[v6.1] INFO: task hung in uevent_show

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syzbot

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Jul 26, 2024, 2:22:23 AM7/26/24

to syzkaller...@googlegroups.com

Hello,

syzbot found the following issue on:

HEAD commit: c18e82d3ee44 Linux 6.1.101
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=10d29cbd980000
kernel config: https://syzkaller.appspot.com/x/.config?x=46d1a7a8110625db
dashboard link: https://syzkaller.appspot.com/bug?extid=dbbadbd69d16b5b8f605
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/78271d3818f2/disk-c18e82d3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8b7c8f740950/vmlinux-c18e82d3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d3542200bb03/bzImage-c18e82d3.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dbbadb...@syzkaller.appspotmail.com

INFO: task udevd:3625 blocked for more than 143 seconds.
Not tainted 6.1.101-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:24600 pid:3625 ppid:3091 flags:0x00004002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6561
schedule+0xbf/0x180 kernel/sched/core.c:6637
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6696
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
device_lock include/linux/device.h:837 [inline]
uevent_show+0x176/0x330 drivers/base/core.c:2661
dev_attr_show+0x50/0xb0 drivers/base/core.c:2364
sysfs_kf_seq_show+0x32d/0x4b0 fs/sysfs/file.c:59
seq_read_iter+0x43a/0xd10 fs/seq_file.c:230
call_read_iter include/linux/fs.h:2259 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x88d/0xbf0 fs/read_write.c:470
ksys_read+0x19c/0x2c0 fs/read_write.c:613
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f349ff16b6a
RSP: 002b:00007ffe53a38438 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 000055d77633cb40 RCX: 00007f349ff16b6a
RDX: 0000000000001000 RSI: 000055d776359610 RDI: 0000000000000008
RBP: 000055d77633cb40 R08: 0000000000000008 R09: 0000000000000010
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000003fff R14: 00007ffe53a38918 R15: 000000000000000a
</TASK>
INFO: task kworker/1:4:3681 blocked for more than 143 seconds.
Not tainted 6.1.101-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:4 state:D stack:23872 pid:3681 ppid:2 flags:0x00004000
Workqueue: events rfkill_global_led_trigger_worker
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6561
schedule+0xbf/0x180 kernel/sched/core.c:6637
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6696
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
rfkill_global_led_trigger_worker+0x23/0xd0 net/rfkill/core.c:181
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
INFO: task kworker/1:6:3695 blocked for more than 143 seconds.
Not tainted 6.1.101-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:6 state:D stack:23384 pid:3695 ppid:2 flags:0x00004000
Workqueue: events rfkill_sync_work
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6561
schedule+0xbf/0x180 kernel/sched/core.c:6637
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6696
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
device_lock include/linux/device.h:837 [inline]
nfc_dev_down net/nfc/core.c:143 [inline]
nfc_rfkill_set_block+0x4c/0x2f0 net/nfc/core.c:179
rfkill_set_block+0x1e7/0x430 net/rfkill/core.c:345
rfkill_sync_work+0x8a/0xe0 net/rfkill/core.c:1042
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
INFO: task kworker/u4:8:3809 blocked for more than 144 seconds.
Not tainted 6.1.101-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:8 state:D stack:21120 pid:3809 ppid:2 flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6561
schedule+0xbf/0x180 kernel/sched/core.c:6637
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6696
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
rfkill_unregister+0xcc/0x220 net/rfkill/core.c:1130
wiphy_unregister+0x223/0xb10 net/wireless/core.c:1089
ieee80211_unregister_hw+0x1b8/0x290 net/mac80211/main.c:1497
mac80211_hwsim_del_radio+0x2be/0x4a0 drivers/net/wireless/mac80211_hwsim.c:4683
hwsim_exit_net+0x5b8/0x660 drivers/net/wireless/mac80211_hwsim.c:5470
ops_exit_list net/core/net_namespace.c:172 [inline]
cleanup_net+0x6ce/0xb60 net/core/net_namespace.c:604
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
INFO: task syz-executor:4193 blocked for more than 144 seconds.
Not tainted 6.1.101-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:20920 pid:4193 ppid:1 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6561
schedule+0xbf/0x180 kernel/sched/core.c:6637
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6696
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
rfkill_unregister+0xcc/0x220 net/rfkill/core.c:1130
hci_unregister_dev+0x362/0x500 net/bluetooth/hci_core.c:2721
vhci_release+0x7f/0xd0 drivers/bluetooth/hci_vhci.c:573
__fput+0x3f6/0x8d0 fs/file_table.c:320
task_work_run+0x246/0x300 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0xa73/0x26a0 kernel/exit.c:871
do_group_exit+0x202/0x2b0 kernel/exit.c:1021
get_signal+0x16f7/0x17d0 kernel/signal.c:2862
arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd401f76b91
RSP: 002b:00007ffc46e3afb0 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: fffffffffffffffc RBX: 00007fd401fe4784 RCX: 00007fd401f76b91
RDX: 0000000000090800 RSI: 00007ffc46e3c1c0 RDI: 00000000ffffff9c
RBP: 00007ffc46e3c1c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000287 R12: 00007ffc46e3c1c0
R13: 00007fd401fe4784 R14: 000000000001965d R15: 00007ffc46e40550
</TASK>
INFO: task syz-executor:4300 blocked for more than 144 seconds.
Not tainted 6.1.101-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21720 pid:4300 ppid:1 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6561
schedule+0xbf/0x180 kernel/sched/core.c:6637
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6696
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
rfkill_unregister+0xcc/0x220 net/rfkill/core.c:1130
hci_unregister_dev+0x362/0x500 net/bluetooth/hci_core.c:2721
vhci_release+0x7f/0xd0 drivers/bluetooth/hci_vhci.c:573
__fput+0x3f6/0x8d0 fs/file_table.c:320
task_work_run+0x246/0x300 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0xa73/0x26a0 kernel/exit.c:871
