============================================ WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- syz.0.0/5323 is trying to acquire lock: ffff888012aad548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x39e/0x1670 fs/hfsplus/extents.c:260 but task is already holding lock: ffff888012aac7c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x215/0x1d70 fs/hfsplus/extents.c:453 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 8 locks held by syz.0.0/5323: #0: ffff888011adc420 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499 #1: ffff888011adc730 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3725 [inline] #1: ffff888011adc730 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: __start_renaming+0xed/0x410 fs/namei.c:3817 #2: ffff888012aaddf8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1072 [inline] #2: ffff888012aaddf8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: lock_two_directories+0x1a2/0x220 fs/namei.c:3701 #3: ffff888012aaf238 (&sb->s_type->i_mutex_key#24/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1072 [inline] #3: ffff888012aaf238 (&sb->s_type->i_mutex_key#24/5){+.+.}-{4:4}, at: lock_two_directories+0x1cc/0x220 fs/namei.c:3702 #4: ffff888012aaeb78 (&type->i_mutex_dir_key#8/2){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1072 [inline] #4: ffff888012aaeb78 (&type->i_mutex_dir_key#8/2){+.+.}-{4:4}, at: vfs_rename+0x7c2/0x1160 fs/namei.c:5893 #5: ffff888000fa60b0 (&tree->tree_lock){+.+.}-{4:4}, at: hfsplus_find_init+0x168/0x2d0 fs/hfsplus/bfind.c:28 #6: ffff888012aac7c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x215/0x1d70 fs/hfsplus/extents.c:453 #7: ffff888012ab58f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0xa7/0xce0 fs/hfsplus/bitmap.c:35 stack backtrace: CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_deadlock_bug+0x279/0x290 kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain kernel/locking/lockdep.c:3895 [inline] __lock_acquire+0x253f/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:614 [inline] __mutex_lock+0x19f/0x1300 kernel/locking/mutex.c:776 hfsplus_get_block+0x39e/0x1670 fs/hfsplus/extents.c:260 block_read_full_folio+0x29f/0x830 fs/buffer.c:2420 filemap_read_folio+0x137/0x3b0 mm/filemap.c:2496 do_read_cache_folio+0x358/0x590 mm/filemap.c:4096 do_read_cache_page mm/filemap.c:4162 [inline] read_cache_page+0x5d/0x170 mm/filemap.c:4171 read_mapping_page include/linux/pagemap.h:1022 [inline] hfsplus_block_allocate+0xf3/0xce0 fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0xb2d/0x1d70 fs/hfsplus/extents.c:464 hfsplus_bmap_reserve+0x125/0x510 fs/hfsplus/btree.c:358 hfsplus_rename_cat+0x22a/0x1000 fs/hfsplus/catalog.c:456 hfsplus_rename+0x135/0x1f0 fs/hfsplus/dir.c:552 vfs_rename+0xdb5/0x1160 fs/namei.c:5938 do_renameat2+0x548/0x900 fs/namei.c:6056 __do_sys_renameat2 fs/namei.c:6086 [inline] __se_sys_renameat2 fs/namei.c:6083 [inline] __x64_sys_renameat2+0xce/0xe0 fs/namei.c:6083 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f51e4b9aeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f51e5a41028 EFLAGS: 00000246 ORIG_RAX: 000000000000013c RAX: ffffffffffffffda RBX: 00007f51e4e16090 RCX: 00007f51e4b9aeb9 RDX: 000000000000000c RSI: 0000200000000000 RDI: 000000000000000c RBP: 00007f51e4c08c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000200000000140 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f51e4e16128 R14: 00007f51e4e16090 R15: 00007ffd77401598