c:6372
schedule+0x11c/0x1c8 kernel/sched/core.c:6455
schedule_timeout+0xb8/0x344 kernel/time/timer.c:1860
do_wait_for_common+0x214/0x388 kernel/sched/completion.c:85
__wait_for_common kernel/sched/completion.c:106 [inline]
wait_for_common kernel/sched/completion.c:117 [inline]
wait_for_completion+0x4c/0x64 kernel/sched/completion.c:138
xfs_buf_iowait+0x16c/0x704 fs/xfs/xfs_buf.c:1573
xfs_buf_delwri_pushbuf+0x330/0x5e4 fs/xfs/xfs_buf.c:2251
xfs_qm_flush_one+0x1fc/0x2cc fs/xfs/xfs_qm.c:1249
xfs_qm_dquot_walk+0x1f0/0x424 fs/xfs/xfs_qm.c:86
xfs_qm_quotacheck+0x288/0x56c fs/xfs/xfs_qm.c:1335
xfs_qm_mount_quotas+0x2ac/0x578 fs/xfs/xfs_qm.c:1441
xfs_mountfs+0x11e4/0x1778 fs/xfs/xfs_mount.c:904
xfs_fs_fill_super+0xd64/0xf60 fs/xfs/xfs_super.c:1658
get_tree_bdev+0x360/0x54c fs/super.c:1303
xfs_fs_get_tree+0x28/0x38 fs/xfs/xfs_super.c:1705
vfs_get_tree+0x90/0x274 fs/super.c:1508
do_new_mount+0x25c/0x8c8 fs/namespace.c:2994
path_mount+0x590/0x104c fs/namespace.c:3324
do_mount fs/namespace.c:3337 [inline]
__do_sys_mount fs/namespace.c:3545 [inline]
__se_sys_mount fs/namespace.c:3522 [inline]
__arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3522
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
INFO: task syz-executor.2:7014 blocked for more than 143 seconds.
Not tainted 5.15.106-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack: 0 pid: 7014 ppid: 4094 flags:0x00000009
Call trace:
__switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518
context_switch kernel/sched/core.c:5026 [inline]
__schedule+0xf10/0x1e38 kernel/sched/core.c:6372
schedule+0x11c/0x1c8 kernel/sched/core.c:6455
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6514
__mutex_lock_common+0xba0/0x2154 kernel/locking/mutex.c:669
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0xa4/0xf8 kernel/locking/mutex.c:743
xfs_qm_dqfree_one+0x74/0x1b0 fs/xfs/xfs_qm.c:1607
xfs_qm_shrink_scan+0x280/0x354 fs/xfs/xfs_qm.c:523
do_shrink_slab+0x4b4/0x10b0 mm/vmscan.c:758
shrink_slab+0x1f8/0x894 mm/vmscan.c:918
drop_slab_node+0xcc/0x170 mm/vmscan.c:953
drop_slab+0x98/0x140 mm/vmscan.c:963
drop_caches_sysctl_handler+0x178/0x394 fs/drop_caches.c:66
proc_sys_call_handler+0x4cc/0x7cc fs/proc/proc_sysctl.c:587
proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:613
do_iter_readv_writev+0x420/0x5f8
do_iter_write+0x1b8/0x664 fs/read_write.c:855
vfs_iter_write+0x88/0xac fs/read_write.c:896
iter_file_splice_write+0x618/0xc48 fs/splice.c:689
do_splice_from fs/splice.c:767 [inline]
direct_splice_actor+0xe4/0x1c0 fs/splice.c:936
splice_direct_to_actor+0x408/0x9a0 fs/splice.c:891
do_splice_direct+0x1f4/0x334 fs/splice.c:979
do_sendfile+0x4bc/0xc70 fs/read_write.c:1249
__do_sys_sendfile64 fs/read_write.c:1311 [inline]
__se_sys_sendfile64 fs/read_write.c:1303 [inline]
__arm64_sys_sendfile64+0x264/0x408 fs/read_write.c:1303
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffff800014aa1660 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:268
3 locks held by kworker/u4:1/136:
2 locks held by getty/3734:
#0: ffff0000d281b098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340
#1: ffff800018e102e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1200 drivers/tty/n_tty.c:2147
2 locks held by syz-executor.1/4092:
#0: ffff0000dbbbc0e0 (&type->s_umount_key#48){+.+.}-{3:3}, at: deactivate_super+0x100/0x128 fs/super.c:365
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x78/0x2e4 mm/vmscan.c:678
3 locks held by syz-executor.5/7010:
#0: ffff0000dc66c0e0 (&type->s_umount_key#54/1){+.+.}-{3:3}, at: alloc_super+0x1b8/0x844 fs/super.c:229
#1: ffff0001368db158 (&qinf->qi_tree_lock){+.+.}-{3:3}, at: xfs_qm_dquot_walk+0x130/0x424 fs/xfs/xfs_qm.c:73
#2: ffff00011d3a95d8 (&dqp->q_qlock){+.+.}-{3:3}, at: xfs_dqlock fs/xfs/xfs_dquot.h:133 [inline]
#2: ffff00011d3a95d8 (&dqp->q_qlock){+.+.}-{3:3}, at: xfs_qm_flush_one+0xc8/0x2cc fs/xfs/xfs_qm.c:1225
3 locks held by syz-executor.2/7014:
#0: ffff0000d4c7c460 (sb_writers#4){.+.+}-{0:0}, at: do_sendfile+0x4a0/0xc70 fs/read_write.c:1248
