u64s 7 type extent 536870913:24:U32_MAX len 24 ver 0: durability: 0 crc: c_size 8 size 24 offset 0 nonce 0 csum none 0:0 compress lz4 ptr: 237:893353206280 gen 0 ====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc1-syzkaller-g39dfc971e42d #0 Not tainted ------------------------------------------------------ syz.1.86/7035 is trying to acquire lock: ffff0000fa6601b0 (bcachefs_btree){+.+.}-{0:0}, at: trans_set_locked+0x68/0x200 fs/bcachefs/btree_locking.h:205 but task is already holding lock: ffff0000dfff82e8 (mapping.invalidate_lock#5){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] ffff0000dfff82e8 (mapping.invalidate_lock#5){.+.+}-{4:4}, at: filemap_fault+0x3fc/0x1280 mm/filemap.c:3400 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (mapping.invalidate_lock#5){.+.+}-{4:4}: down_read+0x58/0x2f8 kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] filemap_fault+0x3fc/0x1280 mm/filemap.c:3400 bch2_page_fault+0x2cc/0x700 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0x1fc/0x4cc mm/memory.c:5189 do_read_fault mm/memory.c:5610 [inline] do_fault mm/memory.c:5744 [inline] do_pte_missing mm/memory.c:4251 [inline] handle_pte_fault mm/memory.c:6089 [inline] __handle_mm_fault mm/memory.c:6232 [inline] handle_mm_fault+0x2c94/0x4d38 mm/memory.c:6401 faultin_page mm/gup.c:1186 [inline] __get_user_pages+0x1ddc/0x309c mm/gup.c:1488 populate_vma_page_range+0x218/0x2e8 mm/gup.c:1926 __mm_populate+0x208/0x330 mm/gup.c:2029 mm_populate include/linux/mm.h:3348 [inline] vm_mmap_pgoff+0x378/0x43c mm/util.c:584 ksys_mmap_pgoff+0x394/0x5b8 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+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #4 (&mm->mmap_lock){++++}-{4:4}: __might_fault+0xc4/0x124 mm/memory.c:6991 drm_mode_get_lease_ioctl+0x2bc/0x53c drivers/gpu/drm/drm_lease.c:673 drm_ioctl_kernel+0x238/0x310 drivers/gpu/drm/drm_ioctl.c:796 drm_ioctl+0x65c/0xa5c drivers/gpu/drm/drm_ioctl.c:893 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:893 __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+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #3 (&dev->mode_config.idr_mutex){+.+.}-{4:4}: __mutex_lock_common+0x1d0/0x2190 kernel/locking/mutex.c:602 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799 __drm_mode_object_add+0xa8/0x1f0 drivers/gpu/drm/drm_mode_object.c:47 drm_framebuffer_init+0x14c/0x2bc 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+0xa60/0xda4 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+0xfcc/0x19dc drivers/gpu/drm/drm_framebuffer.c:304 drm_mode_addfb2+0xac/0x2a0 drivers/gpu/drm/drm_framebuffer.c:338 drm_client_buffer_addfb drivers/gpu/drm/drm_client.c:386 [inline] drm_client_framebuffer_create+0x2d0/0x55c drivers/gpu/drm/drm_client.c:428 drm_fbdev_shmem_driver_fbdev_probe+0x180/0x70c 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+0xf94/0x159c drivers/gpu/drm/drm_fb_helper.c:1829 drm_fb_helper_initial_config+0x3c/0x58 drivers/gpu/drm/drm_fb_helper.c:1916 drm_fbdev_client_hotplug+0x154/0x22c drivers/gpu/drm/clients/drm_fbdev_client.c:52 drm_client_register+0x13c/0x1d4 drivers/gpu/drm/drm_client.c:140 drm_fbdev_client_setup+0x194/0x3d0 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:201 [inline] vkms_init+0x498/0x548 drivers/gpu/drm/vkms/vkms_drv.c:221 do_one_initcall+0x250/0x990 init/main.c:1273 do_initcall_level+0x154/0x214 init/main.c:1335 do_initcalls+0x84/0xf4 init/main.c:1351 do_basic_setup+0x8c/0xa0 init/main.c:1370 kernel_init_freeable+0x2dc/0x444 init/main.c:1583 kernel_init+0x24/0x1dc init/main.c:1473 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847 -> #2 (&helper->lock){+.