FAT-fs (loop7): Unrecognized mount option "P¥‰y["U" or missing value
==================================================================
BUG: KASAN: stack-out-of-bounds in iov_iter_revert lib/iov_iter.c:1144 [inline]
BUG: KASAN: stack-out-of-bounds in iov_iter_revert+0x827/0x8f0 lib/iov_iter.c:1089
Read of size 8 at addr ffff888021a5f7e0 by task syz-executor.1/4143

CPU: 1 PID: 4143 Comm: syz-executor.1 Not tainted 5.10.52 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 print_address_description.constprop.0+0x1c/0x210 mm/kasan/report.c:385
9pnet: Insufficient options for proto=fd
 __kasan_report mm/kasan/report.c:545 [inline]
 kasan_report.cold+0x37/0x7c mm/kasan/report.c:562
 iov_iter_revert lib/iov_iter.c:1144 [inline]
 iov_iter_revert+0x827/0x8f0 lib/iov_iter.c:1089
 io_write+0x651/0xdf0 fs/io_uring.c:3613
 io_issue_sqe+0x1b40/0x3c40 fs/io_uring.c:6014
 __io_queue_sqe+0x204/0xd00 fs/io_uring.c:6337
 io_queue_sqe+0x5bc/0x1020 fs/io_uring.c:6403
 io_submit_sqe fs/io_uring.c:6472 [inline]
 io_submit_sqes+0x130d/0x2310 fs/io_uring.c:6700
 __do_sys_io_uring_enter+0x1092/0x1910 fs/io_uring.c:9092
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x466609
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff0423a6188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609
RDX: 0000000000000000 RSI: 00000000000058ab RDI: 0000000000000003
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffe1e85bddf R14: 00007ff0423a6300 R15: 0000000000022000

The buggy address belongs to the page:
page:00000000ac04954e refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x21a5f
flags: 0x100000000000000()
raw: 0100000000000000 0000000000000000 ffffea00008697c8 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

addr ffff888021a5f7e0 is located in stack of task syz-executor.1/4143 at offset 152 in frame:
 io_write+0x0/0xdf0 fs/io_uring.c:3480

this frame has 3 objects:
 [48, 56) 'iovec'
 [80, 120) '__iter'
 [160, 288) 'inline_vecs'

Memory state around the buggy address:
 ffff888021a5f680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888021a5f700: 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00
>ffff888021a5f780: f2 f2 f2 00 00 00 00 00 f2 f2 f2 f2 f2 00 00 00
                                                       ^
 ffff888021a5f800: 00 00 00 00 00 00 00 00 00 00 00 00 00 f3 f3 f3
 ffff888021a5f880: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
EXT4-fs (loop5): Unrecognized mount option "di" or missing value
FAT-fs (loop7): Unrecognized mount option "P¥‰y["U" or missing value
9pnet: Insufficient options for proto=fd