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0x10c/0x894 mm/vmscan.c:908
#2: ffff0001368db158 (&qinf->qi_tree_lock){+.+.}-{3:3}, at: xfs_qm_dqfree_one+0x74/0x1b0 fs/xfs/xfs_qm.c:1607
3 locks held by syz-executor.4/7070:
#0: ffff0000c5078660 (&bdev->bd_fsfreeze_mutex){+.+.}-{3:3}, at: mount_bdev+0x8c/0x368 fs/super.c:1345
#1: ffff00011108a0e0 (&type->s_umount_key#26/1){+.+.}-{3:3}, at: alloc_super+0x1b8/0x844 fs/super.c:229
#2: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
#2: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0xa4/0x75c mm/vmscan.c:620
3 locks held by syz-executor.3/7071:
#0: ffff0000c5077020 (&bdev->bd_fsfreeze_mutex){+.+.}-{3:3}, at: mount_bdev+0x8c/0x368 fs/super.c:1345
#1: ffff00011301c0e0 (&type->s_umount_key#50/1){+.+.}-{3:3}, at: alloc_super+0x1b8/0x844 fs/super.c:229
#2: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
#2: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0xa4/0x75c mm/vmscan.c:620
2 locks held by syz-executor.5/7087:
#0: ffff000136f180e0 (&type->s_umount_key#22/1){+.+.}-{3:3}, at: alloc_super+0x1b8/0x844 fs/super.c:229
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0xa4/0x75c mm/vmscan.c:620
2 locks held by syz-executor.2/7091:
#0: ffff000136b0a0e0 (&type->s_umount_key#22/1){+.+.}-{3:3}, at: alloc_super+0x1b8/0x844 fs/super.c:229
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0xa4/0x75c mm/vmscan.c:620
2 locks held by syz-executor.5/7094:
#0: ffff0001211760e0 (&type->s_umount_key#22/1){+.+.}-{3:3}, at: alloc_super+0x1b8/0x844 fs/super.c:229
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0xa4/0x75c mm/vmscan.c:620
2 locks held by syz-executor.2/7099:
#0: ffff0000c89c20e0 (&type->s_umount_key#22/1){+.+.}-{3:3}, at: alloc_super+0x1b8/0x844 fs/super.c:229
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
#1: ffff800014b325f0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0xa4/0x75c mm/vmscan.c:620
=============================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot
May 1, 2023, 6:50:56 PM5/1/23
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: 8a7f2a5c5aa1 Linux 5.15.110
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=168d655fc80000
kernel config: https://syzkaller.appspot.com/x/.config?x=ba8d5c9d6c5289f
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=131f05d8280000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fc04f54c047f/disk-8a7f2a5c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6b4ba4cb1191/vmlinux-8a7f2a5c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d927dc3f9670/bzImage-8a7f2a5c.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/57a80301d4ec/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1b34f7...@syzkaller.appspotmail.com
INFO: task syz-executor293:3557 blocked for more than 143 seconds.
Not tainted 5.15.110-syzkaller #0
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5026 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6372
schedule+0x11b/0x1f0 kernel/sched/core.c:6455
rwsem_down_write_slowpath+0xebb/0x15c0 kernel/locking/rwsem.c:1157
unregister_shrinker+0x60/0x320 mm/vmscan.c:678
xfs_free_buftarg+0x12/0x60 fs/xfs/xfs_buf.c:1889
xfs_close_devices+0x181/0x1b0 fs/xfs/xfs_super.c:390
xfs_fs_put_super+0x234/0x2b0 fs/xfs/xfs_super.c:1098
generic_shutdown_super+0x136/0x2c0 fs/super.c:475
kill_block_super+0x7a/0xe0 fs/super.c:1405
deactivate_locked_super+0xa0/0x110 fs/super.c:335
cleanup_mnt+0x44e/0x500 fs/namespace.c:1143
task_work_run+0x129/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f737ee92eb7
RSP: 002b:00007ffd6bdf77f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f737ee92eb7
RDX: 00007ffd6bdf78b9 RSI: 000000000000000a RDI: 00007ffd6bdf78b0
RBP: 00007ffd6bdf78b0 R08: 00000000ffffffff R09: 00007ffd6bdf7690
R10: 0000555556504653 R11: 0000000000000202 R12: 00007ffd6bdf8920
R13: 00005555565045f0 R14: 00007ffd6bdf7820 R15: 0000000000000003
</TASK>
INFO: task syz-executor293:3559 blocked for more than 143 seconds.
