INFO: task syz.3.3110:10938 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.3110      state:D stack:22184 pid:10938 tgid:10937 ppid:6350   task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x5fd/0x8f0
 down_read+0x98/0x2e0
 super_lock+0x2a9/0x3b0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x4da/0x950
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7a39d8ebe9
RSP: 002b:00007f7a3aba0038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f7a39fb5fa0 RCX: 00007f7a39d8ebe9
RDX: 000000000000ee00 RSI: 0000200000000040 RDI: ffffffff80000800
RBP: 00007f7a39e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7a39fb6038 R14: 00007f7a39fb5fa0 R15: 00007ffd8d930d58
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 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+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 47 Comm: kworker/1:1 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
Workqueue: events drain_vmap_area_work
RIP: 0010:lock_release+0x5c/0x3e0
Code: f8 08 0f 83 9a 02 00 00 89 c0 48 0f a3 05 5c 17 06 0e 73 16 e8 45 f1 08 00 84 c0 75 0d f6 05 7e fd ef 0d 01 0f 84 ad 02 00 00 <83> 3d 7d 48 06 0e 00 0f 84 44 02 00 00 65 8b 05 30 24 03 11 85 c0
RSP: 0018:ffffc9000075f290 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff90414401 RCX: 69a2033f4b1ee400
RDX: ffffc9000075f401 RSI: ffffffff8be33660 RDI: ffffffff8be33620
RBP: dffffc0000000000 R08: ffffc9000075f670 R09: 0000000000000000
R10: ffffc9000075f418 R11: fffff520000ebe85 R12: ffffc9000075f680
R13: ffffffff8172c195 R14: ffffffff8e139ea0 R15: ffffffff8172c195
FS:  0000000000000000(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0cf17ff000 CR3: 000000002a7cc000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 unwind_next_frame+0x19a9/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 save_stack+0xf5/0x1f0
 __reset_page_owner+0x71/0x1f0
 __free_frozen_pages+0xbc4/0xd30
 kasan_depopulate_vmalloc_pte+0x74/0xa0
 __apply_to_page_range+0xb92/0x1380
 kasan_release_vmalloc+0xa2/0xd0
 purge_vmap_node+0x214/0x8f0
 __purge_vmap_area_lazy+0x7a4/0xb40
 drain_vmap_area_work+0x27/0x40
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
