INFO: task syz-executor:5939 blocked for more than 144 seconds.
      Not tainted 6.12.0-syzkaller-01782-gbf9aa14fc523 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D
 stack:20624 pid:5939  tgid:5939  ppid:1      flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x17fb/0x4be0 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6848
 schedule_timeout+0xb0/0x290 kernel/time/sleep_timeout.c:75
 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+0x355/0x620 kernel/sched/completion.c:148
 __flush_work+0xa37/0xc50 kernel/workqueue.c:4217
 flush_work kernel/workqueue.c:4238 [inline]
 flush_delayed_work+0x169/0x1c0 kernel/workqueue.c:4260
 invalidate_dquots fs/quota/dquot.c:577 [inline]
 dquot_disable+0x7a7/0x1cd0 fs/quota/dquot.c:2295
 ocfs2_disable_quotas+0xf3/0x210 fs/ocfs2/super.c:963
 ocfs2_dismount_volume+0x1ad/0x8f0 fs/ocfs2/super.c:1870
 generic_shutdown_super+0x139/0x2d0 fs/super.c:642
 kill_block_super+0x44/0x90 fs/super.c:1710
 deactivate_locked_super+0xc4/0x130 fs/super.c:473
 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373
 task_work_run+0x24f/0x310 kernel/task_work.c:239
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0xa2f/0x28e0 kernel/exit.c:938
 do_group_exit+0x207/0x2c0 kernel/exit.c:1087
 __do_sys_exit_group kernel/exit.c:1098 [inline]
 __se_sys_exit_group kernel/exit.c:1096 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1096
 x64_sys_call+0x26a8/0x26b0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f558d17e759
RSP: 002b:00007ffefce9e4d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f558d1f1621 RCX: 00007f558d17e759
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 000000000000000d R08: 00007ffefce9c276 R09: 00007ffefce9f790
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffefce9f790
R13: 00007f558d1f15fc R14: 00000000000198e0 R15: 00007ffefcea0850
 </TASK>

Showing all locks held in the system:
10 locks held by kworker/u8:0/11:
1 lock held by khungtaskd/30:
 #0: 
ffffffff8e93c7e0
 (
rcu_read_lock
){....}-{1:3}
, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744
3 locks held by kworker/u8:2/35:
 #0: 
ffff8880308cf148
 (
(wq_completion)ipv6_addrconf
){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3204 [inline]
, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
 #1: 
ffffc90000ab7d00
 (
(work_completion)(&(&ifa->dad_work)->work)
){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3205 [inline]
, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
 #2: 
ffffffff8fccb3c8
 (
rtnl_mutex
){+.+.}-{4:4}
, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4196
3 locks held by kworker/u8:4/62:
 #0: 
ffff88801ac89148
 (
(wq_completion)events_unbound
){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3204 [inline]
, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
 #1: 
ffffc900015d7d00
 (
(linkwatch_work).work
){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3205 [inline]
, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
 #2: 
ffffffff8fccb3c8
 (
rtnl_mutex
){+.+.}-{4:4}
, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276
2 locks held by getty/5590:
 #0: 
ffff88814ea800a0
 (
&tty->ldisc_sem
){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002efe2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/5939:
 #0: 
ffff888031a120e0
 (
&type->s_umount_key
#57
){++++}-{4:4}
, at: __super_lock fs/super.c:56 [inline]
, at: __super_lock_excl fs/super.c:71 [inline]
, at: deactivate_super+0xb5/0xf0 fs/super.c:505
1 lock held by syz-executor/6660:
 #0: 
ffff88802a4e40e0
 (
&type->s_umount_key
#57){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline]
#57){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
#57){++++}-{4:4}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
4 locks held by kworker/0:7/6662:
1 lock held by syz-executor/6778:
 #0: ffff88806c3ec0e0 (&type->s_umount_key#57){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff88806c3ec0e0 (&type->s_umount_key#57){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff88806c3ec0e0 (&type->s_umount_key#57){++++}-{4:4}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
1 lock held by syz.0.175/7023:
 #0: ffff888031a120e0 (&type->s_umount_key#57){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff888031a120e0 (&type->s_umount_key#57){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.3.216/7525:
 #0: ffff88807b0220e0 (&type->s_umount_key
#27/1){+.+.}-{4:4}, at: alloc_super+0x221/0x9d0 fs/super.c:344
2 locks held by syz.9.237/7635:
 #0: ffffffff8f0569a8 (bio_slab_lock){+.+.}-{4:4}, at: bio_put_slab block/bio.c:140 [inline]
 #0: ffffffff8f0569a8 (bio_slab_lock){+.+.}-{4:4}, at: bioset_exit+0x42f/0x650 block/bio.c:1755
 #1: ffffffff8e941c40 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530 kernel/rcu/tree.c:4565
1 lock held by syz-executor/7686:
 #0: ffffffff8fccb3c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8fccb3c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6672
2 locks held by syz-executor/7808:
 #0: ffffffff8fccb3c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8fccb3c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6672
 #1: ffffffff8e941d78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline]
 #1: ffffffff8e941d78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:976
1 lock held by dhcpcd-run-hook/7902:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-syzkaller-01782-gbf9aa14fc523 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Call Trace:
 <TASK>
 __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+0x198/0x320 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+0xff4/0x1040 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
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11 Comm: kworker/u8:0 Not tainted 6.12.0-syzkaller-01782-gbf9aa14fc523 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Workqueue: events_unbound quota_release_workfn
RIP: 0010:prb_read kernel/printk/printk_ringbuffer.c:1919 [inline]
RIP: 0010:_prb_read_valid+0x21e/0xac0 kernel/printk/printk_ringbuffer.c:2113
Code: 00 00 e8 b5 0f 86 00 48 89 d8 48 c1 e8 03 49 bc 00 00 00 00 00 fc ff df 42 80 3c 20 00 74 08 48 89 df e8 25 0d 86 00 48 8b 1b <48> b8 ff ff ff ff ff ff ff 3f 48 21 c3 48 8d 84 24 f0 00 00 00 49
RSP: 0018:ffffc90000106dc0 EFLAGS: 00000246
RAX: 1ffffffff1d04720 RBX: 8000000100002788 RCX: ffffffff8175c42b
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8e823900
RBP: ffffc90000106f70 R08: ffffffff8e823907 R09: 1ffffffff1d04720
R10: dffffc0000000000 R11: fffffbfff1d04721 R12: dffffc0000000000
R13: 0000000000000788 R14: ffffffff8e87db00 R15: ffffffff8e818440
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff244870d8 CR3: 0000000030244000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 prb_read_valid+0xa9/0xf0 kernel/printk/printk_ringbuffer.c:2182
 printk_get_next_message+0x1ee/0xbe0 kernel/printk/printk.c:2964
 console_emit_next_record kernel/printk/printk.c:3047 [inline]
 console_flush_all+0x569/0xeb0 kernel/printk/printk.c:3181
 __console_flush_and_unlock kernel/printk/printk.c:3240 [inline]
 console_unlock+0x14f/0x3b0 kernel/printk/printk.c:3280
 vprintk_emit+0x730/0xa10 kernel/printk/printk.c:2408
 _printk+0xd5/0x120 kernel/printk/printk.c:2433
 __mlog_printk+0x281/0x2b0 fs/ocfs2/cluster/masklog.c:77
 ocfs2_start_trans+0x59e/0x700 fs/ocfs2/journal.c:357
 ocfs2_release_dquot+0x474/0xc40 fs/ocfs2/quota_global.c:761
 quota_release_workfn+0x39f/0x650 fs/quota/dquot.c:839
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 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
 </TASK>