INFO: task syz.3.74:6236 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.74        state:D stack:21208 pid:6236  tgid:6235  ppid:5938   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 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
 __se_sys_quotactl+0x3a7/0x9e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0bf779cdd9
RSP: 002b:00007f0bf85fa028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f0bf7a15fa0 RCX: 00007f0bf779cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000101
RBP: 00007f0bf7832d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0bf7a16038 R14: 00007f0bf7a15fa0 R15: 00007ffc08bf21b8
 </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/5434:
 #0: ffff88811018c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900032b82e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
2 locks held by syz-executor/5616:
6 locks held by kworker/0:6/5688:
 #0: ffff88812103aea0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150
 #1: ffff888121024588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
 #2: ffff888121026118 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x1ae/0xf30
 #3: ffffffff9a6b6710 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x83/0x580
 #4: ffff88812103aea0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150
 #5: ffff888121024588 (psi_seq){-.-.}-{0:0}, at: psi_task_change+0xd4/0x340
3 locks held by kworker/0:7/5721:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc90006c6fc40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffff888169193250 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x202/0x3d0
1 lock held by syz.3.74/6236:
 #0: ffff8881aa84c0d8 (&type->s_umount_key#54){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.2.339/8888:
 #0: ffff8881aa84c0d8 (&type->s_umount_key#54){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.406/9386:
 #0: ffff8881aa84c0d8 (&type->s_umount_key#54){++++}-{4:4}, at: super_lock+0x2d6/0x3d0

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

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: 6887 Comm: syz-executor 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: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 c0 37 36 0a cc 89 f6 31 d2 e9 26 60 7a 03 66 0f 1f 44 00
RSP: 0018:ffffc9000398ef90 EFLAGS: 00000046
RAX: 000000000000b14c RBX: ffff888121023e40 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 000000000000b14c RDI: 0000000000000838
RBP: ffffc9000398f048 R08: ffffffff81b2e285 R09: ffffffff9a48d588
R10: 0000000000000003 R11: ffffffff817446c0 R12: 000000000000b14c
R13: dffffc0000000000 R14: 0000000010000a10 R15: 0000000000000020
FS:  000055555df27500(0000) GS:ffff88818dc8d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1079f456b8 CR3: 00000001123c4000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lapic_next_event+0x11/0x20
 clockevents_program_event+0x385/0x630
 __hrtimer_rearm_deferred+0x270/0x450
 irqentry_exit+0x6d5/0x760
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:check_preemption_disabled+0x1/0xe0
Code: 80 ae 28 8c 48 c7 c6 c0 ae 28 8c eb 1c 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 <41> 57 41 56 53 65 8b 05 87 5f 90 07 65 8b 0d 7c 5f 90 07 f7 c1 ff
RSP: 0018:ffffc9000398f1a0 EFLAGS: 00000283
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff8c28aec0 RDI: ffffffff8c28ae80
RBP: ffffffff823ca66a R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff9400011d6a9 R12: 0000000000000002
R13: ffffffff8e95ce20 R14: 0000000000000000 R15: 0000000000000000
 rcu_is_watching+0x15/0xb0
 lock_acquire+0x5f/0x350
 pfn_valid+0xd6/0x480
 page_table_check_set+0x25/0x510
 copy_pmd_range+0x486a/0x5970
 copy_page_range+0xbe8/0x11f0
 dup_mmap+0xf40/0x1d90
 copy_mm+0x13b/0x4a0
 copy_process+0x1f1c/0x4440
 kernel_clone+0x284/0x8f0
 __x64_sys_clone+0x1b6/0x230
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f10791c5852
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffe7ba13e70 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffe7ba13e70 RCX: 00007f10791c5852
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffe7ba13ffc R08: 0000000000000000 R09: 0000000000000001
R10: 000055555df277d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 000000000003b56f R15: 00007ffe7ba14050
 </TASK>