Not tainted 5.15.110-syzkaller #0
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5026 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6372
schedule+0x11b/0x1f0 kernel/sched/core.c:6455
rwsem_down_write_slowpath+0xebb/0x15c0 kernel/locking/rwsem.c:1157
unregister_shrinker+0x60/0x320 mm/vmscan.c:678
xfs_free_buftarg+0x12/0x60 fs/xfs/xfs_buf.c:1889
xfs_close_devices+0x181/0x1b0 fs/xfs/xfs_super.c:390
xfs_fs_put_super+0x234/0x2b0 fs/xfs/xfs_super.c:1098
generic_shutdown_super+0x136/0x2c0 fs/super.c:475
kill_block_super+0x7a/0xe0 fs/super.c:1405
deactivate_locked_super+0xa0/0x110 fs/super.c:335
cleanup_mnt+0x44e/0x500 fs/namespace.c:1143
task_work_run+0x129/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f737ee92eb7
RSP: 002b:00007ffd6bdf77f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f737ee92eb7
RDX: 00007ffd6bdf78b9 RSI: 000000000000000a RDI: 00007ffd6bdf78b0
RBP: 00007ffd6bdf78b0 R08: 00000000ffffffff R09: 00007ffd6bdf7690
R10: 0000555556504653 R11: 0000000000000202 R12: 00007ffd6bdf8920
R13: 00005555565045f0 R14: 00007ffd6bdf7820 R15: 0000000000000003
</TASK>
INFO: task syz-executor293:3562 blocked for more than 143 seconds.
Not tainted 5.15.110-syzkaller #0
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5026 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6372
schedule+0x11b/0x1f0 kernel/sched/core.c:6455
rwsem_down_write_slowpath+0xebb/0x15c0 kernel/locking/rwsem.c:1157
unregister_shrinker+0x60/0x320 mm/vmscan.c:678
xfs_free_buftarg+0x12/0x60 fs/xfs/xfs_buf.c:1889
xfs_close_devices+0x181/0x1b0 fs/xfs/xfs_super.c:390
xfs_fs_put_super+0x234/0x2b0 fs/xfs/xfs_super.c:1098
generic_shutdown_super+0x136/0x2c0 fs/super.c:475
kill_block_super+0x7a/0xe0 fs/super.c:1405
deactivate_locked_super+0xa0/0x110 fs/super.c:335
cleanup_mnt+0x44e/0x500 fs/namespace.c:1143
task_work_run+0x129/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f737ee92eb7
RSP: 002b:00007ffd6bdf77f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f737ee92eb7
RDX: 00007ffd6bdf78b9 RSI: 000000000000000a RDI: 00007ffd6bdf78b0
RBP: 00007ffd6bdf78b0 R08: 00000000ffffffff R09: 00007ffd6bdf7690
R10: 0000555556504653 R11: 0000000000000202 R12: 00007ffd6bdf8920
R13: 00005555565045f0 R14: 00007ffd6bdf7820 R15: 0000000000000003
</TASK>
INFO: task syz-executor293:3694 blocked for more than 144 seconds.
Not tainted 5.15.110-syzkaller #0
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5026 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6372
schedule+0x11b/0x1f0 kernel/sched/core.c:6455
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6514
__mutex_lock_common+0xe34/0x25a0 kernel/locking/mutex.c:669
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
xfs_qm_dqfree_one+0x66/0x170 fs/xfs/xfs_qm.c:1607
xfs_qm_shrink_scan+0x314/0x3d0 fs/xfs/xfs_qm.c:523
do_shrink_slab+0x542/0xda0 mm/vmscan.c:758
shrink_slab+0x233/0x960 mm/vmscan.c:918
drop_slab_node+0xed/0x180 mm/vmscan.c:953
drop_slab+0x8b/0x120 mm/vmscan.c:963
drop_caches_sysctl_handler+0xb3/0x160 fs/drop_caches.c:66
proc_sys_call_handler+0x541/0x8a0 fs/proc/proc_sysctl.c:587
do_iter_readv_writev+0x594/0x7a0
do_iter_write+0x1ea/0x760 fs/read_write.c:855
iter_file_splice_write+0x806/0xfa0 fs/splice.c:689
do_splice_from fs/splice.c:767 [inline]
direct_splice_actor+0xe3/0x1c0 fs/splice.c:936
splice_direct_to_actor+0x500/0xc10 fs/splice.c:891
do_splice_direct+0x285/0x3d0 fs/splice.c:979
do_sendfile+0x625/0xff0 fs/read_write.c:1249
__do_sys_sendfile64 fs/read_write.c:1311 [inline]
__se_sys_sendfile64+0xfc/0x1e0 fs/read_write.c:1303
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f737ee91b19
RSP: 002b:00007ffd6bdf88e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00000000000f35f4 RCX: 00007f737ee91b19
RDX: 0000000020002080 RSI: 0000000000000004 RDI: 0000000000000005
RBP: 0000000000000000 R08: 00007ffd6bdf8910 R09: 00007ffd6bdf8910
R10: 0000000000000875 R11: 0000000000000246 R12: 00007ffd6bdf890c
R13: 00007ffd6bdf8940 R14: 00007ffd6bdf8920 R15: 0000000000000002
</TASK>
INFO: task syz-executor293:3696 blocked for more than 144 seconds.
