EXT4-fs (sda1): re-mounted. Opts: debug_want_extra_isize=0x0000000000002000,,errors=continue
EXT4-fs error (device sda1): ext4_xattr_set_entry:1605: inode #16785: comm syz-executor0: corrupted xattr entries
==================================================================
BUG: KASAN: use-after-free in memset include/linux/string.h:337 [inline]
BUG: KASAN: use-after-free in __ext4_expand_extra_isize+0x16f/0x240 fs/ext4/inode.c:5897
Write of size 8192 at addr ffff8881a8f5e180 by task syz-executor1/17898
EXT4-fs error (device sda1): ext4_xattr_set_entry:1605: inode #16993: comm syz-executor3: corrupted xattr entries

CPU: 1 PID: 17898 Comm: syz-executor1 Not tainted 4.20.0-rc2+ #114
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
EXT4-fs error (device sda1): ext4_xattr_ibody_get:592: inode #16519: comm syz-executor2: corrupted in-inode xattr
 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:337 [inline]
 __ext4_expand_extra_isize+0x16f/0x240 fs/ext4/inode.c:5897
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5949 [inline]
 ext4_mark_inode_dirty+0x8f9/0xb20 fs/ext4/inode.c:6025
EXT4-fs error (device sda1): ext4_xattr_ibody_get:592: inode #16522: comm syz-executor3: corrupted in-inode xattr
EXT4-fs error (device sda1): ext4_xattr_ibody_get:592: inode #16524: comm syz-executor0: corrupted in-inode xattr
 add_dirent_to_buf+0x44d/0x6c0 fs/ext4/namei.c:1891
EXT4-fs error (device sda1): ext4_xattr_ibody_get:592: inode #16524: comm syz-executor0: corrupted in-inode xattr
 ext4_add_entry+0x57c/0xc10 fs/ext4/namei.c:2084
EXT4-fs error (device sda1): ext4_xattr_ibody_get:592: inode #16522: comm syz-executor3: corrupted in-inode xattr
 ext4_add_nondir+0x27/0x90 fs/ext4/namei.c:2413
 ext4_symlink+0x752/0x1130 fs/ext4/namei.c:3165
EXT4-fs error (device sda1): ext4_xattr_ibody_get:592: inode #16519: comm syz-executor2: corrupted in-inode xattr
EXT4-fs error (device sda1): ext4_xattr_ibody_get:592: inode #16524: comm syz-executor0: corrupted in-inode xattr
 vfs_symlink+0x37a/0x5d0 fs/namei.c:4127
 do_symlinkat+0x242/0x2d0 fs/namei.c:4154
EXT4-fs error (device sda1): ext4_xattr_ibody_get:592: inode #16522: comm syz-executor3: corrupted in-inode xattr
 __do_sys_symlink fs/namei.c:4173 [inline]
 __se_sys_symlink fs/namei.c:4171 [inline]
 __x64_sys_symlink+0x59/0x80 fs/namei.c:4171
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457297
Code: 0f 1f 00 b8 5c 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 bd b6 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 9d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fffd9efc338 EFLAGS: 00000202 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000457297
RDX: 00007fffd9efc3b7 RSI: 00000000004bcf91 RDI: 00007fffd9efc3a0
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000017
R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000001 R14: 00000000000003ae R15: 0000000000000001

The buggy address belongs to the page:
page:ffffea0006a3d780 count:2 mapcount:0 mapping:ffff8881cc8d8658 index:0x42b
flags: 0x2fffc000000203a(referenced|dirty|lru|active|private)
raw: 02fffc000000203a ffffea0006aa22c8 ffffea0006aa0b48 ffff8881cc8d8658
raw: 000000000000042b ffff8881cc99ef18 00000002ffffffff ffff8881812b8800
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8881812b8800

Memory state around the buggy address:
 ffff8881a8f5ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881a8f5ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881a8f60000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff8881a8f60080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881a8f60100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================