INFO: task kworker/1:0:24 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:0 state:D stack:24808 pid:24 tgid:24 ppid:2 task_flags:0x4208060 flags:0x00004000
Workqueue: events p9_write_work
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7058
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115
__mutex_lock_common kernel/locking/mutex.c:676 [inline]
__mutex_lock+0x81b/0x1060 kernel/locking/mutex.c:760
anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
__kernel_write_iter+0x317/0xb10 fs/read_write.c:619
__kernel_write fs/read_write.c:639 [inline]
kernel_write fs/read_write.c:660 [inline]
kernel_write+0x1f4/0x6c0 fs/read_write.c:650
p9_fd_write net/9p/trans_fd.c:434 [inline]
p9_write_work+0x258/0xc10 net/9p/trans_fd.c:485
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3236
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Showing all locks held in the system:
3 locks held by kworker/0:0/9:
#0: ffff88801b878d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3211
#1: ffffc900000e7d10 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3212
#2: ffff888063768068 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
3 locks held by kworker/1:0/24:
#0: ffff88801b878d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3211
#1: ffffc900001e7d10 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3212
#2: ffff88807b6f6468 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
1 lock held by khungtaskd/31:
#0: ffffffff8e5c1220 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e5c1220 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e5c1220 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775
3 locks held by kworker/u8:2/36:
#0: ffff8880b843a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:636
#1: ffff8880b8424088 (psi_seq){-.-.}-{0:0}, at: psi_sched_switch kernel/sched/stats.h:220 [inline]
#1: ffff8880b8424088 (psi_seq){-.-.}-{0:0}, at: __schedule+0x1861/0x5de0 kernel/sched/core.c:6955
#2: ffff8880295b8768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6212 [inline]
#2: ffff8880295b8768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: cfg80211_wiphy_work+0x99/0x580 net/wireless/core.c:421
5 locks held by kworker/u8:3/37:
#0: ffff8880b843a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:636
#1: ffff8880b8424088 (psi_seq){-.-.}-{0:0}, at: psi_sched_switch kernel/sched/stats.h:220 [inline]
#1: ffff8880b8424088 (psi_seq){-.-.}-{0:0}, at: __schedule+0x1861/0x5de0 kernel/sched/core.c:6955
#2: ffff8880b8425b18 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x127/0x1d0 kernel/time/timer.c:1004
#3: ffffffff9b089b08 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x14c/0x4c0 lib/debugobjects.c:818
#4: ffffffff8e5c1220 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8e5c1220 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8e5c1220 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
#4: ffffffff8e5c1220 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xbd/0x20a0 arch/x86/kernel/unwind_orc.c:479
3 locks held by kworker/1:2/978:
#0: ffff88801b878d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3211
#1: ffffc90003967d10 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3212
#2: ffff88802ead4068 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
3 locks held by klogd/5210:
#0: ffff8880b853a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:636
#1: ffffffff8e781e40 (mmu_notifier_invalidate_range_start){+.+.}-{0:0}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:636
#2: ffff88806a72d2a8 (&p->pi_lock){-.-.}-{2:2}, at: class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:557 [inline]
#2: ffff88806a72d2a8 (&p->pi_lock){-.-.}-{2:2}, at: try_to_wake_up+0xb7/0x1870 kernel/sched/core.c:4216
2 locks held by getty/5611:
#0: ffff88803604e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
3 locks held by kworker/0:3/5886:
#0: ffff88801b878d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3211
#1: ffffc9000237fd10 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3212
#2: ffff88806939a068 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
3 locks held by kworker/0:4/5893:
#0: ffff88801b878d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3211
#1: ffffc900041dfd10 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3212
#2: ffff88803528a868 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
3 locks held by kworker/1:3/5993:
#0: ffff88801b878d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3211
#1: ffffc900032c7d10 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3212
#2: ffff88806979f468 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
2 locks held by syz.0.16/6470:
#0: ffff88807b6f6468 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
#1: ffff8880789e02e8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline]
#1: ffff8880789e02e8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_fault+0x61d/0x2930 mm/filemap.c:3452
2 locks held by syz.1.18/6497:
