bcachefs (loop3): btree_path_down(): fatal error node not found at pos 536870912:1:U32_MAX within parent node u64s 5 type btree_ptr SPOS_MAX len 0 ver 0 ====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc2-syzkaller-gc72692105976 #0 Not tainted ------------------------------------------------------ syz.3.244/8080 is trying to acquire lock: ffff0000fe3a4140 (bcachefs_btree){+.+.}-{0:0}, at: trans_set_locked+0x5c/0x1a4 fs/bcachefs/btree_locking.h:197 but task is already holding lock: ffff0000f15d1218 (mapping.invalidate_lock#7){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline] ffff0000f15d1218 (mapping.invalidate_lock#7){.+.+}-{4:4}, at: filemap_update_page mm/filemap.c:2450 [inline] ffff0000f15d1218 (mapping.invalidate_lock#7){.+.+}-{4:4}, at: filemap_get_pages+0x73c/0x1cdc mm/filemap.c:2612 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #7 (mapping.invalidate_lock#7){.+.+}-{4:4}: down_read+0x58/0x2fc kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:922 [inline] filemap_fault+0x5f4/0x1364 mm/filemap.c:3390 bch2_page_fault+0x34c/0x808 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0xf8/0x498 mm/memory.c:5098 do_read_fault mm/memory.c:5518 [inline] do_fault mm/memory.c:5652 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault+0x2e90/0x5c94 mm/memory.c:5997 __handle_mm_fault mm/memory.c:6140 [inline] handle_mm_fault+0xf18/0x17bc mm/memory.c:6309 faultin_page mm/gup.c:1193 [inline] __get_user_pages+0x187c/0x3408 mm/gup.c:1491 populate_vma_page_range+0x220/0x2f0 mm/gup.c:1929 __mm_populate+0x240/0x3d8 mm/gup.c:2032 mm_populate include/linux/mm.h:3470 [inline] vm_mmap_pgoff+0x3e8/0x4ac mm/util.c:584 ksys_mmap_pgoff+0x3a4/0x5c8 mm/mmap.c:607 __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: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 -> #6 (&mm->mmap_lock){++++}-{4:4}: __might_fault+0xc4/0x124 mm/memory.c:7151 drm_mode_object_get_properties+0x208/0x540 drivers/gpu/drm/drm_mode_object.c:407 drm_mode_obj_get_properties_ioctl+0x2bc/0x4fc drivers/gpu/drm/drm_mode_object.c:459 drm_ioctl_kernel+0x26c/0x368 drivers/gpu/drm/drm_ioctl.c:796 drm_ioctl+0x69c/0xbb8 drivers/gpu/drm/drm_ioctl.c:893 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/0x1c4 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 -> #5 (crtc_ww_class_mutex){+.+.}-{4:4}: ww_acquire_init include/linux/ww_mutex.h:162 [inline] drm_modeset_acquire_init+0x1e4/0x384 drivers/gpu/drm/drm_modeset_lock.c:250 drmm_mode_config_init+0xb98/0x130c drivers/gpu/drm/drm_mode_config.c:462 vkms_modeset_init drivers/gpu/drm/vkms/vkms_drv.c:146 [inline] vkms_create drivers/gpu/drm/vkms/vkms_drv.c:207 [inline] vkms_init+0x2f0/0x5f8 drivers/gpu/drm/vkms/vkms_drv.c:242 do_one_initcall+0x254/0xaa4 init/main.c:1257 do_initcall_level+0x154/0x214 init/main.c:1319 do_initcalls+0x84/0xf4 init/main.c:1335 do_basic_setup+0x8c/0xa0 init/main.c:1354 kernel_init_freeable+0x320/0x474 init/main.c:1567 kernel_init+0x24/0x2a0 init/main.c:1457 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 -> #4 (crtc_ww_class_acquire){+.+.