Not tainted 5.15.110-syzkaller #0
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5026 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6372
schedule+0x11b/0x1f0 kernel/sched/core.c:6455
schedule_timeout+0xac/0x300 kernel/time/timer.c:1860
do_wait_for_common+0x2d9/0x480 kernel/sched/completion.c:85
xfs_buf_iowait+0xb4/0x400 fs/xfs/xfs_buf.c:1573
xfs_buf_delwri_pushbuf+0x2cf/0x4b0 fs/xfs/xfs_buf.c:2251
xfs_qm_flush_one+0x266/0x350 fs/xfs/xfs_qm.c:1249
xfs_qm_dquot_walk+0x22a/0x4a0 fs/xfs/xfs_qm.c:86
xfs_qm_quotacheck+0x2f7/0x640 fs/xfs/xfs_qm.c:1335
xfs_qm_mount_quotas+0x328/0x610 fs/xfs/xfs_qm.c:1441
xfs_mountfs+0x162b/0x1ca0 fs/xfs/xfs_mount.c:904
xfs_fs_fill_super+0x100c/0x1240 fs/xfs/xfs_super.c:1658
get_tree_bdev+0x3fe/0x620 fs/super.c:1303
vfs_get_tree+0x88/0x270 fs/super.c:1508
do_new_mount+0x28b/0xad0 fs/namespace.c:2994
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f737ee92f7a
RSP: 002b:00007ffd6bdf8758 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00646975756f6e2c RCX: 00007f737ee92f7a
RDX: 0000000020009700 RSI: 0000000020009740 RDI: 00007ffd6bdf8770
RBP: 00007ffd6bdf8770 R08: 00007ffd6bdf87b0 R09: 00000000000096c5
R10: 0000000002000000 R11: 0000000000000206 R12: 0000000000000004
R13: 00005555565032c0 R14: 0000000002000000 R15: 00007ffd6bdf87b0
</TASK>
INFO: task syz-executor293:3746 blocked for more than 144 seconds.
Not tainted 5.15.110-syzkaller #0
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5026 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6372
schedule+0x11b/0x1f0 kernel/sched/core.c:6455
rwsem_down_write_slowpath+0xebb/0x15c0 kernel/locking/rwsem.c:1157
prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
prealloc_shrinker+0x92/0x7c0 mm/vmscan.c:620
alloc_super+0x757/0x940 fs/super.c:270
sget_fc+0x21e/0x630 fs/super.c:541
get_tree_bdev+0x26b/0x620 fs/super.c:1273
vfs_get_tree+0x88/0x270 fs/super.c:1508
do_new_mount+0x28b/0xad0 fs/namespace.c:2994
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f737ee92f7a
RSP: 002b:00007ffd6bdf8758 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00646975756f6e2c RCX: 00007f737ee92f7a
RDX: 0000000020009700 RSI: 0000000020009740 RDI: 00007ffd6bdf8770
RBP: 00007ffd6bdf8770 R08: 00007ffd6bdf87b0 R09: 00000000000096c5
R10: 0000000002000000 R11: 0000000000000206 R12: 0000000000000004
R13: 00005555565032c0 R14: 0000000002000000 R15: 00007ffd6bdf87b0
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8c91c4e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
1 lock held by klogd/2950:
#0: ffff8880b9b39698 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
2 locks held by getty/3258:
#0: ffff88814b344098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc900024a42e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1da0 drivers/tty/n_tty.c:2147
2 locks held by syz-executor293/3557:
#0: ffff88801fa4e0e0 (&type->s_umount_key#44){++++}-{3:3}, at: deactivate_super+0xa9/0xe0 fs/super.c:365
#1: ffffffff8c9b9eb0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x60/0x320 mm/vmscan.c:678
2 locks held by syz-executor293/3559:
#0: ffff88801f9fa0e0 (&type->s_umount_key#44){++++}-{3:3}, at: deactivate_super+0xa9/0xe0 fs/super.c:365
#1: ffffffff8c9b9eb0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x60/0x320 mm/vmscan.c:678
2 locks held by syz-executor293/3562:
#0: ffff88801f3600e0 (&type->s_umount_key#44){++++}-{3:3}, at: deactivate_super+0xa9/0xe0 fs/super.c:365
#1: ffffffff8c9b9eb0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x60/0x320 mm/vmscan.c:678
3 locks held by syz-executor293/3694:
#0: ffff888023ed8460 (sb_writers#4){.+.+}-{0:0}, at: do_sendfile+0x600/0xff0 fs/read_write.c:1248
