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: 2 UID: 0 PID: 1134 Comm: kworker/u32:6 Not tainted 6.13.0-rc3-syzkaller-00136-g8faabc041a00 #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+0x1cd1/0x47d0 fs/netfs/write_collect.c:551
Code: 39 f3 0f 83 37 04 00 00 e8 6c 36 54 ff 44 8b 6c 24 08 41 83 fd 1e 0f 87 79 23 00 00 4a 8d 44 ed 08 48 89 44 24 30 48 c1 e8 03 <42> 80 3c 38 00 0f 85 e4 23 00 00 4a 8b 5c ed 08 48 89 df e8 c7 d4
RSP: 0018:ffffc900069f7ae8 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000005 RCX: ffffffff824515da
RDX: ffff888024b2a440 RSI: ffffffff82451884 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: ffff8880654e0980
R10: 0000000000000000 R11: 0000000000000b8f R12: ffff8880654e0880
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88802b600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000c3a3b8f CR3: 0000000066114000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 process_one_work+0x958/0x1b30 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 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:
---[ end trace 0000000000000000 ]---
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+0x1cd1/0x47d0 fs/netfs/write_collect.c:551
Code: 39 f3 0f 83 37 04 00 00 e8 6c 36 54 ff 44 8b 6c 24 08 41 83 fd 1e 0f 87 79 23 00 00 4a 8d 44 ed 08 48 89 44 24 30 48 c1 e8 03 <42> 80 3c 38 00 0f 85 e4 23 00 00 4a 8b 5c ed 08 48 89 df e8 c7 d4
RSP: 0018:ffffc900069f7ae8 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000005 RCX: ffffffff824515da
RDX: ffff888024b2a440 RSI: ffffffff82451884 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: ffff8880654e0980
R10: 0000000000000000 R11: 0000000000000b8f R12: ffff8880654e0880
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88802b700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f7454230 CR3: 000000002a5f6000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	39 f3                	cmp    %esi,%ebx
   2:	0f 83 37 04 00 00    	jae    0x43f
   8:	e8 6c 36 54 ff       	call   0xff543679
   d:	44 8b 6c 24 08       	mov    0x8(%rsp),%r13d
  12:	41 83 fd 1e          	cmp    $0x1e,%r13d
  16:	0f 87 79 23 00 00    	ja     0x2395
  1c:	4a 8d 44 ed 08       	lea    0x8(%rbp,%r13,8),%rax
  21:	48 89 44 24 30       	mov    %rax,0x30(%rsp)
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	0f 85 e4 23 00 00    	jne    0x2419
  35:	4a 8b 5c ed 08       	mov    0x8(%rbp,%r13,8),%rbx
  3a:	48 89 df             	mov    %rbx,%rdi
  3d:	e8                   	.byte 0xe8
  3e:	c7                   	(bad)
  3f:	d4                   	(bad)