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Message-ID: <CACGkMEt0aJh1yAj+q1UNnXToLa_yGc9fT_HfeNptHsOQ7vXG+w@mail.gmail.com> Date: Mon, 13 Oct 2025 13:29:26 +0800 From: Jason Wang <jasowang@...hat.com> To: syzbot <syzbot+ac856b8b866cca41352c@...kaller.appspotmail.com>, Paolo Abeni <pabeni@...hat.com> Cc: eperezma@...hat.com, linux-kernel@...r.kernel.org, mst@...hat.com, syzkaller-bugs@...glegroups.com, virtualization@...ts.linux.dev, xuanzhuo@...ux.alibaba.com Subject: Re: [syzbot] [virt?] upstream test error: KMSAN: use-after-free in vring_map_one_sg Adding Paolo. On Sat, Oct 11, 2025 at 3:40 PM Jason Wang <jasowang@...hat.com> wrote: > > #syz test > > On Sat, Oct 11, 2025 at 4:38 AM syzbot > <syzbot+ac856b8b866cca41352c@...kaller.appspotmail.com> wrote: Paolo, it looks like the GSO tunnel features will leave uninitialized vnet header field which trigger KMSAN warning. Please have a look at the patch (which has been tested by syzbot) or propose another one. Thanks > > > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: ba9dac987319 Merge tag 'libnvdimm-for-6.18' of git://git.k.. > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=138581e2580000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=ad506767107aacda > > dashboard link: https://syzkaller.appspot.com/bug?extid=ac856b8b866cca41352c > > compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/ce6a737acd38/disk-ba9dac98.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/d7053b626642/vmlinux-ba9dac98.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/13f2d7e62179/bzImage-ba9dac98.xz > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+ac856b8b866cca41352c@...kaller.appspotmail.com > > > > 8021q: adding VLAN 0 to HW filter on device bond0 > > eql: remember to turn off Van-Jacobson compression on your slave devices > > ===================================================== > > BUG: KMSAN: use-after-free in vring_map_one_sg+0x290/0x7b0 drivers/virtio/virtio_ring.c:401 > > vring_map_one_sg+0x290/0x7b0 drivers/virtio/virtio_ring.c:401 > > virtqueue_add_split drivers/virtio/virtio_ring.c:608 [inline] > > virtqueue_add+0x32aa/0x6320 drivers/virtio/virtio_ring.c:2281 > > virtqueue_add_outbuf+0x89/0xa0 drivers/virtio/virtio_ring.c:2342 > > virtnet_add_outbuf drivers/net/virtio_net.c:574 [inline] > > xmit_skb drivers/net/virtio_net.c:3343 [inline] > > start_xmit+0x274d/0x4860 drivers/net/virtio_net.c:3367 > > __netdev_start_xmit include/linux/netdevice.h:5248 [inline] > > netdev_start_xmit include/linux/netdevice.h:5257 [inline] > > xmit_one net/core/dev.c:3845 [inline] > > dev_hard_start_xmit+0x22c/0xa30 net/core/dev.c:3861 > > sch_direct_xmit+0x3b2/0xcf0 net/sched/sch_generic.c:344 > > __dev_xmit_skb net/core/dev.c:4152 [inline] > > __dev_queue_xmit+0x3588/0x5e60 net/core/dev.c:4729 > > dev_queue_xmit include/linux/netdevice.h:3365 [inline] > > lapbeth_data_transmit+0x352/0x480 drivers/net/wan/lapbether.c:260 > > lapb_data_transmit+0x90/0xf0 net/lapb/lapb_iface.c:447 > > lapb_transmit_buffer+0x260/0x330 net/lapb/lapb_out.c:149 > > lapb_send_control+0x458/0x5b0 net/lapb/lapb_subr.c:251 > > lapb_establish_data_link+0xa6/0xd0 net/lapb/lapb_out.c:-1 > > lapb_device_event+0xb2a/0xbc0 net/lapb/lapb_iface.c:-1 > > notifier_call_chain kernel/notifier.c:85 [inline] > > raw_notifier_call_chain+0xe0/0x410 kernel/notifier.c:453 > > call_netdevice_notifiers_info+0x1ac/0x2b0 net/core/dev.c:2229 > > call_netdevice_notifiers_extack net/core/dev.c:2267 [inline] > > call_netdevice_notifiers net/core/dev.c:2281 [inline] > > __dev_notify_flags+0x20d/0x3c0 net/core/dev.c:-1 > > netif_change_flags+0x162/0x1e0 net/core/dev.c:9705 > > dev_change_flags+0x18c/0x320 net/core/dev_api.c:68 > > devinet_ioctl+0x1186/0x2500 net/ipv4/devinet.c:1199 > > inet_ioctl+0x4c0/0x6f0 net/ipv4/af_inet.c:1003 > > sock_do_ioctl+0x9c/0x480 net/socket.c:1254 > > sock_ioctl+0x70b/0xd60 net/socket.c:1375 > > vfs_ioctl fs/ioctl.c:51 [inline] > > __do_sys_ioctl fs/ioctl.c:597 [inline] > > __se_sys_ioctl+0x239/0x400 fs/ioctl.c:583 > > __x64_sys_ioctl+0x97/0xe0 fs/ioctl.c:583 > > x64_sys_call+0x1cbc/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:17 > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 > > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > > > Uninit was created at: > > slab_free_hook mm/slub.c:2440 [inline] > > slab_free mm/slub.c:6566 [inline] > > kmem_cache_free+0x2b0/0x1490 mm/slub.c:6676 > > skb_kfree_head net/core/skbuff.c:1046 [inline] > > skb_free_head+0x13c/0x3a0 net/core/skbuff.c:1060 > > skb_release_data+0x9f7/0xac0 net/core/skbuff.c:1087 > > skb_release_all net/core/skbuff.c:1152 [inline] > > __kfree_skb+0x6b/0x260 net/core/skbuff.c:1166 > > consume_skb+0x83/0x230 net/core/skbuff.c:1398 > > skb_free_datagram+0x1e/0x30 net/core/datagram.c:324 > > netlink_recvmsg+0xad1/0xfe0 net/netlink/af_netlink.c:1974 > > sock_recvmsg_nosec net/socket.c:1078 [inline] > > sock_recvmsg+0x2dc/0x390 net/socket.c:1100 > > ____sys_recvmsg+0x193/0x610 net/socket.c:2850 > > ___sys_recvmsg+0x20b/0x850 net/socket.c:2892 > > __sys_recvmsg net/socket.c:2925 [inline] > > __do_sys_recvmsg net/socket.c:2931 [inline] > > __se_sys_recvmsg net/socket.c:2928 [inline] > > __x64_sys_recvmsg+0x20e/0x3d0 net/socket.c:2928 > > x64_sys_call+0x35f0/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:48 > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 > > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > > > Bytes 0-17 of 18 are uninitialized > > Memory access of size 18 starts at ffff88811a0f1000 > > > > CPU: 1 UID: 0 PID: 5441 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(none) > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 > > ===================================================== > > > > > > --- > > 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 syzkaller@...glegroups.com. > > > > 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 > >
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