#1: ffffffff8c9b9eb0 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0x125/0x960 mm/vmscan.c:908
#2: ffff88801a7ae158 (&qinf->qi_tree_lock){+.+.}-{3:3}, at: xfs_qm_dqfree_one+0x66/0x170 fs/xfs/xfs_qm.c:1607
3 locks held by syz-executor293/3696:
#0: ffff888022b740e0 (&type->s_umount_key#42/1){+.+.}-{3:3}, at: alloc_super+0x210/0x940 fs/super.c:229
#1: ffff88801a7ae158 (&qinf->qi_tree_lock){+.+.}-{3:3}, at: xfs_qm_dquot_walk+0x132/0x4a0 fs/xfs/xfs_qm.c:73
#2: ffff888079d78f38 (&dqp->q_qlock){+.+.}-{3:3}, at: xfs_dqlock fs/xfs/xfs_dquot.h:133 [inline]
#2: ffff888079d78f38 (&dqp->q_qlock){+.+.}-{3:3}, at: xfs_qm_flush_one+0xca/0x350 fs/xfs/xfs_qm.c:1225
3 locks held by syz-executor293/3746:
#0: ffff888017f35888 (&bdev->bd_fsfreeze_mutex){+.+.}-{3:3}, at: get_tree_bdev+0x197/0x620 fs/super.c:1263
#1: ffff8880772740e0 (&type->s_umount_key#42/1){+.+.}-{3:3}, at: alloc_super+0x210/0x940 fs/super.c:229
#2: ffffffff8c9b9eb0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
#2: ffffffff8c9b9eb0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0x92/0x7c0 mm/vmscan.c:620
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.110-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
watchdog+0xe72/0xeb0 kernel/hung_task.c:295
kthread+0x3f6/0x4f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:109 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x10f/0x340 drivers/acpi/processor_idle.c:570
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
HEAD commit: 8a7f2a5c5aa1 Linux 5.15.110
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=168d655fc80000
kernel config: https://syzkaller.appspot.com/x/.config?x=ba8d5c9d6c5289f
dashboard link: https://syzkaller.appspot.com/bug?extid=1b34f7e6ce4bb2610b77
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16cc5330280000
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=131f05d8280000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fc04f54c047f/disk-8a7f2a5c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6b4ba4cb1191/vmlinux-8a7f2a5c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d927dc3f9670/bzImage-8a7f2a5c.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/57a80301d4ec/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1b34f7...@syzkaller.appspotmail.com
Not tainted 5.15.110-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor293 state:D stack:24696 pid: 3557 ppid: 3556 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5026 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6372
schedule+0x11b/0x1f0 kernel/sched/core.c:6455
rwsem_down_write_slowpath+0xebb/0x15c0 kernel/locking/rwsem.c:1157
__down_write_common kernel/locking/rwsem.c:1284 [inline]
__down_write kernel/locking/rwsem.c:1293 [inline]
down_write+0x164/0x170 kernel/locking/rwsem.c:1542
__down_write kernel/locking/rwsem.c:1293 [inline]
unregister_shrinker+0x60/0x320 mm/vmscan.c:678
xfs_free_buftarg+0x12/0x60 fs/xfs/xfs_buf.c:1889
xfs_close_devices+0x181/0x1b0 fs/xfs/xfs_super.c:390
xfs_fs_put_super+0x234/0x2b0 fs/xfs/xfs_super.c:1098
generic_shutdown_super+0x136/0x2c0 fs/super.c:475
kill_block_super+0x7a/0xe0 fs/super.c:1405
deactivate_locked_super+0xa0/0x110 fs/super.c:335
cleanup_mnt+0x44e/0x500 fs/namespace.c:1143
task_work_run+0x129/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f737ee92eb7
RSP: 002b:00007ffd6bdf77f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f737ee92eb7
RDX: 00007ffd6bdf78b9 RSI: 000000000000000a RDI: 00007ffd6bdf78b0
RBP: 00007ffd6bdf78b0 R08: 00000000ffffffff R09: 00007ffd6bdf7690
R10: 0000555556504653 R11: 0000000000000202 R12: 00007ffd6bdf8920
R13: 00005555565045f0 R14: 00007ffd6bdf7820 R15: 0000000000000003
</TASK>
INFO: task syz-executor293:3559 blocked for more than 143 seconds.
