=====================================================
BUG: KMSAN: uninit-value in get_match_len fs/ntfs3/lznt.c:43 [inline]
BUG: KMSAN: uninit-value in longest_match_std+0x589/0xee0 fs/ntfs3/lznt.c:64
 get_match_len fs/ntfs3/lznt.c:43 [inline]
 longest_match_std+0x589/0xee0 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+0xad0/0x1510 fs/ntfs3/frecord.c:2729
 ntfs_compress_write+0x2765/0x3940 fs/ntfs3/file.c:1200
 ntfs_file_write_iter+0xf39/0x10d0 fs/ntfs3/file.c:1317
 __kernel_write_iter+0x6f9/0xdd0 fs/read_write.c:619
 __kernel_write+0xc8/0x100 fs/read_write.c:639
 __dump_emit fs/coredump.c:1220 [inline]
 dump_emit+0xf3a/0x12e0 fs/coredump.c:1258
 elf_core_dump+0x5383/0x6c30 fs/binfmt_elf.c:2063
 coredump_write+0x209c/0x2d30 fs/coredump.c:1049
 do_coredump fs/coredump.c:1126 [inline]
 vfs_coredump+0x7a08/0x8d90 fs/coredump.c:1200
 get_signal+0x2068/0x29d0 kernel/signal.c:3019
 arch_do_signal_or_restart+0x53/0xc00 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x118/0x1b10 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x1d7/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 __alloc_frozen_pages_noprof+0x6df/0xf50 mm/page_alloc.c:5263
 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2486
 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline]
 alloc_pages_noprof mm/mempolicy.c:2577 [inline]
 folio_alloc_noprof+0x108/0x360 mm/mempolicy.c:2587
 filemap_alloc_folio_noprof+0xd9/0x480 mm/filemap.c:1013
 __filemap_get_folio_mpol+0xb43/0x1960 mm/filemap.c:2006
 __filemap_get_folio include/linux/pagemap.h:774 [inline]
 ntfs_get_frame_pages+0xdf/0x5f0 fs/ntfs3/file.c:996
 ntfs_compress_write+0x1cf2/0x3940 fs/ntfs3/file.c:1149
 ntfs_file_write_iter+0xf39/0x10d0 fs/ntfs3/file.c:1317
 __kernel_write_iter+0x6f9/0xdd0 fs/read_write.c:619
 __kernel_write+0xc8/0x100 fs/read_write.c:639
 __dump_emit fs/coredump.c:1220 [inline]
 dump_emit+0xf3a/0x12e0 fs/coredump.c:1258
 elf_core_dump+0x5383/0x6c30 fs/binfmt_elf.c:2063
 coredump_write+0x209c/0x2d30 fs/coredump.c:1049
 do_coredump fs/coredump.c:1126 [inline]
 vfs_coredump+0x7a08/0x8d90 fs/coredump.c:1200
 get_signal+0x2068/0x29d0 kernel/signal.c:3019
 arch_do_signal_or_restart+0x53/0xc00 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x118/0x1b10 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x1d7/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 10765 Comm: syz.6.1307 Tainted: G             L      syzkaller #0 PREEMPT(voluntary) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
=====================================================