INFO: task syz.0.520:11404 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.520       state:D stack:28760 pid:11404 tgid:11398 ppid:10339  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x360
 cgroup_lock_and_drain_offline+0x51a/0x650
 cgroup_kn_lock_live+0x120/0x230
 cgroup_subtree_control_write+0x4b5/0x1080
 cgroup_file_write+0x331/0x8f0
 kernfs_fop_write_iter+0x3a4/0x540
 vfs_write+0x612/0xba0
 ksys_write+0x150/0x270
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f94f999ce59
RSP: 002b:00007f94fa7c9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f94f9c16090 RCX: 00007f94f999ce59
RDX: 0000000000000006 RSI: 0000200000000180 RDI: 000000000000000a
RBP: 00007f94f9a32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f94f9c16128 R14: 00007f94f9c16090 R15: 00007ffe0f745958
 </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+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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 15724 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:__srcu_check_read_flavor+0x8f/0x260
Code: e8 26 3e 89 00 49 8b 2c 24 4c 89 7c 24 08 4d 8d 24 2f 49 83 c4 20 4c 89 e0 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 19 01 00 00 <41> 8b 04 24 49 83 c6 10 4d 89 f7 49 c1 ef 03 43 0f b6 0c 2f 84 c9
RSP: 0018:ffffc90006faf7b8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000006faf802
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffffffff8e8337a0
RBP: ffffffff933f7500 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1d066c4 R12: ffff88823c624520
R13: dffffc0000000000 R14: ffffffff8e8337a0 R15: ffff8882a922d000
FS:  0000555585304500(0000) GS:ffff8882a922d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000025000 CR3: 00000001786d8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 console_flush_all+0x10c/0xaf0
 console_unlock+0xd1/0x1c0
 vprintk_emit+0x485/0x560
 _printk+0xdd/0x130
 xfs_printk_level+0x1ae/0x2c0
 xfs_fs_put_super+0x55/0x160
 generic_shutdown_super+0x13d/0x2d0
 kill_block_super+0x44/0x90
 xfs_kill_sb+0x15/0x50
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x3d3/0x460
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0x1fa/0x730
 do_syscall_64+0x353/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fea3a79e097
Code: a2 c7 05 5c 06 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc235c4568 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fea3a8322ca RCX: 00007fea3a79e097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc235c4620
RBP: 00007ffc235c4620 R08: 00007ffc235c5620 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc235c56b0
R13: 00007fea3a8322ca R14: 0000000000056d61 R15: 00007ffc235c56f0
 </TASK>
