INFO: task syz-executor.5:6662 blocked for more than 143 seconds.
Not tainted 6.2.0-rc3-next-20230110-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.5 state:D
stack:28256 pid:6662 ppid:5113 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5301 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6619
schedule+0xde/0x1b0 kernel/sched/core.c:6695
rwsem_down_read_slowpath+0x5a7/0xb20 kernel/locking/rwsem.c:1095
__down_read_common kernel/locking/rwsem.c:1260 [inline]
__down_read kernel/locking/rwsem.c:1269 [inline]
down_read+0xe6/0x450 kernel/locking/rwsem.c:1511
mmap_read_lock include/linux/mmap_lock.h:117 [inline]
do_user_addr_fault+0xa51/0x1210 arch/x86/mm/fault.c:1379
handle_page_fault arch/x86/mm/fault.c:1519 [inline]
exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1575
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7fd3e6a276c6
RSP: 002b:00007fff85bf47b8 EFLAGS: 00010287
RAX: 0000001b32a23000 RBX: 00007fd3e6bac018 RCX: 0000001b32a20000
RDX: 0000001b32a23004 RSI: 0000001b32a22280 RDI: 000000000d07a06e
RBP: 000000000d07a06e R08: 0000001b32e20000 R09: 000000000d07a072
R10: 00007fff85bfa090 R11: 000000000000fb9c R12: 00007fd3e6ba0000
R13: 0000000000000001 R14: 0000000000010b0a R15: ffffffff89b86815
Showing all threads with locks held in the system:
task:rcu_tasks_kthre state:I stack:29040 pid:12 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5301 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6619
schedule+0xde/0x1b0 kernel/sched/core.c:6695
rcu_tasks_one_gp+0x484/0xcd0 kernel/rcu/tasks.h:517
rcu_tasks_kthread+0x77/0xa0 kernel/rcu/tasks.h:555
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8c793470 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xcd0 kernel/rcu/tasks.h:510
task:rcu_tasks_trace state:I stack:29208 pid:13 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5301 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6619
schedule+0xde/0x1b0 kernel/sched/core.c:6695
rcu_tasks_one_gp+0x484/0xcd0 kernel/rcu/tasks.h:517
rcu_tasks_kthread+0x77/0xa0 kernel/rcu/tasks.h:555
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8c793170 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xcd0 kernel/rcu/tasks.h:510
task:getty state:S stack:23336 pid:4752 ppid:1 flags:0x00000000
Call Trace:
context_switch kernel/sched/core.c:5301 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6619
schedule+0xde/0x1b0 kernel/sched/core.c:6695
schedule_timeout+0x1e1/0x2a0 kernel/time/timer.c:2143
wait_woken+0x197/0x200 kernel/sched/wait.c:463
n_tty_read+0x1055/0x13e0 drivers/tty/n_tty.c:2243
iterate_tty_read drivers/tty/tty_io.c:852 [inline]
tty_read+0x30e/0x5a0 drivers/tty/tty_io.c:927
call_read_iter include/linux/fs.h:1846 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x681/0x930 fs/read_write.c:470
ksys_read+0x12b/0x250 fs/read_write.c:613
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7faaf2c8c8fe
RSP: 002b:00007ffed8708098 EFLAGS: 00000246
ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000560aa40af910 RCX: 00007faaf2c8c8fe
RDX: 0000000000000001 RSI: 00007ffed87080b0 RDI: 0000000000000000
RBP: 0000560aa40af970 R08: 0000000000000007 R09: 0000560aa40b0cd0
R10: 0000000000000063 R11: 0000000000000246 R12: 0000560aa40af9ac
R13: 00007ffed87080b0 R14: 0000000000000000 R15: 0000560aa40af9ac
2 locks held by getty/4752:
#0: ffff88814b6a8098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:244
#1: ffffc900015802f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2177
task:kworker/0:6 state:D stack:24328 pid:5169 ppid:2 flags:0x00004000
Workqueue: events fqdir_free_fn
Call Trace:
context_switch kernel/sched/core.c:5301 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6619
schedule+0xde/0x1b0 kernel/sched/core.c:6695
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6754
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0xa48/0x1360 kernel/locking/mutex.c:747
rcu_barrier+0x48/0x6d0 kernel/rcu/tree.c:3944
fqdir_free_fn+0x32/0x160 net/ipv4/inet_fragment.c:164
process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293
worker_thread+0x669/0x1090 kernel/workqueue.c:2440
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
3 locks held by kworker/0:6/5169:
#0:
ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline]
ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x86d/0x1750 kernel/workqueue.c:2264
#1:
ffffc900046afda8
(fqdir_free_work){+.+.}-{0:0}, at: process_one_work+0x8a1/0x1750 kernel/workqueue.c:2268
#2: ffffffff8c79f000 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x6d0 kernel/rcu/tree.c:3944
task:kworker/u4:9 state:R
stack:22424 pid:5414 ppid:2 flags:0x00004000
Workqueue: 0x0 (bat_events)
Call Trace:
context_switch kernel/sched/core.c:5301 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6619
schedule+0xde/0x1b0 kernel/sched/core.c:6695
worker_thread+0x160/0x1090 kernel/workqueue.c:2461
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
no locks held by kworker/u4:9/5414.
