============================================ WARNING: possible recursive locking detected 6.16.0-syzkaller-11129-geacf91b0c78a #0 Not tainted -------------------------------------------- syz.0.0/5355 is trying to acquire lock: ffff88805b3e2108 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x39e/0x1530 fs/hfsplus/extents.c:260 but task is already holding lock: ffff888052a2c7c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1fc/0x1990 fs/hfsplus/extents.c:455 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 7 locks held by syz.0.0/5355: #0: ffff8880007d0428 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557 #1: ffff888052a2d738 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #1: ffff888052a2d738 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: filename_create+0x1f8/0x3c0 fs/namei.c:4139 #2: ffff888052a442f8 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #2: ffff888052a442f8 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: vfs_link+0x3b4/0x6e0 fs/namei.c:4845 #3: ffff888052a1f198 (&sbi->vh_mutex){+.+.}-{4:4}, at: hfsplus_link+0x216/0x6a0 fs/hfsplus/dir.c:316 #4: ffff8880376480b0 (&tree->tree_lock){+.+.}-{4:4}, at: hfsplus_find_init+0x15a/0x1d0 fs/hfsplus/bfind.c:28 #5: ffff888052a2c7c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1fc/0x1990 fs/hfsplus/extents.c:455 #6: ffff888052a1f0f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0x94/0x9b0 fs/hfsplus/bitmap.c:35 stack backtrace: CPU: 0 UID: 0 PID: 5355 Comm: syz.0.0 Not tainted 6.16.0-syzkaller-11129-geacf91b0c78a #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_deadlock_bug+0x28b/0x2a0 kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain+0x1a3f/0x2140 kernel/locking/lockdep.c:3895 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x187/0x1360 kernel/locking/mutex.c:760 hfsplus_get_block+0x39e/0x1530 fs/hfsplus/extents.c:260 block_read_full_folio+0x29c/0x830 fs/buffer.c:2420 filemap_read_folio+0x117/0x380 mm/filemap.c:2413 do_read_cache_folio+0x350/0x590 mm/filemap.c:3957 do_read_cache_page mm/filemap.c:4023 [inline] read_cache_page+0x5d/0x170 mm/filemap.c:4032 read_mapping_page include/linux/pagemap.h:985 [inline] hfsplus_block_allocate+0xe4/0x9b0 fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0xae3/0x1990 fs/hfsplus/extents.c:466 hfsplus_bmap_reserve+0x122/0x500 fs/hfsplus/btree.c:358 hfsplus_rename_cat+0x1aa/0xde0 fs/hfsplus/catalog.c:456 hfsplus_link+0x359/0x6a0 fs/hfsplus/dir.c:323 vfs_link+0x4ed/0x6e0 fs/namei.c:4854 do_linkat+0x272/0x560 fs/namei.c:4924 __do_sys_linkat fs/namei.c:4952 [inline] __se_sys_linkat fs/namei.c:4949 [inline] __x64_sys_linkat+0xd4/0xf0 fs/namei.c:4949 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdb1a18eb69 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:00007fdb1b049038 EFLAGS: 00000246 ORIG_RAX: 0000000000000109 RAX: ffffffffffffffda RBX: 00007fdb1a3b6080 RCX: 00007fdb1a18eb69 RDX: ffffffffffffff9c RSI: 0000200000000000 RDI: ffffffffffffff9c RBP: 00007fdb1a211df1 R08: 0000000000000000 R09: 0000000000000000 R10: 00002000000006c0 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fdb1a3b6080 R15: 00007ffea66a9e98