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#2: syz.3.328/6889
Modules linked in:
CPU: 2 UID: 0 PID: 6889 Comm: syz.3.328 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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 28 c6 90 00 8b ab a0 0b 00 00 31 ff 89 ee e8 b9 66 16 00 85 ed 74 09 e8 40 6c 16 00 90 <0f> 0b 90 e8 37 6c 16 00 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48
RSP: 0018:ffffc90005f4f998 EFLAGS: 00010083
RAX: 0000000000011c7f RBX: ffff8880288a0000 RCX: ffffc90007b91000
RDX: 0000000000080000 RSI: ffffffff81f814c0 RDI: 0000000000000005
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000000 R12: ffff8880288a0018
R13: 0000000000000002 R14: dffffc0000000000 R15: ffff8880288a0a80
FS:  00007f51e50096c0(0000) GS:ffff8880d4673000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb1aa895ff8 CR3: 000000003ca94000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 task_call_func+0x169/0x380 kernel/sched/core.c:4569
 __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:391 [inline]
 enter_state kernel/power/suspend.c:613 [inline]
 pm_suspend kernel/power/suspend.c:648 [inline]
 pm_suspend+0x32c/0x7b0 kernel/power/suspend.c:640
 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:575 [inline]
 vfs_write+0x6af/0x1040 fs/read_write.c:667
 ksys_write+0x12a/0x250 fs/read_write.c:719
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x7b0 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f51e41a8f19
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:00007f51e5009028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f51e4425fa0 RCX: 00007f51e41a8f19
RDX: 0000000000000004 RSI: 0000200000000240 RDI: 0000000000000007
RBP: 00007f51e4237f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f51e4426038 R14: 00007f51e4425fa0 R15: 00007ffd276d5218
 </TASK>