do_group_exit+0x202/0x2b0 kernel/exit.c:1021
get_signal+0x16f7/0x17d0 kernel/signal.c:2862
arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1f1db76b91
RSP: 002b:00007ffd3fb2fef0 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: fffffffffffffffc RBX: 00007f1f1dbe4784 RCX: 00007f1f1db76b91
RDX: 0000000000090800 RSI: 00007ffd3fb31100 RDI: 00000000ffffff9c
RBP: 00007ffd3fb31100 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000287 R12: 00007ffd3fb31100
R13: 00007f1f1dbe4784 R14: 000000000001a1b1 R15: 00007ffd3fb35490
</TASK>
INFO: task syz-executor:4840 blocked for more than 145 seconds.
Not tainted 6.1.101-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21592 pid:4840 ppid:1 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6561
schedule+0xbf/0x180 kernel/sched/core.c:6637
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6696
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
rfkill_fop_open+0x130/0x680 net/rfkill/core.c:1163
misc_open+0x304/0x380 drivers/char/misc.c:143
chrdev_open+0x54a/0x630 fs/char_dev.c:414
do_dentry_open+0x7f9/0x10f0 fs/open.c:882
do_open fs/namei.c:3628 [inline]
path_openat+0x2644/0x2e60 fs/namei.c:3785
do_filp_open+0x230/0x480 fs/namei.c:3812
do_sys_openat2+0x13b/0x4f0 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]
__x64_sys_openat+0x243/0x290 fs/open.c:1345
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff684b75cd0
RSP: 002b:00007fff89ea1190 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007ff684b75cd0
RDX: 0000000000000002 RSI: 00007ff684be5179 RDI: 00000000ffffff9c
RBP: 00007ff684be5179 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 000000000000000c
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000009
</TASK>
INFO: task syz.4.331:4860 blocked for more than 145 seconds.
Not tainted 6.1.101-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.331 state:D stack:25832 pid:4860 ppid:3634 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6561
schedule+0xbf/0x180 kernel/sched/core.c:6637
schedule_timeout+0xac/0x300 kernel/time/timer.c:1941
do_wait_for_common kernel/sched/completion.c:85 [inline]
__wait_for_common kernel/sched/completion.c:106 [inline]
wait_for_common kernel/sched/completion.c:117 [inline]
wait_for_completion+0x350/0x610 kernel/sched/completion.c:138
__flush_work+0x95b/0xad0 kernel/workqueue.c:3076
__cancel_work_timer+0x519/0x6a0 kernel/workqueue.c:3163
rfkill_unregister+0x92/0x220 net/rfkill/core.c:1124
nfc_unregister_device+0x92/0x290 net/nfc/core.c:1167
virtual_ncidev_close+0x55/0x90 drivers/nfc/virtual_ncidev.c:170
__fput+0x3f6/0x8d0 fs/file_table.c:320
task_work_run+0x246/0x300 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5bc9f77299
RSP: 002b:00007ffca5004d68 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000001c1c7 RCX: 00007f5bc9f77299
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007ffca5004e40 R08: 0000000000000001 R09: 00007ffca500504f
R10: 00007f5bc9c00000 R11: 0000000000000246 R12: 0000000000000032
R13: 00007ffca5004e60 R14: 00007ffca5004e80 R15: ffffffffffffffff
</TASK>
INFO: task syz-executor:4868 blocked for more than 145 seconds.
Not tainted 6.1.101-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:26272 pid:4868 ppid:1 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6561
schedule+0xbf/0x180 kernel/sched/core.c:6637
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6696
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
rfkill_register+0x30/0x880 net/rfkill/core.c:1057
hci_register_dev+0x4df/0xa40 net/bluetooth/hci_core.c:2621
__vhci_create_device drivers/bluetooth/hci_vhci.c:340 [inline]
vhci_create_device+0x3ba/0x700 drivers/bluetooth/hci_vhci.c:379
vhci_get_user drivers/bluetooth/hci_vhci.c:436 [inline]
vhci_write+0x38b/0x440 drivers/bluetooth/hci_vhci.c:516
call_write_iter include/linux/fs.h:2265 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x857/0xbc0 fs/read_write.c:584
ksys_write+0x19c/0x2c0 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fba01575de0
RSP: 002b:00007ffd81e39978 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fba01575de0
RDX: 0000000000000002 RSI: 00007ffd81e3998a RDI: 00000000000000ca
RBP: 00007fba01706a38 R08: 0000000000000000 R09: 00007fba0223d6c0
R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000c
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000009
</TASK>
INFO: task syz-executor:4936 blocked for more than 145 seconds.
Not tainted 6.1.101-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:26808 pid:4936 ppid:1 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6561
schedule+0xbf/0x180 kernel/sched/core.c:6637
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6696
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
rfkill_register+0x30/0x880 net/rfkill/core.c:1057
hci_register_dev+0x4df/0xa40 net/bluetooth/hci_core.c:2621
__vhci_create_device drivers/bluetooth/hci_vhci.c:340 [inline]
vhci_create_device+0x3ba/0x700 drivers/bluetooth/hci_vhci.c:379
vhci_get_user drivers/bluetooth/hci_vhci.c:436 [inline]
vhci_write+0x38b/0x440 drivers/bluetooth/hci_vhci.c:516
call_write_iter include/linux/fs.h:2265 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x857/0xbc0 fs/read_write.c:584
ksys_write+0x19c/0x2c0 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd1ac975de0
RSP: 002b:00007ffef2440738 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fd1ac975de0
RDX: 0000000000000002 RSI: 00007ffef244074a RDI: 00000000000000ca
RBP: 00007fd1acb06a38 R08: 0000000000000000 R09: 00007fd1ad63d6c0
R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000c
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000009
</TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8d32af10 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8d32b710 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516
1 lock held by khungtaskd/27:
#0: ffffffff8d32ad40 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8d32ad40 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8d32ad40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6494
2 locks held by getty/3390:
