Oops: general protection fault, probably for non-canonical address 0xdffffc0000000023: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000118-0x000000000000011f]
CPU: 0 UID: 0 PID: 1035 Comm: kworker/u4:7 Not tainted 6.15.0-rc1-syzkaller-00246-g900241a5cc15 #0 PREEMPT(full) 
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_order include/linux/folio_queue.h:291 [inline]
RIP: 0010:folioq_folio_size include/linux/folio_queue.h:305 [inline]
RIP: 0010:iov_iter_folioq_revert lib/iov_iter.c:599 [inline]
RIP: 0010:iov_iter_revert+0x2dc/0x5a0 lib/iov_iter.c:644
Code: 74 08 4c 89 ef e8 a4 37 2a fd 4d 8b 6d 00 41 bf 1e 00 00 00 bd 1e 00 00 00 4c 01 ed 48 81 c5 00 01 00 00 48 89 e8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 75 40 0f b6 6d 00 bf 40 00 00 00 89 ee e8 db
RSP: 0018:ffffc90002587630 EFLAGS: 00010203
RAX: 0000000000000023 RBX: ffffc900025877c0 RCX: ffff888000210000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000000011e R08: ffffffff850344d5 R09: ffffffff85034364
R10: 0000000000000004 R11: ffff888000210000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000007 R15: 000000000000001e
FS:  0000000000000000(0000) GS:ffff88808c596000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f80e557e538 CR3: 00000000417f4000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 netfs_retry_write_stream fs/netfs/write_retry.c:44 [inline]
 netfs_retry_writes+0x17f2/0x19d0 fs/netfs/write_retry.c:231
 netfs_collect_write_results fs/netfs/write_collect.c:352 [inline]
 netfs_write_collection_worker+0x2fc0/0x3bf0 fs/netfs/write_collect.c:374
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
 worker_thread+0x870/0xd50 kernel/workqueue.c:3400
 kthread+0x7b7/0x940 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:folioq_folio_order include/linux/folio_queue.h:291 [inline]
RIP: 0010:folioq_folio_size include/linux/folio_queue.h:305 [inline]
RIP: 0010:iov_iter_folioq_revert lib/iov_iter.c:599 [inline]
RIP: 0010:iov_iter_revert+0x2dc/0x5a0 lib/iov_iter.c:644
Code: 74 08 4c 89 ef e8 a4 37 2a fd 4d 8b 6d 00 41 bf 1e 00 00 00 bd 1e 00 00 00 4c 01 ed 48 81 c5 00 01 00 00 48 89 e8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 75 40 0f b6 6d 00 bf 40 00 00 00 89 ee e8 db
RSP: 0018:ffffc90002587630 EFLAGS: 00010203
RAX: 0000000000000023 RBX: ffffc900025877c0 RCX: ffff888000210000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000000011e R08: ffffffff850344d5 R09: ffffffff85034364
R10: 0000000000000004 R11: ffff888000210000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000007 R15: 000000000000001e
FS:  0000000000000000(0000) GS:ffff88808c596000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f80e557e538 CR3: 00000000417f4000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	74 08                	je     0xa
   2:	4c 89 ef             	mov    %r13,%rdi
   5:	e8 a4 37 2a fd       	call   0xfd2a37ae
   a:	4d 8b 6d 00          	mov    0x0(%r13),%r13
   e:	41 bf 1e 00 00 00    	mov    $0x1e,%r15d
  14:	bd 1e 00 00 00       	mov    $0x1e,%ebp
  19:	4c 01 ed             	add    %r13,%rbp
  1c:	48 81 c5 00 01 00 00 	add    $0x100,%rbp
  23:	48 89 e8             	mov    %rbp,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	75 40                	jne    0x73
  33:	0f b6 6d 00          	movzbl 0x0(%rbp),%ebp
  37:	bf 40 00 00 00       	mov    $0x40,%edi
  3c:	89 ee                	mov    %ebp,%esi
  3e:	e8                   	.byte 0xe8
  3f:	db                   	.byte 0xdb