============================================ WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- syz-executor/6566 is trying to acquire lock: ffff0000d3a9b708 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x2d4/0x1268 fs/hfsplus/extents.c:260 but task is already holding lock: ffff0000d3a9d208 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x21c/0xa58 fs/hfsplus/extents.c:573 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/6566: #0: ffff0000dc0e6420 (sb_writers#27){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:499 #1: ffff0000d3a9bfb8 (&type->i_mutex_dir_key#24/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1072 [inline] #1: ffff0000d3a9bfb8 (&type->i_mutex_dir_key#24/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2864 [inline] #1: ffff0000d3a9bfb8 (&type->i_mutex_dir_key#24/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2875 [inline] #1: ffff0000d3a9bfb8 (&type->i_mutex_dir_key#24/1){+.+.}-{4:4}, at: do_unlinkat+0x188/0x48c fs/namei.c:5420 #2: ffff0000d3a9d3f8 (&sb->s_type->i_mutex_key#38){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1027 [inline] #2: ffff0000d3a9d3f8 (&sb->s_type->i_mutex_key#38){+.+.}-{4:4}, at: vfs_unlink+0xd0/0x544 fs/namei.c:5355 #3: ffff0000df4cd198 (&sbi->vh_mutex){+.+.}-{4:4}, at: hfsplus_unlink+0x140/0x63c fs/hfsplus/dir.c:370 #4: ffff0000d3a9d208 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x21c/0xa58 fs/hfsplus/extents.c:573 #5: ffff0000df4cd0f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_free+0xc0/0x4b8 fs/hfsplus/bitmap.c:182 stack backtrace: CPU: 0 UID: 0 PID: 6566 Comm: syz-executor 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_deadlock_bug+0x2e8/0x2f0 kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain kernel/locking/lockdep.c:3895 [inline] __lock_acquire+0x2940/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x140/0x2e0 kernel/locking/lockdep.c:5868 __mutex_lock_common+0x1d0/0x2678 kernel/locking/mutex.c:614 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 hfsplus_get_block+0x2d4/0x1268 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:2496 do_read_cache_folio+0x370/0x5c8 mm/filemap.c:4096 do_read_cache_page mm/filemap.c:4162 [inline] read_cache_page+0x6c/0x160 mm/filemap.c:4171 read_mapping_page include/linux/pagemap.h:1011 [inline] hfsplus_block_free+0x114/0x4b8 fs/hfsplus/bitmap.c:185 hfsplus_free_extents+0x108/0x890 fs/hfsplus/extents.c:360 hfsplus_file_truncate+0x5d0/0xa58 fs/hfsplus/extents.c:588 hfsplus_delete_inode+0x164/0x210 fs/hfsplus/inode.c:-1 hfsplus_unlink+0x404/0x63c fs/hfsplus/dir.c:405 vfs_unlink+0x304/0x544 fs/namei.c:5369 do_unlinkat+0x26c/0x48c fs/namei.c:5439 __do_sys_unlinkat fs/namei.c:5469 [inline] __se_sys_unlinkat fs/namei.c:5462 [inline] __arm64_sys_unlinkat+0xdc/0xf8 fs/namei.c:5462 __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/0x26c 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: unable to mark blocks free: error -5 hfsplus: can't free extent: start 144, count 1 hfsplus: unable to mark blocks free: error -5 hfsplus: can't free extent: start 131, count 2 hfsplus: unable to mark blocks free: error -5 hfsplus: can't free extent: start 133, count 1 hfsplus: invalid extended attribute record hfsplus: unable to mark blocks free: error -5 hfsplus: can't free extent: start 134, count 1 hfsplus: unable to mark blocks free: error -5 hfsplus: can't free extent: start 135, count 9