Freezing user space processes
------------[ cut here ]------------
debug_locks && p->lockdep_depth
WARNING: kernel/freezer.c:139 at __set_task_frozen+0x211/0x2e0 kernel/freezer.c:139, CPU#0: syz.3.57/6033
Modules linked in:
CPU: 0 UID: 0 PID: 6033 Comm: syz.3.57 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__set_task_frozen+0x211/0x2e0 kernel/freezer.c:139
Code: 0f b6 04 02 84 c0 74 09 3c 03 7f 05 e8 58 b3 89 00 8b ab a0 0b 00 00 31 ff 89 ee e8 f9 42 16 00 85 ed 74 09 e8 80 48 16 00 90 <0f> 0b 90 e8 77 48 16 00 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48
RSP: 0018:ffffc90005f2f998 EFLAGS: 00010087
RAX: 0000000000028d11 RBX: ffff888032f9a580 RCX: ffffc900048f1000
RDX: 0000000000080000 RSI: ffffffff81f5fc50 RDI: ffff88802ab32580
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000000 R12: ffff888032f9a598
R13: 0000000000000002 R14: dffffc0000000000 R15: ffff888032f9b000
FS:  00007f383c1f66c0(0000) GS:ffff8880d5b4f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c7b5762e50 CR3: 0000000054b8b000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 task_call_func+0x169/0x380 kernel/sched/core.c:4518
 __freeze_task kernel/freezer.c:150 [inline]
 freeze_task+0x151/0x270 kernel/freezer.c:169
 try_to_freeze_tasks+0x243/0x680 kernel/power/process.c:54
 freeze_processes+0xf2/0x1e0 kernel/power/process.c:137
 suspend_freeze_processes kernel/power/power.h:281 [inline]
 suspend_prepare kernel/power/suspend.c:387 [inline]
 enter_state kernel/power/suspend.c:609 [inline]
 pm_suspend kernel/power/suspend.c:644 [inline]
 pm_suspend+0x32c/0x7b0 kernel/power/suspend.c:636
 state_store+0x101/0x240 kernel/power/main.c:819
 kobj_attr_store+0x58/0x80 lib/kobject.c:842
 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6af/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f383df9e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f383c1f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f383e225fa0 RCX: 00007f383df9e159
RDX: 0000000000000006 RSI: 0000200000000900 RDI: 0000000000000003
RBP: 00007f383e03506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f383e226038 R14: 00007f383e225fa0 R15: 00007ffe0fbd7508
 </TASK>