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AJvYcCWQ5wYnb9iV+/dw+iUfboG+GfFHEeeTmmiQHZqms3hoC1HICMSfZq8tUjEgYMZPZE0xPEZecbZ3824wi9MNFib+eXkbrphCd6JeH5wq X-Gm-Message-State: AOJu0YzxodubI1BRBxqr5t14Md07FJyq9yu9HD7ygAITjZ1VsHWAJqx+ r+lvN2gy0g4X6csfllB6dJIMiK2Vhkl88Pi6I5EpQsZq0Bq6/zJKZa9LTvfS1qcpxiXfgAeJ6E8 t1OCj0hHnJV7dApuClQPLmxn3+TfM1PEO6eA4nTTyVZTQyie4GYl4myY= X-Google-Smtp-Source: AGHT+IGRA246eEQR+BdalWbRGyq/2ZMYmg6/DldD6CwxiHhCrwWSQIWPK3/9yIIhyajGLT2KBle/ous5VmXYVLTuTzImdT4wtZkh Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1a0a:b0:365:1c10:9ce2 with SMTP id s10-20020a056e021a0a00b003651c109ce2mr188048ild.2.1708822322533; Sat, 24 Feb 2024 16:52:02 -0800 (PST) Date: Sat, 24 Feb 2024 16:52:02 -0800 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000084dd6f06122a33c5@google.com> Subject: Re: [syzbot] [mm] KMSAN: uninit-value in virtqueue_add (4) From: syzbot To: eadavis@qq.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KMSAN: uninit-value in virtqueue_add ===================================================== BUG: KMSAN: uninit-value in vring_map_one_sg drivers/virtio/virtio_ring.c:380 [inline] BUG: KMSAN: uninit-value in virtqueue_add_split drivers/virtio/virtio_ring.c:614 [inline] BUG: KMSAN: uninit-value in virtqueue_add+0x21c6/0x6530 drivers/virtio/virtio_ring.c:2210 vring_map_one_sg drivers/virtio/virtio_ring.c:380 [inline] virtqueue_add_split drivers/virtio/virtio_ring.c:614 [inline] virtqueue_add+0x21c6/0x6530 drivers/virtio/virtio_ring.c:2210 virtqueue_add_sgs+0x186/0x1a0 drivers/virtio/virtio_ring.c:2244 __virtscsi_add_cmd drivers/scsi/virtio_scsi.c:467 [inline] virtscsi_add_cmd+0x817/0xa90 drivers/scsi/virtio_scsi.c:501 virtscsi_queuecommand+0x896/0xa60 drivers/scsi/virtio_scsi.c:598 scsi_dispatch_cmd drivers/scsi/scsi_lib.c:1516 [inline] scsi_queue_rq+0x4874/0x5790 drivers/scsi/scsi_lib.c:1758 blk_mq_dispatch_rq_list+0x13f8/0x3600 block/blk-mq.c:2049 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:170 [inline] blk_mq_do_dispatch_sched block/blk-mq-sched.c:184 [inline] __blk_mq_sched_dispatch_requests+0x10af/0x2500 block/blk-mq-sched.c:309 blk_mq_sched_dispatch_requests+0x160/0x2d0 block/blk-mq-sched.c:333 blk_mq_run_work_fn+0xd0/0x280 block/blk-mq.c:2434 process_one_work kernel/workqueue.c:2627 [inline] process_scheduled_works+0x104e/0x1e70 kernel/workqueue.c:2700 worker_thread+0xf45/0x1490 kernel/workqueue.c:2781 kthread+0x3ed/0x540 kernel/kthread.c:388 ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Uninit was created at: __alloc_pages+0x9a4/0xe00 mm/page_alloc.c:4591 alloc_pages_mpol+0x62b/0x9d0 mm/mempolicy.c:2133 alloc_pages mm/mempolicy.c:2204 [inline] folio_alloc+0x1da/0x380 mm/mempolicy.c:2211 filemap_alloc_folio+0xa5/0x430 mm/filemap.c:974 __filemap_get_folio+0xa5a/0x1760 mm/filemap.c:1918 ext4_da_write_begin+0x7f8/0xec0 fs/ext4/inode.c:2891 generic_perform_write+0x3f5/0xc40 mm/filemap.c:3927 ext4_buffered_write_iter+0x564/0xaa0 fs/ext4/file.c:299 ext4_file_write_iter+0x20f/0x3460 __kernel_write_iter+0x329/0x930 fs/read_write.c:517 dump_emit_page fs/coredump.c:888 [inline] dump_user_range+0x593/0xcd0 fs/coredump.c:915 elf_core_dump+0x528d/0x5a40 fs/binfmt_elf.c:2077 do_coredump+0x32c9/0x4920 fs/coredump.c:764 get_signal+0x2185/0x2d10 kernel/signal.c:2890 arch_do_signal_or_restart+0x53/0xca0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop+0xe8/0x320 kernel/entry/common.c:168 exit_to_user_mode_prepare+0x163/0x220 kernel/entry/common.c:204 irqentry_exit_to_user_mode+0xd/0x30 kernel/entry/common.c:309 irqentry_exit+0x16/0x40 kernel/entry/common.c:412 exc_page_fault+0x246/0x6f0 arch/x86/mm/fault.c:1566 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:570 Bytes 0-1023 of 1024 are uninitialized Memory access of size 1024 starts at ffff88801e7d9c00 CPU: 0 PID: 52 Comm: kworker/0:1H Not tainted 6.7.0-syzkaller-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Workqueue: kblockd blk_mq_run_work_fn ===================================================== Tested on: commit: 0dd3ee31 Linux 6.7 git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git v6.7 console output: https://syzkaller.appspot.com/x/log.txt?x=15dee522180000 kernel config: https://syzkaller.appspot.com/x/.config?x=373206b1ae2fe3d4 dashboard link: https://syzkaller.appspot.com/bug?extid=d7521c1e3841ed075a42 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=1524ca02180000