====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc1-syzkaller-g39dfc971e42d #0 Not tainted ------------------------------------------------------ syz.0.383/7689 is trying to acquire lock: ffff0000f7ae41b0 (bcachefs_btree){+.+.}-{0:0}, at: trans_set_locked+0x68/0x200 fs/bcachefs/btree_locking.h:205 but task is already holding lock: ffff0000f91602e8 (mapping.invalidate_lock#8){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] ffff0000f91602e8 (mapping.invalidate_lock#8){.+.+}-{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: -> #3 (mapping.invalidate_lock#8){.+.+}-{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 -> #2 (&mm->mmap_lock){++++}-{4:4}: __might_fault+0xc4/0x124 mm/memory.c:6991 _inline_copy_to_user include/linux/uaccess.h:192 [inline] copy_to_user include/linux/uaccess.h:223 [inline] copy_to_user_errcode fs/bcachefs/util.h:701 [inline] bch2_ioctl_read_super fs/bcachefs/chardev.c:596 [inline] bch2_fs_ioctl+0xe34/0x29c4 fs/bcachefs/chardev.c:703 bch2_fs_file_ioctl+0x4dc/0x1964 fs/bcachefs/fs-ioctl.c:411 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 -> #1 (&c->sb_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 class_mutex_constructor include/linux/mutex.h:225 [inline] bch2_run_explicit_recovery_pass+0x48/0xc8 fs/bcachefs/recovery_passes.c:407 bch2_dev_missing_bkey+0x104/0x188 fs/bcachefs/sb-members.c:23 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#8 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(mapping.invalidate_lock#8); lock(&mm->mmap_lock); lock(mapping.invalidate_lock#8); lock(bcachefs_btree); *** DEADLOCK *** 1 lock held by syz.0.383/7689: #0: ffff0000f91602e8 (mapping.invalidate_lock#8){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] #0: ffff0000f91602e8 (mapping.invalidate_lock#8){.+.+}-{4:4}, at: filemap_fault+0x3fc/0x1280 mm/filemap.c:3400 stack backtrace: CPU: 0 UID: 0 PID: 7689 Comm: syz.0.383 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