====================================================== WARNING: possible circular locking dependency detected 6.8.0-rc2-syzkaller-g41bccc98fb79 #0 Not tainted ------------------------------------------------------ syz-executor.3/9947 is trying to acquire lock: ffff0000faeac520 (&type->i_mutex_dir_key#17/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:837 [inline] ffff0000faeac520 (&type->i_mutex_dir_key#17/3){+.+.}-{3:3}, at: open_xa_root fs/reiserfs/xattr.c:128 [inline] ffff0000faeac520 (&type->i_mutex_dir_key#17/3){+.+.}-{3:3}, at: open_xa_dir+0x11c/0x578 fs/reiserfs/xattr.c:153 but task is already holding lock: ffff0000faad0090 (&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:608 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27 reiserfs_mkdir+0x280/0x77c fs/reiserfs/namei.c:822 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_mknod+0x33c/0x5a8 fs/reiserfs/namei.c:739 vfs_mknod+0x330/0x360 fs/namei.c:4000 do_mknodat+0x42c/0x564 __do_sys_mknodat fs/namei.c:4078 [inline] __se_sys_mknodat fs/namei.c:4075 [inline] __arm64_sys_mknodat+0xb0/0xcc fs/namei.c:4075 __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:598 -> #0 (&type->i_mutex_dir_key#17/3){+.+.}-{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 xattr_lookup+0x3c/0x268 fs/reiserfs/xattr.c:396 reiserfs_xattr_get+0xf0/0x96c fs/reiserfs/xattr.c:679 security_get+0x94/0xd0 fs/reiserfs/xattr_security.c:19 __vfs_getxattr+0x394/0x3c0 fs/xattr.c:424 smk_fetch+0xc8/0x150 security/smack/smack_lsm.c:306 smack_d_instantiate+0x594/0x880 security/smack/smack_lsm.c:3575 security_d_instantiate+0x98/0xf0 security/security.c:3895 d_instantiate_new+0x64/0x120 fs/dcache.c:1897 reiserfs_mknod+0x508/0x5a8 fs/reiserfs/namei.c:769 vfs_mknod+0x330/0x360 fs/namei.c:4000 do_mknodat+0x42c/0x564 __do_sys_mknodat fs/namei.c:4078 [inline] __se_sys_mknodat fs/namei.c:4075 [inline] __arm64_sys_mknodat+0xb0/0xcc fs/namei.c:4075 __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:598 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-executor.3/9947: #0: ffff0000fb3ea420 (sb_writers#24){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:409 #1: ffff0000faeacbc0 (&type->i_mutex_dir_key#17/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:837 [inline] #1: ffff0000faeacbc0 (&type->i_mutex_dir_key#17/1){+.+.}-{3:3}, at: filename_create+0x204/0x468 fs/namei.c:3891 #2: ffff0000faad0090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock_nested+0x68/0xd8 fs/reiserfs/lock.c:78 stack backtrace: CPU: 1 PID: 9947 Comm: syz-executor.3 Not tainted 6.8.0-rc2-syzkaller-g41bccc98fb79 #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 xattr_lookup+0x3c/0x268 fs/reiserfs/xattr.c:396 reiserfs_xattr_get+0xf0/0x96c fs/reiserfs/xattr.c:679 security_get+0x94/0xd0 fs/reiserfs/xattr_security.c:19 __vfs_getxattr+0x394/0x3c0 fs/xattr.c:424 smk_fetch+0xc8/0x150 security/smack/smack_lsm.c:306 smack_d_instantiate+0x594/0x880 security/smack/smack_lsm.c:3575 security_d_instantiate+0x98/0xf0 security/security.c:3895 d_instantiate_new+0x64/0x120 fs/dcache.c:1897 reiserfs_mknod+0x508/0x5a8 fs/reiserfs/namei.c:769 vfs_mknod+0x330/0x360 fs/namei.c:4000 do_mknodat+0x42c/0x564 __do_sys_mknodat fs/namei.c:4078 [inline] __se_sys_mknodat fs/namei.c:4075 [inline] __arm64_sys_mknodat+0xb0/0xcc fs/namei.c:4075 __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:598