[v6.1] INFO: task hung in rfkill_unregister (2)
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syzbot
Nov 28, 2025, 10:40:30 PM (2 days ago) Nov 28
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: f6e38ae624cf Linux 6.1.158
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1773be92580000
kernel config: https://syzkaller.appspot.com/x/.config?x=68aa5a3af1cb953a
dashboard link: https://syzkaller.appspot.com/bug?extid=50a333b456c2736e51d0
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c1bd671a9def/disk-f6e38ae6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fa0af998ea40/vmlinux-f6e38ae6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e5512d873524/Image-f6e38ae6.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+50a333...@syzkaller.appspotmail.com
INFO: task kworker/u4:6:4413 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:6 state:D stack:0 pid:4413 ppid:2 flags:0x00000008
Workqueue: netns cleanup_net
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
rfkill_unregister+0xb8/0x208 net/rfkill/core.c:1130
wiphy_unregister+0x1e4/0x9fc net/wireless/core.c:1089
ieee80211_unregister_hw+0x194/0x278 net/mac80211/main.c:1504
mac80211_hwsim_del_radio+0x210/0x3a8 drivers/net/wireless/mac80211_hwsim.c:4688
hwsim_exit_net+0x49c/0x558 drivers/net/wireless/mac80211_hwsim.c:5475
ops_exit_list net/core/net_namespace.c:172 [inline]
cleanup_net+0x5c4/0xa74 net/core/net_namespace.c:640
process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292
worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439
kthread+0x250/0x2d8 kernel/kthread.c:376
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
INFO: task kworker/1:16:4562 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:16 state:D stack:0 pid:4562 ppid:2 flags:0x00000008
Workqueue: events rfkill_op_handler
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
device_lock include/linux/device.h:840 [inline]
nfc_dev_down net/nfc/core.c:143 [inline]
nfc_rfkill_set_block+0x4c/0x2a8 net/nfc/core.c:179
rfkill_set_block+0x18c/0x374 net/rfkill/core.c:345
rfkill_epo+0x8c/0x158 net/rfkill/core.c:454
__rfkill_handle_global_op net/rfkill/input.c:60 [inline]
rfkill_op_handler+0x150/0x248 net/rfkill/input.c:108
process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292
worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439
kthread+0x250/0x2d8 kernel/kthread.c:376
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
INFO: task kworker/1:19:4566 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:19 state:D stack:0 pid:4566 ppid:2 flags:0x00000008
Workqueue: events rfkill_global_led_trigger_worker
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
rfkill_global_led_trigger_worker+0x30/0xe4 net/rfkill/core.c:181
process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292
worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439
kthread+0x250/0x2d8 kernel/kthread.c:376
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
INFO: task udevd:4594 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:0 pid:4594 ppid:3937 flags:0x00000004
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
misc_open+0x6c/0x368 drivers/char/misc.c:107
chrdev_open+0x26c/0x4f0 fs/char_dev.c:414
do_dentry_open+0x730/0xfa8 fs/open.c:882
vfs_open+0x7c/0x90 fs/open.c:1013
do_open fs/namei.c:3634 [inline]
path_openat+0x1f48/0x2680 fs/namei.c:3791
do_filp_open+0x174/0x344 fs/namei.c:3818
do_sys_openat2+0x128/0x3d8 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__arm64_sys_openat+0x120/0x154 fs/open.c:1345
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x138 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
INFO: task udevd:4754 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:0 pid:4754 ppid:3937 flags:0x00000004
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
misc_open+0x6c/0x368 drivers/char/misc.c:107
chrdev_open+0x26c/0x4f0 fs/char_dev.c:414
do_dentry_open+0x730/0xfa8 fs/open.c:882
vfs_open+0x7c/0x90 fs/open.c:1013
do_open fs/namei.c:3634 [inline]
path_openat+0x1f48/0x2680 fs/namei.c:3791
do_filp_open+0x174/0x344 fs/namei.c:3818
do_sys_openat2+0x128/0x3d8 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__arm64_sys_openat+0x120/0x154 fs/open.c:1345
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x138 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
INFO: task syz-executor:5053 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:5053 ppid:1 flags:0x00000001
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
rfkill_fop_open+0x110/0x5b0 net/rfkill/core.c:1163
misc_open+0x2f0/0x368 drivers/char/misc.c:143
chrdev_open+0x26c/0x4f0 fs/char_dev.c:414
do_dentry_open+0x730/0xfa8 fs/open.c:882
vfs_open+0x7c/0x90 fs/open.c:1013
