REISERFS error (device loop5): vs-5150 search_by_key: invalid format found in block 535. Fsck?
REISERFS (device loop5): Remounting filesystem read-only
REISERFS error (device loop5): vs-13080 reiserfs_new_directory: i/o failure occurred creating new directory
============================================
WARNING: possible recursive locking detected
6.1.138-syzkaller #0 Not tainted
--------------------------------------------
syz.5.891/7854 is trying to acquire lock:
ffff8880557916c0 (&type->i_mutex_dir_key#12/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline]
ffff8880557916c0 (&type->i_mutex_dir_key#12/3){+.+.}-{3:3}, at: open_xa_root fs/reiserfs/xattr.c:127 [inline]
ffff8880557916c0 (&type->i_mutex_dir_key#12/3){+.+.}-{3:3}, at: open_xa_dir+0x11e/0x6f0 fs/reiserfs/xattr.c:152

but task is already holding lock:
ffff8880557016c0 (&type->i_mutex_dir_key#12/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline]
ffff8880557016c0 (&type->i_mutex_dir_key#12/3){+.+.}-{3:3}, at: open_xa_dir+0x41b/0x6f0 fs/reiserfs/xattr.c:160

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&type->i_mutex_dir_key#12/3);
  lock(&type->i_mutex_dir_key#12/3);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

4 locks held by syz.5.891/7854:
 #0: ffff888075d24460 (sb_writers#22){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:393
 #1: ffff888055791d60 (&sb->s_type->i_mutex_key#27){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
 #1: ffff888055791d60 (&sb->s_type->i_mutex_key#27){+.+.}-{3:3}, at: vfs_setxattr+0x141/0x2f0 fs/xattr.c:308
 #2: ffff8880557016c0 (&type->i_mutex_dir_key#12/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline]
 #2: ffff8880557016c0 (&type->i_mutex_dir_key#12/3){+.+.}-{3:3}, at: open_xa_dir+0x41b/0x6f0 fs/reiserfs/xattr.c:160
 #3: ffff88805583a090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock_nested+0x5c/0xd0 fs/reiserfs/lock.c:78

stack backtrace:
CPU: 0 PID: 7854 Comm: syz.5.891 Not tainted 6.1.138-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
 __lock_acquire+0x122f/0x7c50 kernel/locking/lockdep.c:-1
 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
 down_write_nested+0x39/0x60 kernel/locking/rwsem.c:1689
 inode_lock_nested include/linux/fs.h:793 [inline]
 open_xa_root fs/reiserfs/xattr.c:127 [inline]
 open_xa_dir+0x11e/0x6f0 fs/reiserfs/xattr.c:152
 reiserfs_for_each_xattr+0x174/0x7b0 fs/reiserfs/xattr.c:252
 reiserfs_delete_xattrs+0x1c/0x80 fs/reiserfs/xattr.c:364
 reiserfs_evict_inode+0x221/0x490 fs/reiserfs/inode.c:53
 evict+0x485/0x870 fs/inode.c:705
 reiserfs_new_inode+0x5c8/0x1860 fs/reiserfs/inode.c:2156
 reiserfs_mkdir+0x557/0x970 fs/reiserfs/namei.c:845
 xattr_mkdir fs/reiserfs/xattr.c:76 [inline]
 open_xa_dir+0x5c7/0x6f0 fs/reiserfs/xattr.c:167
 xattr_lookup+0x22/0x2a0 fs/reiserfs/xattr.c:395
 reiserfs_xattr_set_handle+0xf3/0xca0 fs/reiserfs/xattr.c:533
 reiserfs_xattr_set+0x435/0x550 fs/reiserfs/xattr.c:633
 __vfs_setxattr+0x3e0/0x420 fs/xattr.c:182
 __vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216
 vfs_setxattr+0x168/0x2f0 fs/xattr.c:309
 do_setxattr fs/xattr.c:594 [inline]
 setxattr+0x2b2/0x2d0 fs/xattr.c:617
 path_setxattr+0x142/0x280 fs/xattr.c:636
 __do_sys_lsetxattr fs/xattr.c:659 [inline]
 __se_sys_lsetxattr fs/xattr.c:655 [inline]
 __x64_sys_lsetxattr+0xb4/0xd0 fs/xattr.c:655
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1c25b8e969
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1c259ff038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 00007f1c25db5fa0 RCX: 00007f1c25b8e969
RDX: 0000200000000400 RSI: 00002000000000c0 RDI: 0000200000000080
RBP: 00007f1c25c10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000104 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1c25db5fa0 R15: 00007ffd159b89d8
 </TASK>