#0: ffff88814bcd0098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc900031262f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a7/0x1db0 drivers/tty/n_tty.c:2198
4 locks held by udevd/3625:
#0: ffff88807a92bc30 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xae/0xd10 fs/seq_file.c:182
#1: ffff8880782ac488 (&of->mutex){+.+.}-{3:3}, at: kernfs_seq_start+0x4f/0x3a0 fs/kernfs/file.c:150
#2: ffff888061e03830 (kn->active#5){.+.+}-{0:0}, at: kernfs_seq_start+0x6e/0x3a0 fs/kernfs/file.c:151
#3: ffff8880182f1100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline]
#3: ffff8880182f1100 (&dev->mutex){....}-{3:3}, at: uevent_show+0x176/0x330 drivers/base/core.c:2661
2 locks held by kworker/u4:5/3663:
#0: ffff8880b983aa18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537
#1: ffffc900041bfd20 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
3 locks held by kworker/1:4/3681:
#0: ffff888012870938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#1: ffffc9000462fd20 ((work_completion)(&rfkill_global_led_trigger_work)){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#2: ffffffff8e7a6b68 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_global_led_trigger_worker+0x23/0xd0 net/rfkill/core.c:181
4 locks held by kworker/1:6/3695:
#0: ffff888012870938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#1: ffffc900046bfd20 ((work_completion)(&rfkill->sync_work)){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#2: ffffffff8e7a6b68 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_sync_work+0x25/0xe0 net/rfkill/core.c:1040
#3: ffff8880182f1100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline]
#3: ffff8880182f1100 (&dev->mutex){....}-{3:3}, at: nfc_dev_down net/nfc/core.c:143 [inline]
#3: ffff8880182f1100 (&dev->mutex){....}-{3:3}, at: nfc_rfkill_set_block+0x4c/0x2f0 net/nfc/core.c:179
4 locks held by kworker/u4:8/3809:
#0: ffff888012a1e938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#1: ffffc90004ab7d20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#2: ffffffff8e4eb2d0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf1/0xb60 net/core/net_namespace.c:566
#3: ffffffff8e7a6b68 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_unregister+0xcc/0x220 net/rfkill/core.c:1130
1 lock held by syz-executor/4193:
#0: ffffffff8e7a6b68 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_unregister+0xcc/0x220 net/rfkill/core.c:1130
1 lock held by syz-executor/4300:
#0: ffffffff8e7a6b68 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_unregister+0xcc/0x220 net/rfkill/core.c:1130
2 locks held by syz-executor/4840:
#0: ffffffff8da7df68 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
#1: ffffffff8e7a6b68 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_open+0x130/0x680 net/rfkill/core.c:1163
1 lock held by syz.4.331/4860:
#0: ffff8880182f1100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline]
#0: ffff8880182f1100 (&dev->mutex){....}-{3:3}, at: nfc_unregister_device+0x5f/0x290 net/nfc/core.c:1165
2 locks held by syz-executor/4868:
#0: ffff888076ed2118 (&data->open_mutex){+.+.}-{3:3}, at: vhci_create_device+0x34/0x700 drivers/bluetooth/hci_vhci.c:378
#1: ffffffff8e7a6b68 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_register+0x30/0x880 net/rfkill/core.c:1057
2 locks held by syz-executor/4936:
#0: ffff88807baa0118 (&data->open_mutex){+.+.}-{3:3}, at: vhci_create_device+0x34/0x700 drivers/bluetooth/hci_vhci.c:378
#1: ffffffff8e7a6b68 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_register+0x30/0x880 net/rfkill/core.c:1057
1 lock held by syz.1.341/4961:
#0: ffffffff8da7df68 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/4964:
#0: ffffffff8da7df68 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/4966:
#0: ffffffff8da7df68 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/4968:
#0: ffffffff8da7df68 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/4970:
#0: ffffffff8da7df68 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/4972:
#0: ffffffff8da7df68 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/4974:
#0: ffffffff8da7df68 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/4976:
#0: ffffffff8da7df68 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/4982:
#0: ffffffff8da7df68 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/4984:
#0: ffffffff8da7df68 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/4986:
#0: ffffffff8da7df68 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/4988:
#0: ffffffff8da7df68 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/4990:
#0: ffffffff8da7df68 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 6.1.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1b0/0x3f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xf88/0xfd0 kernel/hung_task.c:377
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3663 Comm: kworker/u4:5 Not tainted 6.1.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Workqueue: bat_events batadv_nc_worker
RIP: 0010:lockdep_hardirqs_on_prepare+0x1c3/0x7a0 kernel/locking/lockdep.c:4312
Code: 48 c1 e8 03 80 3c 10 00 74 0f e8 58 ee 77 00 48 ba 00 00 00 00 00 fc ff df 4c 89 7c 24 18 48 8b 44 24 10 4c 8b b0 d0 0a 00 00 <48> 8d b8 b8 0a 00 00 48 89 f8 48 c1 e8 03 80 3c 10 00 74 05 e8 a4
RSP: 0018:ffffc900041bf9e0 EFLAGS: 00000046
RAX: ffff888029a4bb80 RBX: 1ffff92000837f44 RCX: ffffffff91f31103
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff888029a4c650
RBP: ffffc900041bfa88 R08: dffffc0000000000 R09: ffffed1003173369
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 1ffff92000837f5c R14: b15501e3e8b737c3 R15: 1ffff92000837f40
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561517ba0048 CR3: 000000000d08e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
trace_hardirqs_on+0x34/0x40 kernel/trace/trace_preemptirq.c:49
__local_bh_enable_ip+0x164/0x1f0 kernel/softirq.c:401
spin_unlock_bh include/linux/spinlock.h:396 [inline]
batadv_nc_purge_paths+0x30e/0x3b0 net/batman-adv/network-coding.c:471
batadv_nc_worker+0x361/0x610 net/batman-adv/network-coding.c:722
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>

