====================================================== WARNING: possible circular locking dependency detected 6.9.0-rc6-syzkaller-00046-g18daea77cca6 #0 Not tainted ------------------------------------------------------ syz-executor.4/6149 is trying to acquire lock: ffff0000e599fa20 (&type->i_mutex_dir_key#8/2){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:830 [inline] ffff0000e599fa20 (&type->i_mutex_dir_key#8/2){+.+.}-{3:3}, at: xattr_rmdir fs/reiserfs/xattr.c:107 [inline] ffff0000e599fa20 (&type->i_mutex_dir_key#8/2){+.+.}-{3:3}, at: delete_one_xattr+0xe8/0x2c8 fs/reiserfs/xattr.c:339 but task is already holding lock: ffff0000e599f380 (&type->i_mutex_dir_key#8/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:830 [inline] ffff0000e599f380 (&type->i_mutex_dir_key#8/3){+.+.}-{3:3}, at: reiserfs_for_each_xattr+0x788/0x8d8 fs/reiserfs/xattr.c:310 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&type->i_mutex_dir_key#8/3){+.+.}-{3:3}: down_write_nested+0x58/0xcc kernel/locking/rwsem.c:1695 inode_lock_nested include/linux/fs.h:830 [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_set_handle+0xe0/0xe8c fs/reiserfs/xattr.c:535 reiserfs_xattr_set+0x398/0x4b0 fs/reiserfs/xattr.c:635 trusted_set+0x98/0xec fs/reiserfs/xattr_trusted.c:31 __vfs_setxattr+0x3d8/0x400 fs/xattr.c:200 __vfs_setxattr_noperm+0x110/0x528 fs/xattr.c:234 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:295 vfs_setxattr+0x1a8/0x344 fs/xattr.c:321 do_setxattr fs/xattr.c:629 [inline] setxattr+0x208/0x29c fs/xattr.c:652 path_setxattr+0x17c/0x258 fs/xattr.c:671 __do_sys_lsetxattr fs/xattr.c:694 [inline] __se_sys_lsetxattr fs/xattr.c:690 [inline] __arm64_sys_lsetxattr+0xbc/0xd8 fs/xattr.c:690 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 -> #1 (&type->i_mutex_dir_key#8){+.+.}-{3:3}: down_write+0x50/0xc0 kernel/locking/rwsem.c:1579 inode_lock include/linux/fs.h:795 [inline] vfs_rename+0x5e4/0xc84 fs/namei.c:4845 do_renameat2+0x9c8/0xe40 fs/namei.c:5037 __do_sys_renameat2 fs/namei.c:5071 [inline] __se_sys_renameat2 fs/namei.c:5068 [inline] __arm64_sys_renameat2+0xe0/0xfc fs/namei.c:5068 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 -> #0 (&type->i_mutex_dir_key#8/2){+.+.}-{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+0x248/0x73c kernel/locking/lockdep.c:5754 down_write_nested+0x58/0xcc kernel/locking/rwsem.c:1695 inode_lock_nested include/linux/fs.h:830 [inline] xattr_rmdir fs/reiserfs/xattr.c:107 [inline] delete_one_xattr+0xe8/0x2c8 fs/reiserfs/xattr.c:339 reiserfs_for_each_xattr+0x794/0x8d8 fs/reiserfs/xattr.c:312 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:667 iput_final fs/inode.c:1741 [inline] iput+0x760/0x844 fs/inode.c:1767 d_delete_notify include/linux/fsnotify.h:307 [inline] vfs_rmdir+0x330/0x43c fs/namei.c:4219 do_rmdir+0x2e0/0x720 fs/namei.c:4265 __do_sys_unlinkat fs/namei.c:4441 [inline] __se_sys_unlinkat fs/namei.c:4435 [inline] __arm64_sys_unlinkat+0xe0/0xfc fs/namei.c:4435 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 other info that might help us debug this: Chain exists of: &type->i_mutex_dir_key#8/2 --> &type->i_mutex_dir_key#8 --> &type->i_mutex_dir_key#8/3 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&type->i_mutex_dir_key#8/3); lock(&type->i_mutex_dir_key#8); lock(&type->i_mutex_dir_key#8/3); lock(&type->i_mutex_dir_key#8/2); *** DEADLOCK *** 3 locks held by syz-executor.4/6149: #0: ffff0000e498a420 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:409 #1: ffff0000e599dfa0 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:830 [inline] #1: ffff0000e599dfa0 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: do_rmdir+0x1d8/0x720 fs/namei.c:4253 #2: ffff0000e599f380 (&type->i_mutex_dir_key#8/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:830 [inline] #2: ffff0000e599f380 (&type->i_mutex_dir_key#8/3){+.+.}-{3:3}, at: reiserfs_for_each_xattr+0x788/0x8d8 fs/reiserfs/xattr.c:310 stack backtrace: CPU: 1 PID: 6149 Comm: syz-executor.4 Not tainted 6.9.0-rc6-syzkaller-00046-g18daea77cca6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114 dump_stack+0x1c/0x28 lib/dump_stack.c:123 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+0x248/0x73c kernel/locking/lockdep.c:5754 down_write_nested+0x58/0xcc kernel/locking/rwsem.c:1695 inode_lock_nested include/linux/fs.h:830 [inline] xattr_rmdir fs/reiserfs/xattr.c:107 [inline] delete_one_xattr+0xe8/0x2c8 fs/reiserfs/xattr.c:339 reiserfs_for_each_xattr+0x794/0x8d8 fs/reiserfs/xattr.c:312 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:667 iput_final fs/inode.c:1741 [inline] iput+0x760/0x844 fs/inode.c:1767 d_delete_notify include/linux/fsnotify.h:307 [inline] vfs_rmdir+0x330/0x43c fs/namei.c:4219 do_rmdir+0x2e0/0x720 fs/namei.c:4265 __do_sys_unlinkat fs/namei.c:4441 [inline] __se_sys_unlinkat fs/namei.c:4435 [inline] __arm64_sys_unlinkat+0xe0/0xfc fs/namei.c:4435 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598