loop0: detected capacity change from 0 to 64
=====================================================
BUG: KMSAN: uninit-value in hfs_find_set_zero_bits+0x836/0xca0 fs/hfs/bitmap.c:45
 hfs_find_set_zero_bits+0x836/0xca0 fs/hfs/bitmap.c:45
 hfs_vbm_search_free+0x141/0x530 fs/hfs/bitmap.c:151
 hfs_extend_file+0x69e/0x19f0 fs/hfs/extent.c:408
 hfs_get_block+0x3d8/0xf50 fs/hfs/extent.c:353
 __block_write_begin_int+0xa6b/0x2f80 fs/buffer.c:2125
 __block_write_begin fs/buffer.c:2174 [inline]
 block_write_begin+0x143/0x450 fs/buffer.c:2235
 cont_write_begin+0xcc0/0x1320 fs/buffer.c:2587
 hfs_write_begin+0x9a/0x140 fs/hfs/inode.c:53
 generic_perform_write+0x4ba/0x12e0 mm/filemap.c:4019
 __generic_file_write_iter+0x20a/0x460 mm/filemap.c:4121
 generic_file_write_iter+0x103/0x5b0 mm/filemap.c:4147
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xb2f/0x1550 fs/read_write.c:590
 ksys_write+0x20f/0x4c0 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:652
 x64_sys_call+0x3490/0x3c10 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:3985 [inline]
 slab_alloc_node mm/slub.c:4028 [inline]
 __kmalloc_cache_noprof+0x4f0/0xb00 mm/slub.c:4175
 kmalloc_noprof include/linux/slab.h:681 [inline]
 hfs_mdb_get+0x1bd4/0x28b0 fs/hfs/mdb.c:175
 hfs_fill_super+0x1cf6/0x23c0 fs/hfs/super.c:407
 mount_bdev+0x39a/0x520 fs/super.c:1668
 hfs_mount+0x4d/0x60 fs/hfs/super.c:457
 legacy_get_tree+0x114/0x290 fs/fs_context.c:662
 vfs_get_tree+0xa7/0x570 fs/super.c:1789
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3472
 path_mount+0x742/0x1f10 fs/namespace.c:3799
 do_mount fs/namespace.c:3812 [inline]
 __do_sys_mount fs/namespace.c:4020 [inline]
 __se_sys_mount+0x722/0x810 fs/namespace.c:3997
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3997
 x64_sys_call+0xed5/0x3c10 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 PID: 5045 Comm: syz-executor118 Not tainted 6.10.0-syzkaller-11185-g2c9b3512402e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
=====================================================