=====================================================
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+0x4a0/0xe90 fs/ntfs3/lznt.c:339
 ni_write_frame+0xff4/0x1f10 fs/ntfs3/frecord.c:2779
 ntfs_compress_write+0x2768/0x3950 fs/ntfs3/file.c:1135
 ntfs_file_write_iter+0xf39/0x10d0 fs/ntfs3/file.c:1252
 __kernel_write_iter+0x6fa/0xdd0 fs/read_write.c:619
 __kernel_write+0xc8/0x100 fs/read_write.c:639
 __dump_emit fs/coredump.c:1220 [inline]
 dump_emit+0x3a0/0x5d0 fs/coredump.c:1258
 elf_core_dump+0x53c8/0x6cb0 fs/binfmt_elf.c:2063
 coredump_write+0x20e3/0x2d50 fs/coredump.c:1049
 vfs_coredump+0x437b/0x6030 fs/coredump.c:1170
 get_signal+0x20a9/0x2a20 kernel/signal.c:3019
 arch_do_signal_or_restart+0x53/0xb90 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0xe7/0x370 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x1e3/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 __alloc_frozen_pages_noprof+0x689/0xf00 mm/page_alloc.c:5206
 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2416
 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
 alloc_pages_noprof mm/mempolicy.c:2507 [inline]
 folio_alloc_noprof+0x109/0x360 mm/mempolicy.c:2517
 filemap_alloc_folio_noprof+0x9d/0x420 mm/filemap.c:1020
 __filemap_get_folio+0xb45/0x1930 mm/filemap.c:2012
 ntfs_get_frame_pages+0xdc/0x5f0 fs/ntfs3/file.c:931
 ntfs_compress_write+0x1cf4/0x3950 fs/ntfs3/file.c:1084
 ntfs_file_write_iter+0xf39/0x10d0 fs/ntfs3/file.c:1252
 __kernel_write_iter+0x6fa/0xdd0 fs/read_write.c:619
 __kernel_write+0xc8/0x100 fs/read_write.c:639
 __dump_emit fs/coredump.c:1220 [inline]
 dump_emit+0x3a0/0x5d0 fs/coredump.c:1258
 elf_core_dump+0x53c8/0x6cb0 fs/binfmt_elf.c:2063
 coredump_write+0x20e3/0x2d50 fs/coredump.c:1049
 vfs_coredump+0x437b/0x6030 fs/coredump.c:1170
 get_signal+0x20a9/0x2a20 kernel/signal.c:3019
 arch_do_signal_or_restart+0x53/0xb90 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0xe7/0x370 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x1e3/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 15347 Comm: syz.8.2586 Tainted: G        W           syzkaller #0 PREEMPT(none) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
=====================================================