==================================================================
BUG: KFENCE: out-of-bounds read in iov_iter_revert lib/iov_iter.c:632 [inline]
BUG: KFENCE: out-of-bounds read in iov_iter_revert+0x447/0x5a0 lib/iov_iter.c:609

Out-of-bounds read at 0xffff88823bf2fff8 (8B left of kfence-#151):
 iov_iter_revert lib/iov_iter.c:632 [inline]
 iov_iter_revert+0x447/0x5a0 lib/iov_iter.c:609
 netfs_retry_write_stream fs/netfs/write_collect.c:181 [inline]
 netfs_retry_writes fs/netfs/write_collect.c:361 [inline]
 netfs_collect_write_results fs/netfs/write_collect.c:529 [inline]
 netfs_write_collection_worker+0x3daf/0x4780 fs/netfs/write_collect.c:551
 process_one_work+0x9c8/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c4/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

kfence-#151: 0xffff88823bf30000-0xffff88823bf3001f, size=32, cache=kmalloc-32

allocated by task 10775 on cpu 1 at 1100.749447s (1.018907s ago):
 __kvmalloc_node_noprof+0xad/0x1a0 mm/util.c:658
 netfs_extract_user_iter+0x166/0x620 fs/netfs/iterator.c:55
 netfs_unbuffered_write_iter_locked+0x27d/0xe70 fs/netfs/direct_write.c:71
 netfs_unbuffered_write_iter+0x413/0x6d0 fs/netfs/direct_write.c:193
 v9fs_file_write_iter+0xbf/0x100 fs/9p/vfs_file.c:404
 new_sync_write fs/read_write.c:590 [inline]
 vfs_write+0x6b8/0x1140 fs/read_write.c:683
 ksys_write+0x12f/0x260 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 6361 Comm: kworker/u8:15 Not tainted 6.12.0-rc3-syzkaller-00420-g715ca9dd687f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: events_unbound netfs_write_collection_worker
RIP: 0010:iov_iter_revert lib/iov_iter.c:631 [inline]
RIP: 0010:iov_iter_revert+0x447/0x5a0 lib/iov_iter.c:609
Code: 48 b8 00 00 00 00 00 fc ff df 4d 8d 6e f0 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 09 3c 03 7f 05 e8 0d 4b 62 fd 48 8d 7d 20 <45> 8b 66 f8 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80
RSP: 0018:ffffc9000306fa98 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000121 RCX: ffffffff848bdaf3
RDX: 1ffff110477e5fff RSI: ffffffff848bdda9 RDI: ffffc9000306fc40
RBP: ffffc9000306fc20 R08: 0000000000000001 R09: 0000000000000002
R10: 0000000000000002 R11: ffff888144e96504 R12: 0000000000000002
R13: ffff88823bf2fff0 R14: ffff88823bf30000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88823bf2fff8 CR3: 0000000079432000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 netfs_retry_write_stream fs/netfs/write_collect.c:181 [inline]
 netfs_retry_writes fs/netfs/write_collect.c:361 [inline]
 netfs_collect_write_results fs/netfs/write_collect.c:529 [inline]
 netfs_write_collection_worker+0x3daf/0x4780 fs/netfs/write_collect.c:551
 process_one_work+0x9c8/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c4/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
==================================================================
----------------
Code disassembly (best guess):
   0:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   7:	fc ff df
   a:	4d 8d 6e f0          	lea    -0x10(%r14),%r13
   e:	48 89 fa             	mov    %rdi,%rdx
  11:	48 c1 ea 03          	shr    $0x3,%rdx
  15:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax
  19:	84 c0                	test   %al,%al
  1b:	74 09                	je     0x26
  1d:	3c 03                	cmp    $0x3,%al
  1f:	7f 05                	jg     0x26
  21:	e8 0d 4b 62 fd       	call   0xfd624b33
  26:	48 8d 7d 20          	lea    0x20(%rbp),%rdi
* 2a:	45 8b 66 f8          	mov    -0x8(%r14),%r12d <-- trapping instruction
  2e:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  35:	fc ff df
  38:	48 89 fa             	mov    %rdi,%rdx
  3b:	48 c1 ea 03          	shr    $0x3,%rdx
  3f:	80                   	.byte 0x80