====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.3.947/7803 is trying to acquire lock: ffff0000dab6e650 (sb_internal#2){.+.+}-{0:0}, at: btrfs_join_transaction+0x30/0x40 fs/btrfs/transaction.c:780 but task is already holding lock: ffff0000d98f4348 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] ffff0000d98f4348 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x144/0x294 mm/util.c:518 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0xc4/0x124 mm/memory.c:5850 filldir64+0x2cc/0x8fc fs/readdir.c:335 dir_emit_dot include/linux/fs.h:3698 [inline] dir_emit_dots include/linux/fs.h:3709 [inline] dcache_readdir+0x140/0x62c fs/libfs.c:197 iterate_dir+0x1f0/0x4cc fs/readdir.c:-1 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64 fs/readdir.c:354 [inline] __arm64_sys_getdents64+0x11c/0x320 fs/readdir.c:354 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #4 (&type->i_mutex_dir_key#2){++++}-{3:3}: down_read+0x64/0x300 kernel/locking/rwsem.c:1520 inode_lock_shared include/linux/fs.h:768 [inline] lookup_slow+0x4c/0x80 fs/namei.c:1714 walk_component+0x270/0x364 fs/namei.c:2006 lookup_last fs/namei.c:2463 [inline] path_lookupat+0x13c/0x3d0 fs/namei.c:2487 filename_lookup+0x1c4/0x480 fs/namei.c:2516 kern_path+0x48/0x6c fs/namei.c:2614 is_same_device fs/btrfs/volumes.c:695 [inline] device_list_add+0x129c/0x1c84 fs/btrfs/volumes.c:928 btrfs_scan_one_device+0x368/0x57c fs/btrfs/volumes.c:1461 btrfs_mount_root+0x45c/0x7d0 fs/btrfs/super.c:1796 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632 vfs_get_tree+0x90/0x274 fs/super.c:1573 fc_mount fs/namespace.c:1048 [inline] vfs_kern_mount+0xdc/0x178 fs/namespace.c:1078 btrfs_mount+0x2dc/0x974 fs/btrfs/super.c:1894 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632 vfs_get_tree+0x90/0x274 fs/super.c:1573 do_new_mount+0x228/0x810 fs/namespace.c:3078 path_mount+0x5bc/0xe80 fs/namespace.c:3408 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount fs/namespace.c:3606 [inline] __arm64_sys_mount+0x49c/0x59c fs/namespace.c:3606 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #3 (&fs_devs->device_list_mutex){+.+.}-{3:3}: __mutex_lock_common+0x190/0x1f60 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 insert_dev_extents fs/btrfs/block-group.c:2520 [inline] btrfs_create_pending_block_groups+0x470/0xda0 fs/btrfs/block-group.c:2571 __btrfs_end_transaction+0x134/0x5f0 fs/btrfs/transaction.c:1012 btrfs_end_transaction+0x24/0x34 fs/btrfs/transaction.c:1051 find_free_extent_update_loop fs/btrfs/extent-tree.c:4151 [inline] find_free_extent+0x39ec/0x471c fs/btrfs/extent-tree.c:4528 btrfs_reserve_extent+0x244/0x520 fs/btrfs/extent-tree.c:4621 cow_file_range+0x3e8/0xbb8 fs/btrfs/inode.c:1276 fallback_to_cow+0x490/0xa08 fs/btrfs/inode.c:1756 run_delalloc_nocow+0xb50/0xce8 fs/btrfs/inode.c:2163 btrfs_run_delalloc_range+0x33c/0xf0c fs/btrfs/inode.c:2225 writepage_delalloc+0x11c/0x2f4 fs/btrfs/extent_io.c:1980 __extent_writepage+0x528/0xc18 fs/btrfs/extent_io.c:2284 extent_write_cache_pages fs/btrfs/extent_io.c:3199 [inline] extent_writepages+0x93c/0x1074 fs/btrfs/extent_io.c:3321 btrfs_writepages+0x28/0x38 fs/btrfs/inode.c:8303 do_writepages+0x2b0/0x504 mm/page-writeback.c:2491 filemap_fdatawrite_wbc+0x124/0x174 mm/filemap.c:388 start_delalloc_inodes+0x598/0x91c fs/btrfs/inode.c:9827 btrfs_start_delalloc_roots+0x528/0x758 fs/btrfs/inode.c:9906 shrink_delalloc fs/btrfs/space-info.c:622 [inline] flush_space+0x4b8/0xc94 fs/btrfs/space-info.c:730 btrfs_async_reclaim_metadata_space+0x25c/0x308 fs/btrfs/space-info.c:1080 process_one_work+0x7f8/0x13a4 kernel/workqueue.c:2292 worker_thread+0x8c4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 -> #2 (btrfs_trans_num_extwriters){++++}-{0:0}: join_transaction+0x180/0xb68 fs/btrfs/transaction.c:303 start_transaction+0x854/0x1048 fs/btrfs/transaction.c:667 btrfs_start_transaction+0x34/0x44 fs/btrfs/transaction.c:766 btrfs_rebuild_free_space_tree+0xbc/0x6d8 fs/btrfs/free-space-tree.c:1320 btrfs_start_pre_rw_mount+0x2c8/0x658 fs/btrfs/disk-io.c:3237 open_ctree+0x1e44/0x2604 fs/btrfs/disk-io.c:3834 btrfs_fill_super+0x1b4/0x2d4 fs/btrfs/super.c:1469 btrfs_mount_root+0x780/0x7d0 fs/btrfs/super.c:1834 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632 vfs_get_tree+0x90/0x274 fs/super.c:1573 