XFS (loop5): Invalid superblock magic number
==================================================================
BUG: KASAN: use-after-free in memset include/linux/string.h:337 [inline]
BUG: KASAN: use-after-free in __ext4_expand_extra_isize+0x16c/0x240 fs/ext4/inode.c:5923
Write of size 576 at addr ffff88807313d040 by task syz-executor.0/23613

CPU: 0 PID: 23613 Comm: syz-executor.0 Not tainted 5.0.0-rc6+ #74
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+0x172/0x1f0 lib/dump_stack.c:113
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x123/0x190 mm/kasan/generic.c:191
 memset+0x24/0x40 mm/kasan/common.c:113
 memset include/linux/string.h:337 [inline]
 __ext4_expand_extra_isize+0x16c/0x240 fs/ext4/inode.c:5923
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5975 [inline]
 ext4_mark_inode_dirty+0x6e9/0x940 fs/ext4/inode.c:6051
 add_dirent_to_buf+0x402/0x680 fs/ext4/namei.c:1891
 ext4_add_entry+0x5cc/0xb70 fs/ext4/namei.c:2084
 ext4_add_nondir+0x28/0x90 fs/ext4/namei.c:2413
 ext4_symlink+0x5e8/0xbe0 fs/ext4/namei.c:3165
 vfs_symlink fs/namei.c:4126 [inline]
 vfs_symlink+0x378/0x5d0 fs/namei.c:4112
 do_symlinkat+0x22b/0x290 fs/namei.c:4153
 __do_sys_symlink fs/namei.c:4172 [inline]
 __se_sys_symlink fs/namei.c:4170 [inline]
 __x64_sys_symlink+0x59/0x80 fs/namei.c:4170
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457b57
Code: 0f 1f 00 b8 5c 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 6d bb fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 58 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 4d bb fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffe95223548 EFLAGS: 00000206 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000457b57
RDX: 00007ffe952235c7 RSI: 00000000004bd616 RDI: 00007ffe952235b0
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000017
R10: 0000000000000075 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000001 R14: 000000000000029f R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0001cc4f40 count:0 mapcount:0 mapping:0000000000000000 index:0x1
flags: 0x1fffc0000000000()
raw: 01fffc0000000000 ffffea0002022288 ffffea0001db4d48 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88807313cf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88807313cf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88807313d000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                           ^
 ffff88807313d080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88807313d100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================