INFO: task syz.5.2658:24370 blocked for more than 143 seconds.
      Tainted: G S                  syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.2658      state:D stack:25928 pid:24370 tgid:24369 ppid:24044  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6ba/0x920
 down_read+0x9c/0x330
 super_lock+0x2d6/0x3d0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x538/0x9a0
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f715e79e019
RSP: 002b:00007f715f5be028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f715ea25fa0 RCX: 00007f715e79e019
RDX: 0000000000000000 RSI: 0000200000000000 RDI: ffffffff80000802
RBP: 00007f715e83500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000540 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f715ea26038 R14: 00007f715ea25fa0 R15: 00007ffdd0574548
 </TASK>
INFO: task syz.1.2713:24676 blocked for more than 143 seconds.
      Tainted: G S                  syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.2713      state:D stack:28808 pid:24676 tgid:24675 ppid:24194  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6ba/0x920
 down_read+0x9c/0x330
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x120/0x240
 __ia32_sys_sync+0xa0/0x120
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf4699e019
RSP: 002b:00007fcf44bf6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fcf46c25fa0 RCX: 00007fcf4699e019
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fcf46c25fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcf46c26038 R14: 00007fcf46c25fa0 R15: 00007ffc4a8d0dd8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5440:
 #0: ffff8881099740a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
2 locks held by syz-executor/18443:
1 lock held by syz-executor/21705:
 #0: ffffffff8eb5ff68 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by syz.5.2658/24370:
 #0: ffff88810f3b40d8 (&type->s_umount_key#68){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.2713/24676:
 #0: ffff88810f3b40d8 (&type->s_umount_key#68){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.2929/26034:
 #0: ffff88810f3b40d8 (&type->s_umount_key#68){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
3 locks held by syz.5.3154/27240:
1 lock held by syz.8.3155/27254:
 #0: ffff88812103b160 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2d/0x160

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Tainted: G S                  syzkaller #0 PREEMPT(full) 
Tainted: [S]=CPU_OUT_OF_SPEC
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/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 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: 27240 Comm: syz.5.3154 Tainted: G S                  syzkaller #0 PREEMPT(full) 
Tainted: [S]=CPU_OUT_OF_SPEC
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0033:0x7f6811855264
Code: 00 00 00 0f 1f 00 48 39 f0 72 1b 4d 8b 07 49 89 c1 49 29 f1 47 0f b6 0c 08 45 84 c9 74 08 45 88 0c 00 49 8b 47 10 48 83 c0 01 <49> 89 47 10 83 e9 01 73 d3 41 81 fe 00 01 00 00 0f 85 c6 fe ff ff
RSP: 002b:00007f68128c9470 EFLAGS: 00000206
RAX: 0000000000b81388 RBX: 00007f68128c9530 RCX: 00000000000000ee
RDX: 0000000000000005 RSI: 0000000000000001 RDI: 00007f68128c95d0
RBP: 0000000000000102 R08: 00007f6807600000 R09: 0000000000000000
R10: 0000000000000000 R11: 00007f68128c9540 R12: 0000000000000001
R13: 00007f6811a54fa0 R14: 0000000000000000 R15: 00007f68128c95d0
FS:  00007f68128ca6c0 GS:  0000000000000000
