REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
======================================================
WARNING: possible circular locking dependency detected
6.4.0-rc7-syzkaller-00014-g692b7dc87ca6 #0 Not tainted
------------------------------------------------------
syz-executor287/4994 is trying to acquire lock:
ffff888074148980 (&type->i_mutex_dir_key#6/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:810 [inline]
ffff888074148980 (&type->i_mutex_dir_key#6/3){+.+.}-{3:3}, at: open_xa_root fs/reiserfs/xattr.c:128 [inline]
ffff888074148980 (&type->i_mutex_dir_key#6/3){+.+.}-{3:3}, at: open_xa_dir+0x136/0x610 fs/reiserfs/xattr.c:153

but task is already holding lock:
ffff88807d04a090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock_nested+0x5f/0xd0 fs/reiserfs/lock.c:78

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&sbi->lock){+.+.}-{3:3}:
       lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5705
       __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603
       __mutex_lock kernel/locking/mutex.c:747 [inline]
       mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799
       reiserfs_write_lock+0x7a/0xd0 fs/reiserfs/lock.c:27
       reiserfs_mkdir+0x321/0x8f0 fs/reiserfs/namei.c:829
       xattr_mkdir fs/reiserfs/xattr.c:77 [inline]
       open_xa_root fs/reiserfs/xattr.c:137 [inline]
       open_xa_dir+0x2cd/0x610 fs/reiserfs/xattr.c:153
       xattr_lookup+0x24/0x280 fs/reiserfs/xattr.c:396
       reiserfs_xattr_set_handle+0xfc/0xdc0 fs/reiserfs/xattr.c:534
       reiserfs_security_write+0x157/0x1d0 fs/reiserfs/xattr_security.c:106
       reiserfs_new_inode+0x1631/0x1d40 fs/reiserfs/inode.c:2111
       reiserfs_mkdir+0x5b0/0x8f0 fs/reiserfs/namei.c:843
       vfs_mkdir+0x29d/0x450 fs/namei.c:4115
       do_mkdirat+0x264/0x520 fs/namei.c:4138
       __do_sys_mkdir fs/namei.c:4158 [inline]
       __se_sys_mkdir fs/namei.c:4156 [inline]
       __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4156
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #0 (&type->i_mutex_dir_key#6/3){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3113 [inline]
       check_prevs_add kernel/locking/lockdep.c:3232 [inline]
       validate_chain+0x166b/0x58f0 kernel/locking/lockdep.c:3847
       __lock_acquire+0x1316/0x2070 kernel/locking/lockdep.c:5088
       lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5705
       down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1689
       inode_lock_nested include/linux/fs.h:810 [inline]
       open_xa_root fs/reiserfs/xattr.c:128 [inline]
       open_xa_dir+0x136/0x610 fs/reiserfs/xattr.c:153
       xattr_lookup+0x24/0x280 fs/reiserfs/xattr.c:396
       reiserfs_xattr_get+0xfd/0x570 fs/reiserfs/xattr.c:678
       __vfs_getxattr+0x436/0x470 fs/xattr.c:424
       smk_fetch+0xb1/0x140 security/smack/smack_lsm.c:295
       smack_d_instantiate+0x6d9/0xb40 security/smack/smack_lsm.c:3475
       security_d_instantiate+0x9b/0xf0 security/security.c:3760
       d_instantiate_new+0x65/0x120 fs/dcache.c:2053
       reiserfs_mkdir+0x769/0x8f0 fs/reiserfs/namei.c:877
       vfs_mkdir+0x29d/0x450 fs/namei.c:4115
       do_mkdirat+0x264/0x520 fs/namei.c:4138
       __do_sys_mkdir fs/namei.c:4158 [inline]
       __se_sys_mkdir fs/namei.c:4156 [inline]
       __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4156
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&sbi->lock);
                               lock(&type->i_mutex_dir_key#6/3);
                               lock(&sbi->lock);
  lock(&type->i_mutex_dir_key#6/3);

 *** DEADLOCK ***

3 locks held by syz-executor287/4994:
 #0: ffff8880166cc460 (sb_writers#9){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:394
 #1: ffff8880741482e0 (&type->i_mutex_dir_key#6/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:810 [inline]
 #1: ffff8880741482e0 (&type->i_mutex_dir_key#6/1){+.+.}-{3:3}, at: filename_create+0x260/0x530 fs/namei.c:3884
 #2: ffff88807d04a090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock_nested+0x5f/0xd0 fs/reiserfs/lock.c:78

stack backtrace:
CPU: 0 PID: 4994 Comm: syz-executor287 Not tainted 6.4.0-rc7-syzkaller-00014-g692b7dc87ca6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 check_noncircular+0x2fe/0x3b0 kernel/locking/lockdep.c:2188
 check_prev_add kernel/locking/lockdep.c:3113 [inline]
 check_prevs_add kernel/locking/lockdep.c:3232 [inline]
 validate_chain+0x166b/0x58f0 kernel/locking/lockdep.c:3847
 __lock_acquire+0x1316/0x2070 kernel/locking/lockdep.c:5088
 lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5705
 down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1689
 inode_lock_nested include/linux/fs.h:810 [inline]
 open_xa_root fs/reiserfs/xattr.c:128 [inline]
 open_xa_dir+0x136/0x610 fs/reiserfs/xattr.c:153
 xattr_lookup+0x24/0x280 fs/reiserfs/xattr.c:396
 reiserfs_xattr_get+0xfd/0x570 fs/reiserfs/xattr.c:678
 __vfs_getxattr+0x436/0x470 fs/xattr.c:424
 smk_fetch+0xb1/0x140 security/smack/smack_lsm.c:295
 smack_d_instantiate+0x6d9/0xb40 security/smack/smack_lsm.c:3475
 security_d_instantiate+0x9b/0xf0 security/security.c:3760
 d_instantiate_new+0x65/0x120 fs/dcache.c:2053
 reiserfs_mkdir+0x769/0x8f0 fs/reiserfs/namei.c:877
 vfs_mkdir+0x29d/0x450 fs/namei.c:4115
 do_mkdirat+0x264/0x520 fs/namei.c:4138
 __do_sys_mkdir fs/namei.c:4158 [inline]
 __se_sys_mkdir fs/namei.c:4156 [inline]
 __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4156
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f89f7f01819
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 00 00 90 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd33122d08 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f89f7f01819
RDX: 00007f89f7ebfe93 RSI: 0000000000000000 RDI: 0000000020000040
RBP: 00007f89f7ec10b0 R08: 00000000000010e8 R09: 0000000000000000
R10: 00007ffd33122bd0 R11: 0000000000000246 R12: 00007f89f7ec1140