====================================================== WARNING: possible circular locking dependency detected 6.7.0-rc8-syzkaller-g0802e17d9aca #0 Not tainted ------------------------------------------------------ syz-executor.4/16956 is trying to acquire lock: ffff000123d10980 ( &type->i_mutex_dir_key #15 /3 ){+.+.}-{3:3} , at: inode_lock_nested include/linux/fs.h:837 [inline] , at: open_xa_root fs/reiserfs/xattr.c:128 [inline] , at: open_xa_dir+0x11c/0x578 fs/reiserfs/xattr.c:153 but task is already holding lock: ffff000121e7c090 ( &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 #15 /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 reiserfs_for_each_xattr+0x16c/0x8d8 fs/reiserfs/xattr.c:253 reiserfs_delete_xattrs+0x2c/0xa4 fs/reiserfs/xattr.c:365 reiserfs_evict_inode+0x1dc/0x3f0 fs/reiserfs/inode.c:53 evict+0x260/0x68c fs/inode.c:666 iput_final fs/inode.c:1777 [inline] iput+0x734/0x818 fs/inode.c:1803 reiserfs_new_inode+0x5a0/0x1698 fs/reiserfs/inode.c:2148 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 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->lock); lock(&type->i_mutex_dir_key#15/3); lock(&sbi->lock); lock(&type->i_mutex_dir_key#15/3); *** DEADLOCK *** 3 locks held by syz-executor.4/16956: #0: ffff0000c6ad8418 (sb_writers#27){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:404 #1: ffff000123d102e0 (&type->i_mutex_dir_key#15){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline] #1: ffff000123d102e0 (&type->i_mutex_dir_key#15){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3543 [inline] #1: ffff000123d102e0 (&type->i_mutex_dir_key#15){+.+.}-{3:3}, at: path_openat+0x5f0/0x2888 fs/namei.c:3776 #2: ffff000121e7c090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock_nested+0x68/0xd8 fs/reiserfs/lock.c:78 stack backtrace: CPU: 0 PID: 16956 Comm: syz-executor.4 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 reiserfs_for_each_xattr+0x16c/0x8d8 fs/reiserfs/xattr.c:253 reiserfs_delete_xattrs+0x2c/0xa4 fs/reiserfs/xattr.c:365 reiserfs_evict_inode+0x1dc/0x3f0 fs/reiserfs/inode.c:53 evict+0x260/0x68c fs/inode.c:666 iput_final fs/inode.c:1777 [inline] iput+0x734/0x818 fs/inode.c:1803 reiserfs_new_inode+0x5a0/0x1698 fs/reiserfs/inode.c:2148 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