bcachefs (loop4): btree_path_down(): fatal error node not found at pos 536870913:1:U32_MAX within parent node u64s 5 type btree_ptr SPOS_MAX len 0 ver 0 ====================================================== WARNING: possible circular locking dependency detected 6.14.0-rc6-syzkaller-g059f6cbcfa70 #0 Not tainted ------------------------------------------------------ syz.4.567/9707 is trying to acquire lock: ffff0000ea394140 (bcachefs_btree){+.+.}-{0:0}, at: trans_set_locked+0x5c/0x1a4 fs/bcachefs/btree_locking.h:197 but task is already holding lock: ffff0000f7e599b0 (mapping.invalidate_lock#6){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] ffff0000f7e599b0 (mapping.invalidate_lock#6){.+.+}-{4:4}, at: filemap_fault+0x524/0x1518 mm/filemap.c:3434 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (mapping.invalidate_lock#6){.+.+}-{4:4}: down_read+0x58/0x2fc kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] filemap_fault+0x524/0x1518 mm/filemap.c:3434 bch2_page_fault+0x34c/0x808 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0xf8/0x498 mm/memory.c:4990 do_read_fault mm/memory.c:5410 [inline] do_fault mm/memory.c:5544 [inline] do_pte_missing mm/memory.c:4060 [inline] handle_pte_fault+0x3504/0x57b0 mm/memory.c:5907 __handle_mm_fault mm/memory.c:6050 [inline] handle_mm_fault+0xfa8/0x188c mm/memory.c:6219 do_page_fault+0x574/0x10ac arch/arm64/mm/fault.c:690 do_translation_fault+0xc4/0x114 arch/arm64/mm/fault.c:783 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:919 el0_da+0x60/0x178 arch/arm64/kernel/entry-common.c:604 el0t_64_sync_handler+0xcc/0x108 arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #2 (&mm->mmap_lock){++++}-{4:4}: __might_fault+0xc4/0x124 mm/memory.c:6858 _inline_copy_to_user include/linux/uaccess.h:192 [inline] copy_to_user include/linux/uaccess.h:223 [inline] copy_to_user_errcode+0x60/0x198 fs/bcachefs/util.h:686 bch2_ioctl_read_super fs/bcachefs/chardev.c:576 [inline] bch2_fs_ioctl+0x27b0/0x422c fs/bcachefs/chardev.c:684 bch2_fs_file_ioctl+0x8dc/0x2a18 fs/bcachefs/fs-ioctl.c:598 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __arm64_sys_ioctl+0x14c/0x1cc fs/ioctl.c:892 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #1 (&c->sb_lock){+.+.}-{4:4}: __mutex_lock_common+0x1f0/0x24b8 kernel/locking/mutex.c:585 __mutex_lock kernel/locking/mutex.c:730 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:782 __bch2_trans_mark_dev_sb fs/bcachefs/buckets.c:1081 [inline] bch2_trans_mark_dev_sb+0xdc/0x6c8 fs/bcachefs/buckets.c:1128 bch2_trans_mark_dev_sbs_flags+0x754/0x7b4 fs/bcachefs/buckets.c:1138 bch2_mark_superblocks fs/bcachefs/btree_gc.c:748 [inline] bch2_check_allocations+0x5f0/0x463c fs/bcachefs/btree_gc.c:1033 bch2_run_recovery_pass+0xe4/0x1d4 fs/bcachefs/recovery_passes.c:226 bch2_run_recovery_passes+0x260/0x92c fs/bcachefs/recovery_passes.c:291 bch2_fs_recovery+0x20e0/0x32ec fs/bcachefs/recovery.c:936 bch2_fs_start+0x32c/0x570 fs/bcachefs/super.c:1041 bch2_fs_get_tree+0xa50/0x11d4 fs/bcachefs/fs.c:2203 vfs_get_tree+0x90/0x28c fs/super.c:1814 do_new_mount+0x278/0x900 fs/namespace.c:3560 path_mount+0x590/0xe04 fs/namespace.c:3887 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount fs/namespace.c:4088 [inline] __arm64_sys_mount+0x4f4/0x5d0 fs/namespace.c:4088 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #0 (bcachefs_btree){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain kernel/locking/lockdep.c:3906 [inline] __lock_acquire+0x34f0/0x7904 kernel/locking/lockdep.c:5228 lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5851 trans_set_locked+0x88/0x1a4 fs/bcachefs/btree_locking.h:198 bch2_trans_begin+0x6fc/0x980 