====================================================== WARNING: possible circular locking dependency detected 5.15.181-syzkaller #0 Not tainted ------------------------------------------------------ syz.5.425/6032 is trying to acquire lock: ffff0000de278980 (&type->i_mutex_dir_key#17/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline] ffff0000de278980 (&type->i_mutex_dir_key#17/3){+.+.}-{3:3}, at: open_xa_root fs/reiserfs/xattr.c:127 [inline] ffff0000de278980 (&type->i_mutex_dir_key#17/3){+.+.}-{3:3}, at: open_xa_dir+0x118/0x57c fs/reiserfs/xattr.c:152 but task is already holding lock: ffff0000d0e5a090 (&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+0x194/0x1edc kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743 reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27 reiserfs_mkdir+0x278/0x788 fs/reiserfs/namei.c:831 xattr_mkdir fs/reiserfs/xattr.c:76 [inline] open_xa_root fs/reiserfs/xattr.c:136 [inline] open_xa_dir+0x284/0x57c fs/reiserfs/xattr.c:152 xattr_lookup+0x3c/0x268 fs/reiserfs/xattr.c:395 reiserfs_xattr_set_handle+0xd8/0xb34 fs/reiserfs/xattr.c:540 reiserfs_xattr_set+0x388/0x4a8 fs/reiserfs/xattr.c:640 trusted_set+0x98/0xec fs/reiserfs/xattr_trusted.c:31 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182 __vfs_setxattr_noperm+0x120/0x564 fs/xattr.c:216 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277 vfs_setxattr+0x158/0x2ac fs/xattr.c:303 do_setxattr fs/xattr.c:588 [inline] setxattr+0x248/0x2ac fs/xattr.c:611 __do_sys_fsetxattr fs/xattr.c:667 [inline] __se_sys_fsetxattr fs/xattr.c:656 [inline] __arm64_sys_fsetxattr+0x1a8/0x224 fs/xattr.c:656 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 -> #0 (&type->i_mutex_dir_key#17/3){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2928/0x651c kernel/locking/lockdep.c:5012 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623 down_write_nested+0xc0/0x130 kernel/locking/rwsem.c:1667 inode_lock_nested include/linux/fs.h:822 [inline] open_xa_root fs/reiserfs/xattr.c:127 [inline] open_xa_dir+0x118/0x57c fs/reiserfs/xattr.c:152 reiserfs_for_each_xattr+0x16c/0x68c fs/reiserfs/xattr.c:252 reiserfs_delete_xattrs+0x2c/0xa4 fs/reiserfs/xattr.c:364 reiserfs_evict_inode+0x1d8/0x3e8 fs/reiserfs/inode.c:53 evict+0x3c8/0x810 fs/inode.c:647 iput_final fs/inode.c:1769 [inline] iput+0x6c4/0x77c fs/inode.c:1795 reiserfs_create+0x2c8/0x5a8 fs/reiserfs/namei.c:-1 lookup_open fs/namei.c:3462 [inline] open_last_lookups fs/namei.c:3532 [inline] path_openat+0x1144/0x26e4 fs/namei.c:3739 do_filp_open+0x164/0x330 fs/namei.c:3769 do_sys_openat2+0x128/0x3d8 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_openat fs/open.c:1285 [inline] __se_sys_openat fs/open.c:1280 [inline] __arm64_sys_openat+0x120/0x154 fs/open.c:1280 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->lock); lock(&type->i_mutex_dir_key#17/3); lock(&sbi->lock); lock(&type->i_mutex_dir_key#17/3); *** DEADLOCK *** 3 locks held by syz.5.425/6032: #0: ffff0000dc590460 (sb_writers#24){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:377 #1: ffff0000de2782e0 (&type->i_mutex_dir_key#17){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #1: ffff0000de2782e0 (&type->i_mutex_dir_key#17){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3529 [inline] #1: ffff0000de2782e0 (&type->i_mutex_dir_key#17){+.+.}-{3:3}, at: path_openat+0x5f4/0x26e4 fs/namei.c:3739 #2: ffff0000d0e5a090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock_nested+0x68/0xd8 fs/reiserfs/lock.c:78 stack backtrace: CPU: 1 PID: 6032 Comm: syz.5.425 Not tainted 5.15.181-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2011 check_noncircular+0x240/0x2d4 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2928/0x651c kernel/locking/lockdep.c:5012 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623 down_write_nested+0xc0/0x130 kernel/locking/rwsem.c:1667 inode_lock_nested include/linux/fs.h:822 [inline] open_xa_root fs/reiserfs/xattr.c:127 [inline] open_xa_dir+0x118/0x57c fs/reiserfs/xattr.c:152 reiserfs_for_each_xattr+0x16c/0x68c fs/reiserfs/xattr.c:252 reiserfs_delete_xattrs+0x2c/0xa4 fs/reiserfs/xattr.c:364 reiserfs_evict_inode+0x1d8/0x3e8 fs/reiserfs/inode.c:53 evict+0x3c8/0x810 fs/inode.c:647 iput_final fs/inode.c:1769 [inline] iput+0x6c4/0x77c fs/inode.c:1795 reiserfs_create+0x2c8/0x5a8 fs/reiserfs/namei.c:-1 lookup_open fs/namei.c:3462 [inline] open_last_lookups fs/namei.c:3532 [inline] path_openat+0x1144/0x26e4 fs/namei.c:3739 do_filp_open+0x164/0x330 fs/namei.c:3769 do_sys_openat2+0x128/0x3d8 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_openat fs/open.c:1285 [inline] __se_sys_openat fs/open.c:1280 [inline] __arm64_sys_openat+0x120/0x154 fs/open.c:1280 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584