On Fri, Jun 7, 2024 at 8:34 AM Jason Wang <jasowang@xxxxxxxxxx> wrote: > > On Thu, Jun 6, 2024 at 7:13 PM Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx> wrote: > > > > Add kmsan for virtqueue_dma_map_single_attrs to fix: > > > > BUG: KMSAN: uninit-value in receive_buf+0x45ca/0x6990 > > receive_buf+0x45ca/0x6990 > > virtnet_poll+0x17e0/0x3130 > > net_rx_action+0x832/0x26e0 > > handle_softirqs+0x330/0x10f0 > > [...] > > > > Uninit was created at: > > __alloc_pages_noprof+0x62a/0xe60 > > alloc_pages_noprof+0x392/0x830 > > skb_page_frag_refill+0x21a/0x5c0 > > virtnet_rq_alloc+0x50/0x1500 > > try_fill_recv+0x372/0x54c0 > > virtnet_open+0x210/0xbe0 > > __dev_open+0x56e/0x920 > > __dev_change_flags+0x39c/0x2000 > > dev_change_flags+0xaa/0x200 > > do_setlink+0x197a/0x7420 > > rtnl_setlink+0x77c/0x860 > > [...] > > > > Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx> > > Tested-by: Alexander Potapenko <glider@xxxxxxxxxx> > > Acked-by: Jason Wang <jasowang@xxxxxxxxxx> Jason, Michael, any chance this patch can make it to 6.10? The bug in question has essentially been blocking KMSAN on syzbot for the past month: https://syzkaller.appspot.com/bug?id=2819883f3d376b703e686e700fde00a01eec62fa The patch should probably have Fixes: b6253b4e21939 ("virtio_ring: introduce dma map api for virtqueue") , but I am not exactly sure why syzkaller only started triggering the bug this year, given that the patch dates back to 2023.