---
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.

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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:
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(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup

syzbot

unread,

Nov 26, 2024, 9:33:37 PM11/26/24

to syzkaller...@googlegroups.com

syzbot has found a reproducer for the following issue on:

HEAD commit: e4d90d63d385 Linux 6.1.119
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=17184dc0580000
kernel config: https://syzkaller.appspot.com/x/.config?x=5516a02be29a5649

dashboard link: https://syzkaller.appspot.com/bug?extid=dbbadbd69d16b5b8f605
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111cb778580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/19f991f20183/disk-e4d90d63.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/61eb5f055f38/vmlinux-e4d90d63.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0ddd97416681/bzImage-e4d90d63.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dbbadb...@syzkaller.appspotmail.com

INFO: task udevd:3622 blocked for more than 143 seconds.
Not tainted 6.1.119-syzkaller #0

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

task:udevd state:D stack:23360 pid:3622 ppid:1 flags:0x00004002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5241 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693

__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
device_lock include/linux/device.h:837 [inline]
uevent_show+0x176/0x330 drivers/base/core.c:2661
dev_attr_show+0x50/0xb0 drivers/base/core.c:2364
sysfs_kf_seq_show+0x32d/0x4b0 fs/sysfs/file.c:59
seq_read_iter+0x43a/0xd10 fs/seq_file.c:230
call_read_iter include/linux/fs.h:2259 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x88d/0xbf0 fs/read_write.c:470
ksys_read+0x19c/0x2c0 fs/read_write.c:613
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

RIP: 0033:0x7f0eb8516b6a
RSP: 002b:00007ffcb4551198 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000564697ecfac0 RCX: 00007f0eb8516b6a
RDX: 0000000000001000 RSI: 0000564697ed63a0 RDI: 000000000000000c
RBP: 0000564697ecfac0 R08: 000000000000000c R09: 0000000000000000

R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000

R13: 0000000000003fff R14: 00007ffcb4551678 R15: 000000000000000a
</TASK>
INFO: task dhcpcd:3916 blocked for more than 143 seconds.
Not tainted 6.1.119-syzkaller #0

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

task:dhcpcd state:D stack:24248 pid:3916 ppid:1 flags:0x00004002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5241 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693

__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747

genl_lock net/netlink/genetlink.c:33 [inline]
genl_rcv_msg+0x125/0xf70 net/netlink/genetlink.c:848
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2493
genl_rcv+0x24/0x40 net/netlink/genetlink.c:861
netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
netlink_unicast+0x7d8/0x970 net/netlink/af_netlink.c:1337
netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1859
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:730 [inline]
____sys_sendmsg+0x5a5/0x8f0 net/socket.c:2519
___sys_sendmsg net/socket.c:2573 [inline]
__sys_sendmsg+0x2a9/0x390 net/socket.c:2602

do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

RIP: 0033:0x7ff496f6ba4b
RSP: 002b:00007ffc7e59aa98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00005605a4cd094f RCX: 00007ff496f6ba4b
RDX: 0000000000000000 RSI: 00007ffc7e59aae0 RDI: 0000000000000010
RBP: 00007ffc7e5aefa8 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffc7e5af1f0 R11: 0000000000000246 R12: 0000000000000010
R13: 00007ffc7e59eb40 R14: 0000000000000000 R15: 00005605db4411b0
</TASK>
INFO: task kworker/u4:6:4498 blocked for more than 143 seconds.
Not tainted 6.1.119-syzkaller #0

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

task:kworker/u4:6 state:D stack:25664 pid:4498 ppid:2 flags:0x00004000
Workqueue: nfc2_nci_cmd_wq nci_cmd_work
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5241 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693

__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747

virtual_nci_send+0x1c/0xd0 drivers/nfc/virtual_ncidev.c:54
nci_cmd_work+0xa4/0x2a0 net/nfc/nci/core.c:1589

process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>

INFO: task syz-executor:14262 blocked for more than 144 seconds.
Not tainted 6.1.119-syzkaller #0

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

task:syz-executor state:D stack:21736 pid:14262 ppid:1 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5241 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693

__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747

genl_lock net/netlink/genetlink.c:33 [inline]
genl_rcv_msg+0x125/0xf70 net/netlink/genetlink.c:848
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2493
genl_rcv+0x24/0x40 net/netlink/genetlink.c:861
netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
netlink_unicast+0x7d8/0x970 net/netlink/af_netlink.c:1337
netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1859
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:730 [inline]
__sys_sendto+0x480/0x600 net/socket.c:2153
__do_sys_sendto net/socket.c:2165 [inline]
__se_sys_sendto net/socket.c:2161 [inline]
__x64_sys_sendto+0xda/0xf0 net/socket.c:2161

do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

RIP: 0033:0x7f7475f807ac
RSP: 002b:00007ffdd5cdf490 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f7476c64620 RCX: 00007f7475f807ac
RDX: 0000000000000020 RSI: 00007f7476c64670 RDI: 0000000000000005
RBP: 0000000000000000 R08: 00007ffdd5cdf4e4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000005
R13: 00007ffdd5cdf538 R14: 00007f7476c64670 R15: 0000000000000000
</TASK>
INFO: task syz.2.3015:14386 blocked for more than 144 seconds.
Not tainted 6.1.119-syzkaller #0

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

task:syz.2.3015 state:D stack:27560 pid:14386 ppid:4379 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5241 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693

__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747

misc_open+0x58/0x380 drivers/char/misc.c:107

chrdev_open+0x54a/0x630 fs/char_dev.c:414
do_dentry_open+0x7f9/0x10f0 fs/open.c:882

do_open fs/namei.c:3626 [inline]
path_openat+0x2644/0x2e60 fs/namei.c:3783
do_filp_open+0x230/0x480 fs/namei.c:3810

do_sys_openat2+0x13b/0x4f0 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]
__x64_sys_openat+0x243/0x290 fs/open.c:1345
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