}-{0:0}: ww_acquire_init include/linux/ww_mutex.h:161 [inline] drm_modeset_acquire_init+0x1c4/0x384 drivers/gpu/drm/drm_modeset_lock.c:250 drm_client_modeset_commit_atomic+0xd8/0x724 drivers/gpu/drm/drm_client_modeset.c:1018 drm_client_modeset_commit_locked+0xd0/0x4a8 drivers/gpu/drm/drm_client_modeset.c:1182 drm_client_modeset_commit+0x50/0x7c drivers/gpu/drm/drm_client_modeset.c:1208 __drm_fb_helper_restore_fbdev_mode_unlocked+0xd4/0x1c8 drivers/gpu/drm/drm_fb_helper.c:237 drm_fb_helper_set_par+0xc4/0x110 drivers/gpu/drm/drm_fb_helper.c:1359 fbcon_init+0xf34/0x1eb8 drivers/video/fbdev/core/fbcon.c:1112 visual_init+0x27c/0x548 drivers/tty/vt/vt.c:1011 do_bind_con_driver+0x7dc/0xe04 drivers/tty/vt/vt.c:3831 do_take_over_console+0x4ac/0x5f0 drivers/tty/vt/vt.c:4397 do_fbcon_takeover+0x158/0x260 drivers/video/fbdev/core/fbcon.c:548 do_fb_registered drivers/video/fbdev/core/fbcon.c:2989 [inline] fbcon_fb_registered+0x370/0x4ec drivers/video/fbdev/core/fbcon.c:3009 do_register_framebuffer drivers/video/fbdev/core/fbmem.c:449 [inline] register_framebuffer+0x470/0x610 drivers/video/fbdev/core/fbmem.c:515 __drm_fb_helper_initial_config_and_unlock+0x12c8/0x1908 drivers/gpu/drm/drm_fb_helper.c:1851 drm_fb_helper_initial_config+0x48/0x64 drivers/gpu/drm/drm_fb_helper.c:1916 drm_fbdev_client_hotplug+0x158/0x22c drivers/gpu/drm/clients/drm_fbdev_client.c:52 drm_client_register+0x144/0x1e0 drivers/gpu/drm/drm_client.c:140 drm_fbdev_client_setup+0x1a4/0x3dc drivers/gpu/drm/clients/drm_fbdev_client.c:159 drm_client_setup+0x78/0x140 drivers/gpu/drm/clients/drm_client_setup.c:39 vkms_create drivers/gpu/drm/vkms/vkms_drv.c:218 [inline] vkms_init+0x4ec/0x5f8 drivers/gpu/drm/vkms/vkms_drv.c:242 do_one_initcall+0x254/0xaa4 init/main.c:1257 do_initcall_level+0x154/0x214 init/main.c:1319 do_initcalls+0x84/0xf4 init/main.c:1335 do_basic_setup+0x8c/0xa0 init/main.c:1354 kernel_init_freeable+0x320/0x474 init/main.c:1567 kernel_init+0x24/0x2a0 init/main.c:1457 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 -> #3 (&client->modeset_mutex){+.+.}-{4:4}: __mutex_lock_common+0x1f0/0x2604 kernel/locking/mutex.c:601 __mutex_lock kernel/locking/mutex.c:746 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:798 drm_client_modeset_probe+0x300/0x3d18 drivers/gpu/drm/drm_client_modeset.c:843 __drm_fb_helper_initial_config_and_unlock+0xf8/0x1908 drivers/gpu/drm/drm_fb_helper.c:1828 drm_fb_helper_initial_config+0x48/0x64 drivers/gpu/drm/drm_fb_helper.c:1916 drm_fbdev_client_hotplug+0x158/0x22c drivers/gpu/drm/clients/drm_fbdev_client.c:52 drm_client_register+0x144/0x1e0 drivers/gpu/drm/drm_client.c:140 drm_fbdev_client_setup+0x1a4/0x3dc drivers/gpu/drm/clients/drm_fbdev_client.c:159 drm_client_setup+0x78/0x140 drivers/gpu/drm/clients/drm_client_setup.c:39 vkms_create drivers/gpu/drm/vkms/vkms_drv.c:218 [inline] vkms_init+0x4ec/0x5f8 drivers/gpu/drm/vkms/vkms_drv.c:242 do_one_initcall+0x254/0xaa4 init/main.c:1257 do_initcall_level+0x154/0x214 init/main.c:1319 do_initcalls+0x84/0xf4 init/main.c:1335 do_basic_setup+0x8c/0xa0 init/main.c:1354 kernel_init_freeable+0x320/0x474 init/main.c:1567 kernel_init+0x24/0x2a0 init/main.c:1457 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 -> #2 (&helper->lock){+.+.