INFO: task syz.0.544:10347 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.544       state:D stack:24608 pid:10347 tgid:10346 ppid:8718   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1585/0x5340
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x290
 __se_sys_quotactl+0x3a7/0x9e0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb0fa59c799
RSP: 002b:00007fb0fb50a028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fb0fa815fa0 RCX: 00007fb0fa59c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000101
RBP: 00007fb0fa632bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb0fa816038 R14: 00007fb0fa815fa0 R15: 00007ffdaba23188
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5632:
 #0: ffff88817146d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
2 locks held by syz-executor/5818:
1 lock held by syz.0.544/10347:
 #0: ffff8881bb3f40e0 (&type->s_umount_key#65){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz-executor/10374:
1 lock held by syz.2.805/12117:
 #0: ffff8881bb3f40e0 (&type->s_umount_key#65){++++}-{4:4}, at: super_lock+0x289/0x3d0
3 locks held by syz.0.1098/14604:
1 lock held by syz.0.1098/14610:
 #0: ffff8881b4d33688 (&sb->s_type->i_mutex_key#16){+.+.}-{4:4}, at: process_measurement+0x451/0x1c80
2 locks held by syz.0.1098/14615:
 #0: ffff8881b46ae420 (sb_writers#5){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x160
 #1: ffff8881b4d33688 (&sb->s_type->i_mutex_key#16){+.+.}-{4:4}, at: shmem_file_write_iter+0x7f/0x120
1 lock held by syz.0.1098/14616:
 #0: ffff8881b4d33688 (&sb->s_type->i_mutex_key#16){+.+.}-{4:4}, at: do_lock_mount+0x2b3/0x960
3 locks held by syz.0.1098/14617:
1 lock held by syz.1.1099/14612:
 #0: ffffffff8e766578 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
2 locks held by syz.3.1100/14614:

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

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+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 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: 14618 Comm: udevadm 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_is_held_type+0x5a/0x150
Code: 4c 8b 2d 11 0b 6e 07 41 83 bd 14 0b 00 00 00 0f 85 bf 00 00 00 89 f5 49 89 fe 9c 41 5c fa 48 c7 c7 8b 09 f1 8d e8 a6 18 00 00 <65> ff 05 8f 50 6e 07 41 83 bd 10 0b 00 00 00 7e 48 4c 89 eb 48 81
RSP: 0018:ffffc9000613f790 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 00000000ffffffff RCX: 0000000000000046
RDX: 0000000000000001 RSI: ffffffff8df1098b RDI: ffffffff8c27aa00
RBP: 00000000ffffffff R08: ffffffff826ef8cc R09: ffffffff8e7602e0
R10: dffffc0000000000 R11: ffffed102c35052d R12: 0000000000000246
R13: ffff888107761d00 R14: ffff8881012ad188 R15: dffffc0000000000
FS:  00007f423cb13c80(0000) GS:ffff88818de6d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd4abe7fc00 CR3: 000000001f6f0000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 kernfs_parent+0x62/0x190
 kernfs_dop_revalidate+0x26d/0x5e0
 lookup_fast+0x253/0x5b0
 link_path_walk+0x720/0x18d0
 path_lookupat+0xe4/0x8c0
 filename_lookup+0x256/0x5d0
 vfs_statx+0xfc/0x200
 vfs_fstatat+0x11b/0x170
 __x64_sys_newfstatat+0x151/0x200
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f423c7165f4
Code: 64 c7 00 09 00 00 00 83 c8 ff c3 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 00 00 00 00 41 89 ca b8 06 01 00 00 0f 05 <45> 31 c0 3d 00 f0 ff ff 76 10 48 8b 15 03 a8 0d 00 f7 d8 41 83 c8
RSP: 002b:00007ffc96882808 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 000055959e263930 RCX: 00007f423c7165f4
RDX: 00007ffc96882818 RSI: 00007ffc96882ca8 RDI: 00000000ffffff9c
RBP: 00007ffc968828a8 R08: 0000000000008280 R09: 0000000000000005
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc96882ca8
R13: 00007ffc96882818 R14: 000055959e263910 R15: 000055959e263a60
 </TASK>
