INFO: task syz.6.4970:24099 blocked for more than 144 seconds.
Not tainted 6.15.0-syzkaller-11796-g5abc7438f1e9 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.4970 state:D stack:26168 pid:24099 tgid:24098 ppid:20818 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935
rwsem_down_read_slowpath+0x552/0x880 kernel/locking/rwsem.c:1084
__down_read_common kernel/locking/rwsem.c:1248 [inline]
__down_read kernel/locking/rwsem.c:1261 [inline]
down_read+0x98/0x2e0 kernel/locking/rwsem.c:1526
__super_lock fs/super.c:59 [inline]
super_lock+0x2a9/0x3b0 fs/super.c:121
__iterate_supers+0x126/0x250 fs/super.c:923
quota_sync_all fs/quota/quota.c:69 [inline]
__do_sys_quotactl fs/quota/quota.c:938 [inline]
__se_sys_quotactl+0x353/0x950 fs/quota/quota.c:917
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f69b938e969
RSP: 002b:00007f69ba299038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f69b95b5fa0 RCX: 00007f69b938e969
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000100
RBP: 00007f69b9410ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f69b95b5fa0 R15: 00007ffe2362f498
Showing all locks held in the system:
2 locks held by kworker/u8:1/13:
1 lock held by khungtaskd/31:
#0: ffffffff8e13f060 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13f060 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13f060 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
2 locks held by getty/5590:
#0: ffff88803510a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by syz-executor/10620:
#0: ffff8880207440e0 (&type->s_umount_key#76){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff8880207440e0 (&type->s_umount_key#76){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff8880207440e0 (&type->s_umount_key#76){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:506
6 locks held by kworker/0:1/16241:
#0: ffff888020ea8548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff888020ea8548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3321
#1: ffffc9000476fbc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc9000476fbc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3321
#2: ffff888028184198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline]
#2: ffff888028184198 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4a00 drivers/usb/core/hub.c:5859
#3: ffff88802486b198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline]
#3: ffff88802486b198 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400 drivers/base/dd.c:1004
#4: ffff888069213160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline]
#4: ffff888069213160 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400 drivers/base/dd.c:1004
#5: ffff888069216098 (&hub->status_mutex){+.+.}-{4:4}, at: hub_hub_status+0x38/0x570 drivers/usb/core/hub.c:990
2 locks held by kworker/u8:13/20990:
#0: ffff8880b863b798 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:606
#1: ffff8880b8623f08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x318/0x6d0 kernel/sched/psi.c:975
1 lock held by syz.0.4801/23575:
#0: ffffffff8e194028 (tracepoints_mutex){+.+.}-{4:4}, at: tracepoint_probe_unregister+0x30/0x9b0 kernel/tracepoint.c:501
1 lock held by syz.0.4818/23627:
#0: ffffffff8e194028 (tracepoints_mutex){+.+.}-{4:4}, at: tracepoint_probe_unregister+0x30/0x9b0 kernel/tracepoint.c:501
1 lock held by syz.0.4830/23669:
#0: ffffffff8e194028 (tracepoints_mutex){+.+.}-{4:4}, at: tracepoint_probe_unregister+0x30/0x9b0 kernel/tracepoint.c:501
1 lock held by syz.6.4970/24099:
#0: ffff8880207440e0 (&type->s_umount_key#76){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
#0: ffff8880207440e0 (&type->s_umount_key#76){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:121
1 lock held by syz-executor/25382:
#0: ffffffff8e144b78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline]
#0: ffffffff8e144b78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730 kernel/rcu/tree_exp.h:998
1 lock held by syz.8.5423/25491:
#0: ffffffff8e194028 (tracepoints_mutex){+.+.}-{4:4}, at: tracepoint_probe_unregister+0x30/0x9b0 kernel/tracepoint.c:501
1 lock held by syz.8.5423/25492:
#0: ffff88805aa0fa08 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#0: ffff88805aa0fa08 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: __sock_release net/socket.c:646 [inline]
#0: ffff88805aa0fa08 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: sock_close+0x9b/0x240 net/socket.c:1391
2 locks held by syz.0.5426/25500:
#0: ffffffff8e194028 (tracepoints_mutex){+.+.}-{4:4}, at: tracepoint_probe_register_prio_may_exist+0x43/0xa0 kernel/tracepoint.c:431
#1: ffffffff8e144b78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline]
#1: ffffffff8e144b78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730 kernel/rcu/tree_exp.h:998
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-syzkaller-11796-g5abc7438f1e9 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:470
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 1 Comm: init Not tainted 6.15.0-syzkaller-11796-g5abc7438f1e9 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:check_preemption_disabled+0x17/0x120 lib/smp_processor_id.c:14
Code: 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 53 48 83 ec 10 65 48 8b 05 fe 5d 3b 07 48 89 44 24 08 <65> 8b 05 06 5e 3b 07 65 8b 0d fb 5d 3b 07 f7 c1 ff ff ff 7f 74 23
RSP: 0018:ffffc90000067448 EFLAGS: 00000086
RAX: d959667be7ec5500 RBX: ffff88801cee8000 RCX: d959667be7ec5500
RDX: 0000000000000000 RSI: ffffffff8db52219 RDI: ffffffff8be19e80
RBP: ffffc90000067550 R08: ffffffff8f9fcbf7 R09: 1ffffffff1f3f97e
R10: dffffc0000000000 R11: fffffbfff1f3f97f R12: dffffc0000000000
R13: 1ffff9200000ceb8 R14: ffffffff99c7acf0 R15: 1ffff9200000ce98
FS: 00007f077cbadc80(0000) GS:ffff888125c90000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556eeb17e000 CR3: 0000000034c00000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lockdep_recursion_finish kernel/locking/lockdep.c:473 [inline]
lockdep_hardirqs_on_prepare+0x1b4/0x2a0 kernel/locking/lockdep.c:4414
trace_hardirqs_on+0x28/0x40 kernel/trace/trace_preemptirq.c:78
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
_raw_spin_unlock_irqrestore+0x85/0x110 kernel/locking/spinlock.c:194
debug_rcu_head_queue kernel/rcu/rcu.h:237 [inline]
__call_rcu_common kernel/rcu/tree.c:3075 [inline]
call_rcu+0xae/0x990 kernel/rcu/tree.c:3210
destroy_inode fs/inode.c:401 [inline]
evict+0x847/0x9c0 fs/inode.c:834
proc_invalidate_siblings_dcache+0x42c/0x6c0 fs/proc/inode.c:152
release_task+0x1306/0x17f0 kernel/exit.c:292
wait_task_zombie kernel/exit.c:1266 [inline]
wait_consider_task+0x195a/0x2e60 kernel/exit.c:1493
do_wait_thread kernel/exit.c:1556 [inline]
__do_wait+0x153/0x740 kernel/exit.c:1674
do_wait+0x1f8/0x520 kernel/exit.c:1708
kernel_wait4+0x1af/0x280 kernel/exit.c:1867
__do_sys_wait4 kernel/exit.c:1895 [inline]
__se_sys_wait4 kernel/exit.c:1891 [inline]
__x64_sys_wait4+0x133/0x1e0 kernel/exit.c:1891
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f077ccfd407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffdfb3d5950 EFLAGS: 00000202 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 00007f077cbadc80 RCX: 00007f077ccfd407
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffffffffffffffff
RBP: 00007f077cefce89 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007f077cf17490
R13: 00007ffdfb3d59ac R14: 00007f077cf57000 R15: 000055e97490bd98