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 6.15.0-rc2-syzkaller-gc72692105976 #0 Not tainted ------------------------------------------------------ syz.4.469/9011 is trying to acquire lock: ffff0000c9734140 (bcachefs_btree){+.+.}-{0:0}, at: trans_set_locked+0x5c/0x1a4 fs/bcachefs/btree_locking.h:197 but task is already holding lock: ffff0000ddbc9218 (mapping.invalidate_lock#6){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline] ffff0000ddbc9218 (mapping.invalidate_lock#6){.+.+}-{4:4}, at: filemap_update_page mm/filemap.c:2450 [inline] ffff0000ddbc9218 (mapping.invalidate_lock#6){.+.+}-{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: -> #5 (mapping.invalidate_lock#6){.+.+}-{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 do_page_fault+0x580/0x11c8 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 -> #4 (&mm->mmap_lock){++++}-{4:4}: __might_fault+0xc4/0x124 mm/memory.c:7151 drm_mode_get_lease_ioctl+0x318/0x63c drivers/gpu/drm/drm_lease.c:673 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 -> #3 (&dev->mode_config.idr_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_mode_object_add+0xb8/0x204 drivers/gpu/drm/drm_mode_object.c:47 drm_framebuffer_init+0x158/0x2d4 drivers/gpu/drm/drm_framebuffer.c:875 drm_gem_fb_init drivers/gpu/drm/drm_gem_framebuffer_helper.c:82 [inline] drm_gem_fb_init_with_funcs+0x9bc/0xd64 drivers/gpu/drm/drm_gem_framebuffer_helper.c:202 drm_gem_fb_create_with_funcs drivers/gpu/drm/drm_gem_framebuffer_helper.c:245 [inline] drm_gem_fb_create+0x84/0xd4 drivers/gpu/drm/drm_gem_framebuffer_helper.c:286 drm_internal_framebuffer_create+0x100c/0x1408 drivers/gpu/drm/drm_framebuffer.c:304 drm_mode_addfb2+0xb4/0x2a8 drivers/gpu/drm/drm_framebuffer.c:338 drm_client_buffer_addfb drivers/gpu/drm/drm_client.c:386 [inline] drm_client_framebuffer_create+0x388/0x748 drivers/gpu/drm/drm_client.c:428 drm_fbdev_shmem_driver_fbdev_probe+0x1a8/0x764 drivers/gpu/drm/drm_fbdev_shmem.c:151 drm_fb_helper_single_fb_probe drivers/gpu/drm/drm_fb_helper.c:1649 [inline] __drm_fb_helper_initial_config_and_unlock+0x1228/0x1908 drivers/gpu/drm/drm_fb_helper.c:1829 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 __btree_err+0x410/0x63c fs/bcachefs/btree_io.c:607 validate_bset+0x13cc/0x2034 fs/bcachefs/btree_io.c:817 bch2_btree_node_read_done+0x1764/0x4b60 fs/bcachefs/btree_io.c:1158 btree_node_read_work+0x51c/0xfe0 fs/bcachefs/btree_io.c:1366 bch2_btree_node_read+0x1da0/0x2480 fs/bcachefs/btree_io.c:1756 bch2_btree_node_fill+0x850/0xf4c fs/bcachefs/btree_cache.c:995 bch2_btree_node_get_noiter+0x7fc/0xbec fs/bcachefs/btree_cache.c:1262 found_btree_node_is_readable fs/bcachefs/btree_node_scan.c:85 [inline] try_read_btree_node fs/bcachefs/btree_node_scan.c:220 [inline] read_btree_nodes_worker+0xf38/0x19e0 fs/bcachefs/btree_node_scan.c:269 kthread+0x674/0x7dc kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 -> #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#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.4.469/9011: #0: ffff0000d67af5f8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x20c/0x2a0 fs/file.c:1213 #1: ffff0000ddbc9218 (mapping.invalidate_lock#6){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline] #1: ffff0000ddbc9218 (mapping.invalidate_lock#6){.+.+}-{4:4}, at: filemap_update_page mm/filemap.c:2450 [inline] #1: ffff0000ddbc9218 (mapping.invalidate_lock#6){.+.+}-{4:4}, at: filemap_get_pages+0x73c/0x1cdc mm/filemap.c:2612 stack backtrace: CPU: 1 UID: 0 PID: 9011 Comm: syz.4.469 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 bcachefs (loop4): /file3 offset 0: read error -2324 from btree lookup