loop4: detected capacity change from 0 to 32768 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.4.307/8067 is trying to acquire lock: ffff88805c51cd38 (&type->i_mutex_dir_key#5){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:995 [inline] ffff88805c51cd38 (&type->i_mutex_dir_key#5){++++}-{4:4}, at: lookup_slow+0x46/0x70 fs/namei.c:1832 but task is already holding lock: ffff888038a478c8 (&fs_devs->device_list_mutex){+.+.}-{4:4}, at: device_list_add+0x595/0x22a0 fs/btrfs/volumes.c:839 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&fs_devs->device_list_mutex){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/rtmutex_api.c:535 [inline] mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:547 btrfs_run_dev_stats+0x102/0x10e0 fs/btrfs/volumes.c:7777 commit_cowonly_roots+0x1b2/0x860 fs/btrfs/transaction.c:1348 btrfs_commit_transaction+0xfc7/0x3950 fs/btrfs/transaction.c:2459 btrfs_ioctl_subvol_setflags+0x4dd/0x820 fs/btrfs/ioctl.c:1432 btrfs_ioctl+0x93d/0xd00 fs/btrfs/ioctl.c:5255 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #4 (&fs_info->reloc_mutex){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/rtmutex_api.c:535 [inline] mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:547 btrfs_record_root_in_trans+0x14f/0x180 fs/btrfs/transaction.c:503 start_transaction+0x3a4/0x1620 fs/btrfs/transaction.c:779 btrfs_ioctl_subvol_setflags+0x461/0x820 fs/btrfs/ioctl.c:1419 btrfs_ioctl+0x93d/0xd00 fs/btrfs/ioctl.c:5255 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #3 (btrfs_trans_num_extwriters){++++}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 join_transaction+0x1a4/0xca0 fs/btrfs/transaction.c:321 start_transaction+0x6b6/0x1620 fs/btrfs/transaction.c:705 btrfs_ioctl_subvol_setflags+0x461/0x820 fs/btrfs/ioctl.c:1419 btrfs_ioctl+0x93d/0xd00 fs/btrfs/ioctl.c:5255 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (btrfs_trans_num_writers){++++}-{0:0}: reacquire_held_locks+0x127/0x1d0 kernel/locking/lockdep.c:5385 __lock_release kernel/locking/lockdep.c:5574 [inline] lock_release+0x1b4/0x3e0 kernel/locking/lockdep.c:5889 percpu_up_read include/linux/percpu-rwsem.h:112 [inline] __sb_end_write include/linux/fs.h:1911 [inline] sb_end_intwrite+0x26/0x1c0 include/linux/fs.h:2028 __btrfs_end_transaction+0x248/0x640 fs/btrfs/transaction.c:1076 btrfs_dirty_inode+0x14c/0x190 fs/btrfs/inode.c:6284 inode_update_time fs/inode.c:2117 [inline] touch_atime+0x2f9/0x6d0 fs/inode.c:2190 file_accessed include/linux/fs.h:2673 [inline] btrfs_file_mmap_prepare+0xde/0x150 fs/btrfs/file.c:2049 vfs_mmap_prepare include/linux/fs.h:2410 [inline] call_mmap_prepare mm/vma.c:2586 [inline] __mmap_region mm/vma.c:2654 [inline] mmap_region+0xb52/0x20f0 mm/vma.c:2740 do_mmap+0xc23/0x10c0 mm/mmap.c:558 vm_mmap_pgoff+0x2a9/0x4d0 mm/util.c:581 ksys_mmap_pgoff+0x4e9/0x720 mm/mmap.c:604 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&mm->mmap_lock){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_read_killable+0x9d/0x220 kernel/locking/rwsem.c:1560 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:377 get_mmap_lock_carefully mm/mmap_lock.c:377 [inline] lock_mm_and_find_vma+0x2a8/0x300 mm/mmap_lock.c:428 do_user_addr_fault+0x331/0x1380 arch/x86/mm/fault.c:1359 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 user_access_begin arch/x86/include/asm/uaccess.h:-1 [inline] filldir64+0x29d/0x690 fs/readdir.c:373 dir_emit_dot include/linux/fs.h:3990 [inline] dir_emit_dots include/linux/fs.h:4001 [inline] offset_readdir+0x1e6/0x560 fs/libfs.c:569 iterate_dir+0x3a5/0x580 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:410 [inline] __se_sys_getdents64+0xe4/0x260 fs/readdir.c:396 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&type->i_mutex_dir_key#5){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_read+0x97/0x1f0 kernel/locking/rwsem.c:1537 inode_lock_shared include/linux/fs.h:995 [inline] lookup_slow+0x46/0x70 fs/namei.c:1832 walk_component+0x2d2/0x400 fs/namei.c:2151 lookup_last fs/namei.c:2652 [inline] path_lookupat+0x163/0x430 