Not tainted 5.15.110-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor293 state:D stack:25472 pid: 3559 ppid: 3556 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5026 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6372
schedule+0x11b/0x1f0 kernel/sched/core.c:6455
rwsem_down_write_slowpath+0xebb/0x15c0 kernel/locking/rwsem.c:1157
__down_write_common kernel/locking/rwsem.c:1284 [inline]
__down_write kernel/locking/rwsem.c:1293 [inline]
down_write+0x164/0x170 kernel/locking/rwsem.c:1542
__down_write kernel/locking/rwsem.c:1293 [inline]
unregister_shrinker+0x60/0x320 mm/vmscan.c:678
xfs_free_buftarg+0x12/0x60 fs/xfs/xfs_buf.c:1889
xfs_close_devices+0x181/0x1b0 fs/xfs/xfs_super.c:390
xfs_fs_put_super+0x234/0x2b0 fs/xfs/xfs_super.c:1098
generic_shutdown_super+0x136/0x2c0 fs/super.c:475
kill_block_super+0x7a/0xe0 fs/super.c:1405
deactivate_locked_super+0xa0/0x110 fs/super.c:335
cleanup_mnt+0x44e/0x500 fs/namespace.c:1143
task_work_run+0x129/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f737ee92eb7
RSP: 002b:00007ffd6bdf77f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f737ee92eb7
RDX: 00007ffd6bdf78b9 RSI: 000000000000000a RDI: 00007ffd6bdf78b0
RBP: 00007ffd6bdf78b0 R08: 00000000ffffffff R09: 00007ffd6bdf7690
R10: 0000555556504653 R11: 0000000000000202 R12: 00007ffd6bdf8920
R13: 00005555565045f0 R14: 00007ffd6bdf7820 R15: 0000000000000003
</TASK>
INFO: task syz-executor293:3562 blocked for more than 143 seconds.
Not tainted 5.15.110-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor293 state:D stack:25696 pid: 3562 ppid: 3556 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5026 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6372
schedule+0x11b/0x1f0 kernel/sched/core.c:6455
rwsem_down_write_slowpath+0xebb/0x15c0 kernel/locking/rwsem.c:1157
__down_write_common kernel/locking/rwsem.c:1284 [inline]
__down_write kernel/locking/rwsem.c:1293 [inline]
down_write+0x164/0x170 kernel/locking/rwsem.c:1542
__down_write kernel/locking/rwsem.c:1293 [inline]
unregister_shrinker+0x60/0x320 mm/vmscan.c:678
xfs_free_buftarg+0x12/0x60 fs/xfs/xfs_buf.c:1889
xfs_close_devices+0x181/0x1b0 fs/xfs/xfs_super.c:390
xfs_fs_put_super+0x234/0x2b0 fs/xfs/xfs_super.c:1098
generic_shutdown_super+0x136/0x2c0 fs/super.c:475
kill_block_super+0x7a/0xe0 fs/super.c:1405
deactivate_locked_super+0xa0/0x110 fs/super.c:335
cleanup_mnt+0x44e/0x500 fs/namespace.c:1143
task_work_run+0x129/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f737ee92eb7
RSP: 002b:00007ffd6bdf77f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f737ee92eb7
RDX: 00007ffd6bdf78b9 RSI: 000000000000000a RDI: 00007ffd6bdf78b0
RBP: 00007ffd6bdf78b0 R08: 00000000ffffffff R09: 00007ffd6bdf7690
R10: 0000555556504653 R11: 0000000000000202 R12: 00007ffd6bdf8920
R13: 00005555565045f0 R14: 00007ffd6bdf7820 R15: 0000000000000003
</TASK>
INFO: task syz-executor293:3694 blocked for more than 144 seconds.
Not tainted 5.15.110-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor293 state:D stack:22496 pid: 3694 ppid: 3560 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5026 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6372
schedule+0x11b/0x1f0 kernel/sched/core.c:6455
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6514
__mutex_lock_common+0xe34/0x25a0 kernel/locking/mutex.c:669
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
xfs_qm_dqfree_one+0x66/0x170 fs/xfs/xfs_qm.c:1607
xfs_qm_shrink_scan+0x314/0x3d0 fs/xfs/xfs_qm.c:523
do_shrink_slab+0x542/0xda0 mm/vmscan.c:758
shrink_slab+0x233/0x960 mm/vmscan.c:918
drop_slab_node+0xed/0x180 mm/vmscan.c:953
drop_slab+0x8b/0x120 mm/vmscan.c:963
drop_caches_sysctl_handler+0xb3/0x160 fs/drop_caches.c:66
proc_sys_call_handler+0x541/0x8a0 fs/proc/proc_sysctl.c:587
do_iter_readv_writev+0x594/0x7a0
do_iter_write+0x1ea/0x760 fs/read_write.c:855
iter_file_splice_write+0x806/0xfa0 fs/splice.c:689
do_splice_from fs/splice.c:767 [inline]
direct_splice_actor+0xe3/0x1c0 fs/splice.c:936
splice_direct_to_actor+0x500/0xc10 fs/splice.c:891
do_splice_direct+0x285/0x3d0 fs/splice.c:979
do_sendfile+0x625/0xff0 fs/read_write.c:1249
__do_sys_sendfile64 fs/read_write.c:1311 [inline]
__se_sys_sendfile64+0xfc/0x1e0 fs/read_write.c:1303
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f737ee91b19
RSP: 002b:00007ffd6bdf88e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00000000000f35f4 RCX: 00007f737ee91b19
RDX: 0000000020002080 RSI: 0000000000000004 RDI: 0000000000000005
RBP: 0000000000000000 R08: 00007ffd6bdf8910 R09: 00007ffd6bdf8910
R10: 0000000000000875 R11: 0000000000000246 R12: 00007ffd6bdf890c
R13: 00007ffd6bdf8940 R14: 00007ffd6bdf8920 R15: 0000000000000002
</TASK>
INFO: task syz-executor293:3696 blocked for more than 144 seconds.
