EXT4-fs error (device sda1): ext4_xattr_set_entry:1605: inode #16977: comm syz-executor.2: corrupted xattr entries
EXT4-fs error (device sda1): ext4_xattr_set_entry:1605: inode #17009: comm syz-executor.3: corrupted xattr entries
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BUG: KASAN: use-after-free in memset include/linux/string.h:332 [inline]
BUG: KASAN: use-after-free in __ext4_expand_extra_isize.isra.0+0x10b/0x1c0 fs/ext4/inode.c:5832
Write of size 3586 at addr ffff8881a6c0f3a0 by task syz-executor.5/16923
EXT4-fs error (device sda1): ext4_xattr_set_entry:1605: inode #17026: comm syz-executor.1: corrupted xattr entries

CPU: 1 PID: 16923 Comm: syz-executor.5 Not tainted 4.14.151+ #0
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xca/0x134 lib/dump_stack.c:53
 print_address_description+0x60/0x226 mm/kasan/report.c:187
 __kasan_report.cold+0x1a/0x41 mm/kasan/report.c:316
 memset+0x20/0x40 mm/kasan/common.c:113
 memset include/linux/string.h:332 [inline]
 __ext4_expand_extra_isize.isra.0+0x10b/0x1c0 fs/ext4/inode.c:5832
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5884 [inline]
 ext4_mark_inode_dirty+0x471/0x7f0 fs/ext4/inode.c:5960
 __ext4_ext_dirty+0x11e/0x170 fs/ext4/extents.c:177
 ext4_ext_remove_space+0x1773/0x3820 fs/ext4/extents.c:3077
 ext4_ext_truncate+0x19b/0x1e0 fs/ext4/extents.c:4669
 ext4_truncate+0xa21/0x1220 fs/ext4/inode.c:4491
 ext4_setattr+0x134c/0x2340 fs/ext4/inode.c:5574
 notify_change2+0xab8/0xd80 fs/attr.c:315
 do_truncate2+0x11e/0x1e0 fs/open.c:63
 handle_truncate fs/namei.c:3123 [inline]
 do_last fs/namei.c:3548 [inline]
 path_openat+0x1227/0x2be0 fs/namei.c:3681
 do_filp_open+0x1a1/0x280 fs/namei.c:3715
 do_sys_open+0x2ca/0x590 fs/open.c:1096
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459f49
RSP: 002b:00007f932805cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459f49
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f932805d6d4
R13: 00000000004c0784 R14: 00000000004d2ef0 R15: 00000000ffffffff

The buggy address belongs to the page:
page:ffffea00069b03c0 count:2 mapcount:0 mapping:ffff8881d56b8950 index:0x43a
flags: 0x400000000000203a(referenced|dirty|lru|active|private)
raw: 400000000000203a ffff8881d56b8950 000000000000043a 00000002ffffffff
raw: ffffea0006391ba0 ffffea0006407ba0 ffff8881d0fbbd20 ffff8881d641aa80
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8881d641aa80

Memory state around the buggy address:
 ffff8881a6c0ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881a6c0ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881a6c10000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff8881a6c10080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881a6c10100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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