INFO: task syz-executor.3:8576 blocked for more than 143 seconds.
Not tainted 6.8.0-rc7-syzkaller-00051-g67be068d31d4 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3 state:D stack:20408 pid:8576 tgid:8576 ppid:1 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x177f/0x49a0 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6817
schedule_timeout+0xb0/0x310 kernel/time/timer.c:2159
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion+0x354/0x620 kernel/sched/completion.c:148
btrfs_qgroup_wait_for_completion+0x92/0xc0 fs/btrfs/qgroup.c:3849
close_ctree+0x118/0xd40 fs/btrfs/disk-io.c:4254
generic_shutdown_super+0x136/0x2d0 fs/super.c:641
kill_anon_super+0x3b/0x70 fs/super.c:1225
btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2093
deactivate_locked_super+0xc4/0x130 fs/super.c:472
cleanup_mnt+0x426/0x4c0 fs/namespace.c:1267
task_work_run+0x24e/0x310 kernel/task_work.c:180
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:108 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
syscall_exit_to_user_mode+0x167/0x360 kernel/entry/common.c:212
do_syscall_64+0x108/0x240 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f111f67f0d7
RSP: 002b:00007ffdcb9001a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f111f67f0d7
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffdcb900260
RBP: 00007ffdcb900260 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffdcb901320
R13: 00007f111f6c93b9 R14: 000000000015da3a R15: 0000000000000004
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8e130be0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#0: ffffffff8e130be0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#0: ffffffff8e130be0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by kworker/u4:2/34:
2 locks held by getty/4820:
#0: ffff88802b3b20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201
1 lock held by syz-executor.3/8576:
#0: ffff88807e0b40e0 (&type->s_umount_key#62){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88807e0b40e0 (&type->s_umount_key#62){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88807e0b40e0 (&type->s_umount_key#62){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:504
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc7-syzkaller-00051-g67be068d31d4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xfaf/0xff0 kernel/hung_task.c:379
kthread+0x2ef/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 27824 Comm: syz-executor.0 Not tainted 6.8.0-rc7-syzkaller-00051-g67be068d31d4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
RIP: 0010:_raw_spin_lock+0x29/0x40 kernel/locking/spinlock.c:154
Code: 90 f3 0f 1e fa 53 48 89 fb bf 01 00 00 00 e8 6e 34 fb f5 48 8d 7b 18 31 f6 31 d2 31 c9 41 b8 01 00 00 00 45 31 c9 ff 74 24 08 e2 fe 07 f6 48 83 c4 08 48 89 df 5b e9 85 5f 09 f6 0f 1f 44 00
RSP: 0018:ffffc900161b7b28 EFLAGS: 00000246
RAX: 1ffff110046f964d RBX: ffff88802a736480 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88802a736498
RBP: ffffc900161b7c30 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed10046f93b9 R12: ffff88802a736000
R13: 0000000000000001 R14: dffffc0000000000 R15: 0000000000000000
FS: 00007f6a76fbf6c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c00d627000 CR3: 0000000030948000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
spin_lock include/linux/spinlock.h:351 [inline]
io_cq_lock io_uring/io_uring.c:648 [inline]
__io_cqring_overflow_flush+0x156/0x610 io_uring/io_uring.c:701
io_cqring_do_overflow_flush io_uring/io_uring.c:727 [inline]
io_cqring_wait io_uring/io_uring.c:2670 [inline]
__do_sys_io_uring_enter io_uring/io_uring.c:3701 [inline]
__se_sys_io_uring_enter+0x1f45/0x2b50 io_uring/io_uring.c:3591
do_syscall_64+0xf9/0x240
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f6a7627dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6a76fbf0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 00007f6a763abf80 RCX: 00007f6a7627dda9
RDX: 0000000000400000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f6a762ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f6a763abf80 R15: 00007ffe64a08ac8