fs/bcachefs/btree_iter.c:3305 bch2_inum_err_msg_trans+0x78/0x1c0 fs/bcachefs/error.c:540 bch2_inum_offset_err_msg_trans+0x44/0x78 fs/bcachefs/error.c:550 bchfs_read+0x1ab4/0x1dc0 fs/bcachefs/fs-io-buffered.c:235 bch2_read_single_folio+0x460/0x67c fs/bcachefs/fs-io-buffered.c:335 bch2_read_folio+0x40/0x88 fs/bcachefs/fs-io-buffered.c:353 filemap_read_folio+0x108/0x318 mm/filemap.c:2390 filemap_fault+0xedc/0x1518 mm/filemap.c:3569 bch2_page_fault+0x34c/0x808 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0xf8/0x498 mm/memory.c:4990 do_read_fault mm/memory.c:5410 [inline] do_fault mm/memory.c:5544 [inline] do_pte_missing mm/memory.c:4060 [inline] handle_pte_fault+0x3504/0x57b0 mm/memory.c:5907 __handle_mm_fault mm/memory.c:6050 [inline] handle_mm_fault+0xfa8/0x188c mm/memory.c:6219 do_page_fault+0x574/0x10ac arch/arm64/mm/fault.c:690 do_translation_fault+0xc4/0x114 arch/arm64/mm/fault.c:783 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:919 el0_da+0x60/0x178 arch/arm64/kernel/entry-common.c:604 el0t_64_sync_handler+0xcc/0x108 arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 other info that might help us debug this: Chain exists of: bcachefs_btree --> &mm->mmap_lock --> mapping.invalidate_lock#6 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(mapping.invalidate_lock#6); lock(&mm->mmap_lock); lock(mapping.invalidate_lock#6); lock(bcachefs_btree); *** DEADLOCK *** 2 locks held by syz.4.567/9707: #0: ffff0000dc46c5d0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:209 [inline] #0: ffff0000dc46c5d0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/memory.c:6256 [inline] #0: ffff0000dc46c5d0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x38/0x2d8 mm/memory.c:6316 #1: ffff0000f7e599b0 (mapping.invalidate_lock#6){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] #1: ffff0000f7e599b0 (mapping.invalidate_lock#6){.+.+}-{4:4}, at: filemap_fault+0x524/0x1518 mm/filemap.c:3434 stack backtrace: CPU: 1 UID: 0 PID: 9707 Comm: syz.4.567 Not tainted 6.14.0-rc6-syzkaller-g059f6cbcfa70 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x154/0x1c0 kernel/locking/lockdep.c:2076 check_noncircular+0x310/0x404 kernel/locking/lockdep.c:2208 check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain kernel/locking/lockdep.c:3906 [inline] __lock_acquire+0x34f0/0x7904 kernel/locking/lockdep.c:5228 lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5851 trans_set_locked+0x88/0x1a4 fs/bcachefs/btree_locking.h:198 bch2_trans_begin+0x6fc/0x980 fs/bcachefs/btree_iter.c:3305 bch2_inum_err_msg_trans+0x78/0x1c0 fs/bcachefs/error.c:540 bch2_inum_offset_err_msg_trans+0x44/0x78 fs/bcachefs/error.c:550 bchfs_read+0x1ab4/0x1dc0 fs/bcachefs/fs-io-buffered.c:235 bch2_read_single_folio+0x460/0x67c fs/bcachefs/fs-io-buffered.c:335 bch2_read_folio+0x40/0x88 fs/bcachefs/fs-io-buffered.c:353 filemap_read_folio+0x108/0x318 mm/filemap.c:2390 filemap_fault+0xedc/0x1518 mm/filemap.c:3569 bch2_page_fault+0x34c/0x808 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0xf8/0x498 mm/memory.c:4990 do_read_fault mm/memory.c:5410 [inline] do_fault mm/memory.c:5544 [inline] do_pte_missing mm/memory.c:4060 [inline] handle_pte_fault+0x3504/0x57b0 mm/memory.c:5907 __handle_mm_fault mm/memory.c:6050 [inline] handle_mm_fault+0xfa8/0x188c mm/memory.c:6219 do_page_fault+0x574/0x10ac arch/arm64/mm/fault.c:690 do_translation_fault+0xc4/0x114 arch/arm64/mm/fault.c:783 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:919 el0_da+0x60/0x178 arch/arm64/kernel/entry-common.c:604 el0t_64_sync_handler+0xcc/0x108 arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 bcachefs (loop4): /file3 offset 0: read error -2302 from btree lookup