====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz-executor/6214 is trying to acquire lock: ffff888071635900 (&type->i_mutex_dir_key#11/2){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] ffff888071635900 (&type->i_mutex_dir_key#11/2){+.+.}-{3:3}, at: xattr_rmdir fs/reiserfs/xattr.c:106 [inline] ffff888071635900 (&type->i_mutex_dir_key#11/2){+.+.}-{3:3}, at: delete_one_xattr+0xf6/0x300 fs/reiserfs/xattr.c:338 but task is already holding lock: ffff888071634520 (&type->i_mutex_dir_key#11/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] ffff888071634520 (&type->i_mutex_dir_key#11/3){+.+.}-{3:3}, at: reiserfs_for_each_xattr+0x629/0x7b0 fs/reiserfs/xattr.c:309 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&type->i_mutex_dir_key#11/3){+.+.}-{3:3}: 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 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 -> #1 (&type->i_mutex_dir_key#11){++++}-{3:3}: down_write+0x36/0x60 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:758 [inline] vfs_rename+0x81f/0x10d0 fs/namei.c:4847 do_renameat2+0x89d/0xc70 fs/namei.c:5035 __do_sys_renameat2 fs/namei.c:5068 [inline] __se_sys_renameat2 fs/namei.c:5065 [inline] __x64_sys_renameat2+0xce/0xe0 fs/namei.c:5065 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 -> #0 (&type->i_mutex_dir_key#11/2){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 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] xattr_rmdir fs/reiserfs/xattr.c:106 [inline] delete_one_xattr+0xf6/0x300 fs/reiserfs/xattr.c:338 reiserfs_for_each_xattr+0x635/0x7b0 fs/reiserfs/xattr.c:311 reiserfs_delete_xattrs+0x1c/0x80 fs/reiserfs/xattr.c:364 reiserfs_evict_inode+0x22e/0x490 fs/reiserfs/inode.c:53 evict+0x485/0x870 fs/inode.c:705 d_delete_notify include/linux/fsnotify.h:267 [inline] vfs_rmdir+0x397/0x4d0 fs/namei.c:4212 do_rmdir+0x288/0x5e0 fs/namei.c:4260 __do_sys_unlinkat fs/namei.c:4440 [inline] __se_sys_unlinkat fs/namei.c:4434 [inline] __x64_sys_unlinkat+0xc0/0xe0 fs/namei.c:4434 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 other info that might help us debug this: Chain exists of: &type->i_mutex_dir_key#11/2 --> &type->i_mutex_dir_key#11 --> &type->i_mutex_dir_key#11/3 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&type->i_mutex_dir_key#11/3); lock(&type->i_mutex_dir_key#11); lock(&type->i_mutex_dir_key#11/3); lock(&type->i_mutex_dir_key#11/2); *** DEADLOCK *** 3 locks held by syz-executor/6214: #0: ffff88805830c460 (sb_writers#20){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402 #1: ffff888048071d60 (&type->i_mutex_dir_key#11/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #1: ffff888048071d60 (&type->i_mutex_dir_key#11/1){+.+.}-{3:3}, at: do_rmdir+0x19d/0x5e0 fs/namei.c:4247 #2: ffff888071634520 (&type->i_mutex_dir_key#11/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #2: ffff888071634520 (&type->i_mutex_dir_key#11/3){+.+.}-{3:3}, at: reiserfs_for_each_xattr+0x629/0x7b0 fs/reiserfs/xattr.c:309 stack backtrace: CPU: 1 PID: 6214 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 check_noncircular+0x274/0x310 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 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] xattr_rmdir fs/reiserfs/xattr.c:106 [inline] delete_one_xattr+0xf6/0x300 fs/reiserfs/xattr.c:338 reiserfs_for_each_xattr+0x635/0x7b0 fs/reiserfs/xattr.c:311 reiserfs_delete_xattrs+0x1c/0x80 fs/reiserfs/xattr.c:364 reiserfs_evict_inode+0x22e/0x490 fs/reiserfs/inode.c:53 evict+0x485/0x870 fs/inode.c:705 d_delete_notify include/linux/fsnotify.h:267 [inline] vfs_rmdir+0x397/0x4d0 fs/namei.c:4212 do_rmdir+0x288/0x5e0 fs/namei.c:4260 __do_sys_unlinkat fs/namei.c:4440 [inline] __se_sys_unlinkat fs/namei.c:4434 [inline] __x64_sys_unlinkat+0xc0/0xe0 fs/namei.c:4434 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: 0033:0x7f65d3b8ed27 Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 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:00007ffcddc8d468 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f65d3b8ed27 RDX: 0000000000000200 RSI: 00007ffcddc8e610 RDI: 00000000ffffff9c RBP: 00007f65d3c13d7d R08: 0000555574b5166b R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000207 R12: 00007ffcddc8e610 R13: 00007f65d3c13d7d R14: 000000000006ebdd R15: 00007ffcddc907d0 REISERFS warning (device loop7): vs-13060 reiserfs_update_sd_size: stat data of object [1 2 0x0 SD] (nlink == 4) not found (pos 2) REISERFS warning (device loop7): vs-13060 reiserfs_update_sd_size: stat data of object [1 2 0x0 SD] (nlink == 4) not found (pos 2) EXT4-fs (loop7): unmounting filesystem.