}-{4:4}: __mutex_lock_common+0x1f0/0x2604 kernel/locking/mutex.c:601 __mutex_lock kernel/locking/mutex.c:746 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:798 __drm_fb_helper_restore_fbdev_mode_unlocked+0xb4/0x1c8 drivers/gpu/drm/drm_fb_helper.c:228 drm_fb_helper_set_par+0xc4/0x110 drivers/gpu/drm/drm_fb_helper.c:1359 fbcon_init+0xf34/0x1eb8 drivers/video/fbdev/core/fbcon.c:1112 visual_init+0x27c/0x548 drivers/tty/vt/vt.c:1011 do_bind_con_driver+0x7dc/0xe04 drivers/tty/vt/vt.c:3831 do_take_over_console+0x4ac/0x5f0 drivers/tty/vt/vt.c:4397 do_fbcon_takeover+0x158/0x260 drivers/video/fbdev/core/fbcon.c:548 do_fb_registered drivers/video/fbdev/core/fbcon.c:2989 [inline] fbcon_fb_registered+0x370/0x4ec drivers/video/fbdev/core/fbcon.c:3009 do_register_framebuffer drivers/video/fbdev/core/fbmem.c:449 [inline] register_framebuffer+0x470/0x610 drivers/video/fbdev/core/fbmem.c:515 __drm_fb_helper_initial_config_and_unlock+0x12c8/0x1908 drivers/gpu/drm/drm_fb_helper.c:1851 drm_fb_helper_initial_config+0x48/0x64 drivers/gpu/drm/drm_fb_helper.c:1916 drm_fbdev_client_hotplug+0x158/0x22c drivers/gpu/drm/clients/drm_fbdev_client.c:52 drm_client_register+0x144/0x1e0 drivers/gpu/drm/drm_client.c:140 drm_fbdev_client_setup+0x1a4/0x3dc drivers/gpu/drm/clients/drm_fbdev_client.c:159 drm_client_setup+0x78/0x140 drivers/gpu/drm/clients/drm_client_setup.c:39 vkms_create drivers/gpu/drm/vkms/vkms_drv.c:218 [inline] vkms_init+0x4ec/0x5f8 drivers/gpu/drm/vkms/vkms_drv.c:242 do_one_initcall+0x254/0xaa4 init/main.c:1257 do_initcall_level+0x154/0x214 init/main.c:1319 do_initcalls+0x84/0xf4 init/main.c:1335 do_basic_setup+0x8c/0xa0 init/main.c:1354 kernel_init_freeable+0x320/0x474 init/main.c:1567 kernel_init+0x24/0x2a0 init/main.c:1457 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 -> #1 (console_lock){+.+.}-{0:0}: console_lock+0x19c/0x1f4 kernel/printk/printk.c:2849 __bch2_print_string_as_lines fs/bcachefs/util.c:267 [inline] bch2_print_string_as_lines+0x34/0x150 fs/bcachefs/util.c:286 bucket_ref_update_err+0x234/0x340 fs/bcachefs/buckets.c:416 bch2_bucket_ref_update+0x804/0x89c fs/bcachefs/buckets.c:-1 __mark_pointer fs/bcachefs/buckets.c:571 [inline] bch2_trigger_pointer fs/bcachefs/buckets.c:610 [inline] __trigger_extent+0x1204/0x4ae8 fs/bcachefs/buckets.c:755 bch2_trigger_extent+0x478/0x854 fs/bcachefs/buckets.c:873 bch2_key_trigger fs/bcachefs/bkey_methods.h:88 [inline] run_one_trans_trigger fs/bcachefs/btree_trans_commit.c:508 [inline] bch2_trans_commit_run_triggers fs/bcachefs/btree_trans_commit.c:550 [inline] __bch2_trans_commit+0x900/0x6910 fs/bcachefs/btree_trans_commit.c:990 bch2_trans_commit fs/bcachefs/btree_update.h:195 [inline] bch2_extent_update+0x3e8/0x96c fs/bcachefs/io_write.c:332 bch2_write_index_default fs/bcachefs/io_write.c:380 [inline] __bch2_write_index+0x6bc/0x12a0 fs/bcachefs/io_write.c:570 bch2_write_data_inline fs/bcachefs/io_write.c:1609 [inline] bch2_write+0xd28/0x154c fs/bcachefs/io_write.c:1677 closure_queue include/linux/closure.h:270 [inline] closure_call include/linux/closure.h:432 [inline] bch2_writepage_do_io fs/bcachefs/fs-io-buffered.c:494 [inline] bch2_writepages+0x22c/0x310 fs/bcachefs/fs-io-buffered.c:677 do_writepages+0x2f8/0x7c4 mm/page-writeback.c:2656 filemap_fdatawrite_wbc mm/filemap.c:386 [inline] __filemap_fdatawrite_range mm/filemap.c:419 [inline] filemap_write_and_wait_range+0x200/0x314 mm/filemap.c:691 bchfs_truncate+0x5f4/0xa64 fs/bcachefs/fs-io.c:-1 bch2_setattr+0x1a0/0x214 fs/bcachefs/fs.c:1218 notify_change+0x9f0/0xca0 fs/attr.c:552 do_truncate+0x1c0/0x28c fs/open.c:65 vfs_truncate+0x3ec/0x450 fs/open.c:115 