REISERFS (device loop0): checking transaction log (loop0) REISERFS (device loop0): Using tea hash to sort names REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage. ====================================================== WARNING: possible circular locking dependency detected 6.8.0-rc5-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/5429 is trying to acquire lock: ffff888063aa82e0 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] ffff888063aa82e0 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: vfs_setxattr+0x1e1/0x420 fs/xattr.c:321 but task is already holding lock: ffff888029b2c420 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sb_writers#13){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1641 [inline] sb_start_write+0x4d/0x1c0 include/linux/fs.h:1777 mnt_want_write_file+0x61/0x200 fs/namespace.c:453 reiserfs_ioctl+0x178/0x2f0 fs/reiserfs/ioctl.c:103 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x85/0x160 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b -> #1 (&sbi->lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd60 kernel/locking/mutex.c:752 reiserfs_write_lock+0x7a/0xd0 fs/reiserfs/lock.c:27 reiserfs_lookup+0x162/0x580 fs/reiserfs/namei.c:364 __lookup_slow+0x282/0x3e0 fs/namei.c:1693 lookup_one_len+0x18b/0x2d0 fs/namei.c:2759 reiserfs_lookup_privroot+0x89/0x180 fs/reiserfs/xattr.c:977 reiserfs_fill_super+0x21c1/0x2620 fs/reiserfs/super.c:2174 mount_bdev+0x206/0x2d0 fs/super.c:1658 legacy_get_tree+0xef/0x190 fs/fs_context.c:662 vfs_get_tree+0x8c/0x280 fs/super.c:1779 do_new_mount+0x2be/0xb40 fs/namespace.c:3352 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x85/0x160 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b -> #0 (&type->i_mutex_dir_key#8){+.+.}-{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+0x3a21/0x7fb0 kernel/locking/lockdep.c:5137 lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5754 down_write+0x3a/0x50 kernel/locking/rwsem.c:1579 inode_lock include/linux/fs.h:804 [inline] vfs_setxattr+0x1e1/0x420 fs/xattr.c:321 do_setxattr fs/xattr.c:630 [inline] setxattr+0x25d/0x2f0 fs/xattr.c:653 path_setxattr+0x1c0/0x2a0 fs/xattr.c:672 __do_sys_setxattr fs/xattr.c:688 [inline] __se_sys_setxattr fs/xattr.c:684 [inline] __x64_sys_setxattr+0xbb/0xd0 fs/xattr.c:684 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x85/0x160 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b other info that might help us debug this: Chain exists of: &type->i_mutex_dir_key#8 --> &sbi->lock --> sb_writers#13 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_writers#13); lock(&sbi->lock); lock(sb_writers#13); lock(&type->i_mutex_dir_key#8); *** DEADLOCK *** 1 lock held by syz-executor.0/5429: #0: ffff888029b2c420 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409 stack backtrace: CPU: 0 PID: 5429 Comm: syz-executor.0 Not tainted 6.8.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 check_noncircular+0x375/0x4a0 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+0x3a21/0x7fb0 kernel/locking/lockdep.c:5137 lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5754 down_write+0x3a/0x50 kernel/locking/rwsem.c:1579 inode_lock include/linux/fs.h:804 [inline] vfs_setxattr+0x1e1/0x420 fs/xattr.c:321 do_setxattr fs/xattr.c:630 [inline] setxattr+0x25d/0x2f0 fs/xattr.c:653 path_setxattr+0x1c0/0x2a0 fs/xattr.c:672 __do_sys_setxattr fs/xattr.c:688 [inline] __se_sys_setxattr fs/xattr.c:684 [inline] __x64_sys_setxattr+0xbb/0xd0 fs/xattr.c:684 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x85/0x160 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f882da7dda9 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:00007f882e8970c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: ffffffffffffffda RBX: 00007f882dbabf80 RCX: 00007f882da7dda9 RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000020000080 RBP: 00007f882daca47a R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f882dbabf80 R15: 00007ffebbfb7d78