REISERFS (device loop0): Using rupasov hash to sort names
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
======================================================
WARNING: possible circular locking dependency detected
6.7.0-rc8-syzkaller-g0802e17d9aca #0 Not tainted
------------------------------------------------------
syz-executor331/6095 is trying to acquire lock:
ffff0000deca0980 (&type->i_mutex_dir_key#6/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:837 [inline]
ffff0000deca0980 (&type->i_mutex_dir_key#6/3){+.+.}-{3:3}, at: open_xa_root fs/reiserfs/xattr.c:128 [inline]
ffff0000deca0980 (&type->i_mutex_dir_key#6/3){+.+.}-{3:3}, at: open_xa_dir+0x11c/0x578 fs/reiserfs/xattr.c:153

but task is already holding lock:
ffff0000ceb5c090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock_nested+0x68/0xd8 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}:
       __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
       __mutex_lock kernel/locking/mutex.c:747 [inline]
       mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799
       reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27
       reiserfs_mkdir+0x280/0x77c 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+0x288/0x578 fs/reiserfs/xattr.c:153
       xattr_lookup+0x3c/0x268 fs/reiserfs/xattr.c:396
       reiserfs_xattr_set_handle+0xe0/0xe94 fs/reiserfs/xattr.c:535
       reiserfs_security_write+0x13c/0x1d0 fs/reiserfs/xattr_security.c:107
       reiserfs_new_inode+0x1084/0x1698 fs/reiserfs/inode.c:2105
       reiserfs_create+0x33c/0x5a4 fs/reiserfs/namei.c:666
       lookup_open fs/namei.c:3477 [inline]
       open_last_lookups fs/namei.c:3546 [inline]
       path_openat+0xfb4/0x2888 fs/namei.c:3776
       do_filp_open+0x1bc/0x3cc fs/namei.c:3809
       do_sys_openat2+0x124/0x1b8 fs/open.c:1437
       do_sys_open fs/open.c:1452 [inline]
       __do_sys_openat fs/open.c:1468 [inline]
       __se_sys_openat fs/open.c:1463 [inline]
       __arm64_sys_openat+0x1f0/0x240 fs/open.c:1463
       __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
       el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
       do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
       el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678
       el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
       el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595

-> #0 (&type->i_mutex_dir_key#6/3){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x3384/0x763c kernel/locking/lockdep.c:5137
       lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5754
       down_write_nested+0x58/0xcc kernel/locking/rwsem.c:1695
       inode_lock_nested include/linux/fs.h:837 [inline]
       open_xa_root fs/reiserfs/xattr.c:128 [inline]
       open_xa_dir+0x11c/0x578 fs/reiserfs/xattr.c:153
       xattr_lookup+0x3c/0x268 fs/reiserfs/xattr.c:396
       reiserfs_xattr_get+0xf0/0x96c fs/reiserfs/xattr.c:679
       security_get+0x94/0xd0 fs/reiserfs/xattr_security.c:19
       __vfs_getxattr+0x394/0x3c0 fs/xattr.c:424
       smk_fetch+0xc8/0x150 security/smack/smack_lsm.c:304
       smack_d_instantiate+0x594/0x880 security/smack/smack_lsm.c:3573
       security_d_instantiate+0x98/0xf0 security/security.c:3799
       d_instantiate_new+0x64/0x120 fs/dcache.c:2052
       reiserfs_create+0x520/0x5a4 fs/reiserfs/namei.c:692
       lookup_open fs/namei.c:3477 [inline]
       open_last_lookups fs/namei.c:3546 [inline]
       path_openat+0xfb4/0x2888 fs/namei.c:3776
       do_filp_open+0x1bc/0x3cc fs/namei.c:3809
       do_sys_openat2+0x124/0x1b8 fs/open.c:1437
       do_sys_open fs/open.c:1452 [inline]
       __do_sys_openat fs/open.c:1468 [inline]
       __se_sys_openat fs/open.c:1463 [inline]
       __arm64_sys_openat+0x1f0/0x240 fs/open.c:1463
       __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
       el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
       do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
       el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678
       el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
       el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595

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-executor331/6095:
 #0: ffff0000d3c60418 (sb_writers#8){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:404
 #1: ffff0000deca02e0 (&type->i_mutex_dir_key#6){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
 #1: ffff0000deca02e0 (&type->i_mutex_dir_key#6){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3543 [inline]
 #1: ffff0000deca02e0 (&type->i_mutex_dir_key#6){+.+.}-{3:3}, at: path_openat+0x5f0/0x2888 fs/namei.c:3776
 #2: ffff0000ceb5c090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock_nested+0x68/0xd8 fs/reiserfs/lock.c:78

stack backtrace:
CPU: 1 PID: 6095 Comm: syz-executor331 Not tainted 6.7.0-rc8-syzkaller-g0802e17d9aca #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
 dump_stack+0x1c/0x28 lib/dump_stack.c:113
 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2060
 check_noncircular+0x310/0x404 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x3384/0x763c kernel/locking/lockdep.c:5137
 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5754
 down_write_nested+0x58/0xcc kernel/locking/rwsem.c:1695
 inode_lock_nested include/linux/fs.h:837 [inline]
 open_xa_root fs/reiserfs/xattr.c:128 [inline]
 open_xa_dir+0x11c/0x578 fs/reiserfs/xattr.c:153
 xattr_lookup+0x3c/0x268 fs/reiserfs/xattr.c:396
 reiserfs_xattr_get+0xf0/0x96c fs/reiserfs/xattr.c:679
 security_get+0x94/0xd0 fs/reiserfs/xattr_security.c:19
 __vfs_getxattr+0x394/0x3c0 fs/xattr.c:424
 smk_fetch+0xc8/0x150 security/smack/smack_lsm.c:304
 smack_d_instantiate+0x594/0x880 security/smack/smack_lsm.c:3573
 security_d_instantiate+0x98/0xf0 security/security.c:3799
 d_instantiate_new+0x64/0x120 fs/dcache.c:2052
 reiserfs_create+0x520/0x5a4 fs/reiserfs/namei.c:692
 lookup_open fs/namei.c:3477 [inline]
 open_last_lookups fs/namei.c:3546 [inline]
 path_openat+0xfb4/0x2888 fs/namei.c:3776
 do_filp_open+0x1bc/0x3cc fs/namei.c:3809
 do_sys_openat2+0x124/0x1b8 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_openat fs/open.c:1468 [inline]
 __se_sys_openat fs/open.c:1463 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1463
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595