fs/namei.c:2676 filename_lookup+0x212/0x570 fs/namei.c:2705 kern_path+0x35/0x50 fs/namei.c:2863 is_same_device fs/btrfs/volumes.c:759 [inline] device_list_add+0xe2a/0x22a0 fs/btrfs/volumes.c:894 btrfs_scan_one_device+0x3ee/0x650 fs/btrfs/volumes.c:1493 btrfs_get_tree_super fs/btrfs/super.c:1865 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2094 [inline] btrfs_get_tree+0x4ab/0x1920 fs/btrfs/super.c:2128 vfs_get_tree+0x92/0x2b0 fs/super.c:1751 fc_mount fs/namespace.c:1208 [inline] do_new_mount_fc fs/namespace.c:3651 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3727 do_mount fs/namespace.c:4050 [inline] __do_sys_mount fs/namespace.c:4238 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4215 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &type->i_mutex_dir_key#5 --> &fs_info->reloc_mutex --> &fs_devs->device_list_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&fs_devs->device_list_mutex); lock(&fs_info->reloc_mutex); lock(&fs_devs->device_list_mutex); rlock(&type->i_mutex_dir_key#5); *** DEADLOCK *** 2 locks held by syz.4.307/8067: #0: ffffffff8db56eb8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_super fs/btrfs/super.c:1859 [inline] #0: ffffffff8db56eb8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_subvol fs/btrfs/super.c:2094 [inline] #0: ffffffff8db56eb8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree+0x47c/0x1920 fs/btrfs/super.c:2128 #1: ffff888038a478c8 (&fs_devs->device_list_mutex){+.+.}-{4:4}, at: device_list_add+0x595/0x22a0 fs/btrfs/volumes.c:839 stack backtrace: CPU: 1 UID: 0 PID: 8067 Comm: syz.4.307 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2043 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_read+0x97/0x1f0 kernel/locking/rwsem.c:1537 inode_lock_shared include/linux/fs.h:995 [inline] lookup_slow+0x46/0x70 fs/namei.c:1832 walk_component+0x2d2/0x400 fs/namei.c:2151 lookup_last fs/namei.c:2652 [inline] path_lookupat+0x163/0x430 fs/namei.c:2676 filename_lookup+0x212/0x570 fs/namei.c:2705 kern_path+0x35/0x50 fs/namei.c:2863 is_same_device fs/btrfs/volumes.c:759 [inline] device_list_add+0xe2a/0x22a0 fs/btrfs/volumes.c:894 btrfs_scan_one_device+0x3ee/0x650 fs/btrfs/volumes.c:1493 btrfs_get_tree_super fs/btrfs/super.c:1865 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2094 [inline] btrfs_get_tree+0x4ab/0x1920 fs/btrfs/super.c:2128 vfs_get_tree+0x92/0x2b0 fs/super.c:1751 fc_mount fs/namespace.c:1208 [inline] do_new_mount_fc fs/namespace.c:3651 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3727 do_mount fs/namespace.c:4050 [inline] __do_sys_mount fs/namespace.c:4238 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4215 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7c1a26076a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7c184bde68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f7c184bdef0 RCX: 00007f7c1a26076a RDX: 00002000000004c0 RSI: 00002000000015c0 RDI: 00007f7c184bdeb0 RBP: 00002000000004c0 R08: 00007f7c184bdef0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00002000000015c0 R13: 00007f7c184bdeb0 R14: 000000000000559e R15: 0000200000000180 BTRFS info (device loop4): first mount of filesystem 395ef67a-297e-477c-816d-cd80a5b93e5d BTRFS info (device loop4): using sha256 (sha256-lib) checksum algorithm BTRFS warning (device loop4): space cache v1 is being deprecated and will be removed in a future release, please use -o space_cache=v2 BTRFS info (device loop4): rebuilding free space tree BTRFS info (device loop4): disabling free space tree BTRFS info (device loop4): clearing compat-ro feature flag for FREE_SPACE_TREE (0x1) BTRFS info (device loop4): clearing compat-ro feature flag for FREE_SPACE_TREE_VALID (0x2) BTRFS info (device loop4): enabling ssd optimizations BTRFS info (device loop4): enabling disk space caching BTRFS info (device loop4): force clearing of disk cache BTRFS info (device loop4): enabling auto defrag BTRFS info (device loop4): max_inline set to 0 BTRFS info (device loop4): last unmount of filesystem 395ef67a-297e-477c-816d-cd80a5b93e5d