do_open fs/namei.c:3634 [inline]
path_openat+0x1f48/0x2680 fs/namei.c:3791
do_filp_open+0x174/0x344 fs/namei.c:3818
do_sys_openat2+0x128/0x3d8 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__arm64_sys_openat+0x120/0x154 fs/open.c:1345
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x138 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
INFO: task syz.4.155:5152 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.155 state:D stack:0 pid:5152 ppid:4333 flags:0x00000009
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
rfkill_unregister+0xb8/0x208 net/rfkill/core.c:1130
nfc_unregister_device+0x94/0x288 net/nfc/core.c:1167
nci_unregister_device+0x1dc/0x21c net/nfc/nci/core.c:1311
virtual_ncidev_close+0x70/0xb0 drivers/nfc/virtual_ncidev.c:170
__fput+0x1bc/0x7c0 fs/file_table.c:320
____fput+0x20/0x30 fs/file_table.c:348
task_work_run+0x1ec/0x270 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
do_notify_resume+0x2038/0x2b28 arch/arm64/kernel/signal.c:1137
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+0x98/0x138 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.2.213:5526 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.213 state:D stack:0 pid:5526 ppid:4328 flags:0x00000001
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
misc_open+0x6c/0x368 drivers/char/misc.c:107
chrdev_open+0x26c/0x4f0 fs/char_dev.c:414
do_dentry_open+0x730/0xfa8 fs/open.c:882
vfs_open+0x7c/0x90 fs/open.c:1013
do_open fs/namei.c:3634 [inline]
path_openat+0x1f48/0x2680 fs/namei.c:3791
do_filp_open+0x174/0x344 fs/namei.c:3818
do_sys_openat2+0x128/0x3d8 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__arm64_sys_openat+0x120/0x154 fs/open.c:1345
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x138 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
INFO: task syz.1.224:5607 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.224 state:D stack:0 pid:5607 ppid:4322 flags:0x00000001
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
misc_open+0x6c/0x368 drivers/char/misc.c:107
chrdev_open+0x26c/0x4f0 fs/char_dev.c:414
do_dentry_open+0x730/0xfa8 fs/open.c:882
vfs_open+0x7c/0x90 fs/open.c:1013
do_open fs/namei.c:3634 [inline]
path_openat+0x1f48/0x2680 fs/namei.c:3791
do_filp_open+0x174/0x344 fs/namei.c:3818
do_sys_openat2+0x128/0x3d8 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__arm64_sys_openat+0x120/0x154 fs/open.c:1345
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x138 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
INFO: task syz.0.227:5624 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.227 state:D stack:0 pid:5624 ppid:4320 flags:0x00000009
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
misc_open+0x6c/0x368 drivers/char/misc.c:107
chrdev_open+0x26c/0x4f0 fs/char_dev.c:414
do_dentry_open+0x730/0xfa8 fs/open.c:882
vfs_open+0x7c/0x90 fs/open.c:1013
do_open fs/namei.c:3634 [inline]
path_openat+0x1f48/0x2680 fs/namei.c:3791
do_filp_open+0x174/0x344 fs/namei.c:3818
do_sys_openat2+0x128/0x3d8 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__arm64_sys_openat+0x120/0x154 fs/open.c:1345
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x138 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: ffff800015297870 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xbb4 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
#0: ffff800015298090 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xbb4 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/28:
#0: ffff800015296f00 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:349
2 locks held by getty/4079:
#0: ffff0000d6aba098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
#1: ffff80002075e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2ec/0xf9c drivers/tty/n_tty.c:2198
4 locks held by kworker/u4:6/4413:
#0: ffff0000c0845138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265
#1: ffff800021307c20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267
#2: ffff800017724910 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x12c/0xa74 net/core/net_namespace.c:594
#3: ffff8000179df8e8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_unregister+0xb8/0x208 net/rfkill/core.c:1130
4 locks held by kworker/1:16/4562:
#0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265
#1: ffff800021677c20 ((rfkill_op_work).work){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267
#2: ffff8000179df8e8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_epo+0x58/0x158 net/rfkill/core.c:450
#3: ffff0000f4e9c100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:840 [inline]
#3: ffff0000f4e9c100 (&dev->mutex){....}-{3:3}, at: nfc_dev_down net/nfc/core.c:143 [inline]
