INFO: task syz-executor.0:5491 blocked for more than 143 seconds.
Not tainted 6.12.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:27432 pid:5491 tgid:5490 ppid:5339 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x1843/0x4ac0 kernel/sched/core.c:6682
__schedule_loop kernel/sched/core.c:6759 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6774
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x6a7/0xd70 kernel/locking/mutex.c:752
bdev_release+0x17e/0x700 block/bdev.c:1087
blkdev_release+0x15/0x20 block/fops.c:639
__fput+0x23f/0x880 fs/file_table.c:431
task_work_run+0x24f/0x310 kernel/task_work.c:228
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x167/0x360 kernel/entry/common.c:218
do_syscall_64+0x8e/0x160 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f6e2607cb29
RSP: 002b:00007f6e26eb80c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007f6e2619bf80 RCX: 00007f6e2607cb29
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007f6e260c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f6e2619bf80 R15: 00007ffd7991ce88
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8df332a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8df332a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8df332a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720
1 lock held by kworker/u8:8/3671:
#0: ffff8880b923ea98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:593
2 locks held by getty/4792:
#0: ffff88802bf820a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002efe2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by udevd/5342:
#0: ffff888141bbf4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xd1/0xd90 block/bdev.c:904
1 lock held by syz-executor.0/5491:
#0: ffff888141bbf4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_release+0x17e/0x700 block/bdev.c:1087
1 lock held by syz-executor.0/5716:
#0: ffff888141bbf4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xd1/0xd90 block/bdev.c:904
1 lock held by syz-executor.0/5732:
#0: ffff888141bbf4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xd1/0xd90 block/bdev.c:904
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
watchdog+0xfec/0x1030 kernel/hung_task.c:379
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 4473 Comm: syslogd Not tainted 6.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x90 kernel/kcov.c:313
Code: 10 48 89 74 0a 18 4c 89 44 0a 20 c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 4c 8b 04 24 65 48 8b 14 25 c0 d7 03 00 65 8b 05 b0 29
RSP: 0018:ffffc90003397cb0 EFLAGS: 00000246
RAX: 0000000080000001 RBX: 0000000080000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff820974f2 R09: 1ffffffff1ed5105
R10: dffffc0000000000 R11: fffffbfff1ed5106 R12: dffffc0000000000
R13: 1ffff92000672fa8 R14: ffff888027cba350 R15: dffffc0000000000
FS: 00007f336c970380(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ae1b560680 CR3: 0000000029a98000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
should_resched arch/x86/include/asm/preempt.h:103 [inline]
percpu_up_read include/linux/percpu-rwsem.h:121 [inline]
__sb_end_write include/linux/fs.h:1711 [inline]
sb_end_write+0xdc/0x1c0 include/linux/fs.h:1804
file_end_write include/linux/fs.h:2951 [inline]
vfs_write+0x7bf/0xc90 fs/read_write.c:691
ksys_write+0x183/0x2b0 fs/read_write.c:736
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x82/0x160 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f336cac4bf2
Code: 89 c7 48 89 44 24 08 e8 7b 34 fa ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6f 48 8b 15 07 a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffc6697ff58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f336cac4bf2
RDX: 0000000000000063 RSI: 000055eea4deec50 RDI: 0000000000000003
RBP: 000055eea4deec50 R08: 0000000000000001 R09: 0000000000000000
R10: 00007f336cc633a3 R11: 0000000000000246 R12: 0000000000000063
R13: 00007f336c970300 R14: 0000000000000004 R15: 000055eea4deea60