INFO: task syz.1.258:7811 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.258       state:D stack:27688 pid:7811  tgid:7809  ppid:7546   task_flags:0x400040 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
 __iterate_supers+0x126/0x290
 ksys_sync+0x94/0x150
 __ia32_sys_sync+0xe/0x20
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f11e818ebe9
RSP: 002b:00007f11e900f038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f11e83b5fa0 RCX: 00007f11e818ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f11e83b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f11e83b6038 R14: 00007f11e83b5fa0 R15: 00007ffcf2212438
 </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: 10901 Comm: modprobe 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:__virt_addr_valid+0x16f/0x5c0
Code: 48 c1 e8 03 42 80 3c 28 00 74 0c 48 c7 c7 00 80 b1 99 e8 94 8b ae 00 48 8b 05 0d f7 3c 18 48 85 c0 74 40 4e 8d 3c f8 4c 89 f8 <48> c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 6e 8b ae 00 4d 8b 3f
RSP: 0018:ffffc9000480f768 EFLAGS: 00000286
RAX: ffff88813ffef400 RBX: 0000000069e47000 RCX: ffff88806aa03980
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000000000000000
RBP: 000000000021a310 R08: 00000000273245ba R09: 00000000110186bf
R10: 000000000000000c R11: ffffffff81ac3810 R12: 0000000000001000
R13: dffffc0000000000 R14: 000000000000000d R15: ffff88813ffef400
FS:  0000000000000000(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbe91a97020 CR3: 00000000614b6000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 kasan_addr_to_slab+0xf/0x90
 kasan_record_aux_stack+0xf/0xd0
 kmem_cache_free+0x2f6/0x400
 __fput_deferred+0x227/0x390
 fput_close+0x119/0x200
 path_openat+0x313c/0x3830
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbe91ab4a46
Code: 10 00 00 00 44 8b 54 24 e0 48 89 44 24 c0 48 8d 44 24 d0 48 89 44 24 c8 44 89 c2 4c 89 ce bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 0c f7 d8 89 05 0a 48 01 00 48 83 c8 ff c3 31
RSP: 002b:00007ffdae9e00b8 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffdae9e0318 RCX: 00007fbe91ab4a46
RDX: 0000000000080000 RSI: 00007ffdae9e0130 RDI: 00000000ffffff9c
RBP: 00007ffdae9e0120 R08: 0000000000080000 R09: 00007ffdae9e0130
R10: 0000000000000000 R11: 0000000000000287 R12: 00007ffdae9e0130
R13: 0000000000000003 R14: 00007ffdae9e02ff R15: 00000000ffffffff
 </TASK>