task:kworker/0:16 state:D
stack:25496 pid:6515 ppid:2 flags:0x00004000
Workqueue: events pwq_unbound_release_workfn
Call Trace:
context_switch kernel/sched/core.c:5301 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6619
schedule+0xde/0x1b0 kernel/sched/core.c:6695
synchronize_rcu_expedited+0x5e2/0x770 kernel/rcu/tree_exp.h:1007
synchronize_rcu+0x302/0x3b0 kernel/rcu/tree.c:3482
lockdep_unregister_key+0x282/0x460 kernel/locking/lockdep.c:6362
wq_unregister_lockdep kernel/workqueue.c:3501 [inline]
pwq_unbound_release_workfn+0x258/0x340 kernel/workqueue.c:3739
process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293
worker_thread+0x669/0x1090 kernel/workqueue.c:2440
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
3 locks held by kworker/0:16/6515:
#0: ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
#0: ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline]
#0: ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
#0: ffff888012470d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x86d/0x1750 kernel/workqueue.c:2264
#1: ffffc90005d4fda8 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x8a1/0x1750 kernel/workqueue.c:2268
#2: ffffffff8c79f138 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:293 [inline]
#2: ffffffff8c79f138 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x658/0x770 kernel/rcu/tree_exp.h:992
task:syz-executor.5 state:D stack:28256 pid:6662 ppid:5113 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5301 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6619
schedule+0xde/0x1b0 kernel/sched/core.c:6695
rwsem_down_read_slowpath+0x5a7/0xb20 kernel/locking/rwsem.c:1095
__down_read_common kernel/locking/rwsem.c:1260 [inline]
__down_read kernel/locking/rwsem.c:1269 [inline]
down_read+0xe6/0x450 kernel/locking/rwsem.c:1511
mmap_read_lock include/linux/mmap_lock.h:117 [inline]
do_user_addr_fault+0xa51/0x1210 arch/x86/mm/fault.c:1379
handle_page_fault arch/x86/mm/fault.c:1519 [inline]
exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1575
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7fd3e6a276c6
RSP: 002b:00007fff85bf47b8 EFLAGS: 00010287
RAX: 0000001b32a23000 RBX: 00007fd3e6bac018 RCX: 0000001b32a20000
RDX: 0000001b32a23004 RSI: 0000001b32a22280 RDI: 000000000d07a06e
RBP: 000000000d07a06e R08: 0000001b32e20000 R09: 000000000d07a072
R10: 00007fff85bfa090 R11: 000000000000fb9c R12: 00007fd3e6ba0000
R13: 0000000000000001 R14: 0000000000010b0a R15: ffffffff89b86815
1 lock held by syz-executor.5/6662:
#0: ffff888029000198 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline]
#0: ffff888029000198 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0xa51/0x1210 arch/x86/mm/fault.c:1379
task:syz-executor.5 state:R
running task stack:26944 pid:6665 ppid:5113 flags:0x00004006
Call Trace:
1 lock held by syz-executor.5/6665:
task:kworker/0:18 state:D stack:24704 pid:6870 ppid:2 flags:0x00004000
Workqueue: rcu_gp wait_rcu_exp_gp
Call Trace:
context_switch kernel/sched/core.c:5301 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6619
schedule+0xde/0x1b0 kernel/sched/core.c:6695
schedule_timeout+0x14e/0x2a0 kernel/time/timer.c:2167
synchronize_rcu_expedited_wait_once kernel/rcu/tree_exp.h:572 [inline]
synchronize_rcu_expedited_wait kernel/rcu/tree_exp.h:624 [inline]
rcu_exp_wait_wake+0x2ab/0x1220 kernel/rcu/tree_exp.h:693
process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293
worker_thread+0x669/0x1090 kernel/workqueue.c:2440
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
2 locks held by kworker/0:18/6870:
#0: ffff888012472538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888012472538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff888012472538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
