INFO: task syz-executor.4:14061 blocked for more than 143 seconds.
      Not tainted 6.7.0-rc1-syzkaller-00019-gc42d9eeef8e5 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:27216 pid:14061 tgid:14056 ppid:5114   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0x1961/0x4ab0 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
 get_signal+0x166e/0x1840 kernel/signal.c:2680
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:309
 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0xb1/0x150 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x69/0x2a0 kernel/entry/common.c:296
 do_syscall_64+0x52/0x110 arch/x86/entry/common.c:88
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f8f24a7cae9
RSP: 002b:00007f8f2571d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007f8f24b9bf80 RCX: 00007f8f24a7cae9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007f8f24ac847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f8f24b9bf80 R15: 00007ffd50c41cb8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8d92d060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #0: ffffffff8d92d060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #0: ffffffff8d92d060 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6613
2 locks held by getty/4811:
 #0: ffff88814b2410a0 (&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+0x6b4/0x1e10 drivers/tty/n_tty.c:2201
3 locks held by kworker/u4:14/7516:
1 lock held by udevd/13974:
 #0: ffff8881423f84c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x123/0x480 block/bdev.c:786
1 lock held by udevd/14011:
 #0: ffff88801cafb4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x123/0x480 block/bdev.c:786
1 lock held by syz-executor.4/14061:
 #0: ffff88801cafb4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xff/0x770 block/bdev.c:928
1 lock held by udevd/14071:
 #0: ffff8881423d14c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x123/0x480 block/bdev.c:786
1 lock held by udevd/14097:
 #0: ffff88801c90e4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x123/0x480 block/bdev.c:786
1 lock held by syz-executor.4/14167:
 #0: ffff88801cafb4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x123/0x480 block/bdev.c:786
1 lock held by syz-executor.2/14179:
 #0: ffff8881423f84c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xff/0x770 block/bdev.c:928
1 lock held by syz-executor.3/14184:
 #0: ffff88801c90e4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xff/0x770 block/bdev.c:928
1 lock held by syz-executor.0/14183:
 #0: ffff8881423d14c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xff/0x770 block/bdev.c:928
1 lock held by syz-executor.4/14227:
 #0: ffff88801cafb4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x123/0x480 block/bdev.c:786

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

NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.7.0-rc1-syzkaller-00019-gc42d9eeef8e5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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+0xfaf/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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 7516 Comm: kworker/u4:14 Not tainted 6.7.0-rc1-syzkaller-00019-gc42d9eeef8e5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Workqueue: bat_events batadv_nc_worker
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:67 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:103 [inline]
RIP: 0010:lock_acquire+0x175/0x530 kernel/locking/lockdep.c:5749
Code: 4c 8d bc 24 80 00 00 00 4c 89 fb 48 c1 eb 03 42 80 3c 2b 00 74 08 4c 89 ff e8 77 34 7d 00 48 c7 84 24 80 00 00 00 00 00 00 00 <9c> 8f 84 24 80 00 00 00 42 80 3c 2b 00 74 08 4c 89 ff e8 b4 33 7d
RSP: 0018:ffffc9000d02fa20 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffff92001a05f54 RCX: ffffffff816d2714
RDX: 0000000000000000 RSI: ffffffff8bbdf2e0 RDI: ffffffff8bbdf2a0
RBP: ffffc9000d02fb80 R08: ffffffff8f00c12f R09: 1ffffffff1e01825
R10: dffffc0000000000 R11: fffffbfff1e01826 R12: 1ffff92001a05f4c
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc9000d02faa0
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0007fc000 CR3: 0000000027901000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 rcu_read_lock include/linux/rcupdate.h:747 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
 batadv_nc_worker+0xec/0x610 net/batman-adv/network-coding.c:719
 process_one_work kernel/workqueue.c:2630 [inline]
 process_scheduled_works+0x90f/0x1420 kernel/workqueue.c:2703
 worker_thread+0xa5f/0x1000 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>