loop5: detected capacity change from 0 to 64
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BUG: KMSAN: uninit-value in __hfs_ext_read_extent fs/hfs/extent.c:160 [inline]
BUG: KMSAN: uninit-value in __hfs_ext_cache_extent+0x677/0x7f0 fs/hfs/extent.c:179
 __hfs_ext_read_extent fs/hfs/extent.c:160 [inline]
 __hfs_ext_cache_extent+0x677/0x7f0 fs/hfs/extent.c:179
 hfs_file_truncate+0x81f/0xe60 fs/hfs/extent.c:526
 hfs_inode_setattr+0x964/0xaa0 fs/hfs/inode.c:654
 notify_change+0x1990/0x1aa0 fs/attr.c:552
 do_truncate+0x224/0x2a0 fs/open.c:65
 handle_truncate fs/namei.c:3501 [inline]
 do_open fs/namei.c:3884 [inline]
 path_openat+0x5d85/0x6760 fs/namei.c:4039
 do_filp_open+0x280/0x660 fs/namei.c:4066
 do_sys_openat2+0x1bb/0x2f0 fs/open.c:1429
 do_sys_open fs/open.c:1444 [inline]
 __do_sys_creat fs/open.c:1522 [inline]
 __se_sys_creat fs/open.c:1516 [inline]
 __x64_sys_creat+0xe1/0x150 fs/open.c:1516
 x64_sys_call+0x14a0/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:86
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x1b0 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:4167 [inline]
 slab_alloc_node mm/slub.c:4210 [inline]
 __do_kmalloc_node mm/slub.c:4340 [inline]
 __kmalloc_noprof+0x95f/0x1310 mm/slub.c:4353
 kmalloc_noprof include/linux/slab.h:909 [inline]
 hfs_find_init+0x93/0x260 fs/hfs/bfind.c:21
 hfs_file_truncate+0x55a/0xe60 fs/hfs/extent.c:512
 hfs_inode_setattr+0x964/0xaa0 fs/hfs/inode.c:654
 notify_change+0x1990/0x1aa0 fs/attr.c:552
 do_truncate+0x224/0x2a0 fs/open.c:65
 handle_truncate fs/namei.c:3501 [inline]
 do_open fs/namei.c:3884 [inline]
 path_openat+0x5d85/0x6760 fs/namei.c:4039
 do_filp_open+0x280/0x660 fs/namei.c:4066
 do_sys_openat2+0x1bb/0x2f0 fs/open.c:1429
 do_sys_open fs/open.c:1444 [inline]
 __do_sys_creat fs/open.c:1522 [inline]
 __se_sys_creat fs/open.c:1516 [inline]
 __x64_sys_creat+0xe1/0x150 fs/open.c:1516
 x64_sys_call+0x14a0/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:86
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 8553 Comm: syz.5.429 Not tainted 6.15.0-rc3-syzkaller-00094-g02ddfb981de8 #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
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