+.}-{4:4}: __mutex_lock_common+0x1d0/0x2190 kernel/locking/mutex.c:602 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799 __drm_fb_helper_restore_fbdev_mode_unlocked+0x74/0x198 drivers/gpu/drm/drm_fb_helper.c:228 drm_fb_helper_set_par+0xa4/0x108 drivers/gpu/drm/drm_fb_helper.c:1359 fbcon_init+0xe58/0x1d0c drivers/video/fbdev/core/fbcon.c:1117 visual_init+0x27c/0x540 drivers/tty/vt/vt.c:1019 do_bind_con_driver+0x7b8/0xdd8 drivers/tty/vt/vt.c:3915 do_take_over_console+0x824/0x97c drivers/tty/vt/vt.c:4481 do_fbcon_takeover+0x158/0x25c drivers/video/fbdev/core/fbcon.c:553 do_fb_registered drivers/video/fbdev/core/fbcon.c:2994 [inline] fbcon_fb_registered+0x354/0x4c8 drivers/video/fbdev/core/fbcon.c:3014 do_register_framebuffer drivers/video/fbdev/core/fbmem.c:509 [inline] register_framebuffer+0x538/0x6c8 drivers/video/fbdev/core/fbmem.c:575 __drm_fb_helper_initial_config_and_unlock+0x103c/0x159c drivers/gpu/drm/drm_fb_helper.c:1851 drm_fb_helper_initial_config+0x3c/0x58 drivers/gpu/drm/drm_fb_helper.c:1916 drm_fbdev_client_hotplug+0x154/0x22c drivers/gpu/drm/clients/drm_fbdev_client.c:52 drm_client_register+0x13c/0x1d4 drivers/gpu/drm/drm_client.c:140 drm_fbdev_client_setup+0x194/0x3d0 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:201 [inline] vkms_init+0x498/0x548 drivers/gpu/drm/vkms/vkms_drv.c:221 do_one_initcall+0x250/0x990 init/main.c:1273 do_initcall_level+0x154/0x214 init/main.c:1335 do_initcalls+0x84/0xf4 init/main.c:1351 do_basic_setup+0x8c/0xa0 init/main.c:1370 kernel_init_freeable+0x2dc/0x444 init/main.c:1583 kernel_init+0x24/0x1dc init/main.c:1473 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847 -> #1 (console_lock){+.+.}-{0:0}: console_lock+0x194/0x1ec kernel/printk/printk.c:2849 bch2_print_string_as_lines+0x68/0x260 fs/bcachefs/util.c:277 __bch2_print_str fs/bcachefs/super.c:117 [inline] bch2_print_str+0x94/0xd0 fs/bcachefs/super.c:122 bch2_dev_missing_bkey+0x124/0x188 fs/bcachefs/sb-members.c:27 bch2_bkey_pick_read_device+0x954/0x133c fs/bcachefs/extents.c:224 __bch2_read_extent+0x6f0/0x3638 fs/bcachefs/io_read.c:1040 bch2_read_extent fs/bcachefs/io_read.h:146 [inline] bchfs_read+0x107c/0x17e8 fs/bcachefs/fs-io-buffered.c:226 bch2_readahead+0xa18/0xd88 fs/bcachefs/fs-io-buffered.c:316 read_pages+0x13c/0x4c4 mm/readahead.c:160 page_cache_ra_order+0x7b8/0xb34 mm/readahead.c:515 do_sync_mmap_readahead+0x2f0/0x660 mm/filemap.c:-1 filemap_fault+0x5e4/0x1280 mm/filemap.c:3412 bch2_page_fault+0x2cc/0x700 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0x1fc/0x4cc mm/memory.c:5189 do_read_fault mm/memory.c:5610 [inline] do_fault mm/memory.c:5744 [inline] do_pte_missing mm/memory.c:4251 [inline] handle_pte_fault mm/memory.c:6089 [inline] __handle_mm_fault mm/memory.c:6232 [inline] handle_mm_fault+0x2c94/0x4d38 mm/memory.c:6401 faultin_page mm/gup.c:1186 [inline] __get_user_pages+0x1ddc/0x309c mm/gup.c:1488 populate_vma_page_range+0x218/0x2e8 mm/gup.c:1926 __mm_populate+0x208/0x330 mm/gup.c:2029 mm_populate include/linux/mm.h:3348 [inline] vm_mmap_pgoff+0x378/0x43c mm/util.c:584 ksys_mmap_pgoff+0x394/0x5b8 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+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #0 (bcachefs_btree){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5240 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5871 