Not tainted 5.15.110-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor293 state:D stack:23584 pid: 3696 ppid: 3558 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5026 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6372
schedule+0x11b/0x1f0 kernel/sched/core.c:6455
schedule_timeout+0xac/0x300 kernel/time/timer.c:1860
do_wait_for_common+0x2d9/0x480 kernel/sched/completion.c:85
__wait_for_common kernel/sched/completion.c:106 [inline]
wait_for_common kernel/sched/completion.c:117 [inline]
wait_for_completion+0x48/0x60 kernel/sched/completion.c:138
wait_for_common kernel/sched/completion.c:117 [inline]
xfs_buf_iowait+0xb4/0x400 fs/xfs/xfs_buf.c:1573
xfs_buf_delwri_pushbuf+0x2cf/0x4b0 fs/xfs/xfs_buf.c:2251
xfs_qm_flush_one+0x266/0x350 fs/xfs/xfs_qm.c:1249
xfs_qm_dquot_walk+0x22a/0x4a0 fs/xfs/xfs_qm.c:86
xfs_qm_quotacheck+0x2f7/0x640 fs/xfs/xfs_qm.c:1335
xfs_qm_mount_quotas+0x328/0x610 fs/xfs/xfs_qm.c:1441
xfs_mountfs+0x162b/0x1ca0 fs/xfs/xfs_mount.c:904
xfs_fs_fill_super+0x100c/0x1240 fs/xfs/xfs_super.c:1658
get_tree_bdev+0x3fe/0x620 fs/super.c:1303
vfs_get_tree+0x88/0x270 fs/super.c:1508
do_new_mount+0x28b/0xad0 fs/namespace.c:2994
do_mount fs/namespace.c:3337 [inline]
__do_sys_mount fs/namespace.c:3545 [inline]
__se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3522
__do_sys_mount fs/namespace.c:3545 [inline]
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f737ee92f7a
RSP: 002b:00007ffd6bdf8758 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00646975756f6e2c RCX: 00007f737ee92f7a
RDX: 0000000020009700 RSI: 0000000020009740 RDI: 00007ffd6bdf8770
RBP: 00007ffd6bdf8770 R08: 00007ffd6bdf87b0 R09: 00000000000096c5
R10: 0000000002000000 R11: 0000000000000206 R12: 0000000000000004
R13: 00005555565032c0 R14: 0000000002000000 R15: 00007ffd6bdf87b0
</TASK>
INFO: task syz-executor293:3746 blocked for more than 144 seconds.