RIP: 0033:0x7f08e0b7e919
RSP: 002b:00007f08e199e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f08e0d35fa0 RCX: 00007f08e0b7e919
RDX: 0000000000000002 RSI: 0000000020000080 RDI: ffffffffffffff9c
RBP: 00007f08e0bf197e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f08e0d35fa0 R15: 00007ffdb38335e8
</TASK>
INFO: task syz.2.3015:14396 blocked for more than 144 seconds.
Not tainted 6.1.119-syzkaller #0

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

task:syz.2.3015 state:D stack:25600 pid:14396 ppid:4379 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5241 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693

__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747

virtual_nci_close+0x13/0x40 drivers/nfc/virtual_ncidev.c:44
nci_open_device net/nfc/nci/core.c:544 [inline]
nci_dev_up+0x954/0xd40 net/nfc/nci/core.c:631
nfc_dev_up+0x185/0x330 net/nfc/core.c:118
nfc_genl_dev_up+0x80/0xd0 net/nfc/netlink.c:770
genl_family_rcv_msg_doit net/netlink/genetlink.c:756 [inline]
genl_family_rcv_msg net/netlink/genetlink.c:833 [inline]
genl_rcv_msg+0xc1a/0xf70 net/netlink/genetlink.c:850
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2493
genl_rcv+0x24/0x40 net/netlink/genetlink.c:861
netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
netlink_unicast+0x7d8/0x970 net/netlink/af_netlink.c:1337
netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1859
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:730 [inline]
____sys_sendmsg+0x5a5/0x8f0 net/socket.c:2519
___sys_sendmsg net/socket.c:2573 [inline]
__sys_sendmsg+0x2a9/0x390 net/socket.c:2602

do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

RIP: 0033:0x7f08e0b7e919
RSP: 002b:00007f08e197d038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f08e0d36080 RCX: 00007f08e0b7e919
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000005
RBP: 00007f08e0bf197e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f08e0d36080 R15: 00007ffdb38335e8
</TASK>
INFO: task syz.4.3018:14388 blocked for more than 145 seconds.
Not tainted 6.1.119-syzkaller #0

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

task:syz.4.3018 state:D stack:24088 pid:14388 ppid:4385 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5241 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693

__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
device_lock include/linux/device.h:837 [inline]

nfc_register_device+0x98/0x310 net/nfc/core.c:1128
nci_register_device+0x7be/0x900 net/nfc/nci/core.c:1265
virtual_ncidev_open+0x55/0xc0 drivers/nfc/virtual_ncidev.c:150

misc_open+0x304/0x380 drivers/char/misc.c:143
chrdev_open+0x54a/0x630 fs/char_dev.c:414
do_dentry_open+0x7f9/0x10f0 fs/open.c:882

do_open fs/namei.c:3626 [inline]
path_openat+0x2644/0x2e60 fs/namei.c:3783
do_filp_open+0x230/0x480 fs/namei.c:3810

RIP: 0033:0x7fd25bd7e919
RSP: 002b:00007fd25cbeb038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fd25bf35fa0 RCX: 00007fd25bd7e919
RDX: 0000000000000002 RSI: 0000000020000080 RDI: ffffffffffffff9c
RBP: 00007fd25bdf197e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd25bf35fa0 R15: 00007fffaebadbd8
</TASK>
INFO: task syz.4.3018:14395 blocked for more than 145 seconds.
Not tainted 6.1.119-syzkaller #0

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

task:syz.4.3018 state:D stack:27272 pid:14395 ppid:4385 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5241 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693

__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747

genl_lock net/netlink/genetlink.c:33 [inline]
genl_rcv_msg+0x125/0xf70 net/netlink/genetlink.c:848
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2493
genl_rcv+0x24/0x40 net/netlink/genetlink.c:861
netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
netlink_unicast+0x7d8/0x970 net/netlink/af_netlink.c:1337
netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1859
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:730 [inline]
__sys_sendto+0x480/0x600 net/socket.c:2153
__do_sys_sendto net/socket.c:2165 [inline]
__se_sys_sendto net/socket.c:2161 [inline]
__x64_sys_sendto+0xda/0xf0 net/socket.c:2161

do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

RIP: 0033:0x7fd25bd807ac
RSP: 002b:00007fd25cbc8ec0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fd25cbc8fc0 RCX: 00007fd25bd807ac
RDX: 000000000000001c RSI: 00007fd25cbc9010 RDI: 0000000000000006
RBP: 0000000000000000 R08: 00007fd25cbc8f14 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000006
R13: 00007fd25cbc8f68 R14: 00007fd25cbc9010 R15: 0000000000000000
</TASK>
INFO: task syz.1.3017:14393 blocked for more than 145 seconds.
Not tainted 6.1.119-syzkaller #0

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

task:syz.1.3017 state:D stack:27560 pid:14393 ppid:4376 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5241 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693

__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747

misc_open+0x58/0x380 drivers/char/misc.c:107

chrdev_open+0x54a/0x630 fs/char_dev.c:414
do_dentry_open+0x7f9/0x10f0 fs/open.c:882

do_open fs/namei.c:3626 [inline]
path_openat+0x2644/0x2e60 fs/namei.c:3783
do_filp_open+0x230/0x480 fs/namei.c:3810

RIP: 0033:0x7f8efdb7e919
RSP: 002b:00007f8efe94c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f8efdd35fa0 RCX: 00007f8efdb7e919
RDX: 0000000000000002 RSI: 0000000020000080 RDI: ffffffffffffff9c
RBP: 00007f8efdbf197e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8efdd35fa0 R15: 00007fff23c15558
</TASK>
INFO: task syz.1.3017:14398 blocked for more than 145 seconds.
Not tainted 6.1.119-syzkaller #0

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

task:syz.1.3017 state:D stack:27272 pid:14398 ppid:4376 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5241 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693

