!!!! css_free_rwork_fn(ffff8881220c1000) ctr = 48
!!!! css_free_rwork_fn(ffff88811375b400) ctr = 49
!!!! css_free_rwork_fn(ffff8881220c3400) ctr = 50
------------[ cut here ]------------
kernel BUG at kernel/cgroup/cgroup.c:5056!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 372 Comm: kworker/1:2 Not tainted 5.10.110-syzkaller-00001-g2c30a75d9bd7 #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:ffffc90000bd7ce0 EFLAGS: 00010293
RAX: ffffffff8165fce6 RBX: 0000000000000032 RCX: ffff88811cfc13c0
RDX: 0000000000000000 RSI: 0000000000000032 RDI: 0000000000000032
RBP: ffffc90000bd7d18 R08: ffffffff8165f6af R09: 0000000000000003
R10: fffff5200017aeed R11: 1ffff9200017aeec R12: ffff88810ffd4000
R13: dffffc0000000000 R14: ffff8881220c3400 R15: ffffffff85fb4ec0
FS:  0000000000000000(0000) GS:ffff8881f7300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2972589718 CR3: 000000010bbbd000 CR4: 00000000003506a0
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 80c121a6d881675f ]---
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:ffffc90000bd7ce0 EFLAGS: 00010293

RAX: ffffffff8165fce6 RBX: 0000000000000032 RCX: ffff88811cfc13c0
RDX: 0000000000000000 RSI: 0000000000000032 RDI: 0000000000000032
RBP: ffffc90000bd7d18 R08: ffffffff8165f6af R09: 0000000000000003
R10: fffff5200017aeed R11: 1ffff9200017aeec R12: ffff88810ffd4000
R13: dffffc0000000000 R14: ffff8881220c3400 R15: ffffffff85fb4ec0
FS:  0000000000000000(0000) GS:ffff8881f7300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2972588ff8 CR3: 0000000112c2e000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400