hfsplus: request for non-existent node 16777216 in B*Tree hfsplus: request for non-existent node 16777216 in B*Tree ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.5.318/8894 is trying to acquire lock: ffff0000d1c2a0f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_free+0xc0/0x48c fs/hfsplus/bitmap.c:182 but task is already holding lock: ffff0000f80c22c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x21c/0xa40 fs/hfsplus/extents.c:573 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}: __mutex_lock_common+0x1d0/0x2678 kernel/locking/mutex.c:598 __mutex_lock kernel/locking/mutex.c:760 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812 hfsplus_get_block+0x2d4/0x1244 fs/hfsplus/extents.c:260 block_read_full_folio+0x2ec/0x824 fs/buffer.c:2420 hfsplus_read_folio+0x28/0x38 fs/hfsplus/inode.c:28 filemap_read_folio+0xec/0x2f8 mm/filemap.c:2444 do_read_cache_folio+0x364/0x5bc mm/filemap.c:4036 do_read_cache_page mm/filemap.c:4102 [inline] read_cache_page+0x6c/0x160 mm/filemap.c:4111 read_mapping_page include/linux/pagemap.h:993 [inline] hfsplus_block_allocate+0xe4/0x91c fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0x774/0x1530 fs/hfsplus/extents.c:464 hfsplus_get_block+0x32c/0x1244 fs/hfsplus/extents.c:245 __block_write_begin_int+0x53c/0x15e8 fs/buffer.c:2145 block_write_begin fs/buffer.c:2256 [inline] cont_write_begin+0x62c/0x968 fs/buffer.c:2594 hfsplus_write_begin+0x7c/0xc4 fs/hfsplus/inode.c:48 cont_expand_zero fs/buffer.c:2522 [inline] cont_write_begin+0x26c/0x968 fs/buffer.c:2584 hfsplus_write_begin+0x7c/0xc4 fs/hfsplus/inode.c:48 generic_cont_expand_simple+0x12c/0x1fc fs/buffer.c:2485 hfsplus_setattr+0x140/0x24c fs/hfsplus/inode.c:260 notify_change+0xa0c/0xcb8 fs/attr.c:546 do_truncate+0x198/0x210 fs/open.c:68 do_ftruncate+0x3bc/0x458 fs/open.c:195 do_sys_ftruncate fs/open.c:210 [inline] __do_sys_ftruncate fs/open.c:215 [inline] __se_sys_ftruncate fs/open.c:213 [inline] __arm64_sys_ftruncate+0x90/0xe8 fs/open.c:213 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #0 (&sbi->alloc_mutex){+.+.}-{4:4}: 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 __mutex_lock_common+0x1d0/0x2678 kernel/locking/mutex.c:598 __mutex_lock kernel/locking/mutex.c:760 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812 hfsplus_block_free+0xc0/0x48c fs/hfsplus/bitmap.c:182 hfsplus_free_extents+0x108/0x890 fs/hfsplus/extents.c:360 hfsplus_file_truncate+0x5d8/0xa40 fs/hfsplus/extents.c:588 hfsplus_setattr+0x184/0x24c fs/hfsplus/inode.c:266 notify_change+0xa0c/0xcb8 fs/attr.c:546 do_truncate+0x198/0x210 fs/open.c:68 vfs_truncate+0x398/0x444 fs/open.c:118 do_sys_truncate+0xe4/0x1a8 fs/open.c:141 __do_sys_truncate fs/open.c:153 [inline] __se_sys_truncate fs/open.c:151 [inline] __arm64_sys_truncate+0x5c/0x74 fs/open.c:151 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&HFSPLUS_I(inode)->extents_lock); lock(&sbi->alloc_mutex); lock(&HFSPLUS_I(inode)->extents_lock); lock(&sbi->alloc_mutex); *** DEADLOCK *** 3 locks held by syz.5.318/8894: #0: ffff0000f829c420 (sb_writers#29){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:499 #1: ffff0000f80c24b8 (&sb->s_type->i_mutex_key#32){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:985 [inline] #1: ffff0000f80c24b8 (&sb->s_type->i_mutex_key#32){+.+.}-{4:4}, at: do_truncate+0x164/0x210 fs/open.c:63 #2: ffff0000f80c22c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x21c/0xa40 fs/hfsplus/extents.c:573 stack backtrace: CPU: 1 UID: 0 PID: 8894 Comm: syz.5.318 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 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 __mutex_lock_common+0x1d0/0x2678 kernel/locking/mutex.c:598 __mutex_lock kernel/locking/mutex.c:760 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812 hfsplus_block_free+0xc0/0x48c fs/hfsplus/bitmap.c:182 hfsplus_free_extents+0x108/0x890 fs/hfsplus/extents.c:360 hfsplus_file_truncate+0x5d8/0xa40 fs/hfsplus/extents.c:588 hfsplus_setattr+0x184/0x24c fs/hfsplus/inode.c:266 notify_change+0xa0c/0xcb8 fs/attr.c:546 do_truncate+0x198/0x210 fs/open.c:68 vfs_truncate+0x398/0x444 fs/open.c:118 do_sys_truncate+0xe4/0x1a8 fs/open.c:141 __do_sys_truncate fs/open.c:153 [inline] __se_sys_truncate fs/open.c:151 [inline] __arm64_sys_truncate+0x5c/0x74 fs/open.c:151 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 hfsplus: request for non-existent node 16777216 in B*Tree hfsplus: request for non-existent node 16777216 in B*Tree hfsplus: request for non-existent node 16777216 in B*Tree hfsplus: request for non-existent node 16777216 in B*Tree hfsplus: request for non-existent node 16777216 in B*Tree hfsplus: request for non-existent node 16777216 in B*Tree hfsplus: unable to mark blocks free: error -5 hfsplus: can't free extent: start 134, count 1