#3: ffff0000f4e9c100 (&dev->mutex){....}-{3:3}, at: nfc_rfkill_set_block+0x4c/0x2a8 net/nfc/core.c:179
3 locks held by kworker/1:19/4566:
#0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265
#1: ffff8000216a7c20 ((work_completion)(&rfkill_global_led_trigger_work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267
#2: ffff8000179df8e8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_global_led_trigger_worker+0x30/0xe4 net/rfkill/core.c:181
1 lock held by udevd/4594:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by udevd/4754:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
2 locks held by syz-executor/5053:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
#1: ffff8000179df8e8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_open+0x110/0x5b0 net/rfkill/core.c:1163
2 locks held by syz.4.155/5152:
#0: ffff0000f4e9c100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:840 [inline]
#0: ffff0000f4e9c100 (&dev->mutex){....}-{3:3}, at: nfc_unregister_device+0x68/0x288 net/nfc/core.c:1165
#1: ffff8000179df8e8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_unregister+0xb8/0x208 net/rfkill/core.c:1130
1 lock held by syz.2.213/5526:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz.1.224/5607:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz.0.227/5624:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5697:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5785:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5789:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5790:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5796:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5802:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5807:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5811:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5812:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5814:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5820:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5822:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5826:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5827:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
=============================================
---
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.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: f6e38ae624cf Linux 6.1.158
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1773be92580000
kernel config: https://syzkaller.appspot.com/x/.config?x=68aa5a3af1cb953a
dashboard link: https://syzkaller.appspot.com/bug?extid=50a333b456c2736e51d0
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c1bd671a9def/disk-f6e38ae6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fa0af998ea40/vmlinux-f6e38ae6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e5512d873524/Image-f6e38ae6.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+50a333...@syzkaller.appspotmail.com
INFO: task kworker/u4:6:4413 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:6 state:D stack:0 pid:4413 ppid:2 flags:0x00000008
Workqueue: netns cleanup_net
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
rfkill_unregister+0xb8/0x208 net/rfkill/core.c:1130
wiphy_unregister+0x1e4/0x9fc net/wireless/core.c:1089
ieee80211_unregister_hw+0x194/0x278 net/mac80211/main.c:1504
mac80211_hwsim_del_radio+0x210/0x3a8 drivers/net/wireless/mac80211_hwsim.c:4688
hwsim_exit_net+0x49c/0x558 drivers/net/wireless/mac80211_hwsim.c:5475
ops_exit_list net/core/net_namespace.c:172 [inline]
cleanup_net+0x5c4/0xa74 net/core/net_namespace.c:640
process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292
worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439
kthread+0x250/0x2d8 kernel/kthread.c:376
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
INFO: task kworker/1:16:4562 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:16 state:D stack:0 pid:4562 ppid:2 flags:0x00000008
Workqueue: events rfkill_op_handler
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
device_lock include/linux/device.h:840 [inline]
nfc_dev_down net/nfc/core.c:143 [inline]
nfc_rfkill_set_block+0x4c/0x2a8 net/nfc/core.c:179
rfkill_set_block+0x18c/0x374 net/rfkill/core.c:345
rfkill_epo+0x8c/0x158 net/rfkill/core.c:454
__rfkill_handle_global_op net/rfkill/input.c:60 [inline]
rfkill_op_handler+0x150/0x248 net/rfkill/input.c:108
process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292
worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439
kthread+0x250/0x2d8 kernel/kthread.c:376
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
INFO: task kworker/1:19:4566 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:19 state:D stack:0 pid:4566 ppid:2 flags:0x00000008
