INFO: task syz-executor257:5111 blocked for more than 143 seconds.
      Not tainted 6.6.0-syzkaller-03860-g5a6a09e97199 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor257 state:D stack:27496 pid:5111  tgid:5110  ppid:5086   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0x1960/0x4a80 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0x149/0x260 kernel/sched/core.c:6778
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6a3/0xd60 kernel/locking/mutex.c:747
 blkdev_put+0xff/0x770 block/bdev.c:928
 bdev_release+0x57/0x70 block/bdev.c:952
 blkdev_release+0x3b/0x40 block/fops.c:616
 __fput+0x3cc/0xa10 fs/file_table.c:394
 task_work_run+0x24a/0x300 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296
 do_syscall_64+0x50/0x110 arch/x86/entry/common.c:88
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fa873f82479
RSP: 002b:00007fa873f40228 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007fa874009328 RCX: 00007fa873f82479
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007fa874009320 R08: 00007fa873f406c0 R09: 00007fa873f406c0
R10: 00007fa873f406c0 R11: 0000000000000246 R12: 00007fa87400932c
R13: 00007fa873fd61a4 R14: 64626e2f7665642f R15: 00007ffd9fd4c8a8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8d72d4a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #0: ffffffff8d72d4a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #0: ffffffff8d72d4a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6613
2 locks held by getty/4809:
 #0: ffff88802647d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b1/0x1dc0 drivers/tty/n_tty.c:2206
1 lock held by udevd/5087:
 #0: ffff88814172e4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x137/0x620 block/bdev.c:786
1 lock held by syz-executor257/5111:
 #0: ffff88814172e4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xff/0x770 block/bdev.c:928

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.6.0-syzkaller-03860-g5a6a09e97199 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x310 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+0xfa9/0xff0 kernel/hung_task.c:379
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 1049 Comm: kworker/u4:6 Not tainted 6.6.0-syzkaller-03860-g5a6a09e97199 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:rcu_sync_is_idle include/linux/rcu_sync.h:34 [inline]
RIP: 0010:percpu_down_read include/linux/percpu-rwsem.h:62 [inline]
RIP: 0010:cpus_read_lock+0x5b/0x150 kernel/cpu.c:489
Code: b8 01 00 00 00 45 31 c9 ff 74 24 08 e8 7e b4 18 00 48 83 c4 08 bf 01 00 00 00 e8 20 2a 0c 00 e8 3b 30 b8 09 89 c3 31 ff 89 c6 <e8> 30 06 3a 00 85 db 74 1b e8 57 eb 20 00 89 c3 31 ff 89 c6 e8 1c
RSP: 0018:ffffc900044d7b00 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffff88801eb59dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900044d7bf0 R08: dffffc0000000000 R09: 1ffffffff2173c74
R10: dffffc0000000000 R11: fffffbfff2173c75 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff923fa7a0 R15: 1ffff9200089af64
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8ffc122580 CR3: 000000000d530000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 static_key_disable+0x12/0x20 kernel/jump_label.c:242
 toggle_allocation_gate+0x1b8/0x250 mm/kfence/core.c:835
 process_one_work kernel/workqueue.c:2630 [inline]
 process_scheduled_works+0x90f/0x1400 kernel/workqueue.c:2703
 worker_thread+0xa5f/0xff0 kernel/workqueue.c:2784
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.047 msecs