Not tainted 5.15.110-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor293 state:D stack:25560 pid: 3746 ppid: 3561 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5026 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6372
schedule+0x11b/0x1f0 kernel/sched/core.c:6455
rwsem_down_write_slowpath+0xebb/0x15c0 kernel/locking/rwsem.c:1157
__down_write_common kernel/locking/rwsem.c:1284 [inline]
__down_write kernel/locking/rwsem.c:1293 [inline]
down_write+0x164/0x170 kernel/locking/rwsem.c:1542
__down_write kernel/locking/rwsem.c:1293 [inline]
prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
prealloc_shrinker+0x92/0x7c0 mm/vmscan.c:620
alloc_super+0x757/0x940 fs/super.c:270
sget_fc+0x21e/0x630 fs/super.c:541
get_tree_bdev+0x26b/0x620 fs/super.c:1273
vfs_get_tree+0x88/0x270 fs/super.c:1508
do_new_mount+0x28b/0xad0 fs/namespace.c:2994
do_mount fs/namespace.c:3337 [inline]
__do_sys_mount fs/namespace.c:3545 [inline]
__se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3522
__do_sys_mount fs/namespace.c:3545 [inline]
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f737ee92f7a
RSP: 002b:00007ffd6bdf8758 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00646975756f6e2c RCX: 00007f737ee92f7a
RDX: 0000000020009700 RSI: 0000000020009740 RDI: 00007ffd6bdf8770
RBP: 00007ffd6bdf8770 R08: 00007ffd6bdf87b0 R09: 00000000000096c5
R10: 0000000002000000 R11: 0000000000000206 R12: 0000000000000004
R13: 00005555565032c0 R14: 0000000002000000 R15: 00007ffd6bdf87b0
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/27:
1 lock held by klogd/2950:
#0: ffff8880b9b39698 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
2 locks held by getty/3258:
#0: ffff88814b344098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc900024a42e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1da0 drivers/tty/n_tty.c:2147
2 locks held by syz-executor293/3557:
#0: ffff88801fa4e0e0 (&type->s_umount_key#44){++++}-{3:3}, at: deactivate_super+0xa9/0xe0 fs/super.c:365
#1: ffffffff8c9b9eb0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x60/0x320 mm/vmscan.c:678
2 locks held by syz-executor293/3559:
#0: ffff88801f9fa0e0 (&type->s_umount_key#44){++++}-{3:3}, at: deactivate_super+0xa9/0xe0 fs/super.c:365
#1: ffffffff8c9b9eb0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x60/0x320 mm/vmscan.c:678
2 locks held by syz-executor293/3562:
#0: ffff88801f3600e0 (&type->s_umount_key#44){++++}-{3:3}, at: deactivate_super+0xa9/0xe0 fs/super.c:365
#1: ffffffff8c9b9eb0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x60/0x320 mm/vmscan.c:678
3 locks held by syz-executor293/3694:
#0: ffff888023ed8460 (sb_writers#4){.+.+}-{0:0}, at: do_sendfile+0x600/0xff0 fs/read_write.c:1248
#1: ffffffff8c9b9eb0 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0x125/0x960 mm/vmscan.c:908
#2: ffff88801a7ae158 (&qinf->qi_tree_lock){+.+.}-{3:3}, at: xfs_qm_dqfree_one+0x66/0x170 fs/xfs/xfs_qm.c:1607
3 locks held by syz-executor293/3696:
#0: ffff888022b740e0 (&type->s_umount_key#42/1){+.+.}-{3:3}, at: alloc_super+0x210/0x940 fs/super.c:229
#1: ffff88801a7ae158 (&qinf->qi_tree_lock){+.+.}-{3:3}, at: xfs_qm_dquot_walk+0x132/0x4a0 fs/xfs/xfs_qm.c:73
#2: ffff888079d78f38 (&dqp->q_qlock){+.+.}-{3:3}, at: xfs_dqlock fs/xfs/xfs_dquot.h:133 [inline]
#2: ffff888079d78f38 (&dqp->q_qlock){+.+.}-{3:3}, at: xfs_qm_flush_one+0xca/0x350 fs/xfs/xfs_qm.c:1225
3 locks held by syz-executor293/3746:
#0: ffff888017f35888 (&bdev->bd_fsfreeze_mutex){+.+.}-{3:3}, at: get_tree_bdev+0x197/0x620 fs/super.c:1263
#1: ffff8880772740e0 (&type->s_umount_key#42/1){+.+.}-{3:3}, at: alloc_super+0x210/0x940 fs/super.c:229
#2: ffffffff8c9b9eb0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
#2: ffffffff8c9b9eb0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0x92/0x7c0 mm/vmscan.c:620
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.110-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
watchdog+0xe72/0xeb0 kernel/hung_task.c:295
kthread+0x3f6/0x4f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:109 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x10f/0x340 drivers/acpi/processor_idle.c:570
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
syzbot
Sep 24, 2023, 3:05:14 PM9/24/23
to syzkaller...@googlegroups.com
syzbot suspects this issue could be fixed by backporting the following commit:
commit 3c480531a4b1652561fd16824c16be8b8a3ba8f1
git tree: upstream
Author: Evan Quan <evan...@amd.com>
Date: Wed Aug 3 08:46:47 2022 +0000
drm/amd/pm: enable gfxoff feature for SMU 13.0.0
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=121c9afa680000
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
commit 3c480531a4b1652561fd16824c16be8b8a3ba8f1
git tree: upstream
Author: Evan Quan <evan...@amd.com>
Date: Wed Aug 3 08:46:47 2022 +0000
drm/amd/pm: enable gfxoff feature for SMU 13.0.0
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=121c9afa680000
kernel config: https://syzkaller.appspot.com/x/.config?x=ba8d5c9d6c5289f
dashboard link: https://syzkaller.appspot.com/bug?extid=1b34f7e6ce4bb2610b77
dashboard link: https://syzkaller.appspot.com/bug?extid=1b34f7e6ce4bb2610b77
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16cc5330280000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=131f05d8280000
Please keep in mind that other backports might be required as well.
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=131f05d8280000
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
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