BTRFS info (device loop0): clearing free space tree BTRFS info (device loop0): clearing compat-ro feature flag for FREE_SPACE_TREE (0x1) BTRFS info (device loop0): clearing compat-ro feature flag for FREE_SPACE_TREE_VALID (0x2) ====================================================== WARNING: possible circular locking dependency detected 5.15.173-syzkaller #0 Not tainted ------------------------------------------------------ syz.0.14/4375 is trying to acquire lock: ffff8880599c6650 (sb_internal#2){.+.+}-{0:0}, at: btrfs_dirty_inode+0xcc/0x1c0 fs/btrfs/inode.c:6436 but task is already holding lock: ffff88805f895490 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline] ffff88805f895490 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: chown_common+0x499/0x890 fs/open.c:674 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&type->i_mutex_dir_key#8){++++}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498 inode_lock_shared include/linux/fs.h:799 [inline] lookup_slow+0x45/0x70 fs/namei.c:1679 walk_component+0x48c/0x610 fs/namei.c:1976 lookup_last fs/namei.c:2431 [inline] path_lookupat+0x16f/0x450 fs/namei.c:2455 filename_lookup+0x230/0x5c0 fs/namei.c:2484 kern_path+0x37/0x180 fs/namei.c:2582 lookup_bdev+0xc1/0x280 block/bdev.c:979 device_matched fs/btrfs/volumes.c:568 [inline] btrfs_free_stale_devices+0x71f/0xb00 fs/btrfs/volumes.c:608 btrfs_forget_devices+0x52/0x80 fs/btrfs/volumes.c:1395 btrfs_control_ioctl+0x108/0x210 fs/btrfs/super.c:2451 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+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #2 (&fs_devs->device_list_mutex){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __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 btrfs_run_dev_stats+0xeb/0xfd0 fs/btrfs/volumes.c:7949 commit_cowonly_roots+0x1cb/0x9d0 fs/btrfs/transaction.c:1290 btrfs_commit_transaction+0x13af/0x3800 fs/btrfs/transaction.c:2392 btrfs_clear_free_space_tree+0x755/0xbd0 fs/btrfs/free-space-tree.c:1264 btrfs_start_pre_rw_mount+0x2b0/0x680 fs/btrfs/disk-io.c:3079 open_ctree+0x2dcf/0x3500 fs/btrfs/disk-io.c:3634 btrfs_fill_super+0x1c7/0x2d0 fs/btrfs/super.c:1387 btrfs_mount_root+0x803/0x930 fs/btrfs/super.c:1752 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1530 fc_mount fs/namespace.c:1000 [inline] vfs_kern_mount+0xb8/0x150 fs/namespace.c:1030 btrfs_mount+0x395/0xb40 fs/btrfs/super.c:1812 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x2ba/0xb40 fs/namespace.c:3012 do_mount fs/namespace.c:3355 [inline] __do_sys_mount fs/namespace.c:3563 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #1 (&fs_info->tree_log_mutex){+.+.}-{3:3}: reacquire_held_locks+0x3a2/0x660 kernel/locking/lockdep.c:5150 __lock_release kernel/locking/lockdep.c:5339 [inline] lock_release+0x369/0x9a0 kernel/locking/lockdep.c:5643 __mutex_unlock_slowpath+0xde/0x750 kernel/locking/mutex.c:851 btrfs_commit_transaction+0x1e34/0x3800 fs/btrfs/transaction.c:2439 btrfs_clear_free_space_tree+0x755/0xbd0 fs/btrfs/free-space-tree.c:1264 btrfs_start_pre_rw_mount+0x2b0/0x680 fs/btrfs/disk-io.c:3079 open_ctree+0x2dcf/0x3500 fs/btrfs/disk-io.c:3634 btrfs_fill_super+0x1c7/0x2d0 fs/btrfs/super.c:1387 btrfs_mount_root+0x803/0x930 fs/btrfs/super.c:1752 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1530 fc_mount fs/namespace.c:1000 [inline] vfs_kern_mount+0xb8/0x150 fs/namespace.c:1030 btrfs_mount+0x395/0xb40 fs/btrfs/super.c:1812 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x2ba/0xb40 fs/namespace.c:3012 do_mount fs/namespace.c:3355 [inline] __do_sys_mount fs/namespace.c:3563 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (sb_internal#2){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1813 [inline] sb_start_intwrite include/linux/fs.h:1930 [inline] start_transaction+0x5a8/0x11a0 fs/btrfs/transaction.c:678 btrfs_dirty_inode+0xcc/0x1c0 fs/btrfs/inode.c:6436 btrfs_setattr+0x2d0/0xf70 fs/btrfs/inode.c:5495 notify_change+0xc6d/0xf50 fs/attr.c:505 chown_common+0x592/0x890 fs/open.c:680 do_fchownat+0x169/0x240 fs/open.c:711 __do_sys_lchown fs/open.c:736 [inline] __se_sys_lchown fs/open.c:734 [inline] __x64_sys_lchown+0x81/0x90 fs/open.c:734 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Chain exists of: sb_internal#2 --> &fs_devs->device_list_mutex --> &type->i_mutex_dir_key#8 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&type->i_mutex_dir_key#8); lock(&fs_devs->device_list_mutex); lock(&type->i_mutex_dir_key#8); lock(sb_internal#2); *** DEADLOCK *** 2 locks held by syz.0.14/4375: #0: ffff8880599c6460 (sb_writers#17){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377 #1: ffff88805f895490 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline] #1: ffff88805f895490 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: chown_common+0x499/0x890 fs/open.c:674 stack backtrace: CPU: 1 PID: 4375 Comm: syz.0.14 Not tainted 5.15.173-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 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+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1813 [inline] sb_start_intwrite include/linux/fs.h:1930 [inline] start_transaction+0x5a8/0x11a0 fs/btrfs/transaction.c:678 btrfs_dirty_inode+0xcc/0x1c0 fs/btrfs/inode.c:6436 btrfs_setattr+0x2d0/0xf70 fs/btrfs/inode.c:5495 notify_change+0xc6d/0xf50 fs/attr.c:505 chown_common+0x592/0x890 fs/open.c:680 do_fchownat+0x169/0x240 fs/open.c:711 __do_sys_lchown fs/open.c:736 [inline] __se_sys_lchown fs/open.c:734 [inline] __x64_sys_lchown+0x81/0x90 fs/open.c:734 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fe2289a6ed9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe22681d058 EFLAGS: 00000246 ORIG_RAX: 000000000000005e RAX: ffffffffffffffda RBX: 00007fe228b6cfa0 RCX: 00007fe2289a6ed9 RDX: 0000000000000000 RSI: 000000000000ee00 RDI: 0000000020000000 RBP: 00007fe228a1acc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fe228b6cfa0 R15: 00007ffdbb79c078