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 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 Not tainted ------------------------------------------------------ syz.2.330/8664 is trying to acquire lock: ffff000102c481b0 (bcachefs_btree){+.+.}-{0:0}, at: trans_set_locked+0x68/0x200 fs/bcachefs/btree_locking.h:205 but task is already holding lock: ffff0000f6b182e8 (mapping.invalidate_lock#7){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] ffff0000f6b182e8 (mapping.invalidate_lock#7){.+.+}-{4:4}, at: filemap_fault+0x3fc/0x1280 mm/filemap.c:3433 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (mapping.invalidate_lock#7){.+.+}-{4:4}: down_read+0x58/0x2f8 kernel/locking/rwsem.c:1537 filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] filemap_fault+0x3fc/0x1280 mm/filemap.c:3433 bch2_page_fault+0x2cc/0x700 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0x1fc/0x4cc mm/memory.c:5152 do_read_fault mm/memory.c:5573 [inline] do_fault mm/memory.c:5707 [inline] do_pte_missing mm/memory.c:4234 [inline] handle_pte_fault mm/memory.c:6052 [inline] __handle_mm_fault mm/memory.c:6195 [inline] handle_mm_fault+0x2c90/0x4d34 mm/memory.c:6364 do_page_fault+0x57c/0x13cc arch/arm64/mm/fault.c:696 do_translation_fault+0xc4/0x114 arch/arm64/mm/fault.c:789 do_mem_abort+0x70/0x194 arch/arm64/mm/fault.c:929 el0_da+0x64/0x164 arch/arm64/kernel/entry-common.c:697 el0t_64_sync_handler+0x90/0x12c arch/arm64/kernel/entry-common.c:901 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #2 (&mm->mmap_lock){++++}-{4:4}: __might_fault+0xc4/0x124 mm/memory.c:6958 _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:611 [inline] bch2_fs_ioctl+0xb3c/0x13e0 fs/bcachefs/chardev.c:718 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:598 [inline] __se_sys_ioctl fs/ioctl.c:584 [inline] __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:584 __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+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #1 (&c->sb_lock){+.+.}-{4:4}: __mutex_lock_common+0x1d0/0x24ac kernel/locking/mutex.c:598 __mutex_lock kernel/locking/mutex.c:760 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812 __bch2_trans_mark_dev_sb fs/bcachefs/buckets.c:1129 [inline] bch2_trans_mark_dev_sb+0xd8/0x67c fs/bcachefs/buckets.c:1176 bch2_trans_mark_dev_sbs_flags+0x414/0x47c fs/bcachefs/buckets.c:1186 bch2_mark_superblocks fs/bcachefs/btree_gc.c:805 [inline] bch2_check_allocations+0x52c/0x3c34 fs/bcachefs/btree_gc.c:1089 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:484 [inline] __bch2_run_recovery_passes+0x2b8/0xd54 fs/bcachefs/recovery_passes.c:539 bch2_run_recovery_passes+0x174/0x1f4 fs/bcachefs/recovery_passes.c:610 bch2_fs_recovery+0x1c34/0x2fb4 fs/bcachefs/recovery.c:1016 bch2_fs_start+0x940/0xbec fs/bcachefs/super.c:1213 bch2_fs_get_tree+0x880/0x107c fs/bcachefs/fs.c:2488 vfs_get_tree+0x90/0x28c fs/super.c:1815 do_new_mount+0x278/0x7f4 fs/namespace.c:3805 path_mount+0x5b4/0xde0 fs/namespace.c:4120 do_mount fs/namespace.c:4133 [inline] __do_sys_mount fs/namespace.c:4344 [inline] __se_sys_mount fs/namespace.c:4321 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4321 __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+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #0 (bcachefs_btree){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868 trans_set_locked+0x94/0x200 fs/bcachefs/btree_locking.h:206 bch2_trans_begin+0x800/0xd30 fs/bcachefs/btree_iter.c:3403 bch2_read_err_msg_trans+0x64/0x298 fs/bcachefs/io_read.c:374 __bch2_read_extent+0x25f0/0x3638 fs/bcachefs/io_read.c:1070 bch2_read_extent fs/bcachefs/io_read.h:147 [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:2413 filemap_fault+0xd48/0x1280 mm/filemap.c:3537 bch2_page_fault+0x2cc/0x700 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0x1fc/0x4cc mm/memory.c:5152 do_read_fault mm/memory.c:5573 [inline] do_fault mm/memory.c:5707 [inline] do_pte_missing mm/memory.c:4234 [inline] handle_pte_fault mm/memory.c:6052 [inline] __handle_mm_fault mm/memory.c:6195 [inline] handle_mm_fault+0x2c90/0x4d34 mm/memory.c:6364 do_page_fault+0x8a0/0x13cc arch/arm64/mm/fault.c:696 do_translation_fault+0xc4/0x114 arch/arm64/mm/fault.c:789 do_mem_abort+0x70/0x194 arch/arm64/mm/fault.c:929 el0_da+0x64/0x164 arch/arm64/kernel/entry-common.c:697 el0t_64_sync_handler+0x90/0x12c arch/arm64/kernel/entry-common.c:901 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 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.2.330/8664: #0: ffff0000c2c65e50 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:472 [inline] #0: ffff0000c2c65e50 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:277 [inline] #0: ffff0000c2c65e50 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x38/0x2d8 mm/mmap_lock.c:337 #1: ffff0000f6b182e8 (mapping.invalidate_lock#7){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:934 [inline] #1: ffff0000f6b182e8 (mapping.invalidate_lock#7){.+.+}-{4:4}, at: filemap_fault+0x3fc/0x1280 mm/filemap.c:3433 stack backtrace: CPU: 0 UID: 0 PID: 8664 Comm: syz.2.330 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (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:2043 check_noncircular+0x154/0x174 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868 trans_set_locked+0x94/0x200 fs/bcachefs/btree_locking.h:206 bch2_trans_begin+0x800/0xd30 fs/bcachefs/btree_iter.c:3403 bch2_read_err_msg_trans+0x64/0x298 fs/bcachefs/io_read.c:374 __bch2_read_extent+0x25f0/0x3638 fs/bcachefs/io_read.c:1070 bch2_read_extent fs/bcachefs/io_read.h:147 [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:2413 filemap_fault+0xd48/0x1280 mm/filemap.c:3537 bch2_page_fault+0x2cc/0x700 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0x1fc/0x4cc mm/memory.c:5152 do_read_fault mm/memory.c:5573 [inline] do_fault mm/memory.c:5707 [inline] do_pte_missing mm/memory.c:4234 [inline] handle_pte_fault mm/memory.c:6052 [inline] __handle_mm_fault mm/memory.c:6195 [inline] handle_mm_fault+0x2c90/0x4d34 mm/memory.c:6364 do_page_fault+0x8a0/0x13cc arch/arm64/mm/fault.c:696 do_translation_fault+0xc4/0x114 arch/arm64/mm/fault.c:789 do_mem_abort+0x70/0x194 arch/arm64/mm/fault.c:929 el0_da+0x64/0x164 arch/arm64/kernel/entry-common.c:697 el0t_64_sync_handler+0x90/0x12c arch/arm64/kernel/entry-common.c:901 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 bcachefs (loop2): /file3 offset 0: no_devices_valid 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 bcachefs (loop2): /file3 offset 0: no_devices_valid 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 bcachefs (loop2): /file3 offset 0: no_devices_valid 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 bcachefs (loop2): /file3 offset 0: no_devices_valid 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 bcachefs (loop2): /file3 offset 0: no_devices_valid 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