INFO: task syz-executor:6620 blocked for more than 143 seconds. Not tainted 6.12.0-rc5-syzkaller-00181-g6c52d4da1c74 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:20360 pid:6620 tgid:6620 ppid:1 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5328 [inline] __schedule+0x18a7/0x4b70 kernel/sched/core.c:6690 __schedule_loop kernel/sched/core.c:6767 [inline] schedule+0x147/0x320 kernel/sched/core.c:6782 schedule_timeout+0xac/0x310 kernel/time/timer.c:2591 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+0x351/0x620 kernel/sched/completion.c:148 __flush_work+0xa33/0xc40 kernel/workqueue.c:4217 flush_work kernel/workqueue.c:4238 [inline] flush_delayed_work+0x165/0x1c0 kernel/workqueue.c:4260 invalidate_dquots fs/quota/dquot.c:577 [inline] dquot_disable+0x7a3/0x1cd0 fs/quota/dquot.c:2295 ocfs2_disable_quotas+0xf3/0x210 fs/ocfs2/super.c:963 ocfs2_dismount_volume+0x1a9/0x8e0 fs/ocfs2/super.c:1870 generic_shutdown_super+0x135/0x2d0 fs/super.c:642 kill_block_super+0x40/0x90 fs/super.c:1696 deactivate_locked_super+0xc0/0x120 fs/super.c:473 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373 task_work_run+0x24b/0x310 kernel/task_work.c:239 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0xa2b/0x28d0 kernel/exit.c:939 do_group_exit+0x203/0x2b0 kernel/exit.c:1088 __do_sys_exit_group kernel/exit.c:1099 [inline] __se_sys_exit_group kernel/exit.c:1097 [inline] __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1097 x64_sys_call+0x2630/0x2630 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x7e/0x180 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f0b2b97e719 RSP: 002b:00007ffdc4abe838 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f0b2b9f11f1 RCX: 00007f0b2b97e719 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 000000000000000d R08: 00007ffdc4abc5d6 R09: 00007ffdc4abfaf0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdc4abfaf0 R13: 00007f0b2b9f11cc R14: 0000000000021bf0 R15: 00007ffdc4ac0bb0 Showing all locks held in the system: 5 locks held by kworker/u8:0/11: 1 lock held by khungtaskd/30: #0: ffffffff8e3371e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e3371e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e3371e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6720 2 locks held by getty/5532: #0: ffff8880337c00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a2/0x1df0 drivers/tty/n_tty.c:2211 1 lock held by syz-executor/6620: #0: ffff8880245760e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880245760e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880245760e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: deactivate_super+0xb1/0xf0 fs/super.c:505 1 lock held by syz-executor/6947: #0: ffff888031df20e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff888031df20e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff888031df20e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: deactivate_super+0xb1/0xf0 fs/super.c:505 1 lock held by syz-executor/7308: #0: ffff88807b4ee0e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88807b4ee0e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88807b4ee0e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: deactivate_super+0xb1/0xf0 fs/super.c:505 1 lock held by syz-executor/7586: #0: ffff88807eb7a0e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88807eb7a0e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88807eb7a0e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: deactivate_super+0xb1/0xf0 fs/super.c:505 1 lock held by syz-executor/7867: #0: ffff888063c5a0e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff888063c5a0e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff888063c5a0e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: deactivate_super+0xb1/0xf0 fs/super.c:505 1 lock held by syz-executor/8156: #0: ffff88802fee40e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88802fee40e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88802fee40e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: deactivate_super+0xb1/0xf0 fs/super.c:505 1 lock held by syz-executor/8445: #0: ffff88807313a0e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88807313a0e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88807313a0e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: deactivate_super+0xb1/0xf0 fs/super.c:505 1 lock held by syz-executor/8732: #0: ffff8880347d00e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880347d00e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880347d00e0 (&type->s_umount_key#52){+.+.}-{3:3}, at: deactivate_super+0xb1/0xf0 fs/super.c:505 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc5-syzkaller-00181-g6c52d4da1c74 #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+0x23d/0x360 lib/dump_stack.c:120 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x194/0x2f0 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+0xfe4/0x1030 kernel/hung_task.c:379 kthread+0x2ec/0x380 kernel/kthread.c:389 ret_from_fork+0x47/0x80 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: 11 Comm: kworker/u8:0 Not tainted 6.12.0-rc5-syzkaller-00181-g6c52d4da1c74 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events_unbound quota_release_workfn RIP: 0010:io_serial_out+0x7a/0xc0 drivers/tty/serial/8250/8250_port.c:413 Code: fc 89 e9 41 d3 e7 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 10 2c fd fc 44 03 3b 44 89 f0 44 89 fa ee <5b> 41 5c 41 5e 41 5f 5d c3 cc cc cc cc 89 e9 80 e1 07 38 c1 7c a7 RSP: 0018:ffffc900001070d0 EFLAGS: 00000002 RAX: 0000000000000039 RBX: ffffffff99ee1da0 RCX: 0000000000000000 RDX: 00000000000003f8 RSI: 0000000000000000 RDI: 0000000000000020 RBP: 0000000000000000 R08: ffffffff85007fb7 R09: 1ffff110048a9046 R10: dffffc0000000000 R11: ffffffff85007f70 R12: dffffc0000000000 R13: ffffffff99bdeeec R14: 0000000000000039 R15: 00000000000003f8 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005560f4c5d008 CR3: 000000003272a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: serial8250_console_write+0x14e9/0x1ec0 drivers/tty/serial/8250/8250_port.c:3393 console_emit_next_record kernel/printk/printk.c:3092 [inline] console_flush_all+0x865/0xea0 kernel/printk/printk.c:3180 __console_flush_and_unlock kernel/printk/printk.c:3239 [inline] console_unlock+0x14b/0x3b0 kernel/printk/printk.c:3279 vprintk_emit+0x72c/0xa10 kernel/printk/printk.c:2407 _printk+0xd1/0x120 kernel/printk/printk.c:2432 __ocfs2_abort+0x139/0x230 fs/ocfs2/super.c:2582 ocfs2_start_trans+0x61d/0x6f0 fs/ocfs2/journal.c:360 ocfs2_release_dquot+0x470/0xc30 fs/ocfs2/quota_global.c:761 quota_release_workfn+0x39b/0x650 fs/quota/dquot.c:839 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa5f/0x1830 kernel/workqueue.c:3310 worker_thread+0xa27/0xf70 kernel/workqueue.c:3391 kthread+0x2ec/0x380 kernel/kthread.c:389 ret_from_fork+0x47/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244