Workqueue: events rfkill_global_led_trigger_worker
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
rfkill_global_led_trigger_worker+0x30/0xe4 net/rfkill/core.c:181
process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292
worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439
kthread+0x250/0x2d8 kernel/kthread.c:376
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
INFO: task udevd:4594 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:0 pid:4594 ppid:3937 flags:0x00000004
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
misc_open+0x6c/0x368 drivers/char/misc.c:107
chrdev_open+0x26c/0x4f0 fs/char_dev.c:414
do_dentry_open+0x730/0xfa8 fs/open.c:882
vfs_open+0x7c/0x90 fs/open.c:1013
do_open fs/namei.c:3634 [inline]
path_openat+0x1f48/0x2680 fs/namei.c:3791
do_filp_open+0x174/0x344 fs/namei.c:3818
do_sys_openat2+0x128/0x3d8 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__arm64_sys_openat+0x120/0x154 fs/open.c:1345
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x138 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
INFO: task udevd:4754 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:0 pid:4754 ppid:3937 flags:0x00000004
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
misc_open+0x6c/0x368 drivers/char/misc.c:107
chrdev_open+0x26c/0x4f0 fs/char_dev.c:414
do_dentry_open+0x730/0xfa8 fs/open.c:882
vfs_open+0x7c/0x90 fs/open.c:1013
do_open fs/namei.c:3634 [inline]
path_openat+0x1f48/0x2680 fs/namei.c:3791
do_filp_open+0x174/0x344 fs/namei.c:3818
do_sys_openat2+0x128/0x3d8 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__arm64_sys_openat+0x120/0x154 fs/open.c:1345
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x138 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
INFO: task syz-executor:5053 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:5053 ppid:1 flags:0x00000001
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
rfkill_fop_open+0x110/0x5b0 net/rfkill/core.c:1163
misc_open+0x2f0/0x368 drivers/char/misc.c:143
chrdev_open+0x26c/0x4f0 fs/char_dev.c:414
do_dentry_open+0x730/0xfa8 fs/open.c:882
vfs_open+0x7c/0x90 fs/open.c:1013
do_open fs/namei.c:3634 [inline]
path_openat+0x1f48/0x2680 fs/namei.c:3791
do_filp_open+0x174/0x344 fs/namei.c:3818
do_sys_openat2+0x128/0x3d8 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__arm64_sys_openat+0x120/0x154 fs/open.c:1345
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x138 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
INFO: task syz.4.155:5152 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.155 state:D stack:0 pid:5152 ppid:4333 flags:0x00000009
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
rfkill_unregister+0xb8/0x208 net/rfkill/core.c:1130
nfc_unregister_device+0x94/0x288 net/nfc/core.c:1167
nci_unregister_device+0x1dc/0x21c net/nfc/nci/core.c:1311
virtual_ncidev_close+0x70/0xb0 drivers/nfc/virtual_ncidev.c:170
__fput+0x1bc/0x7c0 fs/file_table.c:320
____fput+0x20/0x30 fs/file_table.c:348
task_work_run+0x1ec/0x270 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
do_notify_resume+0x2038/0x2b28 arch/arm64/kernel/signal.c:1137
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+0x98/0x138 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.2.213:5526 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.213 state:D stack:0 pid:5526 ppid:4328 flags:0x00000001
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
misc_open+0x6c/0x368 drivers/char/misc.c:107
chrdev_open+0x26c/0x4f0 fs/char_dev.c:414
do_dentry_open+0x730/0xfa8 fs/open.c:882
vfs_open+0x7c/0x90 fs/open.c:1013
do_open fs/namei.c:3634 [inline]
path_openat+0x1f48/0x2680 fs/namei.c:3791
do_filp_open+0x174/0x344 fs/namei.c:3818
do_sys_openat2+0x128/0x3d8 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__arm64_sys_openat+0x120/0x154 fs/open.c:1345
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x138 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
INFO: task syz.1.224:5607 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.224 state:D stack:0 pid:5607 ppid:4322 flags:0x00000001
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
misc_open+0x6c/0x368 drivers/char/misc.c:107
chrdev_open+0x26c/0x4f0 fs/char_dev.c:414
do_dentry_open+0x730/0xfa8 fs/open.c:882
vfs_open+0x7c/0x90 fs/open.c:1013
do_open fs/namei.c:3634 [inline]
path_openat+0x1f48/0x2680 fs/namei.c:3791
do_filp_open+0x174/0x344 fs/namei.c:3818
do_sys_openat2+0x128/0x3d8 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__arm64_sys_openat+0x120/0x154 fs/open.c:1345
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x138 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
