loop0: detected capacity change from 0 to 64
=====================================================
BUG: KMSAN: uninit-value in __hfs_ext_read_extent fs/hfs/extent.c:160 [inline]
BUG: KMSAN: uninit-value in __hfs_ext_cache_extent+0x69f/0x7e0 fs/hfs/extent.c:179
 __hfs_ext_read_extent fs/hfs/extent.c:160 [inline]
 __hfs_ext_cache_extent+0x69f/0x7e0 fs/hfs/extent.c:179
 hfs_ext_read_extent fs/hfs/extent.c:202 [inline]
 hfs_get_block+0x733/0xf50 fs/hfs/extent.c:366
 __block_write_begin_int+0xa73/0x2f80 fs/buffer.c:2116
 block_write_begin fs/buffer.c:2227 [inline]
 cont_write_begin+0xf84/0x1950 fs/buffer.c:2566
 hfs_write_begin+0x85/0x120 fs/hfs/inode.c:52
 cont_expand_zero fs/buffer.c:2493 [inline]
 cont_write_begin+0x32f/0x1950 fs/buffer.c:2556
 hfs_write_begin+0x85/0x120 fs/hfs/inode.c:52
 hfs_file_truncate+0x1a5/0xd30 fs/hfs/extent.c:494
 hfs_inode_setattr+0x998/0xab0 fs/hfs/inode.c:654
 notify_change+0x1a8e/0x1b80 fs/attr.c:552
 do_truncate+0x22a/0x2b0 fs/open.c:65
 vfs_truncate+0x826/0x8d0 fs/open.c:115
 do_sys_truncate+0x103/0x240 fs/open.c:138
 __do_sys_truncate fs/open.c:150 [inline]
 __se_sys_truncate fs/open.c:148 [inline]
 __x64_sys_truncate+0x6d/0xb0 fs/open.c:148
 x64_sys_call+0x2d52/0x3c80 arch/x86/include/generated/asm/syscalls_64.h:77
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4157 [inline]
 slab_alloc_node mm/slub.c:4200 [inline]
 __do_kmalloc_node mm/slub.c:4330 [inline]
 __kmalloc_noprof+0x946/0x1260 mm/slub.c:4343
 kmalloc_noprof include/linux/slab.h:909 [inline]
 hfs_find_init+0x92/0x260 fs/hfs/bfind.c:21
 hfs_ext_read_extent fs/hfs/extent.c:200 [inline]
 hfs_get_block+0x68d/0xf50 fs/hfs/extent.c:366
 __block_write_begin_int+0xa73/0x2f80 fs/buffer.c:2116
 block_write_begin fs/buffer.c:2227 [inline]
 cont_write_begin+0xf84/0x1950 fs/buffer.c:2566
 hfs_write_begin+0x85/0x120 fs/hfs/inode.c:52
 cont_expand_zero fs/buffer.c:2493 [inline]
 cont_write_begin+0x32f/0x1950 fs/buffer.c:2556
 hfs_write_begin+0x85/0x120 fs/hfs/inode.c:52
 hfs_file_truncate+0x1a5/0xd30 fs/hfs/extent.c:494
 hfs_inode_setattr+0x998/0xab0 fs/hfs/inode.c:654
 notify_change+0x1a8e/0x1b80 fs/attr.c:552
 do_truncate+0x22a/0x2b0 fs/open.c:65
 vfs_truncate+0x826/0x8d0 fs/open.c:115
 do_sys_truncate+0x103/0x240 fs/open.c:138
 __do_sys_truncate fs/open.c:150 [inline]
 __se_sys_truncate fs/open.c:148 [inline]
 __x64_sys_truncate+0x6d/0xb0 fs/open.c:148
 x64_sys_call+0x2d52/0x3c80 arch/x86/include/generated/asm/syscalls_64.h:77
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 6157 Comm: syz.0.15 Not tainted 6.15.0-rc1-syzkaller-g900241a5cc15 #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
=====================================================