INFO: task syz.1.1465:13756 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1465      state:D stack:25512 pid:13756 tgid:13755 ppid:13029  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
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x538/0x9a0
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd805f9e0d9
RSP: 002b:00007fd806edb028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fd806225fa0 RCX: 00007fd805f9e0d9
RDX: ffffffffffffffff RSI: 0000200000000040 RDI: ffffffff80000900
RBP: 00007fd806035024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd806226038 R14: 00007fd806225fa0 R15: 00007ffd14bd01b8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5429:
 #0: ffff888169ec10a0 (&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
3 locks held by syz-executor/10289:
1 lock held by syz.1.1465/13756:
 #0: ffff888115ade0d8 (&type->s_umount_key#96){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.1606/14755:
 #0: ffff888115ade0d8 (&type->s_umount_key#96){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.1607/14797:
 #0: ffff888115ade0d8 (&type->s_umount_key#96){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
3 locks held by syz.6.1960/17224:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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: 159 Comm: kworker/u9:4 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: loop6 loop_workfn
RIP: 0010:native_apic_msr_write+0x39/0x50
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 e9 00 db 5d 0a cc 89 f6 31 d2 e9 f6 0e 9b 03 66 0f 1f 44 00
RSP: 0018:ffffc9000328f8b0 EFLAGS: 00000046
RAX: 0000000000000d55 RBX: ffff888121023c80 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 0000000000000d55 RDI: 0000000000000838
RBP: ffffc9000328f970 R08: ffffffff81b3fb45 R09: 0000000000080000
R10: 0000000000000000 R11: ffffffff8174d530 R12: 0000000000000d55
R13: dffffc0000000000 R14: 0000000010006b5f R15: 0000000000000020
FS:  0000000000000000(0000) GS:ffff88818d952000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f19117eb7c0 CR3: 0000000110570000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lapic_next_event+0x11/0x20
 clockevents_program_event+0x385/0x630
 __hrtimer_rearm_deferred+0x26c/0x420
 irqentry_exit+0x8b7/0x8f0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x70
Code: f8 16 00 00 83 fa 02 75 21 48 8b 91 00 17 00 00 48 8b 32 48 8d 7e 01 8b 89 fc 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 <c3> cc cc cc cc cc 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90
RSP: 0018:ffffc9000328fac8 EFLAGS: 00000293
RAX: ffffffff818f3fca RBX: ffff88810eb65e18 RCX: ffff888102fc9dc0
RDX: 0000000000000000 RSI: ffffffff8e4ae89f RDI: ffff88810eb65e18
RBP: ffffc9000328fce8 R08: ffffffff818f2f90 R09: 0000000000000000
R10: 0000000000000000 R11: ffffc9000328fc40 R12: ffff88810273a118
R13: dffffc0000000000 R14: ffffffff818f2f90 R15: ffff88810eb65e18
 trace_workqueue_execute_start+0x1a/0x1d0
 process_scheduled_works+0xa64/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
