Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 UID: 0 PID: 1030 Comm: kworker/u4:6 Not tainted 6.12.0-rc4-syzkaller-00047-gc2ee9f594da8 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: events_unbound netfs_write_collection_worker
RIP: 0010:folioq_folio include/linux/folio_queue.h:277 [inline]
RIP: 0010:netfs_writeback_unlock_folios fs/netfs/write_collect.c:107 [inline]
RIP: 0010:netfs_collect_write_results fs/netfs/write_collect.c:493 [inline]
RIP: 0010:netfs_write_collection_worker+0x16cc/0x4950 fs/netfs/write_collect.c:551
Code: 23 06 00 00 e8 b5 da 4b ff 44 89 64 24 1c 48 89 9c 24 98 00 00 00 49 8d 5c df 08 48 89 d8 48 c1 e8 03 48 89 84 24 b0 00 00 00 <42> 80 3c 28 00 74 08 48 89 df e8 f5 9f b5 ff 4c 89 7c 24 10 48 89
RSP: 0018:ffffc900022a7940 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: ffff88803549c880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000001f
RBP: ffffc900022a7bb0 R08: ffffffff8248fd1c R09: 1ffffffff2039fdd
R10: dffffc0000000000 R11: fffffbfff2039fde R12: 000000000000002c
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd1ff407ed8 CR3: 00000000411e0000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	23 06                	and    (%rsi),%eax
   2:	00 00                	add    %al,(%rax)
   4:	e8 b5 da 4b ff       	call   0xff4bdabe
   9:	44 89 64 24 1c       	mov    %r12d,0x1c(%rsp)
   e:	48 89 9c 24 98 00 00 	mov    %rbx,0x98(%rsp)
  15:	00
  16:	49 8d 5c df 08       	lea    0x8(%r15,%rbx,8),%rbx
  1b:	48 89 d8             	mov    %rbx,%rax
  1e:	48 c1 e8 03          	shr    $0x3,%rax
  22:	48 89 84 24 b0 00 00 	mov    %rax,0xb0(%rsp)
  29:	00
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 f5 9f b5 ff       	call   0xffb5a02e
  39:	4c 89 7c 24 10       	mov    %r15,0x10(%rsp)
  3e:	48                   	rex.W
  3f:	89                   	.byte 0x89