F2FS-fs (loop2): Magic Mismatch, valid(0xf2f52010) - read(0x0)
F2FS-fs (loop5): Can't find valid F2FS filesystem in 2th superblock
F2FS-fs (loop2): Can't find valid F2FS filesystem in 1th superblock
F2FS-fs (loop2): Magic Mismatch, valid(0xf2f52010) - read(0x0)
==================================================================
BUG: KASAN: slab-out-of-bounds in memset include/linux/string.h:330 [inline]
BUG: KASAN: slab-out-of-bounds in __ext4_expand_extra_isize+0x16f/0x240 fs/ext4/inode.c:5896
Write of size 16128 at addr ffff88019da38d80 by task syz-executor3/5794

CPU: 0 PID: 5794 Comm: syz-executor3 Not tainted 4.19.0+ #83
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+0x244/0x39d lib/dump_stack.c:113
 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
 memset+0x23/0x40 mm/kasan/kasan.c:285
 memset include/linux/string.h:330 [inline]
 __ext4_expand_extra_isize+0x16f/0x240 fs/ext4/inode.c:5896
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5948 [inline]
 ext4_mark_inode_dirty+0x8f9/0xb20 fs/ext4/inode.c:6024
 ext4_unlink+0x820/0x1220 fs/ext4/namei.c:3042
 vfs_unlink+0x2db/0x510 fs/namei.c:4000
 do_unlinkat+0x6cc/0xa30 fs/namei.c:4063
 __do_sys_unlink fs/namei.c:4110 [inline]
 __se_sys_unlink fs/namei.c:4108 [inline]
 __x64_sys_unlink+0x42/0x50 fs/namei.c:4108
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4572b7
Code: 00 66 90 b8 58 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 9d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 7d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffe80a9ebe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004572b7
RDX: 00007ffe80a9ec00 RSI: 00007ffe80a9ec00 RDI: 00007ffe80a9ec90
RBP: 000000000000179e R08: 0000000000000000 R09: 000000000000000d
R10: 0000000000000006 R11: 0000000000000246 R12: 00007ffe80a9fd20
R13: 000000000136d940 R14: 0000000000000000 R15: 0000000000000003

The buggy address belongs to the page:
page:ffffea0006768e00 count:2 mapcount:0 mapping:ffff8801cc45fc58 index:0x42e
flags: 0x2fffc0000001074(referenced|dirty|lru|active|private)
raw: 02fffc0000001074 ffffea0006b37588 ffffea0006bcd688 ffff8801cc45fc58
raw: 000000000000042e ffff8801bba95930 00000002ffffffff ffff8801b3f12680
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8801b3f12680

Memory state around the buggy address:
 ffff88019da39f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88019da39f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88019da3a000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88019da3a080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88019da3a100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
F2FS-fs (loop2): Can't find valid F2FS filesystem in 2th superblock