loop2: 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+0xa6b/0x2f80 fs/buffer.c:2121
 block_write_begin fs/buffer.c:2231 [inline]
 cont_write_begin+0xf82/0x1940 fs/buffer.c:2582
 hfs_write_begin+0x85/0x120 fs/hfs/inode.c:52
 cont_expand_zero fs/buffer.c:2509 [inline]
 cont_write_begin+0x32f/0x1940 fs/buffer.c:2572
 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:503
 do_truncate+0x22a/0x2b0 fs/open.c:65
 vfs_truncate+0x5d4/0x680 fs/open.c:111
 do_sys_truncate+0x104/0x240 fs/open.c:134
 __do_compat_sys_truncate fs/open.c:152 [inline]
 __se_compat_sys_truncate fs/open.c:150 [inline]
 __ia32_compat_sys_truncate+0x6c/0xa0 fs/open.c:150
 ia32_sys_call+0x3c8f/0x40d0 arch/x86/include/generated/asm/syscalls_32.h:93
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4091 [inline]
 slab_alloc_node mm/slub.c:4134 [inline]
 __do_kmalloc_node mm/slub.c:4263 [inline]
 __kmalloc_noprof+0x661/0xf30 mm/slub.c:4276
 kmalloc_noprof include/linux/slab.h:882 [inline]
 hfs_find_init+0x91/0x250 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+0xa6b/0x2f80 fs/buffer.c:2121
 block_write_begin fs/buffer.c:2231 [inline]
 cont_write_begin+0xf82/0x1940 fs/buffer.c:2582
 hfs_write_begin+0x85/0x120 fs/hfs/inode.c:52
 cont_expand_zero fs/buffer.c:2509 [inline]
 cont_write_begin+0x32f/0x1940 fs/buffer.c:2572
 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:503
 do_truncate+0x22a/0x2b0 fs/open.c:65
 vfs_truncate+0x5d4/0x680 fs/open.c:111
 do_sys_truncate+0x104/0x240 fs/open.c:134
 __do_compat_sys_truncate fs/open.c:152 [inline]
 __se_compat_sys_truncate fs/open.c:150 [inline]
 __ia32_compat_sys_truncate+0x6c/0xa0 fs/open.c:150
 ia32_sys_call+0x3c8f/0x40d0 arch/x86/include/generated/asm/syscalls_32.h:93
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

CPU: 1 UID: 0 PID: 6709 Comm: syz.2.270 Not tainted 6.12.0-rc5-syzkaller-00308-g3e5e6c9900c3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
=====================================================