====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.4.1259/9975 is trying to acquire lock: ffff888077296650 (&type->i_mutex_dir_key#26/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:839 [inline] ffff888077296650 (&type->i_mutex_dir_key#26/3){+.+.}-{3:3}, at: open_xa_root fs/reiserfs/xattr.c:128 [inline] ffff888077296650 (&type->i_mutex_dir_key#26/3){+.+.}-{3:3}, at: open_xa_dir+0x146/0x6f0 fs/reiserfs/xattr.c:153 but task is already holding lock: ffff888025f40090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock_nested+0x60/0xd0 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}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x135/0xce0 kernel/locking/mutex.c:747 reiserfs_write_lock+0x79/0xd0 fs/reiserfs/lock.c:27 reiserfs_mkdir+0x30a/0x920 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+0x327/0x6f0 fs/reiserfs/xattr.c:153 xattr_lookup+0x22/0x2a0 fs/reiserfs/xattr.c:396 reiserfs_xattr_set_handle+0x11a/0xd10 fs/reiserfs/xattr.c:535 reiserfs_xattr_set+0x47b/0x5b0 fs/reiserfs/xattr.c:635 __vfs_setxattr+0x437/0x470 fs/xattr.c:201 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:235 vfs_setxattr+0x16b/0x2f0 fs/xattr.c:322 do_setxattr fs/xattr.c:630 [inline] path_setxattr+0x33a/0x590 fs/xattr.c:659 __do_sys_setxattr fs/xattr.c:677 [inline] __se_sys_setxattr fs/xattr.c:673 [inline] __x64_sys_setxattr+0xbb/0xd0 fs/xattr.c:673 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&type->i_mutex_dir_key#26/3){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3162 [inline] check_prevs_add kernel/locking/lockdep.c:3281 [inline] validate_chain kernel/locking/lockdep.c:3897 [inline] __lock_acquire+0x3a07/0x7eb0 kernel/locking/lockdep.c:5171 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5790 down_write_nested+0x9e/0x200 kernel/locking/rwsem.c:1689 inode_lock_nested include/linux/fs.h:839 [inline] open_xa_root fs/reiserfs/xattr.c:128 [inline] open_xa_dir+0x146/0x6f0 fs/reiserfs/xattr.c:153 reiserfs_for_each_xattr+0x1bd/0xa30 fs/reiserfs/xattr.c:253 reiserfs_delete_xattrs+0x20/0x90 fs/reiserfs/xattr.c:365 reiserfs_evict_inode+0x24a/0x4c0 fs/reiserfs/inode.c:53 evict+0x4b3/0x9d0 fs/inode.c:702 reiserfs_mknod+0x569/0x6d0 fs/reiserfs/namei.c:772 vfs_mknod+0x325/0x360 fs/namei.c:4058 unix_bind_bsd net/unix/af_unix.c:1279 [inline] unix_bind+0x602/0xf30 net/unix/af_unix.c:1372 __sys_bind+0x2f0/0x3f0 net/socket.c:1856 __do_sys_bind net/socket.c:1867 [inline] __se_sys_bind net/socket.c:1865 [inline] __x64_sys_bind+0x7a/0x90 net/socket.c:1865 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->lock); lock(&type->i_mutex_dir_key#26/3); lock(&sbi->lock); lock(&type->i_mutex_dir_key#26/3); *** DEADLOCK *** 3 locks held by syz.4.1259/9975: #0: ffff888030960418 (sb_writers#34){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:412 #1: ffff888077296cf0 (&type->i_mutex_dir_key#26/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:839 [inline] #1: ffff888077296cf0 (&type->i_mutex_dir_key#26/1){+.+.}-{3:3}, at: filename_create+0x20f/0x450 fs/namei.c:3949 #2: ffff888025f40090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock_nested+0x60/0xd0 fs/reiserfs/lock.c:78 stack backtrace: CPU: 0 PID: 9975 Comm: syz.4.1259 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 check_noncircular+0x2fc/0x400 kernel/locking/lockdep.c:2215 check_prev_add kernel/locking/lockdep.c:3162 [inline] check_prevs_add kernel/locking/lockdep.c:3281 [inline] validate_chain kernel/locking/lockdep.c:3897 [inline] __lock_acquire+0x3a07/0x7eb0 kernel/locking/lockdep.c:5171 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5790 down_write_nested+0x9e/0x200 kernel/locking/rwsem.c:1689 inode_lock_nested include/linux/fs.h:839 [inline] open_xa_root fs/reiserfs/xattr.c:128 [inline] open_xa_dir+0x146/0x6f0 fs/reiserfs/xattr.c:153 reiserfs_for_each_xattr+0x1bd/0xa30 fs/reiserfs/xattr.c:253 reiserfs_delete_xattrs+0x20/0x90 fs/reiserfs/xattr.c:365 reiserfs_evict_inode+0x24a/0x4c0 fs/reiserfs/inode.c:53 evict+0x4b3/0x9d0 fs/inode.c:702 reiserfs_mknod+0x569/0x6d0 fs/reiserfs/namei.c:772 vfs_mknod+0x325/0x360 fs/namei.c:4058 unix_bind_bsd net/unix/af_unix.c:1279 [inline] unix_bind+0x602/0xf30 net/unix/af_unix.c:1372 __sys_bind+0x2f0/0x3f0 net/socket.c:1856 __do_sys_bind net/socket.c:1867 [inline] __se_sys_bind net/socket.c:1865 [inline] __x64_sys_bind+0x7a/0x90 net/socket.c:1865 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f6c4e39f559 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6c4c5f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007f6c4e626090 RCX: 00007f6c4e39f559 RDX: 000000000000006e RSI: 0000200000000280 RDI: 0000000000000005 RBP: 00007f6c4e436b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6c4e626128 R14: 00007f6c4e626090 R15: 00007ffdb9538be8