__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747

genl_lock net/netlink/genetlink.c:33 [inline]
genl_rcv_msg+0x125/0xf70 net/netlink/genetlink.c:848
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2493
genl_rcv+0x24/0x40 net/netlink/genetlink.c:861
netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
netlink_unicast+0x7d8/0x970 net/netlink/af_netlink.c:1337
netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1859
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:730 [inline]
__sys_sendto+0x480/0x600 net/socket.c:2153
__do_sys_sendto net/socket.c:2165 [inline]
__se_sys_sendto net/socket.c:2161 [inline]
__x64_sys_sendto+0xda/0xf0 net/socket.c:2161

do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

RIP: 0033:0x7f8efdb807ac
RSP: 002b:00007f8efe929ec0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f8efe929fc0 RCX: 00007f8efdb807ac
RDX: 000000000000001c RSI: 00007f8efe92a010 RDI: 0000000000000006
RBP: 0000000000000000 R08: 00007f8efe929f14 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000006
R13: 00007f8efe929f68 R14: 00007f8efe92a010 R15: 0000000000000000

</TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:

#0: ffffffff8d32b110 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:517

1 lock held by rcu_tasks_trace/13:

#0: ffffffff8d32b910 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:517

1 lock held by khungtaskd/27:

#0: ffffffff8d32af40 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8d32af40 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8d32af40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6510
4 locks held by udevd/3622:
#0: ffff8880755c2c30 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xae/0xd10 fs/seq_file.c:182
#1: ffff888028557488 (&of->mutex){+.+.}-{3:3}, at: kernfs_seq_start+0x4f/0x3a0 fs/kernfs/file.c:154
#2: ffff888030a8bae8 (kn->active#5){++++}-{0:0}, at: kernfs_seq_start+0x6e/0x3a0 fs/kernfs/file.c:155
#3: ffff888078dd9100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline]
#3: ffff888078dd9100 (&dev->mutex){....}-{3:3}, at: uevent_show+0x176/0x330 drivers/base/core.c:2661
2 locks held by dhcpcd/3916:
#0: ffffffff8e569790 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:860
#1: ffffffff8e569648 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline]
#1: ffffffff8e569648 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x125/0xf70 net/netlink/genetlink.c:848
2 locks held by getty/4012:
#0: ffff888030d23098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc9000325e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a7/0x1db0 drivers/tty/n_tty.c:2198
3 locks held by kworker/u4:6/4498:
#0: ffff888058521938 ((wq_completion)nfc2_nci_cmd_wq){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#1: ffffc90003577d20 ((work_completion)(&ndev->cmd_work)){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#2: ffffffff8dbec9a8 (nci_mutex){+.+.}-{3:3}, at: virtual_nci_send+0x1c/0xd0 drivers/nfc/virtual_ncidev.c:54
2 locks held by syz-executor/14262:
#0: ffffffff8e569790 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:860
#1: ffffffff8e569648 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline]
#1: ffffffff8e569648 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x125/0xf70 net/netlink/genetlink.c:848
1 lock held by syz.2.3015/14386:
#0: ffffffff8da902a8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
5 locks held by syz.2.3015/14396:
#0: ffffffff8e569790 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:860
#1: ffffffff8e569648 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline]
#1: ffffffff8e569648 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x125/0xf70 net/netlink/genetlink.c:848
#2: ffff888078dd9100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline]
#2: ffff888078dd9100 (&dev->mutex){....}-{3:3}, at: nfc_dev_up+0x3b/0x330 net/nfc/core.c:95
#3: ffff888078ddc350 (&ndev->req_lock){+.+.}-{3:3}, at: nci_open_device net/nfc/nci/core.c:477 [inline]
#3: ffff888078ddc350 (&ndev->req_lock){+.+.}-{3:3}, at: nci_dev_up+0xa0/0xd40 net/nfc/nci/core.c:631
#4: ffffffff8dbec9a8 (nci_mutex){+.+.}-{3:3}, at: virtual_nci_close+0x13/0x40 drivers/nfc/virtual_ncidev.c:44
3 locks held by syz.4.3018/14388:
#0: ffffffff8da902a8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
#1: ffffffff8dbec9a8 (nci_mutex){+.+.}-{3:3}, at: virtual_ncidev_open+0x15/0xc0 drivers/nfc/virtual_ncidev.c:137
#2: ffff888078dd9100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline]
#2: ffff888078dd9100 (&dev->mutex){....}-{3:3}, at: nfc_register_device+0x98/0x310 net/nfc/core.c:1128
2 locks held by syz.4.3018/14395:
#0: ffffffff8e569790 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:860
#1: ffffffff8e569648 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline]
#1: ffffffff8e569648 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x125/0xf70 net/netlink/genetlink.c:848
1 lock held by syz.1.3017/14393:
#0: ffffffff8da902a8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
2 locks held by syz.1.3017/14398:
#0: ffffffff8e569790 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:860
#1: ffffffff8e569648 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline]
#1: ffffffff8e569648 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x125/0xf70 net/netlink/genetlink.c:848
1 lock held by syz.3.3016/14394:
#0: ffffffff8da902a8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
2 locks held by syz.3.3016/14401:
#0: ffffffff8e569790 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:860
#1: ffffffff8e569648 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline]
#1: ffffffff8e569648 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x125/0xf70 net/netlink/genetlink.c:848
1 lock held by syz-executor/14418:
#0: ffffffff8da902a8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/14421:
#0: ffffffff8da902a8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/14422:
#0: ffffffff8da902a8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/14423:
#0: ffffffff8da902a8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/14425:
#0: ffffffff8da902a8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/14429:
#0: ffffffff8da902a8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/14431:
#0: ffffffff8da902a8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/14432:
#0: ffffffff8da902a8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/14433:
#0: ffffffff8da902a8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/14435:
#0: ffffffff8da902a8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/14440:
#0: ffffffff8da902a8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/14441:
#0: ffffffff8da902a8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/14442:
#0: ffffffff8da902a8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107
1 lock held by syz-executor/14443:
#0: ffffffff8da902a8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x58/0x380 drivers/char/misc.c:107

