#syz set subsystems: ext4, fscrypt On Tue, Oct 14, 2025 at 4:50 PM syzbot <[email protected]> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 3a8660878839 Linux 6.18-rc1 > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=13d25dcd980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=bbd3e7f3c2e28265 > dashboard link: https://syzkaller.appspot.com/bug?extid=7add5c56bc2a14145d20 > compiler: Debian clang version 20.1.8 > (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: > https://storage.googleapis.com/syzbot-assets/d996feb56093/disk-3a866087.raw.xz > vmlinux: > https://storage.googleapis.com/syzbot-assets/fa6f6bc3b02a/vmlinux-3a866087.xz > kernel image: > https://storage.googleapis.com/syzbot-assets/7571083a68d6/bzImage-3a866087.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: [email protected] > > EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w > without journal. Quota mode: writeback. > ===================================================== > BUG: KMSAN: uninit-value in subshift lib/crypto/aes.c:150 [inline] > BUG: KMSAN: uninit-value in aes_encrypt+0x1239/0x1960 lib/crypto/aes.c:283 > subshift lib/crypto/aes.c:150 [inline] > aes_encrypt+0x1239/0x1960 lib/crypto/aes.c:283 > aesti_encrypt+0x7d/0xf0 crypto/aes_ti.c:31 > crypto_ecb_crypt crypto/ecb.c:23 [inline] > crypto_ecb_encrypt2+0x142/0x300 crypto/ecb.c:40 > crypto_lskcipher_crypt_sg+0x3ac/0x930 crypto/lskcipher.c:188 > crypto_lskcipher_encrypt_sg+0x8b/0xc0 crypto/lskcipher.c:207 > crypto_skcipher_encrypt+0x111/0x1e0 crypto/skcipher.c:194 > xts_encrypt+0x2e1/0x570 crypto/xts.c:269 > crypto_skcipher_encrypt+0x18a/0x1e0 crypto/skcipher.c:195 > fscrypt_crypt_data_unit+0x38e/0x590 fs/crypto/crypto.c:139 > fscrypt_encrypt_pagecache_blocks+0x430/0x900 fs/crypto/crypto.c:197 > ext4_bio_write_folio+0x1383/0x30d0 fs/ext4/page-io.c:552 > mpage_submit_folio fs/ext4/inode.c:2080 [inline] > mpage_process_page_bufs+0xf1b/0x13e0 fs/ext4/inode.c:2191 > mpage_prepare_extent_to_map+0x1792/0x2a10 fs/ext4/inode.c:2736 > ext4_do_writepages+0x11b6/0x8020 fs/ext4/inode.c:2877 > ext4_writepages+0x338/0x870 fs/ext4/inode.c:3025 > do_writepages+0x3f2/0x860 mm/page-writeback.c:2604 > filemap_fdatawrite_wbc mm/filemap.c:389 [inline] > __filemap_fdatawrite_range mm/filemap.c:422 [inline] > file_write_and_wait_range+0x6f0/0x7d0 mm/filemap.c:797 > generic_buffers_fsync_noflush+0x79/0x3c0 fs/buffer.c:609 > ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline] > ext4_sync_file+0x587/0x12f0 fs/ext4/fsync.c:147 > vfs_fsync_range+0x1a1/0x240 fs/sync.c:187 > generic_write_sync include/linux/fs.h:3046 [inline] > ext4_buffered_write_iter+0xae9/0xce0 fs/ext4/file.c:305 > ext4_file_write_iter+0x2a2/0x3d90 fs/ext4/file.c:-1 > new_sync_write fs/read_write.c:593 [inline] > vfs_write+0xbe2/0x15d0 fs/read_write.c:686 > ksys_pwrite64 fs/read_write.c:793 [inline] > __do_sys_pwrite64 fs/read_write.c:801 [inline] > __se_sys_pwrite64 fs/read_write.c:798 [inline] > __x64_sys_pwrite64+0x2ab/0x3b0 fs/read_write.c:798 > x64_sys_call+0xe77/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:19 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xd9/0xfa0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Uninit was stored to memory at: > le128_xor include/crypto/b128ops.h:69 [inline] > xts_xor_tweak+0x566/0xbd0 crypto/xts.c:123 > xts_xor_tweak_pre crypto/xts.c:135 [inline] > xts_encrypt+0x278/0x570 crypto/xts.c:268 > crypto_skcipher_encrypt+0x18a/0x1e0 crypto/skcipher.c:195 > fscrypt_crypt_data_unit+0x38e/0x590 fs/crypto/crypto.c:139 > fscrypt_encrypt_pagecache_blocks+0x430/0x900 fs/crypto/crypto.c:197 > ext4_bio_write_folio+0x1383/0x30d0 fs/ext4/page-io.c:552 > mpage_submit_folio fs/ext4/inode.c:2080 [inline] > mpage_process_page_bufs+0xf1b/0x13e0 fs/ext4/inode.c:2191 > mpage_prepare_extent_to_map+0x1792/0x2a10 fs/ext4/inode.c:2736 > ext4_do_writepages+0x11b6/0x8020 fs/ext4/inode.c:2877 > ext4_writepages+0x338/0x870 fs/ext4/inode.c:3025 > do_writepages+0x3f2/0x860 mm/page-writeback.c:2604 > filemap_fdatawrite_wbc mm/filemap.c:389 [inline] > __filemap_fdatawrite_range mm/filemap.c:422 [inline] > file_write_and_wait_range+0x6f0/0x7d0 mm/filemap.c:797 > generic_buffers_fsync_noflush+0x79/0x3c0 fs/buffer.c:609 > ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline] > ext4_sync_file+0x587/0x12f0 fs/ext4/fsync.c:147 > vfs_fsync_range+0x1a1/0x240 fs/sync.c:187 > generic_write_sync include/linux/fs.h:3046 [inline] > ext4_buffered_write_iter+0xae9/0xce0 fs/ext4/file.c:305 > ext4_file_write_iter+0x2a2/0x3d90 fs/ext4/file.c:-1 > new_sync_write fs/read_write.c:593 [inline] > vfs_write+0xbe2/0x15d0 fs/read_write.c:686 > ksys_pwrite64 fs/read_write.c:793 [inline] > __do_sys_pwrite64 fs/read_write.c:801 [inline] > __se_sys_pwrite64 fs/read_write.c:798 [inline] > __x64_sys_pwrite64+0x2ab/0x3b0 fs/read_write.c:798 > x64_sys_call+0xe77/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:19 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xd9/0xfa0 arch/x86/entry/syscall_64.c:94 > 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 > write_begin_get_folio include/linux/pagemap.h:784 [inline] > ext4_write_begin+0x6d9/0x2d70 fs/ext4/inode.c:1318 > generic_perform_write+0x365/0x1050 mm/filemap.c:4242 > ext4_buffered_write_iter+0x61a/0xce0 fs/ext4/file.c:299 > ext4_file_write_iter+0x2a2/0x3d90 fs/ext4/file.c:-1 > new_sync_write fs/read_write.c:593 [inline] > vfs_write+0xbe2/0x15d0 fs/read_write.c:686 > ksys_pwrite64 fs/read_write.c:793 [inline] > __do_sys_pwrite64 fs/read_write.c:801 [inline] > __se_sys_pwrite64 fs/read_write.c:798 [inline] > __x64_sys_pwrite64+0x2ab/0x3b0 fs/read_write.c:798 > x64_sys_call+0xe77/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:19 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xd9/0xfa0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > CPU: 1 UID: 0 PID: 5879 Comm: syz.5.3882 Tainted: G W > syzkaller #0 PREEMPT(none) > Tainted: [W]=WARN > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 10/02/2025 > ===================================================== > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at [email protected]. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want to overwrite report's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup > > -- > You received this message because you are subscribed to the Google Groups > "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/d/msgid/syzkaller-bugs/68ee633c.050a0220.1186a4.002a.GAE%40google.com.
