!!!! css_free_rwork_fn(ffff8881148c8c00) ctr = 49
!!!! css_free_rwork_fn(ffff8881148cac00) ctr = 50
------------[ cut here ]------------
kernel BUG at kernel/cgroup/cgroup.c:5056!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 442 Comm: kworker/0:5 Not tainted 5.10.110-syzkaller-00001-g4773d3aa44b3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: cgroup_destroy css_free_rwork_fn
RIP: 0010:css_free_rwork_fn+0x6d6/0x6e0 kernel/cgroup/cgroup.c:5056
Code: 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 cb 83 40 00 48 8b 7d d0 41 ff 17 e9 18 fc ff ff e8 8a bd 06 00 <0f> 0b 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 55 41 54
RSP: 0018:ffffc90001057ce0 EFLAGS: 00010293
RAX: ffffffff8165fd36 RBX: 0000000000000032 RCX: ffff8881065fcf00
RDX: 0000000000000000 RSI: 0000000000000032 RDI: 0000000000000032
RBP: ffffc90001057d18 R08: ffffffff8165f6ff R09: 0000000000000003
R10: fffff5200020aeed R11: 1ffff9200020aeec R12: ffff88810fd46000
R13: dffffc0000000000 R14: ffff8881148cac00 R15: ffffffff85fb4ec0
FS:  0000000000000000(0000) GS:ffff8881f7200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc163995718 CR3: 000000011f152000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 process_one_work+0x726/0xc10 kernel/workqueue.c:2296
 worker_thread+0xb27/0x1550 kernel/workqueue.c:2442
 kthread+0x349/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Modules linked in:
---[ end trace fb133c1455fd1e41 ]---
RIP: 0010:css_free_rwork_fn+0x6d6/0x6e0 kernel/cgroup/cgroup.c:5056
Code: 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 cb 83 40 00 48 8b 7d d0 41 ff 17 e9 18 fc ff ff e8 8a bd 06 00 <0f> 0b 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 55 41 54
RSP: 0018:ffffc90001057ce0 EFLAGS: 00010293

RAX: ffffffff8165fd36 RBX: 0000000000000032 RCX: ffff8881065fcf00
RDX: 0000000000000000 RSI: 0000000000000032 RDI: 0000000000000032
RBP: ffffc90001057d18 R08: ffffffff8165f6ff R09: 0000000000000003
R10: fffff5200020aeed R11: 1ffff9200020aeec R12: ffff88810fd46000
R13: dffffc0000000000 R14: ffff8881148cac00 R15: ffffffff85fb4ec0
FS:  0000000000000000(0000) GS:ffff8881f7200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f455d776ff8 CR3: 000000011f1a8000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400