=============================================

NMI backtrace for cpu 1

CPU: 1 PID: 27 Comm: khungtaskd Not tainted 6.1.119-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024

Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111

nmi_trigger_cpumask_backtrace+0x1ae/0x3f0 lib/nmi_backtrace.c:62

trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xf88/0xfd0 kernel/hung_task.c:377
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0

CPU: 0 PID: 4307 Comm: kworker/u4:4 Not tainted 6.1.119-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: bat_events batadv_nc_worker
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:106 [inline]
RIP: 0010:lock_acquire+0x18d/0x5a0 kernel/locking/lockdep.c:5658
Code: 8d bc 24 80 00 00 00 4c 89 fb 48 c1 eb 03 42 80 3c 2b 00 74 08 4c 89 ff e8 00 83 77 00 48 c7 84 24 80 00 00 00 00 00 00 00 9c <8f> 84 24 80 00 00 00 42 80 3c 2b 00 74 08 4c 89 ff e8 5d 82 77 00
RSP: 0018:ffffc90004007a78 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffff92000800f60 RCX: ffffffff816aa1fb
RDX: 0000000000000000 RSI: ffffffff8b5e61e0 RDI: ffffffff8b5e61a0
RBP: ffffc90004007be0 R08: dffffc0000000000 R09: fffffbfff1d35ef6
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000800f58
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc90004007b00
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007ffc602d49a8 CR3: 00000000304f1000 CR4: 00000000003506f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>

rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
rcu_read_lock include/linux/rcupdate.h:791 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
batadv_nc_worker+0xe8/0x610 net/batman-adv/network-coding.c:719

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.

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Jun 1, 2025, 9:17:31 PMJun 1

to syzkaller...@googlegroups.com

syzbot has found a reproducer for the following issue on:

HEAD commit: da3c5173c55f Linux 6.1.140
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1796cc82580000
kernel config: https://syzkaller.appspot.com/x/.config?x=46e5b914cae7bc26
dashboard link: https://syzkaller.appspot.com/bug?extid=dbbadbd69d16b5b8f605
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1300b970580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10d9700c580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f64777e3df5f/disk-da3c5173.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/86760acf06d3/vmlinux-da3c5173.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4b53296c1a0a/bzImage-da3c5173.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dbbadb...@syzkaller.appspotmail.com

INFO: task udevd:4278 blocked for more than 143 seconds.
Not tainted 6.1.140-syzkaller #0

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

task:udevd state:D stack:27360 pid:4278 ppid:3624 flags:0x00004002

Call Trace:
<TASK>
context_switch kernel/sched/core.c:5244 [inline]

__schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637

schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6696
__mutex_lock_common kernel/locking/mutex.c:679 [inline]

__mutex_lock+0x555/0xaf0 kernel/locking/mutex.c:747
device_lock include/linux/device.h:837 [inline]
uevent_show+0x16c/0x320 drivers/base/core.c:2669
dev_attr_show+0x50/0xb0 drivers/base/core.c:2372
sysfs_kf_seq_show+0x349/0x4b0 fs/sysfs/file.c:59
seq_read_iter+0x49b/0xd50 fs/seq_file.c:230

call_read_iter include/linux/fs.h:2259 [inline]
new_sync_read fs/read_write.c:389 [inline]

vfs_read+0x434/0x920 fs/read_write.c:470
ksys_read+0x143/0x240 fs/read_write.c:613
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1eb46a7407
RSP: 002b:00007ffcb8928f00 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f1eb4d85880 RCX: 00007f1eb46a7407
RDX: 0000000000001000 RSI: 0000558a545e09b0 RDI: 0000000000000008
RBP: 00007f1eb47efff0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000a
R13: 00007f1eb47efea0 R14: 0000000000000000 R15: 0000558a545e73e0

</TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:

#0: ffffffff8c92b4b0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517

1 lock held by rcu_tasks_trace/13:

#0: ffffffff8c92bcd0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
5 locks held by kworker/1:1/26:
1 lock held by khungtaskd/28:
#0: ffffffff8c92ab20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8c92ab20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8c92ab20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513
2 locks held by getty/4015:
#0: ffff88807dde0098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc9000325e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41b/0x1380 drivers/tty/n_tty.c:2198
4 locks held by udevd/4278:
#0: ffff888079c2cd58 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xad/0xd50 fs/seq_file.c:182
#1: ffff88801af0a888 (&of->mutex){+.+.}-{3:3}, at: kernfs_seq_start+0x51/0x3b0 fs/kernfs/file.c:154
#2: ffff888145e79a00 (kn->active#5){.+.+}-{0:0}, at: kernfs_seq_start+0x71/0x3b0 fs/kernfs/file.c:155
#3: ffff8881437c3190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline]
#3: ffff8881437c3190 (&dev->mutex){....}-{3:3}, at: uevent_show+0x16c/0x320 drivers/base/core.c:2669
2 locks held by dhcpcd/4293:
#0: ffff88801caac130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1756 [inline]
#0: ffff88801caac130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xce0 net/packet/af_packet.c:3249
#1: ffffffff8c9307f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
#1: ffffffff8c9307f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x455/0x830 kernel/rcu/tree_exp.h:962
2 locks held by dhcpcd/4295:
#0: ffff88801cab0130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1756 [inline]
#0: ffff88801cab0130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xce0 net/packet/af_packet.c:3249
#1: ffffffff8c9307f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:323 [inline]
#1: ffffffff8c9307f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x346/0x830 kernel/rcu/tree_exp.h:962
1 lock held by dhcpcd/4296:
#0: ffff88802ab16130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1756 [inline]
#0: ffff88802ab16130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xce0 net/packet/af_packet.c:3249
1 lock held by dhcpcd/4297:
#0: ffff8880247d6130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1756 [inline]
#0: ffff8880247d6130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xce0 net/packet/af_packet.c:3249
1 lock held by dhcpcd/4309:
#0: ffff888024ff6130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1756 [inline]
#0: ffff888024ff6130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xce0 net/packet/af_packet.c:3249
1 lock held by dhcpcd/4310:
#0: ffff888024ff4130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1756 [inline]
#0: ffff888024ff4130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xce0 net/packet/af_packet.c:3249

