syzbot

BUG: kernel NULL pointer dereference, address: 000000000000001c
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 63c18067 P4D 63c18067 PUD 5e6ee067 PMD 0 
Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 3 PID: 1870 Comm: kworker/3:2 Not tainted 6.10.0-rc5-syzkaller-00018-g55027e689933 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: slub_flushwq flush_cpu_slab
RIP: 0010:__put_partials+0x84/0x170 mm/slub.c:2967
Code: 7b 50 4c 89 6d 18 48 89 55 10 4d 89 7d 00 48 89 ef e8 90 b4 ff ff f0 80 48 01 02 4d 85 e4 0f 84 aa 00 00 00 48 89 df 4c 89 e5 <4d> 8b 64 24 10 48 8b 45 00 48 83 f8 ff 74 69 48 8b 45 00 48 8b 0c
RSP: 0018:ffffc9000d2dfc80 EFLAGS: 00010246
RAX: 0000000000000006 RBX: ffff88801c655500 RCX: 1ffffffff28411df
RDX: 0000000000000000 RSI: 000000000000000c RDI: 0000000000000000
RBP: 000000000000000c R08: 0000000000000001 R09: fffffbfff283ea5e
R10: ffffffff941f52f7 R11: 0000000000000002 R12: 000000000000000c
R13: ffff88802c33db00 R14: 0000000000000000 R15: ffffc9000d2dfd80
FS:  0000000000000000(0000) GS:ffff88802c300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000001c CR3: 000000005b164000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 process_one_work+0x958/0x1ad0 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
CR2: 000000000000001c
---[ end trace 0000000000000000 ]---
RIP: 0010:__put_partials+0x84/0x170 mm/slub.c:2967
Code: 7b 50 4c 89 6d 18 48 89 55 10 4d 89 7d 00 48 89 ef e8 90 b4 ff ff f0 80 48 01 02 4d 85 e4 0f 84 aa 00 00 00 48 89 df 4c 89 e5 <4d> 8b 64 24 10 48 8b 45 00 48 83 f8 ff 74 69 48 8b 45 00 48 8b 0c
RSP: 0018:ffffc9000d2dfc80 EFLAGS: 00010246
RAX: 0000000000000006 RBX: ffff88801c655500 RCX: 1ffffffff28411df
RDX: 0000000000000000 RSI: 000000000000000c RDI: 0000000000000000
RBP: 000000000000000c R08: 0000000000000001 R09: fffffbfff283ea5e
R10: ffffffff941f52f7 R11: 0000000000000002 R12: 000000000000000c
R13: ffff88802c33db00 R14: 0000000000000000 R15: ffffc9000d2dfd80
FS:  0000000000000000(0000) GS:ffff88802c300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000001c CR3: 000000005b164000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	7b 50                	jnp    0x52
   2:	4c 89 6d 18          	mov    %r13,0x18(%rbp)
   6:	48 89 55 10          	mov    %rdx,0x10(%rbp)
   a:	4d 89 7d 00          	mov    %r15,0x0(%r13)
   e:	48 89 ef             	mov    %rbp,%rdi
  11:	e8 90 b4 ff ff       	call   0xffffb4a6
  16:	f0 80 48 01 02       	lock orb $0x2,0x1(%rax)
  1b:	4d 85 e4             	test   %r12,%r12
  1e:	0f 84 aa 00 00 00    	je     0xce
  24:	48 89 df             	mov    %rbx,%rdi
  27:	4c 89 e5             	mov    %r12,%rbp
* 2a:	4d 8b 64 24 10       	mov    0x10(%r12),%r12 <-- trapping instruction
  2f:	48 8b 45 00          	mov    0x0(%rbp),%rax
  33:	48 83 f8 ff          	cmp    $0xffffffffffffffff,%rax
  37:	74 69                	je     0xa2
  39:	48 8b 45 00          	mov    0x0(%rbp),%rax
  3d:	48                   	rex.W
  3e:	8b                   	.byte 0x8b
  3f:	0c                   	.byte 0xc