EXT4-fs error (device loop0): ext4_mb_generate_buddy:747: group 0, block bitmap and bg descriptor inconsistent: 50 vs 25 free clusters
EXT4-fs error (device loop1): ext4_mb_generate_buddy:747: group 0, block bitmap and bg descriptor inconsistent: 50 vs 25 free clusters
EXT4-fs error (device loop5): ext4_mb_generate_buddy:747: group 0, block bitmap and bg descriptor inconsistent: 50 vs 25 free clusters
==================================================================
BUG: KASAN: out-of-bounds in memmove include/linux/string.h:392 [inline]
BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x186c/0x3950 fs/ext4/xattr.c:1733
Read of size 18446744073709551600 at addr ffff888098cb80d4 by task syz-executor.0/11359

CPU: 1 PID: 11359 Comm: syz-executor.0 Not tainted 4.19.203-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+0x17c/0x226 lib/dump_stack.c:118
 print_address_description.cold.6+0x9/0x211 mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report mm/kasan/report.c:412 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:396
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x13c/0x1b0 mm/kasan/kasan.c:267
 memmove+0x23/0x50 mm/kasan/kasan.c:293
 memmove include/linux/string.h:392 [inline]
 ext4_xattr_set_entry+0x186c/0x3950 fs/ext4/xattr.c:1733
 ext4_xattr_ibody_inline_set+0x70/0x290 fs/ext4/xattr.c:2222
 ext4_destroy_inline_data_nolock+0x1d6/0x490 fs/ext4/inline.c:434
 ext4_convert_inline_data_nolock+0x136/0xc40 fs/ext4/inline.c:1207
 ext4_convert_inline_data+0x299/0x3c0 fs/ext4/inline.c:2027
 ext4_fallocate+0xdb/0x1920 fs/ext4/extents.c:4962
 vfs_fallocate+0x2b5/0x7c0 fs/open.c:308
 ksys_fallocate+0x3c/0x80 fs/open.c:331
 __do_sys_fallocate fs/open.c:339 [inline]
 __se_sys_fallocate fs/open.c:337 [inline]
 __x64_sys_fallocate+0x92/0xf0 fs/open.c:337
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x466459
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:00007fe8a011f188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000466459
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000
R10: 0000000010000101 R11: 0000000000000246 R12: 000000000056c008
R13: 00007ffcc9c8dc6f R14: 00007fe8a011f300 R15: 0000000000022000

The buggy address belongs to the page:
page:ffffea0002632e00 count:2 mapcount:0 mapping:ffff8880ae21bba0 index:0x8
flags: 0xfff0000001107c(referenced|uptodate|dirty|lru|active|private|mappedtodisk)
raw: 00fff0000001107c ffffea00026de508 ffffea00026f41c8 ffff8880ae21bba0
raw: 0000000000000008 ffff888080aee000 00000002ffffffff ffff88823b2d4900
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff88823b2d4900

Memory state around the buggy address:
 ffff888098cb7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888098cb8000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888098cb8080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                 ^
 ffff888098cb8100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888098cb8180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	ff c3                	inc    %ebx
   2:	66 2e 0f 1f 84 00 00 	nopw   %cs:0x0(%rax,%rax,1)
   9:	00 00 00 
   c:	0f 1f 40 00          	nopl   0x0(%rax)
  10:	48 89 f8             	mov    %rdi,%rax
  13:	48 89 f7             	mov    %rsi,%rdi
  16:	48 89 d6             	mov    %rdx,%rsi
  19:	48 89 ca             	mov    %rcx,%rdx
  1c:	4d 89 c2             	mov    %r8,%r10
  1f:	4d 89 c8             	mov    %r9,%r8
  22:	4c 8b 4c 24 08       	mov    0x8(%rsp),%r9
  27:	0f 05                	syscall 
  29:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax <-- trapping instruction
  2f:	73 01                	jae    0x32
  31:	c3                   	retq   
  32:	48 c7 c1 bc ff ff ff 	mov    $0xffffffffffffffbc,%rcx
  39:	f7 d8                	neg    %eax
  3b:	64 89 01             	mov    %eax,%fs:(%rcx)
  3e:	48                   	rex.W