============================================ WARNING: possible recursive locking detected 6.15.0-rc5-syzkaller-00300-g3ce9925823c7 #0 Not tainted -------------------------------------------- syz.9.328/8767 is trying to acquire lock: ffff888057f65208 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x39e/0x1530 fs/hfsplus/extents.c:260 but task is already holding lock: ffff888057f65f88 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1fc/0x1990 fs/hfsplus/extents.c:458 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 4 locks held by syz.9.328/8767: #0: ffff88804ebb6420 (sb_writers#32){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:556 #1: ffff888057f66178 (&sb->s_type->i_mutex_key#37){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #1: ffff888057f66178 (&sb->s_type->i_mutex_key#37){+.+.}-{4:4}, at: do_truncate+0x186/0x220 fs/open.c:63 #2: ffff888057f65f88 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1fc/0x1990 fs/hfsplus/extents.c:458 #3: ffff88807c1c88f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0x9d/0x8e0 fs/hfsplus/bitmap.c:35 stack backtrace: CPU: 0 UID: 0 PID: 8767 Comm: syz.9.328 Not tainted 6.15.0-rc5-syzkaller-00300-g3ce9925823c7 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_deadlock_bug+0x28b/0x2a0 kernel/locking/lockdep.c:3042 check_deadlock kernel/locking/lockdep.c:3094 [inline] validate_chain+0x1a3f/0x2140 kernel/locking/lockdep.c:3896 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746 hfsplus_get_block+0x39e/0x1530 fs/hfsplus/extents.c:260 block_read_full_folio+0x29c/0x830 fs/buffer.c:2427 filemap_read_folio+0x114/0x380 mm/filemap.c:2401 do_read_cache_folio+0x354/0x590 mm/filemap.c:3885 do_read_cache_page mm/filemap.c:3951 [inline] read_cache_page+0x5d/0x170 mm/filemap.c:3960 read_mapping_page include/linux/pagemap.h:989 [inline] hfsplus_block_allocate+0xff/0x8e0 fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0xae3/0x1990 fs/hfsplus/extents.c:469 hfsplus_get_block+0x411/0x1530 fs/hfsplus/extents.c:245 __block_write_begin_int+0x6b2/0x1900 fs/buffer.c:2151 block_write_begin fs/buffer.c:2262 [inline] cont_write_begin+0x789/0xb50 fs/buffer.c:2601 hfsplus_write_begin+0x66/0xb0 fs/hfsplus/inode.c:46 cont_expand_zero fs/buffer.c:2528 [inline] cont_write_begin+0x2fa/0xb50 fs/buffer.c:2591 hfsplus_write_begin+0x66/0xb0 fs/hfsplus/inode.c:46 generic_cont_expand_simple+0x13c/0x210 fs/buffer.c:2492 hfsplus_setattr+0x169/0x270 fs/hfsplus/inode.c:258 notify_change+0xb33/0xe40 fs/attr.c:552 do_truncate+0x19a/0x220 fs/open.c:65 vfs_truncate+0x493/0x520 fs/open.c:115 do_sys_truncate+0xdb/0x190 fs/open.c:138 __do_sys_truncate fs/open.c:150 [inline] __se_sys_truncate fs/open.c:148 [inline] __x64_sys_truncate+0x5b/0x70 fs/open.c:148 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f77f538e969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f77f6158038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007f77f55b5fa0 RCX: 00007f77f538e969 RDX: 0000000000000000 RSI: 000000000000fbb0 RDI: 0000200000000000 RBP: 00007f77f5410ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f77f55b5fa0 R15: 00007ffd9ed8a518