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.1.140-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
<TASK>
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
nmi_cpu_backtrace+0x3f4/0x470 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62

trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]

watchdog+0xeee/0xf30 kernel/hung_task.c:377
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Sending NMI from CPU 0 to CPUs 1:

NMI backtrace for cpu 1

CPU: 1 PID: 26 Comm: kworker/1:1 Not tainted 6.1.140-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:pvclock_clocksource_read+0x46/0x760 arch/x86/kernel/pvclock.c:68
Code: 1c 4c 8d 57 10 4c 8d 5f 03 48 89 fa 48 c1 ea 03 4d 89 de 49 c1 ee 03 49 8d 48 07 4c 89 c0 48 c1 e8 03 48 89 84 24 90 00 00 00 <48> 89 4c 24 50 48 c1 e9 03 48 89 8c 24 88 00 00 00 49 8d 49 03 4c
RSP: 0018:ffffc90000a1e480 EFLAGS: 00000a06
RAX: 1ffffffff1ef9a09 RBX: ffffc90000a1e5a0 RCX: ffffffff8f7cd04f
RDX: 1ffffffff1ef9a08 RSI: ffffffff8f7cd05c RDI: ffffffff8f7cd040
RBP: ffffc90000a1e608 R08: ffffffff8f7cd048 R09: ffffffff8f7cd058
R10: ffffffff8f7cd050 R11: ffffffff8f7cd043 R12: 000000000000001a
R13: dffffc0000000000 R14: 1ffffffff1ef9a08 R15: ffff88801c209988
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007fb52374ec40 CR3: 000000007874a000 CR4: 00000000003506e0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:

<TASK>
kvm_clock_read arch/x86/kernel/kvmclock.c:79 [inline]
kvm_sched_clock_read+0x14/0x40 arch/x86/kernel/kvmclock.c:91
sched_clock_cpu+0x6e/0x250 kernel/sched/clock.c:369
local_clock include/linux/sched/clock.h:84 [inline]
__set_page_owner_handle+0x1a9/0x3c0 mm/page_owner.c:174
__set_page_owner+0x41/0x60 mm/page_owner.c:195
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532
prep_new_page mm/page_alloc.c:2539 [inline]
get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328
__alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5606
alloc_slab_page+0x5d/0x160 mm/slub.c:1794
allocate_slab mm/slub.c:1939 [inline]
new_slab+0x87/0x2c0 mm/slub.c:1992
___slab_alloc+0xbc6/0x1220 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
__kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3437
__do_kmalloc_node mm/slab_common.c:935 [inline]
__kmalloc_node_track_caller+0x9e/0x230 mm/slab_common.c:956
kmalloc_reserve net/core/skbuff.c:446 [inline]
__alloc_skb+0x22a/0x7e0 net/core/skbuff.c:515
__netdev_alloc_skb+0x107/0x4d0 net/core/skbuff.c:579
netdev_alloc_skb include/linux/skbuff.h:3206 [inline]
dev_alloc_skb include/linux/skbuff.h:3219 [inline]
ath6kl_usb_post_recv_transfers+0x207/0x6f0 drivers/net/wireless/ath/ath6kl/usb.c:428
ath6kl_usb_start_recv_pipes drivers/net/wireless/ath/ath6kl/usb.c:498 [inline]
hif_start drivers/net/wireless/ath/ath6kl/usb.c:703 [inline]
ath6kl_usb_power_on+0x66/0x280 drivers/net/wireless/ath/ath6kl/usb.c:1062
ath6kl_hif_power_on drivers/net/wireless/ath/ath6kl/hif-ops.h:136 [inline]
ath6kl_core_init+0x1ce/0x10c0 drivers/net/wireless/ath/ath6kl/core.c:97
ath6kl_usb_probe+0x144a/0x1540 drivers/net/wireless/ath/ath6kl/usb.c:1168
usb_probe_interface+0x5a0/0xaf0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2aa/0xc70 drivers/base/dd.c:639
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:785
driver_probe_device+0x4f/0x420 drivers/base/dd.c:815
__device_attach_driver+0x2c6/0x510 drivers/base/dd.c:943
bus_for_each_drv+0x175/0x200 drivers/base/bus.c:429
__device_attach+0x29b/0x460 drivers/base/dd.c:1015
bus_probe_device+0xbc/0x1e0 drivers/base/bus.c:489
device_add+0xa00/0xfb0 drivers/base/core.c:3697
usb_set_configuration+0x1991/0x1fd0 drivers/usb/core/message.c:2165
usb_generic_driver_probe+0x89/0x150 drivers/usb/core/generic.c:238
usb_probe_device+0x139/0x270 drivers/usb/core/driver.c:293
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2aa/0xc70 drivers/base/dd.c:639
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:785
driver_probe_device+0x4f/0x420 drivers/base/dd.c:815
__device_attach_driver+0x2c6/0x510 drivers/base/dd.c:943
bus_for_each_drv+0x175/0x200 drivers/base/bus.c:429
__device_attach+0x29b/0x460 drivers/base/dd.c:1015
bus_probe_device+0xbc/0x1e0 drivers/base/bus.c:489
device_add+0xa00/0xfb0 drivers/base/core.c:3697
usb_new_device+0xd4d/0x1620 drivers/usb/core/hub.c:2631
hub_port_connect drivers/usb/core/hub.c:5489 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5629 [inline]
port_event drivers/usb/core/hub.c:5785 [inline]
hub_event+0x2b02/0x5210 drivers/usb/core/hub.c:5867
process_one_work+0x898/0x1160 kernel/workqueue.c:2292
worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.823 msecs

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