==================================================================
BUG: KASAN: stack-out-of-bounds in iov_iter_revert+0x179/0xa30 lib/iov_iter.c:1093
Read of size 8 at addr ffffc900098bef58 by task syz-executor.0/29085

CPU: 0 PID: 29085 Comm: syz-executor.0 Not tainted 5.14.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1ae/0x29f lib/dump_stack.c:105
 print_address_description+0x66/0x3b0 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report+0x163/0x210 mm/kasan/report.c:436
 iov_iter_revert+0x179/0xa30 lib/iov_iter.c:1093
 io_write+0x8ba/0xb90 fs/io_uring.c:3463
 io_issue_sqe+0xc34/0x9530 fs/io_uring.c:6185
 __io_queue_sqe+0x1f9/0xf00 fs/io_uring.c:6468
 io_submit_sqe fs/io_uring.c:6666 [inline]
 io_submit_sqes+0x1e49/0x7d40 fs/io_uring.c:6782
 __do_sys_io_uring_enter fs/io_uring.c:9389 [inline]
 __se_sys_io_uring_enter+0x22b/0x1d30 fs/io_uring.c:9332
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
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:00007fcb4886d188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000000000 RSI: 00000000000062b2 RDI: 0000000000000005
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffddd62752f R14: 00007fcb4886d300 R15: 0000000000022000


addr ffffc900098bef58 is located in stack of task syz-executor.0/29085 at offset 24 in frame:
 io_write+0x0/0xb90 arch/x86/include/asm/atomic.h:29

this frame has 3 objects:
 [32, 160) 'inline_vecs'
 [192, 200) 'iovec'
 [224, 264) '__iter'

Memory state around the buggy address:
 ffffc900098bee00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc900098bee80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc900098bef00: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00
                                                    ^
 ffffc900098bef80: 00 00 00 00 00 00 00 00 00 00 00 00 f2 f2 f2 f2
 ffffc900098bf000: 00 f2 f2 f2 00 00 00 00 00 f3 f3 f3 f3 f3 f3 f3
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	ff c3                	inc    %ebx
   2:	66 2e 0f 1f 84 00 00 	nopw   %cs:0x0(%rax,%rax,1)
   9:	00 00 00 
   c:	0f 1f 40 00          	nopl   0x0(%rax)
  10:	48 89 f8             	mov    %rdi,%rax
  13:	48 89 f7             	mov    %rsi,%rdi
  16:	48 89 d6             	mov    %rdx,%rsi
  19:	48 89 ca             	mov    %rcx,%rdx
  1c:	4d 89 c2             	mov    %r8,%r10
  1f:	4d 89 c8             	mov    %r9,%r8
  22:	4c 8b 4c 24 08       	mov    0x8(%rsp),%r9
  27:	0f 05                	syscall 
  29:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax <-- trapping instruction
  2f:	73 01                	jae    0x32
  31:	c3                   	retq   
  32:	48 c7 c1 bc ff ff ff 	mov    $0xffffffffffffffbc,%rcx
  39:	f7 d8                	neg    %eax
  3b:	64 89 01             	mov    %eax,%fs:(%rcx)
  3e:	48                   	rex.W