====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.954/12192 is trying to acquire lock: ffff88801f146090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x75/0xd0 fs/reiserfs/lock.c:27 but task is already holding lock: ffff88805c16f380 (&type->i_mutex_dir_key#17/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline] ffff88805c16f380 (&type->i_mutex_dir_key#17/3){+.+.}-{3:3}, at: open_xa_root fs/reiserfs/xattr.c:127 [inline] ffff88805c16f380 (&type->i_mutex_dir_key#17/3){+.+.}-{3:3}, at: open_xa_dir+0x155/0x680 fs/reiserfs/xattr.c:152 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&type->i_mutex_dir_key#17/3){+.+.}-{3:3}: down_write_nested+0x3b/0x60 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+0x155/0x680 fs/reiserfs/xattr.c:152 reiserfs_for_each_xattr+0x1b6/0x820 fs/reiserfs/xattr.c:252 reiserfs_delete_xattrs+0x1c/0x80 fs/reiserfs/xattr.c:364 reiserfs_evict_inode+0x24b/0x4c0 fs/reiserfs/inode.c:53 evict+0x4c9/0x8d0 fs/inode.c:647 reiserfs_mkdir+0x7e5/0x920 fs/reiserfs/namei.c:873 vfs_mkdir+0x387/0x570 fs/namei.c:4073 do_mkdirat+0x1df/0x5b0 fs/namei.c:4098 __do_sys_mkdir fs/namei.c:4118 [inline] __se_sys_mkdir fs/namei.c:4116 [inline] __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4116 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (&sbi->lock){+.+.}-{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+0x2c42/0x7d10 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1e3/0x2400 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 reiserfs_write_lock+0x75/0xd0 fs/reiserfs/lock.c:27 reiserfs_mkdir+0x308/0x920 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+0x309/0x680 fs/reiserfs/xattr.c:152 xattr_lookup+0x22/0x2a0 fs/reiserfs/xattr.c:395 reiserfs_xattr_set_handle+0x101/0xf70 fs/reiserfs/xattr.c:540 reiserfs_xattr_set+0x467/0x590 fs/reiserfs/xattr.c:640 __vfs_setxattr+0x3e0/0x420 fs/xattr.c:182 __vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216 vfs_setxattr+0x167/0x2e0 fs/xattr.c:303 do_setxattr fs/xattr.c:588 [inline] setxattr+0x36c/0x390 fs/xattr.c:611 __do_sys_fsetxattr fs/xattr.c:667 [inline] __se_sys_fsetxattr+0x15e/0x1d0 fs/xattr.c:656 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&type->i_mutex_dir_key#17/3); lock(&sbi->lock); lock(&type->i_mutex_dir_key#17/3); lock(&sbi->lock); *** DEADLOCK *** 3 locks held by syz.0.954/12192: #0: ffff88801998c460 (sb_writers#23){.+.+}-{0:0}, at: mnt_want_write_file+0x5c/0x200 fs/namespace.c:430 #1: ffff88805c16ece0 (&sb->s_type->i_mutex_key#27){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #1: ffff88805c16ece0 (&sb->s_type->i_mutex_key#27){+.+.}-{3:3}, at: vfs_setxattr+0x140/0x2e0 fs/xattr.c:302 #2: ffff88805c16f380 (&type->i_mutex_dir_key#17/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline] #2: ffff88805c16f380 (&type->i_mutex_dir_key#17/3){+.+.}-{3:3}, at: open_xa_root fs/reiserfs/xattr.c:127 [inline] #2: ffff88805c16f380 (&type->i_mutex_dir_key#17/3){+.+.}-{3:3}, at: open_xa_dir+0x155/0x680 fs/reiserfs/xattr.c:152 stack backtrace: CPU: 0 PID: 12192 Comm: syz.0.954 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 check_noncircular+0x296/0x330 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+0x2c42/0x7d10 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1e3/0x2400 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 reiserfs_write_lock+0x75/0xd0 fs/reiserfs/lock.c:27 reiserfs_mkdir+0x308/0x920 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+0x309/0x680 fs/reiserfs/xattr.c:152 xattr_lookup+0x22/0x2a0 fs/reiserfs/xattr.c:395 reiserfs_xattr_set_handle+0x101/0xf70 fs/reiserfs/xattr.c:540 reiserfs_xattr_set+0x467/0x590 fs/reiserfs/xattr.c:640 __vfs_setxattr+0x3e0/0x420 fs/xattr.c:182 __vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216 vfs_setxattr+0x167/0x2e0 fs/xattr.c:303 do_setxattr fs/xattr.c:588 [inline] setxattr+0x36c/0x390 fs/xattr.c:611 __do_sys_fsetxattr fs/xattr.c:667 [inline] __se_sys_fsetxattr+0x15e/0x1d0 fs/xattr.c:656 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fda21565819 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:00007fda1f79e028 EFLAGS: 00000246 ORIG_RAX: 00000000000000be RAX: ffffffffffffffda RBX: 00007fda217df090 RCX: 00007fda21565819 RDX: 0000000000000000 RSI: 0000200000000180 RDI: 0000000000000004 RBP: 00007fda215fbc91 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fda217df128 R14: 00007fda217df090 R15: 00007ffdea39b348