syzbot

INFO: task syz-executor592:5316 blocked for more than 143 seconds.
      Not tainted 6.7.0-rc8-syzkaller-00177-g52b1853b080a #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor592 state:D stack:28176 pid:5316  tgid:5315  ppid:5091   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0xedb/0x5af0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe9/0x270 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+0x5b9/0x9d0 kernel/locking/mutex.c:747
 blkdev_put+0xb0/0x8e0 block/bdev.c:930
 bdev_release+0x4f/0x80 block/bdev.c:954
 blkdev_release+0x37/0x50 block/fops.c:616
 __fput+0x270/0xb70 fs/file_table.c:394
 task_work_run+0x14d/0x240 kernel/task_work.c:180
 get_signal+0x106f/0x2790 kernel/signal.c:2680
 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:309
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x121/0x240 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296
 do_syscall_64+0x4d/0x110 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f88c460f479
RSP: 002b:00007f88c45cd228 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007f88c4696328 RCX: 00007f88c460f479
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007f88c4696320 R08: 00007f88c45cd6c0 R09: 00007f88c45cd6c0
R10: 00007f88c45cd6c0 R11: 0000000000000246 R12: 00007f88c469632c
R13: 00007f88c46631a4 R14: 64626e2f7665642f R15: 00007ffd2c93c308
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/28:
 #0: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #0: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #0: ffffffff8cfa7d60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614
5 locks held by kworker/u4:4/57:
2 locks held by getty/4818:
 #0: ffff8880264a70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc900020482f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc6/0x1490 drivers/tty/n_tty.c:2201
1 lock held by udevd/5092:
 #0: ffff888140fa94c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x4ea/0xb10 block/bdev.c:788
1 lock held by syz-executor592/5316:
 #0: ffff888140fa94c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xb0/0x8e0 block/bdev.c:930

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

NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.7.0-rc8-syzkaller-00177-g52b1853b080a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x277/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x299/0x300 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+0xf87/0x1210 kernel/hung_task.c:379
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 57 Comm: kworker/u4:4 Not tainted 6.7.0-rc8-syzkaller-00177-g52b1853b080a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:lock_is_held_type+0xf0/0x140 kernel/locking/lockdep.c:5827
Code: 45 31 ed 44 39 f0 41 0f 94 c5 48 c7 c7 40 a2 cc 8a e8 e4 11 00 00 b8 ff ff ff ff 65 0f c1 05 4f 3a 83 75 83 f8 01 75 29 9c 58 <f6> c4 02 75 3f 48 f7 04 24 00 02 00 00 74 01 fb 48 83 c4 08 44 89
RSP: 0018:ffffc9000203f8c8 EFLAGS: 00000046
RAX: 0000000000000046 RBX: ffff888019edac10 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8acca240 RDI: ffffffff8b2ed960
RBP: ffff8880b983c758 R08: 0000000000000000 R09: fffffbfff1e30e2a
R10: ffffffff8f187157 R11: 0000000000000003 R12: ffff888019eda100
R13: 0000000000000001 R14: 00000000ffffffff R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055eecf18a2e0 CR3: 000000000cd77000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 lock_is_held include/linux/lockdep.h:288 [inline]
 lockdep_assert_rq_held kernel/sched/sched.h:1340 [inline]
 cpuacct_charge+0x108/0x3e0 kernel/sched/cpuacct.c:339
 cgroup_account_cputime include/linux/cgroup.h:716 [inline]
 update_curr+0x552/0xaf0 kernel/sched/fair.c:1169
 dequeue_entity+0x56/0x1130 kernel/sched/fair.c:5317
 dequeue_task_fair+0x1cf/0xac0 kernel/sched/fair.c:6765
 deactivate_task kernel/sched/core.c:2134 [inline]
 __schedule+0x1486/0x5af0 kernel/sched/core.c:6642
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6778
 toggle_allocation_gate mm/kfence/core.c:832 [inline]
 toggle_allocation_gate+0x1d3/0x250 mm/kfence/core.c:822
 process_one_work+0x886/0x15d0 kernel/workqueue.c:2627
 process_scheduled_works kernel/workqueue.c:2700 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2781
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 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: 1.519 msecs