syzbot

REISERFS (device loop0): Using r5 hash to sort names
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
======================================================
WARNING: possible circular locking dependency detected
6.4.0-rc4-syzkaller-00031-g8b817fded42d #0 Not tainted
------------------------------------------------------
syz-executor274/4991 is trying to acquire lock:
ffff888074598980 (&type->i_mutex_dir_key#6/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:810 [inline]
ffff888074598980 (&type->i_mutex_dir_key#6/3){+.+.}-{3:3}, at: open_xa_root fs/reiserfs/xattr.c:128 [inline]
ffff888074598980 (&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:
ffff888015a86090 (&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_create+0x3e7/0x6e0 fs/reiserfs/namei.c:666
       lookup_open fs/namei.c:3492 [inline]
       open_last_lookups fs/namei.c:3560 [inline]
       path_openat+0x13df/0x3170 fs/namei.c:3788
       do_filp_open+0x234/0x490 fs/namei.c:3818
       do_sys_openat2+0x13f/0x500 fs/open.c:1356
       do_sys_open fs/open.c:1372 [inline]
       __do_sys_openat fs/open.c:1388 [inline]
       __se_sys_openat fs/open.c:1383 [inline]
       __x64_sys_openat+0x247/0x290 fs/open.c:1383
       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_create+0x5cf/0x6e0 fs/reiserfs/namei.c:692
       lookup_open fs/namei.c:3492 [inline]
       open_last_lookups fs/namei.c:3560 [inline]
       path_openat+0x13df/0x3170 fs/namei.c:3788
       do_filp_open+0x234/0x490 fs/namei.c:3818
       do_sys_openat2+0x13f/0x500 fs/open.c:1356
       do_sys_open fs/open.c:1372 [inline]
       __do_sys_openat fs/open.c:1388 [inline]
       __se_sys_openat fs/open.c:1383 [inline]
       __x64_sys_openat+0x247/0x290 fs/open.c:1383
       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-executor274/4991:
 #0: ffff88807db9a460 (sb_writers#9){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:394
 #1: ffff8880745982e0 (&type->i_mutex_dir_key#6){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline]
 #1: ffff8880745982e0 (&type->i_mutex_dir_key#6){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3557 [inline]
 #1: ffff8880745982e0 (&type->i_mutex_dir_key#6){+.+.}-{3:3}, at: path_openat+0x7ba/0x3170 fs/namei.c:3788
 #2: ffff888015a86090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock_nested+0x5f/0xd0 fs/reiserfs/lock.c:78

stack backtrace:
CPU: 1 PID: 4991 Comm: syz-executor274 Not tainted 6.4.0-rc4-syzkaller-00031-g8b817fded42d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
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_create+0x5cf/0x6e0 fs/reiserfs/namei.c:692
 lookup_open fs/namei.c:3492 [inline]
 open_last_lookups fs/namei.c:3560 [inline]
 path_openat+0x13df/0x3170 fs/namei.c:3788
 do_filp_open+0x234/0x490 fs/namei.c:3818
 do_sys_openat2+0x13f/0x500 fs/open.c:1356
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_openat fs/open.c:1388 [inline]
 __se_sys_openat fs/open.c:1383 [inline]
 __x64_sys_openat+0x247/0x290 fs/open.c:1383
 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: 0033:0x7ff8db7c4799
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:00007ffd5b6d0538 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff8db7c4799
RDX: 000000000000275a RSI: 0000000020000000 RDI: 00000000ffffff9c
RBP: 00007ff8db784030 R08: 00000000000010fb R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff8db7840c0
R13: 0000000000000000 R14: 0000000