do_sys_truncate+0xe8/0x1ac fs/open.c:138 __do_sys_truncate fs/open.c:150 [inline] __se_sys_truncate fs/open.c:148 [inline] __arm64_sys_truncate+0x5c/0x74 fs/open.c:148 __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:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x17b8/0x32c4 kernel/locking/lockdep.c:5235 lock_acquire+0x150/0x2e8 kernel/locking/lockdep.c:5866 trans_set_locked+0x88/0x1a4 fs/bcachefs/btree_locking.h:198 bch2_trans_begin+0x6fc/0x980 fs/bcachefs/btree_iter.c:3279 bchfs_read+0x1b54/0x1f48 fs/bcachefs/fs-io-buffered.c:258 bch2_read_single_folio+0x4bc/0x708 fs/bcachefs/fs-io-buffered.c:360 bch2_read_folio+0x40/0x88 fs/bcachefs/fs-io-buffered.c:378 filemap_read_folio+0x108/0x318 mm/filemap.c:2400 filemap_update_page mm/filemap.c:2484 [inline] filemap_get_pages+0x1340/0x1cdc mm/filemap.c:2612 filemap_read+0x360/0xe94 mm/filemap.c:2701 bch2_read_iter+0x260/0x112c fs/bcachefs/fs-io-direct.c:221 new_sync_read fs/read_write.c:489 [inline] vfs_read+0x698/0x974 fs/read_write.c:570 ksys_read+0x15c/0x26c fs/read_write.c:713 __do_sys_read fs/read_write.c:722 [inline] __se_sys_read fs/read_write.c:720 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:720 __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 other info that might help us debug this: Chain exists of: bcachefs_btree --> &mm->mmap_lock --> mapping.invalidate_lock#7 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(mapping.invalidate_lock#7); lock(&mm->mmap_lock); lock(mapping.invalidate_lock#7); lock(bcachefs_btree); *** DEADLOCK *** 2 locks held by syz.3.244/8080: #0: ffff0000cb3470b8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x20c/0x2a0 fs/file.c:1213 #1: ffff0000f15d1218 (mapping.invalidate_lock#7){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline] #1: ffff0000f15d1218 (mapping.invalidate_lock#7){.+.+}-{4:4}, at: filemap_update_page mm/filemap.c:2450 [inline] #1: ffff0000f15d1218 (mapping.invalidate_lock#7){.+.+}-{4:4}, at: filemap_get_pages+0x73c/0x1cdc mm/filemap.c:2612 stack backtrace: CPU: 1 UID: 0 PID: 8080 Comm: syz.3.244 Not tainted 6.15.0-rc2-syzkaller-gc72692105976 #0 PREEMPT 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/0x1028 lib/dump_stack.c:129 print_circular_bug+0x32c/0x334 kernel/locking/lockdep.c:2079 check_noncircular+0x15c/0x178 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x17b8/0x32c4 kernel/locking/lockdep.c:5235 lock_acquire+0x150/0x2e8 kernel/locking/lockdep.c:5866 trans_set_locked+0x88/0x1a4 fs/bcachefs/btree_locking.h:198 bch2_trans_begin+0x6fc/0x980 fs/bcachefs/btree_iter.c:3279 bchfs_read+0x1b54/0x1f48 fs/bcachefs/fs-io-buffered.c:258 bch2_read_single_folio+0x4bc/0x708 fs/bcachefs/fs-io-buffered.c:360 bch2_read_folio+0x40/0x88 fs/bcachefs/fs-io-buffered.c:378 filemap_read_folio+0x108/0x318 mm/filemap.c:2400 filemap_update_page mm/filemap.c:2484 [inline] filemap_get_pages+0x1340/0x1cdc mm/filemap.c:2612 filemap_read+0x360/0xe94 mm/filemap.c:2701 bch2_read_iter+0x260/0x112c fs/bcachefs/fs-io-direct.c:221 new_sync_read fs/read_write.c:489 [inline] vfs_read+0x698/0x974 fs/read_write.c:570 ksys_read+0x15c/0x26c fs/read_write.c:713 __do_sys_read fs/read_write.c:722 [inline] __se_sys_read fs/read_write.c:720 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:720 __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