Oops: general protection fault, probably for non-canonical address 0xdffffc0000000023: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000118-0x000000000000011f]
CPU: 1 UID: 0 PID: 5976 Comm: kworker/u8:9 Not tainted 6.15.0-rc5-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
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 lib/iov_iter.c:644 [inline]
RIP: 0010:iov_iter_revert+0x2ec/0x5a0 lib/iov_iter.c:611
Code: ec 41 83 fd 1e 0f 87 3b 02 00 00 4b 8d bc 26 00 01 00 00 48 b9 00 00 00 00 00 fc ff df 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 <0f> b6 04 08 38 d0 7f 08 84 c0 0f 85 02 02 00 00 47 0f b6 bc 26 00
RSP: 0018:ffffc90004c27950 EFLAGS: 00010206
RAX: 0000000000000023 RBX: 0000000000000001 RCX: dffffc0000000000
RDX: 0000000000000006 RSI: ffffffff84ceb5d0 RDI: 000000000000011e
RBP: ffffc90004c27a78 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88805b52422c R12: 000000000000001e
R13: 000000000000001e R14: 0000000000000000 R15: ffff88805b5240a8
FS:  0000000000000000(0000) GS:ffff888124adf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2be541 CR3: 0000000036c9b000 CR4: 00000000003526f0
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+0x166d/0x1a50 fs/netfs/write_retry.c:231
 netfs_collect_write_results fs/netfs/write_collect.c:352 [inline]
 netfs_write_collection_worker+0x23fd/0x3830 fs/netfs/write_collect.c:374
 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 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 lib/iov_iter.c:644 [inline]
RIP: 0010:iov_iter_revert+0x2ec/0x5a0 lib/iov_iter.c:611
Code: ec 41 83 fd 1e 0f 87 3b 02 00 00 4b 8d bc 26 00 01 00 00 48 b9 00 00 00 00 00 fc ff df 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 <0f> b6 04 08 38 d0 7f 08 84 c0 0f 85 02 02 00 00 47 0f b6 bc 26 00
RSP: 0018:ffffc90004c27950 EFLAGS: 00010206
RAX: 0000000000000023 RBX: 0000000000000001 RCX: dffffc0000000000
RDX: 0000000000000006 RSI: ffffffff84ceb5d0 RDI: 000000000000011e
RBP: ffffc90004c27a78 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88805b52422c R12: 000000000000001e
R13: 000000000000001e R14: 0000000000000000 R15: ffff88805b5240a8
FS:  0000000000000000(0000) GS:ffff888124adf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f212ef20f98 CR3: 000000000e180000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	ec                   	in     (%dx),%al
   1:	41 83 fd 1e          	cmp    $0x1e,%r13d
   5:	0f 87 3b 02 00 00    	ja     0x246
   b:	4b 8d bc 26 00 01 00 	lea    0x100(%r14,%r12,1),%rdi
  12:	00
  13:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  1a:	fc ff df
  1d:	48 89 f8             	mov    %rdi,%rax
  20:	48 89 fa             	mov    %rdi,%rdx
  23:	48 c1 e8 03          	shr    $0x3,%rax
  27:	83 e2 07             	and    $0x7,%edx
* 2a:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax <-- trapping instruction
  2e:	38 d0                	cmp    %dl,%al
  30:	7f 08                	jg     0x3a
  32:	84 c0                	test   %al,%al
  34:	0f 85 02 02 00 00    	jne    0x23c
  3a:	47                   	rex.RXB
  3b:	0f                   	.byte 0xf
  3c:	b6 bc                	mov    $0xbc,%dh
  3e:	26                   	es