INFO: task syz.4.3022:24299 blocked for more than 143 seconds.
      Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.3022      state:D stack:25128 pid:24299 tgid:24298 ppid:24198  task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x872/0xfe0
 down_write+0x1ab/0x1f0
 super_lock+0x25c/0x3b0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x4da/0x950
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f061fd8ebe9
RSP: 002b:00007f0620b7a038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f061ffb5fa0 RCX: 00007f061fd8ebe9
RDX: 0000000000000000 RSI: 0000200000000040 RDI: ffffffff80000301
RBP: 00007f061fe11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f061ffb6038 R14: 00007f061ffb5fa0 R15: 00007ffd23569878
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5670:
 #0: ffff88810a0880a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
5 locks held by kworker/1:3/5901:
 #0: ffff888104baf948 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000437fbc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff888109445198 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4a20
 #3: ffff888132ee7198 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400
 #4: ffff8881318a3160 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400
2 locks held by syz-executor/17604:
 #0: ffff88812e7060e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffff888044100278 (&c->state_lock){++++}-{4:4}, at: __bch2_fs_stop+0xf8/0x900
2 locks held by syz-executor/18786:
 #0: ffff88803fd200e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffff888034380278 (&c->state_lock){++++}-{4:4}, at: __bch2_fs_stop+0xf8/0x900
2 locks held by syz-executor/20644:
 #0: ffff88804688e0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffff888124180278 (&c->state_lock){++++}-{4:4}, at: __bch2_fs_stop+0xf8/0x900
1 lock held by syz.4.3022/24299:
 #0: ffff88803fd200e0 (&type->s_umount_key#49){++++}-{4:4}, at: super_lock+0x25c/0x3b0
1 lock held by syz.0.3109/24672:
 #0: ffff88812e7060e0 (&type->s_umount_key#49){++++}-{4:4}, at: super_lock+0x25c/0x3b0
1 lock held by syz.2.3143/24909:
 #0: ffff88812e7060e0 (&type->s_umount_key#49){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
3 locks held by syz-executor/25867:
 #0: ffff88812db1a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffff888031580278 (&c->state_lock){++++}-{4:4}, at: __bch2_fs_stop+0xf8/0x900
 #2: ffffffff8e13f978 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730
1 lock held by syz.6.3362/26076:
 #0: ffff88804688e0e0 (&type->s_umount_key#49){++++}-{4:4}, at: super_lock+0x2a9/0x3b0

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 25867 Comm: syz-executor Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:io_serial_in+0x77/0xc0
Code: e8 0e 39 71 fc 44 89 f9 d3 e3 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 df a3 d4 fc 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f e9 0a 09 2d 06 cc 44 89 f9 80 e1 07
RSP: 0018:ffffc90003507418 EFLAGS: 00000006
RAX: 1ffffffff33bcc05 RBX: 00000000000003f9 RCX: 0000000000000000
RDX: 00000000000003f9 RSI: 0000000000000000 RDI: 0000000000000020
RBP: ffffc900035075f0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: ffffffff854e7250 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff99de64e0 R15: 0000000000000000
FS:  0000555577b45500(0000) GS:ffff8880b8624000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffec45cfb88 CR3: 00000000465b4000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 serial8250_console_write+0x584/0x1ba0
 console_flush_all+0x728/0xc40
 console_unlock+0xc4/0x270
 vprintk_emit+0x5b7/0x7a0
 __bch2_print+0x176/0x220
 __bch2_fs_read_only+0x271/0x5b0
 bch2_fs_read_only+0x42a/0xb00
 __bch2_fs_stop+0x100/0x900
 generic_shutdown_super+0x135/0x2c0
 bch2_kill_sb+0x41/0x50
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff82238ff17
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffec45d0338 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007ff822411c05 RCX: 00007ff82238ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffec45d03f0
RBP: 00007ffec45d03f0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffec45d1480
R13: 00007ff822411c05 R14: 00000000000d8b26 R15: 00007ffec45d14c0
 </TASK>