INFO: task syz.0.227:5624 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.227 state:D stack:0 pid:5624 ppid:4320 flags:0x00000009
Call trace:
__switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xddc/0x1b18 kernel/sched/core.c:6561
schedule+0xc4/0x170 kernel/sched/core.c:6637
schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696
__mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
misc_open+0x6c/0x368 drivers/char/misc.c:107
chrdev_open+0x26c/0x4f0 fs/char_dev.c:414
do_dentry_open+0x730/0xfa8 fs/open.c:882
vfs_open+0x7c/0x90 fs/open.c:1013
do_open fs/namei.c:3634 [inline]
path_openat+0x1f48/0x2680 fs/namei.c:3791
do_filp_open+0x174/0x344 fs/namei.c:3818
do_sys_openat2+0x128/0x3d8 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__arm64_sys_openat+0x120/0x154 fs/open.c:1345
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x138 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: ffff800015297870 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xbb4 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
#0: ffff800015298090 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xbb4 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/28:
#0: ffff800015296f00 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:349
2 locks held by getty/4079:
#0: ffff0000d6aba098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
#1: ffff80002075e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2ec/0xf9c drivers/tty/n_tty.c:2198
4 locks held by kworker/u4:6/4413:
#0: ffff0000c0845138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265
#1: ffff800021307c20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267
#2: ffff800017724910 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x12c/0xa74 net/core/net_namespace.c:594
#3: ffff8000179df8e8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_unregister+0xb8/0x208 net/rfkill/core.c:1130
4 locks held by kworker/1:16/4562:
#0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265
#1: ffff800021677c20 ((rfkill_op_work).work){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267
#2: ffff8000179df8e8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_epo+0x58/0x158 net/rfkill/core.c:450
#3: ffff0000f4e9c100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:840 [inline]
#3: ffff0000f4e9c100 (&dev->mutex){....}-{3:3}, at: nfc_dev_down net/nfc/core.c:143 [inline]
#3: ffff0000f4e9c100 (&dev->mutex){....}-{3:3}, at: nfc_rfkill_set_block+0x4c/0x2a8 net/nfc/core.c:179
3 locks held by kworker/1:19/4566:
#0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265
#1: ffff8000216a7c20 ((work_completion)(&rfkill_global_led_trigger_work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267
#2: ffff8000179df8e8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_global_led_trigger_worker+0x30/0xe4 net/rfkill/core.c:181
1 lock held by udevd/4594:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by udevd/4754:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
2 locks held by syz-executor/5053:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
#1: ffff8000179df8e8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_open+0x110/0x5b0 net/rfkill/core.c:1163
2 locks held by syz.4.155/5152:
#0: ffff0000f4e9c100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:840 [inline]
#0: ffff0000f4e9c100 (&dev->mutex){....}-{3:3}, at: nfc_unregister_device+0x68/0x288 net/nfc/core.c:1165
#1: ffff8000179df8e8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_unregister+0xb8/0x208 net/rfkill/core.c:1130
1 lock held by syz.2.213/5526:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz.1.224/5607:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz.0.227/5624:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5697:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5785:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5789:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5790:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5796:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5802:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5807:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5811:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5812:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5814:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5820:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5822:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5826:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
1 lock held by syz-executor/5827:
#0: ffff8000164e1728 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x6c/0x368 drivers/char/misc.c:107
=============================================
---
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