loop5: detected capacity change from 0 to 32768 BTRFS info (device loop5): using crc32c (crc32c-intel) checksum algorithm BTRFS info (device loop5): using free space tree BTRFS info (device loop5): enabling ssd optimizations BTRFS info (device loop5): auto enabling async discard ====================================================== WARNING: possible circular locking dependency detected 6.1.0-rc8-next-20221207-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/21565 is trying to acquire lock: ffff8880940ddc18 (btrfs-tree-01){++++}-{3:3}, at: __btrfs_tree_read_lock+0x32/0x350 fs/btrfs/locking.c:135 but task is already holding lock: ffff8880940dd078 (btrfs-tree-00){++++}-{3:3}, at: __btrfs_tree_read_lock+0x32/0x350 fs/btrfs/locking.c:135 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (btrfs-tree-00){++++}-{3:3}: down_read_nested+0x9e/0x450 kernel/locking/rwsem.c:1634 __btrfs_tree_read_lock+0x32/0x350 fs/btrfs/locking.c:135 btrfs_search_slot+0x13ba/0x2c90 fs/btrfs/ctree.c:2249 btrfs_init_root_free_objectid+0xc6/0x290 fs/btrfs/disk-io.c:5358 btrfs_init_fs_root fs/btrfs/disk-io.c:1551 [inline] btrfs_get_root_ref.part.0+0x706/0xba0 fs/btrfs/disk-io.c:1755 btrfs_get_root_ref fs/btrfs/disk-io.c:1729 [inline] btrfs_get_fs_root fs/btrfs/disk-io.c:1807 [inline] open_ctree+0x3fcf/0x4641 fs/btrfs/disk-io.c:3874 btrfs_fill_super fs/btrfs/super.c:1151 [inline] btrfs_mount_root.cold+0x15/0x162 fs/btrfs/super.c:1520 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x2f0 fs/super.c:1489 fc_mount fs/namespace.c:1149 [inline] vfs_kern_mount.part.0+0xd3/0x170 fs/namespace.c:1179 vfs_kern_mount+0x40/0x60 fs/namespace.c:1166 btrfs_mount+0x23f/0xa90 fs/btrfs/super.c:1580 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x2f0 fs/super.c:1489 do_new_mount fs/namespace.c:3145 [inline] path_mount+0x132a/0x1e20 fs/namespace.c:3475 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount fs/namespace.c:3674 [inline] __x64_sys_mount+0x283/0x300 fs/namespace.c:3674 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (btrfs-tree-01){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain kernel/locking/lockdep.c:3831 [inline] __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055 lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 down_read_nested+0x9e/0x450 kernel/locking/rwsem.c:1634 __btrfs_tree_read_lock+0x32/0x350 fs/btrfs/locking.c:135 btrfs_tree_read_lock fs/btrfs/locking.c:141 [inline] btrfs_read_lock_root_node+0x82/0x3a0 fs/btrfs/locking.c:280 btrfs_search_slot_get_root fs/btrfs/ctree.c:1779 [inline] btrfs_search_slot+0x3e1/0x2c90 fs/btrfs/ctree.c:2101 btrfs_lookup_inode+0xba/0x3e0 fs/btrfs/inode-item.c:412 btrfs_read_locked_inode+0xcd5/0x1520 fs/btrfs/inode.c:3983 btrfs_iget_path fs/btrfs/inode.c:5799 [inline] btrfs_iget+0x192/0x220 fs/btrfs/inode.c:5821 btrfs_search_path_in_tree_user fs/btrfs/ioctl.c:1960 [inline] btrfs_ioctl_ino_lookup_user+0x57f/0xba0 fs/btrfs/ioctl.c:2104 btrfs_ioctl+0x41a/0x5870 fs/btrfs/ioctl.c:4668 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(btrfs-tree-00); lock(btrfs-tree-01); lock(btrfs-tree-00); lock(btrfs-tree-01); *** DEADLOCK *** 1 lock held by syz-executor.5/21565: #0: ffff8880940dd078 (btrfs-tree-00){++++}-{3:3}, at: __btrfs_tree_read_lock+0x32/0x350 fs/btrfs/locking.c:135 stack backtrace: CPU: 1 PID: 21565 Comm: syz-executor.5 Not tainted 6.1.0-rc8-next-20221207-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2177 check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain kernel/locking/lockdep.c:3831 [inline] __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055 lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 down_read_nested+0x9e/0x450 kernel/locking/rwsem.c:1634 __btrfs_tree_read_lock+0x32/0x350 fs/btrfs/locking.c:135 btrfs_tree_read_lock fs/btrfs/locking.c:141 [inline] btrfs_read_lock_root_node+0x82/0x3a0 fs/btrfs/locking.c:280 btrfs_search_slot_get_root fs/btrfs/ctree.c:1779 [inline] btrfs_search_slot+0x3e1/0x2c90 fs/btrfs/ctree.c:2101 btrfs_lookup_inode+0xba/0x3e0 fs/btrfs/inode-item.c:412 btrfs_read_locked_inode+0xcd5/0x1520 fs/btrfs/inode.c:3983 btrfs_iget_path fs/btrfs/inode.c:5799 [inline] btrfs_iget+0x192/0x220 fs/btrfs/inode.c:5821 btrfs_search_path_in_tree_user fs/btrfs/ioctl.c:1960 [inline] btrfs_ioctl_ino_lookup_user+0x57f/0xba0 fs/btrfs/ioctl.c:2104 btrfs_ioctl+0x41a/0x5870 fs/btrfs/ioctl.c:4668 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fb2f7e8c0d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb2f8c29168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fb2f7fabf80 RCX: 00007fb2f7e8c0d9 RDX: 0000000020000500 RSI: 00000000d000943e RDI: 0000000000000004 RBP: 00007fb2f7ee7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff9dfb46af R14: 00007fb2f8c29300 R15: 0000000000022000