#0: ffff888012472538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline]
#0: ffff888012472538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
#0: ffff888012472538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x86d/0x1750 kernel/workqueue.c:2264
#1: ffffc9000c27fda8 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x8a1/0x1750 kernel/workqueue.c:2268
task:kworker/u4:15 state:D stack:23112 pid:7721 ppid:2 flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
context_switch kernel/sched/core.c:5301 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6619
schedule+0xde/0x1b0 kernel/sched/core.c:6695
exp_funnel_lock kernel/rcu/tree_exp.h:316 [inline]
synchronize_rcu_expedited+0x706/0x770 kernel/rcu/tree_exp.h:992
synchronize_rcu+0x302/0x3b0 kernel/rcu/tree.c:3482
synchronize_net+0x4e/0x60 net/core/dev.c:10749
nf_conntrack_cleanup_net_list+0x9e/0x5d0 net/netfilter/nf_conntrack_core.c:2555
ops_exit_list+0x125/0x170 net/core/net_namespace.c:174
cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606
process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293
worker_thread+0x669/0x1090 kernel/workqueue.c:2440
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
3 locks held by kworker/u4:15/7721:
#0: ffff8880125df938
(
(wq_completion)netns
){+.+.}-{0:0}
, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
, at: set_work_data kernel/workqueue.c:636 [inline]
, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
, at: process_one_work+0x86d/0x1750 kernel/workqueue.c:2264
#1:
ffffc900035afda8
(
net_cleanup_work
){+.+.}-{0:0}, at: process_one_work+0x8a1/0x1750 kernel/workqueue.c:2268
#2: ffffffff8e0b3510 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9f/0xb10 net/core/net_namespace.c:568
task:syz-executor.3 state:D stack:28112 pid:8487 ppid:5120 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5301 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6619
schedule+0xde/0x1b0 kernel/sched/core.c:6695
schedule_timeout+0x1e1/0x2a0 kernel/time/timer.c:2143
do_wait_for_common kernel/sched/completion.c:85 [inline]
__wait_for_common+0x1ce/0x5c0 kernel/sched/completion.c:106
rcu_barrier+0x37f/0x6d0 kernel/rcu/tree.c:4012
kvm_mmu_uninit_vm+0x6a/0x70 arch/x86/kvm/mmu/mmu.c:6120
kvm_arch_destroy_vm+0x369/0x490 arch/x86/kvm/x86.c:12286
kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:1318 [inline]
kvm_put_kvm+0x4ea/0xb90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1352
kvm_vm_release+0x43/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1375
__fput+0x27c/0xa90 fs/file_table.c:321
task_work_run+0x16f/0x270 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f265343df7b
RSP: 002b:00007ffca79ecac0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007f265343df7b
RDX: 0000000000000000 RSI: 0000001b32d20ed8 RDI: 0000000000000004
RBP: 00007f26535ad980 R08: 0000000000000000 R09: 00000000163c2d9e
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000076680
R13: 00007ffca79ecbc0 R14: 00007f26535ac050 R15: 0000000000000032
1 lock held by syz-executor.3/8487:
#0: ffffffff8c79f000 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x6d0 kernel/rcu/tree.c:3944
task:syz-executor.2 state:D
stack:24768 pid:8508 ppid:5110 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5301 [inline]
__schedule+0x25d0/0x5a70 kernel/sched/core.c:6619
schedule+0xde/0x1b0 kernel/sched/core.c:6695
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6754
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0xa48/0x1360 kernel/locking/mutex.c:747
exp_funnel_lock kernel/rcu/tree_exp.h:325 [inline]
synchronize_rcu_expedited+0x400/0x770 kernel/rcu/tree_exp.h:992
