syzbot

loop0: detected capacity change from 0 to 512
------------[ cut here ]------------
EA inode 11 i_nlink=65535
WARNING: fs/ext4/xattr.c:1059 at ext4_xattr_inode_update_ref+0x4c9/0x5a0 fs/ext4/xattr.c:1057, CPU#0: syz.0.17/5957
Modules linked in:
CPU: 0 UID: 0 PID: 5957 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:ext4_xattr_inode_update_ref+0x511/0x5a0 fs/ext4/xattr.c:1057
Code: 74 08 4c 89 ef e8 df 2b 9b ff 4d 8b 6d 00 48 b8 00 00 00 00 00 fc ff df 41 0f b6 04 06 84 c0 75 77 41 8b 17 4c 89 e7 4c 89 ee <67> 48 0f b9 3a 4c 8b 6c 24 28 e9 59 fe ff ff e8 1b 16 8b 08 44 89
RSP: 0018:ffffc9000415f100 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00000000ffffffff RCX: dffffc0000000000
RDX: 000000000000ffff RSI: 000000000000000b RDI: ffffffff8f8eb990
RBP: ffffc9000415f200 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100bdd209a R12: ffffffff8f8eb990
R13: 000000000000000b R14: 1ffff1100bdd205e R15: ffff88805ee902f0
FS:  000055555b7cb500(0000) GS:ffff888126183000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555cc02b1138 CR3: 000000002ed92000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ext4_xattr_inode_dec_ref fs/ext4/xattr.c:1082 [inline]
 ext4_xattr_set_entry+0xabb/0x1e20 fs/ext4/xattr.c:1726
 ext4_xattr_ibody_set+0x254/0x6a0 fs/ext4/xattr.c:2275
 ext4_xattr_move_to_block fs/ext4/xattr.c:2678 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2746 [inline]
 ext4_expand_extra_isize_ea+0x13a2/0x1ea0 fs/ext4/xattr.c:2834
 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6434
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6477 [inline]
 __ext4_mark_inode_dirty+0x45c/0x710 fs/ext4/inode.c:6555
 ext4_evict_inode+0x986/0x10e0 fs/ext4/inode.c:267
 evict+0x61e/0xb10 fs/inode.c:841
 ext4_orphan_cleanup+0xc38/0x1470 fs/ext4/orphan.c:472
 __ext4_fill_super fs/ext4/super.c:5701 [inline]
 ext4_fill_super+0x59bb/0x62d0 fs/ext4/super.c:5824
 get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1694
 vfs_get_tree+0x92/0x2a0 fs/super.c:1754
 fc_mount fs/namespace.c:1193 [inline]
 do_new_mount_fc fs/namespace.c:3758 [inline]
 do_new_mount+0x341/0xd30 fs/namespace.c:3834
 do_mount fs/namespace.c:4167 [inline]
 __do_sys_mount fs/namespace.c:4383 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4360
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3cdcdce0ca
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff32e2d4b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fff32e2d540 RCX: 00007f3cdcdce0ca
RDX: 0000200000000180 RSI: 0000200000000040 RDI: 00007fff32e2d500
RBP: 0000200000000180 R08: 00007fff32e2d540 R09: 0000000000000010
R10: 0000000000000010 R11: 0000000000000246 R12: 0000200000000040
R13: 00007fff32e2d500 R14: 0000000000000485 R15: 000000000000002c
 </TASK>
----------------
Code disassembly (best guess):
   0:	74 08                	je     0xa
   2:	4c 89 ef             	mov    %r13,%rdi
   5:	e8 df 2b 9b ff       	call   0xff9b2be9
   a:	4d 8b 6d 00          	mov    0x0(%r13),%r13
   e:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  15:	fc ff df
  18:	41 0f b6 04 06       	movzbl (%r14,%rax,1),%eax
  1d:	84 c0                	test   %al,%al
  1f:	75 77                	jne    0x98
  21:	41 8b 17             	mov    (%r15),%edx
  24:	4c 89 e7             	mov    %r12,%rdi
  27:	4c 89 ee             	mov    %r13,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	4c 8b 6c 24 28       	mov    0x28(%rsp),%r13
  34:	e9 59 fe ff ff       	jmp    0xfffffe92
  39:	e8 1b 16 8b 08       	call   0x88b1659
  3e:	44                   	rex.R
  3f:	89                   	.byte 0x89