Hello, syzbot found the following issue on: HEAD commit: 54b4a7d3d6c6 kmsan: add memsetXX tests git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=143f81e4c80000 kernel config: https://syzkaller.appspot.com/x/.config?x=46c642641b9ef616 dashboard link: https://syzkaller.appspot.com/bug?extid=048585f3f4227bb2b49b compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/b2a457fb4580/disk-54b4a7d3.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1acddc397ddb/vmlinux-54b4a7d3.xz kernel image: https://storage.googleapis.com/syzbot-assets/eceee3367163/bzImage-54b4a7d3.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+048585f3f4227bb2b49b@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in crc32_body lib/crc32.c:110 [inline] BUG: KMSAN: uninit-value in crc32_le_generic lib/crc32.c:179 [inline] BUG: KMSAN: uninit-value in crc32_le_base+0x446/0xd80 lib/crc32.c:197 crc32_body lib/crc32.c:110 [inline] crc32_le_generic lib/crc32.c:179 [inline] crc32_le_base+0x446/0xd80 lib/crc32.c:197 nilfs_segbuf_fill_in_segsum_crc fs/nilfs2/segbuf.c:182 [inline] nilfs_add_checksums_on_logs+0x2ce/0xe30 fs/nilfs2/segbuf.c:320 nilfs_segctor_do_construct+0xa553/0xe900 fs/nilfs2/segment.c:2076 nilfs_segctor_construct+0x1eb/0xe30 fs/nilfs2/segment.c:2379 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2487 [inline] nilfs_segctor_thread+0xc76/0x1240 fs/nilfs2/segment.c:2570 kthread+0x31f/0x430 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Uninit was stored to memory at: nilfs_write_dat_node_binfo+0x12c/0x280 fs/nilfs2/segment.c:658 nilfs_segctor_assign fs/nilfs2/segment.c:1629 [inline] nilfs_segctor_do_construct+0x753c/0xe900 fs/nilfs2/segment.c:2056 nilfs_segctor_construct+0x1eb/0xe30 fs/nilfs2/segment.c:2379 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2487 [inline] nilfs_segctor_thread+0xc76/0x1240 fs/nilfs2/segment.c:2570 kthread+0x31f/0x430 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Local variable binfo.i.i created at: nilfs_segctor_update_payload_blocknr fs/nilfs2/segment.c:1562 [inline] nilfs_segctor_assign fs/nilfs2/segment.c:1629 [inline] nilfs_segctor_do_construct+0x6ac9/0xe900 fs/nilfs2/segment.c:2056 nilfs_segctor_construct+0x1eb/0xe30 fs/nilfs2/segment.c:2379 CPU: 1 PID: 28393 Comm: segctord Not tainted 6.2.0-syzkaller-81157-g54b4a7d3d6c6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 ===================================================== --- 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 syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