trans_set_locked+0x94/0x200 fs/bcachefs/btree_locking.h:206 bch2_trans_begin+0x71c/0xaac fs/bcachefs/btree_iter.c:3338 bch2_read_err_msg_trans+0x64/0x298 fs/bcachefs/io_read.c:369 __bch2_read_extent+0x25f0/0x3638 fs/bcachefs/io_read.c:1058 bch2_read_extent fs/bcachefs/io_read.h:146 [inline] bchfs_read+0x107c/0x17e8 fs/bcachefs/fs-io-buffered.c:226 bch2_read_single_folio+0x498/0x6e4 fs/bcachefs/fs-io-buffered.c:360 bch2_read_folio+0x40/0x84 fs/bcachefs/fs-io-buffered.c:378 filemap_read_folio+0xec/0x2f8 mm/filemap.c:2412 filemap_fault+0xd48/0x1280 mm/filemap.c:3504 bch2_page_fault+0x2cc/0x700 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0x1fc/0x4cc mm/memory.c:5189 do_read_fault mm/memory.c:5610 [inline] do_fault mm/memory.c:5744 [inline] do_pte_missing mm/memory.c:4251 [inline] handle_pte_fault mm/memory.c:6089 [inline] __handle_mm_fault mm/memory.c:6232 [inline] handle_mm_fault+0x2c94/0x4d38 mm/memory.c:6401 faultin_page mm/gup.c:1186 [inline] __get_user_pages+0x1ddc/0x309c mm/gup.c:1488 populate_vma_page_range+0x218/0x2e8 mm/gup.c:1926 __mm_populate+0x208/0x330 mm/gup.c:2029 mm_populate include/linux/mm.h:3348 [inline] vm_mmap_pgoff+0x378/0x43c mm/util.c:584 ksys_mmap_pgoff+0x394/0x5b8 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+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 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#5 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(mapping.invalidate_lock#5); lock(&mm->mmap_lock); lock(mapping.invalidate_lock#5); lock(bcachefs_btree); *** DEADLOCK *** 1 lock held by syz.1.86/7035: #0: ffff0000dfff82e8 (mapping.invalidate_lock#5){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] #0: ffff0000dfff82e8 (mapping.invalidate_lock#5){.+.+}-{4:4}, at: filemap_fault+0x3fc/0x1280 mm/filemap.c:3400 stack backtrace: CPU: 0 UID: 0 PID: 7035 Comm: syz.1.86 Not tainted 6.16.0-rc1-syzkaller-g39dfc971e42d #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x324/0x32c kernel/locking/lockdep.c:2046 check_noncircular+0x154/0x174 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5240 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5871 trans_set_locked+0x94/0x200 fs/bcachefs/btree_locking.h:206 bch2_trans_begin+0x71c/0xaac fs/bcachefs/btree_iter.c:3338 bch2_read_err_msg_trans+0x64/0x298 fs/bcachefs/io_read.c:369 __bch2_read_extent+0x25f0/0x3638 fs/bcachefs/io_read.c:1058 bch2_read_extent fs/bcachefs/io_read.h:146 [inline] bchfs_read+0x107c/0x17e8 fs/bcachefs/fs-io-buffered.c:226 bch2_read_single_folio+0x498/0x6e4 fs/bcachefs/fs-io-buffered.c:360 bch2_read_folio+0x40/0x84 fs/bcachefs/fs-io-buffered.c:378 filemap_read_folio+0xec/0x2f8 mm/filemap.c:2412 filemap_fault+0xd48/0x1280 mm/filemap.c:3504 bch2_page_fault+0x2cc/0x700 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0x1fc/0x4cc mm/memory.c:5189 do_read_fault mm/memory.c:5610 [inline] do_fault mm/memory.c:5744 [inline] do_pte_missing mm/memory.c:4251 [inline] handle_pte_fault mm/memory.c:6089 [inline] __handle_mm_fault mm/memory.c:6232 [inline] handle_mm_fault+0x2c94/0x4d38 mm/memory.c:6401 faultin_page mm/gup.c:1186 [inline] __get_user_pages+0x1ddc/0x309c mm/gup.c:1488 populate_vma_page_range+0x218/0x2e8 mm/gup.c:1926 __mm_populate+0x208/0x330 mm/gup.c:2029 mm_populate include/linux/mm.h:3348 [inline] vm_mmap_pgoff+0x378/0x43c mm/util.c:584 ksys_mmap_pgoff+0x394/0x5b8 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+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600