BUG: unable to handle page fault for address: ffffffff00000000
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 9a90067 P4D 9a90067 PUD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 21885 Comm: kworker/1:19 Not tainted 5.9.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events kfree_rcu_work
RIP: 0010:__hlist_del include/linux/list.h:829 [inline]
RIP: 0010:hlist_del include/linux/list.h:843 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:972 [inline]
RIP: 0010:debug_check_no_obj_freed+0x196/0x41c lib/debugobjects.c:998
Code: 89 f8 48 c1 e8 03 42 80 3c 38 00 0f 85 f0 01 00 00 49 8b 40 08 48 89 c1 48 c1 e9 03 42 80 3c 39 00 0f 85 ee 01 00 00 48 85 ed <48> 89 28 74 1a 48 8d 7d 08 48 89 f9 48 c1 e9 03 42 80 3c 39 00 0f
RSP: 0000:ffffc90006187b68 EFLAGS: 00010046
RAX: ffffffff00000000 RBX: ffff8880a76cff80 RCX: 1fffffffe0000000
RDX: 1ffffffff19748da RSI: 0000000000000004 RDI: ffff88800017f938
RBP: 0000000000000000 R08: ffff88800017f930 R09: ffff8880a76cff80
R10: fffff52000c30f5b R11: 000000000000016e R12: 0000000000000001
R13: dead000000000122 R14: dead000000000100 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff00000000 CR3: 00000000a6291000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kmem_cache_free_bulk+0xbf/0x1c0 mm/slab.c:3718
 kfree_bulk include/linux/slab.h:411 [inline]
 kfree_rcu_work+0x4ef/0x9a0 kernel/rcu/tree.c:3150
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Modules linked in:
CR2: ffffffff00000000
---[ end trace f12d31b89330de88 ]---
RIP: 0010:__hlist_del include/linux/list.h:829 [inline]
RIP: 0010:hlist_del include/linux/list.h:843 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:972 [inline]
RIP: 0010:debug_check_no_obj_freed+0x196/0x41c lib/debugobjects.c:998
Code: 89 f8 48 c1 e8 03 42 80 3c 38 00 0f 85 f0 01 00 00 49 8b 40 08 48 89 c1 48 c1 e9 03 42 80 3c 39 00 0f 85 ee 01 00 00 48 85 ed <48> 89 28 74 1a 48 8d 7d 08 48 89 f9 48 c1 e9 03 42 80 3c 39 00 0f
RSP: 0000:ffffc90006187b68 EFLAGS: 00010046
RAX: ffffffff00000000 RBX: ffff8880a76cff80 RCX: 1fffffffe0000000
RDX: 1ffffffff19748da RSI: 0000000000000004 RDI: ffff88800017f938
RBP: 0000000000000000 R08: ffff88800017f930 R09: ffff8880a76cff80
R10: fffff52000c30f5b R11: 000000000000016e R12: 0000000000000001
R13: dead000000000122 R14: dead000000000100 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff00000000 CR3: 00000000a6291000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400