============================================ WARNING: possible recursive locking detected 6.16.0-rc1-syzkaller-g39dfc971e42d #0 Not tainted -------------------------------------------- syz-executor/6528 is trying to acquire lock: ffff0000c7181548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x2bc/0x1154 fs/hfsplus/extents.c:260 but task is already holding lock: ffff0000d7d88108 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x20c/0x970 fs/hfsplus/extents.c:577 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&HFSPLUS_I(inode)->extents_lock); lock(&HFSPLUS_I(inode)->extents_lock); *** DEADLOCK *** May be due to missing lock nesting notation 6 locks held by syz-executor/6528: #0: ffff0000dc3f8428 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:557 #1: ffff0000c7181df8 (&type->i_mutex_dir_key#10/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline] #1: ffff0000c7181df8 (&type->i_mutex_dir_key#10/1){+.+.}-{4:4}, at: do_unlinkat+0x190/0x4dc fs/namei.c:4637 #2: ffff0000d7d882f8 (&sb->s_type->i_mutex_key#21){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #2: ffff0000d7d882f8 (&sb->s_type->i_mutex_key#21){+.+.}-{4:4}, at: vfs_unlink+0xd0/0x520 fs/namei.c:4575 #3: ffff0000d58f2998 (&sbi->vh_mutex){+.+.}-{4:4}, at: hfsplus_unlink+0x140/0x63c fs/hfsplus/dir.c:370 #4: ffff0000d7d88108 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x20c/0x970 fs/hfsplus/extents.c:577 #5: ffff0000d58f28f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_free+0xb8/0x3f8 fs/hfsplus/bitmap.c:182 stack backtrace: CPU: 1 UID: 0 PID: 6528 Comm: syz-executor 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_deadlock_bug+0x2e8/0x2f0 kernel/locking/lockdep.c:3044 check_deadlock kernel/locking/lockdep.c:3096 [inline] validate_chain kernel/locking/lockdep.c:3898 [inline] __lock_acquire+0x2940/0x30a4 kernel/locking/lockdep.c:5240 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5871 __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 hfsplus_get_block+0x2bc/0x1154 fs/hfsplus/extents.c:260 block_read_full_folio+0x2ec/0x824 fs/buffer.c:2427 hfsplus_read_folio+0x28/0x38 fs/hfsplus/inode.c:28 filemap_read_folio+0xec/0x2f8 mm/filemap.c:2412 do_read_cache_folio+0x364/0x5bc mm/filemap.c:3894 do_read_cache_page mm/filemap.c:3960 [inline] read_cache_page+0x6c/0x160 mm/filemap.c:3969 read_mapping_page include/linux/pagemap.h:966 [inline] hfsplus_block_free+0x108/0x3f8 fs/hfsplus/bitmap.c:185 hfsplus_free_extents+0x14c/0x8d8 fs/hfsplus/extents.c:363 hfsplus_file_truncate+0x5e0/0x970 fs/hfsplus/extents.c:592 hfsplus_delete_inode+0x164/0x210 fs/hfsplus/inode.c:-1 hfsplus_unlink+0x404/0x63c fs/hfsplus/dir.c:405 vfs_unlink+0x2e0/0x520 fs/namei.c:4586 do_unlinkat+0x2f0/0x4dc fs/namei.c:4650 __do_sys_unlinkat fs/namei.c:4691 [inline] __se_sys_unlinkat fs/namei.c:4684 [inline] __arm64_sys_unlinkat+0xdc/0xf8 fs/namei.c:4684 __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 hfsplus: unable to mark blocks free: error -5 hfsplus: can't free extent hfsplus: unable to mark blocks free: error -5 hfsplus: can't free extent hfsplus: unable to mark blocks free: error -5 hfsplus: can't free extent hfsplus: invalid extended attribute record hfsplus: unable to mark blocks free: error -5 hfsplus: can't free extent hfsplus: unable to mark blocks free: error -5 hfsplus: can't free extent