============================================ WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- syz.7.274/7809 is trying to acquire lock: ffff888039e1e9f8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x3a0/0x1670 fs/hfsplus/extents.c:260 but task is already holding lock: ffff888039e180f8 (&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 6 locks held by syz.7.274/7809: #0: ffff8880387b6480 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493 #1: ffff888039e1e4d8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1073 [inline] #1: ffff888039e1e4d8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: lock_rename fs/namei.c:3756 [inline] #1: ffff888039e1e4d8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: __start_renaming+0x148/0x410 fs/namei.c:3852 #2: ffff888032f36c58 (&sb->s_type->i_mutex_key#30){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #2: ffff888032f36c58 (&sb->s_type->i_mutex_key#30){++++}-{4:4}, at: vfs_rename+0x6d7/0xeb0 fs/namei.c:-1 #3: ffff8880626b20a0 (&tree->tree_lock){+.+.}-{4:4}, at: hfsplus_find_init+0x168/0x2d0 fs/hfsplus/bfind.c:28 #4: ffff888039e180f8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x215/0x1d70 fs/hfsplus/extents.c:453 #5: ffff88803f1fa0e8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0xa7/0xce0 fs/hfsplus/bitmap.c:35 stack backtrace: CPU: 1 UID: 0 PID: 7809 Comm: syz.7.274 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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+0xf0/0x2e0 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/rtmutex_api.c:533 [inline] mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:552 hfsplus_get_block+0x3a0/0x1670 fs/hfsplus/extents.c:260 block_read_full_folio+0x29f/0x830 fs/buffer.c:2417 filemap_read_folio+0x137/0x3b0 mm/filemap.c:2496 do_read_cache_folio+0x2bf/0x560 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+0x128/0x520 fs/hfsplus/btree.c:358 hfsplus_rename_cat+0x22a/0x1000 fs/hfsplus/catalog.c:456 hfsplus_rename+0x135/0x1f0 fs/hfsplus/dir.c:596 vfs_rename+0xa96/0xeb0 fs/namei.c:6026 filename_renameat2+0x539/0x9c0 fs/namei.c:6144 __do_sys_renameat2 fs/namei.c:6173 [inline] __se_sys_renameat2+0x5a/0x2c0 fs/namei.c:6168 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f056bc5c799 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:00007f0569eae028 EFLAGS: 00000246 ORIG_RAX: 000000000000013c RAX: ffffffffffffffda RBX: 00007f056bed5fa0 RCX: 00007f056bc5c799 RDX: ffffffffffffff9c RSI: 0000200000000280 RDI: ffffffffffffff9c RBP: 00007f056bcf2bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 000020000001ff00 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f056bed6038 R14: 00007f056bed5fa0 R15: 00007ffc0f15ca38 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: 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