====================================================== WARNING: possible circular locking dependency detected 5.15.123-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/6047 is trying to acquire lock: ffff88807a006090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x76/0xd0 fs/reiserfs/lock.c:27 but task is already holding lock: ffff8880737996c0 (&type->i_mutex_dir_key#13/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline] ffff8880737996c0 (&type->i_mutex_dir_key#13/1){+.+.}-{3:3}, at: filename_create+0x256/0x530 fs/namei.c:3765 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&type->i_mutex_dir_key#13/1){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 down_write_nested+0xa0/0x180 kernel/locking/rwsem.c:1657 inode_lock_nested include/linux/fs.h:822 [inline] filename_create+0x256/0x530 fs/namei.c:3765 do_mkdirat+0xb3/0x520 fs/namei.c:4009 __do_sys_mkdirat fs/namei.c:4034 [inline] __se_sys_mkdirat fs/namei.c:4032 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4032 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb -> #1 (sb_writers#23){.+.+}-{0:0}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1742 [inline] sb_start_write+0x4f/0x1c0 include/linux/fs.h:1812 mnt_want_write_file+0x5a/0x1f0 fs/namespace.c:421 reiserfs_ioctl+0x170/0x340 fs/reiserfs/ioctl.c:103 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb -> #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+0x1646/0x58b0 kernel/locking/lockdep.c:3787 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5011 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __mutex_lock_common+0x1da/0x25a0 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+0x76/0xd0 fs/reiserfs/lock.c:27 reiserfs_lookup+0x15c/0x4b0 fs/reiserfs/namei.c:364 __lookup_hash+0x117/0x240 fs/namei.c:1560 filename_create+0x28d/0x530 fs/namei.c:3766 do_mkdirat+0xb3/0x520 fs/namei.c:4009 __do_sys_mkdirat fs/namei.c:4034 [inline] __se_sys_mkdirat fs/namei.c:4032 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4032 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb other info that might help us debug this: Chain exists of: &sbi->lock --> sb_writers#23 --> &type->i_mutex_dir_key#13/1 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&type->i_mutex_dir_key#13/1 ); lock(sb_writers#23); lock(&type->i_mutex_dir_key#13/1); lock(&sbi->lock); *** DEADLOCK *** 2 locks held by syz-executor.1/6047: #0: ffff888085c8a460 (sb_writers#23){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377 #1: ffff8880737996c0 (&type->i_mutex_dir_key#13/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline] #1: ffff8880737996c0 (&type->i_mutex_dir_key#13/1){+.+.}-{3:3}, at: filename_create+0x256/0x530 fs/namei.c:3765 stack backtrace: CPU: 0 PID: 6047 Comm: syz-executor.1 Not tainted 5.15.123-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 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+0x1646/0x58b0 kernel/locking/lockdep.c:3787 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5011 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __mutex_lock_common+0x1da/0x25a0 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+0x76/0xd0 fs/reiserfs/lock.c:27 reiserfs_lookup+0x15c/0x4b0 fs/reiserfs/namei.c:364 __lookup_hash+0x117/0x240 fs/namei.c:1560 filename_create+0x28d/0x530 fs/namei.c:3766 do_mkdirat+0xb3/0x520 fs/namei.c:4009 __do_sys_mkdirat fs/namei.c:4034 [inline] __se_sys_mkdirat fs/namei.c:4032 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4032 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f349420fae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f34927910c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f349432ef80 RCX: 00007f349420fae9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: ffffffffffffff9c RBP: 00007f349425b47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f349432ef80 R15: 00007ffcc05a5b38 overlayfs: upper fs needs to support d_type. overlayfs: upper fs does not support tmpfile. overlayfs: upper fs does not support RENAME_WHITEOUT. overlayfs: failed to set xattr on upper overlayfs: ...falling back to index=off,metacopy=off.