#0: ffff88806939a068 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
#1: ffff8880789e0958 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline]
#1: ffff8880789e0958 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_fault+0x61d/0x2930 mm/filemap.c:3452
2 locks held by syz.2.19/6520:
#0: ffff88803528a868 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
#1: ffff8880789e0fc8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline]
#1: ffff8880789e0fc8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_fault+0x61d/0x2930 mm/filemap.c:3452
3 locks held by kworker/1:5/6521:
#0: ffff88801b878d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3211
#1: ffffc9000213fd10 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3212
#2: ffff888077d0f068 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
2 locks held by syz.3.20/6550:
#0: ffff88806979f468 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
#1: ffff8880789e1638 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline]
#1: ffff8880789e1638 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_fault+0x61d/0x2930 mm/filemap.c:3452
3 locks held by kworker/1:6/6552:
#0: ffff88801b878d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3211
#1: ffffc90003d5fd10 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3212
#2: ffff8880332aac68 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
2 locks held by syz.4.21/6581:
#0: ffff8880332aac68 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
#1: ffff8880789e1ca8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline]
#1: ffff8880789e1ca8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_fault+0x61d/0x2930 mm/filemap.c:3452
2 locks held by syz.5.22/6611:
#0: ffff888063768068 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
#1: ffff8880772502e8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline]
#1: ffff8880772502e8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_fault+0x61d/0x2930 mm/filemap.c:3452
3 locks held by kworker/0:7/6639:
#0: ffff88801b878d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3211
#1: ffffc900042bfd10 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3212
#2: ffff888060bafc68 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
2 locks held by syz.6.23/6641:
#0: ffff888060bafc68 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
#1: ffff8880789e2318 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline]
#1: ffff8880789e2318 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_fault+0x61d/0x2930 mm/filemap.c:3452
2 locks held by syz.7.24/6676:
#0: ffff888077d0f068 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
#1: ffff8880789e2988 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline]
#1: ffff8880789e2988 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_fault+0x61d/0x2930 mm/filemap.c:3452
3 locks held by kworker/1:8/6678:
#0: ffff88801b878d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3211
#1: ffffc900044afd10 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3212
#2: ffff888027d63068 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
2 locks held by syz.8.25/6708:
#0: ffff88802ead4068 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
#1: ffff8880789e2ff8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline]
#1: ffff8880789e2ff8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_fault+0x61d/0x2930 mm/filemap.c:3452
2 locks held by syz.9.26/6738:
#0: ffff888027d63068 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1a90 fs/pipe.c:458
#1: ffff8880789e3668 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline]
#1: ffff8880789e3668 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_fault+0x61d/0x2930 mm/filemap.c:3452
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
watchdog+0xf0e/0x1260 kernel/hung_task.c:491
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 2954 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: bat_events batadv_nc_worker
RIP: 0010:register_lock_class+0x7b/0x4c0 kernel/locking/lockdep.c:1394
Code: 11 83 e5 01 75 0c 41 83 fe 01 75 0a 4c 89 7b 10 eb 04 4c 89 7b 08 8b 15 53 14 4e 19 85 d2 75 0a 45 39 77 58 0f 85 ef 00 00 00 <48> 8b 44 24 30 65 48 2b 05 c0 a3 3e 12 0f 85 1f 04 00 00 48 83 c4
RSP: 0018:ffffc9000bd07aa8 EFLAGS: 00000046
RAX: ffffffff95e36768 RBX: ffffc9000bd07d10 RCX: ffffffff8d116d60
RDX: 0000000000000000 RSI: ffffffff8d116d60 RDI: ffffc9000bd07d10
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 000000009b30bc01
R13: ffff888030a3c880 R14: 0000000000000000 R15: ffffffff95e36768
FS: 0000000000000000(0000) GS:ffff8881247b9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556f5165c8 CR3: 0000000034834000 CR4: 00000000003526f0
Call Trace:
__lock_acquire+0x9f/0x1ce0 kernel/locking/lockdep.c:5112
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
process_one_work+0x932/0x1b70 kernel/workqueue.c:3212
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245