syzbot

ntfs3: loop2: Mark volume as dirty due to NTFS errors
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BUG: KMSAN: uninit-value in longest_match_std+0x5d9/0xe00 fs/ntfs3/lznt.c:60
 longest_match_std+0x5d9/0xe00 fs/ntfs3/lznt.c:60
 compress_chunk fs/ntfs3/lznt.c:170 [inline]
 compress_lznt+0x41b/0xef0 fs/ntfs3/lznt.c:336
 ni_write_frame+0xf89/0x1c80 fs/ntfs3/frecord.c:2839
 ntfs_compress_write+0x2521/0x3b70 fs/ntfs3/file.c:994
 ntfs_file_write_iter+0x89b/0xd30 fs/ntfs3/file.c:1080
 do_iter_write+0x60c/0x1420 fs/read_write.c:860
 vfs_writev+0x329/0x7b0 fs/read_write.c:933
 do_writev+0x251/0x5b0 fs/read_write.c:976
 __do_sys_writev fs/read_write.c:1049 [inline]
 __se_sys_writev fs/read_write.c:1046 [inline]
 __ia32_sys_writev+0x95/0xe0 fs/read_write.c:1046
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was created at:
 __alloc_pages+0x9a4/0xe00 mm/page_alloc.c:4449
 alloc_pages+0xd01/0x1040
 folio_alloc+0x42/0x120 mm/mempolicy.c:2307
 filemap_alloc_folio+0xa5/0x430 mm/filemap.c:976
 __filemap_get_folio+0xa76/0x1450 mm/filemap.c:1936
 pagecache_get_page+0x4a/0x2e0 mm/folio-compat.c:99
 find_or_create_page include/linux/pagemap.h:723 [inline]
 ntfs_get_frame_pages+0xdc/0x9f0 fs/ntfs3/file.c:793
 ntfs_compress_write+0x1b0b/0x3b70 fs/ntfs3/file.c:943
 ntfs_file_write_iter+0x89b/0xd30 fs/ntfs3/file.c:1080
 do_iter_write+0x60c/0x1420 fs/read_write.c:860
 vfs_writev+0x329/0x7b0 fs/read_write.c:933
 do_writev+0x251/0x5b0 fs/read_write.c:976
 __do_sys_writev fs/read_write.c:1049 [inline]
 __se_sys_writev fs/read_write.c:1046 [inline]
 __ia32_sys_writev+0x95/0xe0 fs/read_write.c:1046
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

CPU: 1 PID: 7469 Comm: syz-executor.2 Not tainted 6.6.0-rc6-syzkaller-00043-gdd72f9c7e512 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
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