=====================================================
BUG: KMSAN: uninit-value in get_match_len fs/ntfs3/lznt.c:43 [inline]
BUG: KMSAN: uninit-value in longest_match_std+0x588/0xee0 fs/ntfs3/lznt.c:64
 get_match_len fs/ntfs3/lznt.c:43 [inline]
 longest_match_std+0x588/0xee0 fs/ntfs3/lznt.c:64
 compress_chunk fs/ntfs3/lznt.c:170 [inline]
 compress_lznt+0x49d/0xe90 fs/ntfs3/lznt.c:339
 ni_write_frame+0xff8/0x1ef0 fs/ntfs3/frecord.c:2779
 ntfs_compress_write+0x275c/0x3c30 fs/ntfs3/file.c:1172
 ntfs_file_write_iter+0xeb0/0x1040 fs/ntfs3/file.c:1286
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0xb31/0x1560 fs/read_write.c:684
 ksys_write fs/read_write.c:736 [inline]
 __do_sys_write fs/read_write.c:747 [inline]
 __se_sys_write fs/read_write.c:744 [inline]
 __ia32_sys_write+0x1f9/0x4d0 fs/read_write.c:744
 ia32_sys_call+0x30f2/0x42c0 arch/x86/include/generated/asm/syscalls_32.h:5
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Uninit was created at:
 __alloc_frozen_pages_noprof+0x689/0xf00 mm/page_alloc.c:4993
 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2301
 alloc_frozen_pages_noprof mm/mempolicy.c:2372 [inline]
 alloc_pages_noprof mm/mempolicy.c:2392 [inline]
 folio_alloc_noprof+0x109/0x360 mm/mempolicy.c:2402
 filemap_alloc_folio_noprof+0x9d/0x420 mm/filemap.c:1007
 __filemap_get_folio+0xb45/0x1930 mm/filemap.c:1969
 ntfs_get_frame_pages+0xdc/0x5f0 fs/ntfs3/file.c:964
 ntfs_compress_write+0x1d50/0x3c30 fs/ntfs3/file.c:1120
 ntfs_file_write_iter+0xeb0/0x1040 fs/ntfs3/file.c:1286
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0xb31/0x1560 fs/read_write.c:684
 ksys_write fs/read_write.c:736 [inline]
 __do_sys_write fs/read_write.c:747 [inline]
 __se_sys_write fs/read_write.c:744 [inline]
 __ia32_sys_write+0x1f9/0x4d0 fs/read_write.c:744
 ia32_sys_call+0x30f2/0x42c0 arch/x86/include/generated/asm/syscalls_32.h:5
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

CPU: 1 UID: 0 PID: 14224 Comm: syz.8.1540 Not tainted 6.15.0-rc3-syzkaller-00094-g02ddfb981de8 #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
=====================================================