fc_mount fs/namespace.c:1048 [inline] vfs_kern_mount+0xdc/0x178 fs/namespace.c:1078 btrfs_mount+0x2dc/0x974 fs/btrfs/super.c:1894 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632 vfs_get_tree+0x90/0x274 fs/super.c:1573 do_new_mount+0x228/0x810 fs/namespace.c:3078 path_mount+0x5bc/0xe80 fs/namespace.c:3408 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount fs/namespace.c:3606 [inline] __arm64_sys_mount+0x49c/0x59c fs/namespace.c:3606 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #1 (btrfs_trans_num_writers){++++}-{0:0}: join_transaction+0x154/0xb68 fs/btrfs/transaction.c:302 start_transaction+0x854/0x1048 fs/btrfs/transaction.c:667 btrfs_start_transaction+0x34/0x44 fs/btrfs/transaction.c:766 btrfs_rebuild_free_space_tree+0xbc/0x6d8 fs/btrfs/free-space-tree.c:1320 btrfs_start_pre_rw_mount+0x2c8/0x658 fs/btrfs/disk-io.c:3237 open_ctree+0x1e44/0x2604 fs/btrfs/disk-io.c:3834 btrfs_fill_super+0x1b4/0x2d4 fs/btrfs/super.c:1469 btrfs_mount_root+0x780/0x7d0 fs/btrfs/super.c:1834 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632 vfs_get_tree+0x90/0x274 fs/super.c:1573 fc_mount fs/namespace.c:1048 [inline] vfs_kern_mount+0xdc/0x178 fs/namespace.c:1078 btrfs_mount+0x2dc/0x974 fs/btrfs/super.c:1894 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632 vfs_get_tree+0x90/0x274 fs/super.c:1573 do_new_mount+0x228/0x810 fs/namespace.c:3078 path_mount+0x5bc/0xe80 fs/namespace.c:3408 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount fs/namespace.c:3606 [inline] __arm64_sys_mount+0x49c/0x59c fs/namespace.c:3606 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #0 (sb_internal#2){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2880/0x6800 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1891 [inline] sb_start_intwrite include/linux/fs.h:2013 [inline] start_transaction+0x5c4/0x1048 fs/btrfs/transaction.c:661 btrfs_join_transaction+0x30/0x40 fs/btrfs/transaction.c:780 btrfs_dirty_inode+0xb4/0x1c0 fs/btrfs/inode.c:6277 btrfs_update_time+0x170/0x18c fs/btrfs/inode.c:6319 inode_update_time fs/inode.c:1958 [inline] touch_atime+0x368/0x7dc fs/inode.c:2031 file_accessed include/linux/fs.h:2600 [inline] btrfs_file_mmap+0xb0/0x11c fs/btrfs/file.c:2053 call_mmap include/linux/fs.h:2270 [inline] mmap_file+0x6c/0xc8 mm/util.c:1109 __mmap_region mm/mmap.c:2772 [inline] mmap_region+0xcec/0x1900 mm/mmap.c:2916 do_mmap+0x9cc/0x1138 mm/mmap.c:1436 vm_mmap_pgoff+0x190/0x294 mm/util.c:520 ksys_mmap_pgoff+0x3b8/0x5a0 mm/mmap.c:1482 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 other info that might help us debug this: Chain exists of: sb_internal#2 --> &type->i_mutex_dir_key#2 --> &mm->mmap_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mm->mmap_lock); lock(&type->i_mutex_dir_key#2); lock(&mm->mmap_lock); lock(sb_internal#2); *** DEADLOCK *** 2 locks held by syz.3.947/7803: #0: ffff0000d98f4348 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] #0: ffff0000d98f4348 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x144/0x294 mm/util.c:518 #1: ffff0000dab6e460 (sb_writers#22){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2600 [inline] #1: ffff0000dab6e460 (sb_writers#22){.+.+}-{0:0}, at: btrfs_file_mmap+0xb0/0x11c fs/btrfs/file.c:2053 stack backtrace: CPU: 0 PID: 7803 Comm: syz.3.947 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2048 check_noncircular+0x264/0x2f8 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2880/0x6800 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1891 [inline] sb_start_intwrite include/linux/fs.h:2013 [inline] start_transaction+0x5c4/0x1048 fs/btrfs/transaction.c:661 btrfs_join_transaction+0x30/0x40 fs/btrfs/transaction.c:780 btrfs_dirty_inode+0xb4/0x1c0 fs/btrfs/inode.c:6277 btrfs_update_time+0x170/0x18c fs/btrfs/inode.c:6319 inode_update_time fs/inode.c:1958 [inline] touch_atime+0x368/0x7dc fs/inode.c:2031 file_accessed include/linux/fs.h:2600 [inline] btrfs_file_mmap+0xb0/0x11c fs/btrfs/file.c:2053 call_mmap include/linux/fs.h:2270 [inline] mmap_file+0x6c/0xc8 mm/util.c:1109 __mmap_region mm/mmap.c:2772 [inline] mmap_region+0xcec/0x1900 mm/mmap.c:2916 do_mmap+0x9cc/0x1138 mm/mmap.c:1436 vm_mmap_pgoff+0x190/0x294 mm/util.c:520 ksys_mmap_pgoff+0x3b8/0x5a0 mm/mmap.c:1482 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585