INFO: task syz.6.1302:6508 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.1302      state:D stack:24696 pid:6508  tgid:6507  ppid:4321   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x250
 __ia32_sys_sync+0xa0/0x120
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb8f6b9cdd9
RSP: 002b:00007fb8f7b0b028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fb8f6e15fa0 RCX: 00007fb8f6b9cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fb8f6e15fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb8f6e16038 R14: 00007fb8f6e15fa0 R15: 00007ffd7ad56cc8
 </TASK>
INFO: task syz.0.1320:6619 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1320      state:D stack:27016 pid:6619  tgid:6618  ppid:4584   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x540/0x9e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f39cf19cdd9
RSP: 002b:00007f39d0003028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f39cf415fa0 RCX: 00007f39cf19cdd9
RDX: 0000000000000000 RSI: 0000200000002500 RDI: ffffffff80000400
RBP: 00007f39cf232d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000002540 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f39cf416038 R14: 00007f39cf415fa0 R15: 00007ffe47241588
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5438:
 #0: ffff8881131950a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000346e2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
3 locks held by syz-executor/29467:
1 lock held by syz.6.1302/6508:
 #0: ffff8881166da0d8 (&type->s_umount_key#66){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.1320/6619:
 #0: ffff8881166da0d8 (&type->s_umount_key#66){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.2.1565/14338:
 #0: ffff8881166da0d8 (&type->s_umount_key#66){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.1570/14410:
 #0: ffff8881166da0d8 (&type->s_umount_key#66){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz.3.1596/14740:
 #0: ffff888106bfa0d8 (&type->s_umount_key#65/1){+.+.}-{4:4}, at: alloc_super+0x28c/0xab0
 #1: ffffffff8e963068 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd3/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 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: 14740 Comm: syz.3.1596 Not tainted syzkaller #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:__lock_acquire+0xa54/0x2cf0
Code: c7 c6 cc 0f 0c 8e 67 48 0f b9 3a 90 31 c0 48 83 78 40 00 0f 84 5f 1d 00 00 41 8b 45 20 25 ff 1f 00 00 48 0f a3 05 8c 27 9f 12 <73> 10 48 69 c0 c8 00 00 00 48 8d 80 70 d3 e1 93 eb 32 83 3d 53 b7
RSP: 0018:ffffc9000951f250 EFLAGS: 00000003
RAX: 0000000000000007 RBX: 00000000d080248a RCX: 000000002fd8be6a
RDX: 000000002363ebe0 RSI: 00000000d03da62e RDI: ffff88816b515880
RBP: a73ba8f200000000 R08: ffffffff8238928e R09: ffffffff8e95cd60
R10: dffffc0000000000 R11: fffff94000d70a69 R12: ffff88816b516460
R13: ffff88816b516460 R14: ffff88816b515880 R15: 0000000000000002
FS:  00007fe77269a6c0(0000) GS:ffff88818dc90000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe767762000 CR3: 0000000194b2a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_acquire+0x106/0x350
 lruvec_stat_mod_folio+0x8a/0x3e0
 filemap_unaccount_folio+0x2d4/0x790
 __filemap_remove_folio+0xc5/0x530
 filemap_remove_folio+0xfa/0x3a0
 truncate_inode_folio+0x5d/0x70
 shmem_undo_range+0x42f/0x1660
 shmem_evict_inode+0x289/0xae0
 evict+0x61e/0xb10
 __dentry_kill+0x1a2/0x690
 finish_dput+0xc9/0x480
 __fput+0x691/0xa60
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xed/0x480
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe77175d60e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007fe772699df8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007fe77269a6c0 RCX: 00007fe77175d60e
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016
R13: 00007fe772699ea0 R14: 0000000000005525 R15: 0000200000007a40
 </TASK>
