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BUG: KASAN: stack-out-of-bounds in iov_iter_revert lib/iov_iter.c:1047 [inline]
BUG: KASAN: stack-out-of-bounds in iov_iter_revert+0x90c/0x9a0 lib/iov_iter.c:996
Read of size 8 at addr ffff88805cacfd10 by task syz-executor.1/27898

CPU: 1 PID: 27898 Comm: syz-executor.1 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 iov_iter_revert lib/iov_iter.c:1047 [inline]
 iov_iter_revert+0x90c/0x9a0 lib/iov_iter.c:996
 generic_file_read_iter+0x16fb/0x2b60 mm/filemap.c:2369
 fuse_file_read_iter+0x198/0x240 fs/fuse/file.c:944
 call_read_iter include/linux/fs.h:1815 [inline]
 new_sync_read fs/read_write.c:406 [inline]
 __vfs_read+0x518/0x750 fs/read_write.c:418
 vfs_read+0x194/0x3c0 fs/read_write.c:452
 ksys_read+0x12b/0x2a0 fs/read_write.c:579
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7efe79388ae9
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:00007efe768fe188 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007efe7949bf60 RCX: 00007efe79388ae9
RDX: 000000002000a3a0 RSI: 0000000020008380 RDI: 0000000000000005
RBP: 00007efe793e2f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffde3b5dccf R14: 00007efe768fe300 R15: 0000000000022000

The buggy address belongs to the page:
page:ffffea000172b3c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0xfff00000000000()
raw: 00fff00000000000 0000000000000000 ffffffff01720101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88805cacfc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88805cacfc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1
>ffff88805cacfd00: f1 f1 f1 00 00 f2 f2 00 00 00 00 00 f2 f2 f2 f2
                         ^
 ffff88805cacfd80: f2 00 00 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00
 ffff88805cacfe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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