namespace_unlock+0x1af/0x410 fs/namespace.c:1602
drop_collected_mounts fs/namespace.c:2089 [inline]
put_mnt_ns fs/namespace.c:4554 [inline]
put_mnt_ns+0x10a/0x150 fs/namespace.c:4550
mount_subtree+0x23e/0x480 fs/namespace.c:3658
mount_subvol fs/btrfs/super.c:1384 [inline]
btrfs_mount+0x27c/0xa90 fs/btrfs/super.c:1612
legacy_get_tree+0x109/0x220 fs/fs_context.c:610
vfs_get_tree+0x8d/0x2f0 fs/super.c:1489
do_new_mount fs/namespace.c:3145 [inline]
path_mount+0x132a/0x1e20 fs/namespace.c:3475
do_mount fs/namespace.c:3488 [inline]
__do_sys_mount fs/namespace.c:3697 [inline]
__se_sys_mount fs/namespace.c:3674 [inline]
__x64_sys_mount+0x283/0x300 fs/namespace.c:3674
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f85b248d5fa
RSP: 002b:00007f85b0ffdf88 EFLAGS: 00000202
ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000000051ab RCX: 00007f85b248d5fa
RDX: 00000000200051c0 RSI: 0000000020005200 RDI: 00007f85b0ffdfe0
RBP: 00007f85b0ffe020 R08: 00007f85b0ffe020 R09: 0000000001000008
R10: 0000000001000008 R11: 0000000000000202 R12: 00000000200051c0
R13: 0000000020005200 R14: 00007f85b0ffdfe0 R15: 0000000020000280
1 lock held by syz-executor.2/8508:
#0:
ffffffff8c79f138
(rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:325 [inline]
(rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x400/0x770 kernel/rcu/tree_exp.h:992
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.2.0-rc3-next-20230110-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x24/0x18a lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x32f/0x3c0 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+0xcae/0x1050 kernel/hung_task.c:377
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8562 Comm: syz-executor.1 Not tainted 6.2.0-rc3-next-20230110-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:lock_release+0x62/0x810 kernel/locking/lockdep.c:5677
Code: 03 48 c7 44 24 18 d0 4d f1 8b 48 01 e8 48 c7 44 24 20 90 18 64 81 c7 00 f1 f1 f1 f1 c7 40 04 f1 f1 04 f2 c7 40 08 04 f3 f3 f3 <65> 48 8b 04 25 28 00 00 00 48 89 84 24 88 00 00 00 31 c0 0f 1f 44
RSP: 0018:ffffc90017597a98 EFLAGS: 00000286
RAX: fffff52002eb2f55 RBX: ffffffff91d5a440 RCX: ffffc9000d5bc000
RDX: 0000000000000004 RSI: ffffffff81e9db53 RDI: ffffffff8c93d4b8
RBP: 1ffff92002eb2f55 R08: 0000000000000001 R09: 0000000000000003
R10: fffff52002eb2f60 R11: 0000000000000000 R12: ffffffff8c93d4b8
R13: ffffffff8cdea880 R14: ffff888144a6e620 R15: 0000000000008124
FS: 00007f95121da700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32822000 CR3: 000000003a7bc000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
_raw_spin_unlock+0x16/0x40 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:390 [inline]
simple_pin_fs+0x93/0x190 fs/libfs.c:725
start_creating.part.0+0x5a/0x280 fs/debugfs/inode.c:356
start_creating fs/debugfs/inode.c:348 [inline]
__debugfs_create_file+0xa9/0x540 fs/debugfs/inode.c:420
bdi_debug_register mm/backing-dev.c:114 [inline]
bdi_register_va.part.0+0x274/0x8a0 mm/backing-dev.c:1003
bdi_register_va mm/backing-dev.c:1031 [inline]
bdi_register+0x12e/0x140 mm/backing-dev.c:1028
device_add_disk+0x9e4/0xfb0 block/genhd.c:490
add_disk include/linux/blkdev.h:752 [inline]
loop_add+0x884/0xaf0 drivers/block/loop.c:2045
loop_control_ioctl+0x137/0x620 drivers/block/loop.c:2164
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f951148c0c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f95121da168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f95115ac120 RCX: 00007f951148c0c9
RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000006
RBP: 00007f95114e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdf79b303f R14: 00007f95121da300 R15: 0000000000022000