repro
On 14.02.20 08:43, Christian Borntraeger wrote:
>
>
> On 14.02.20 08:40, Eugenio Perez Martin wrote:
>> Hi.
>>
>> Were the vhost and vhost_net modules loaded with dyndbg='+plt'? I miss
>> all the others regular debug traces on that one.
>
> I did
>
> echo -n 'file drivers/vhost/vhost.c +plt' > control
> and
> echo -n 'file drivers/vhost/net.c +plt' > control
>
> but apparently it did not work...me hates dynamic debug.
>
>>
>> Thanks!
>>
>> On Fri, Feb 14, 2020 at 8:34 AM Christian Borntraeger
>> <borntraeger@xxxxxxxxxx> wrote:
>>>
>>> I did
>>> ping -c 20 -f ... ; reboot
>>> twice
>>>
>>> The ping after the first reboot showed .......E
>>>
>>> this was on the host console
>>>
>>> [ 55.951885] CPU: 34 PID: 1908 Comm: CPU 0/KVM Not tainted 5.5.0+ #21
>>> [ 55.951891] Hardware name: IBM 3906 M04 704 (LPAR)
>>> [ 55.951892] Call Trace:
>>> [ 55.951902] [<0000001ede114132>] show_stack+0x8a/0xd0
>>> [ 55.951906] [<0000001edeb0672a>] dump_stack+0x8a/0xb8
>>> [ 55.951915] [<000003ff803736a6>] vhost_vring_ioctl+0x6fe/0x858 [vhost]
>>> [ 55.951919] [<000003ff8042a608>] vhost_net_ioctl+0x510/0x570 [vhost_net]
>>> [ 55.951924] [<0000001ede3c4dd8>] do_vfs_ioctl+0x430/0x6f8
>>> [ 55.951926] [<0000001ede3c5124>] ksys_ioctl+0x84/0xb0
>>> [ 55.951927] [<0000001ede3c51ba>] __s390x_sys_ioctl+0x2a/0x38
>>> [ 55.951931] [<0000001edeb27f72>] system_call+0x2a6/0x2c8
>>> [ 55.951949] CPU: 34 PID: 1908 Comm: CPU 0/KVM Not tainted 5.5.0+ #21
>>> [ 55.951950] Hardware name: IBM 3906 M04 704 (LPAR)
>>> [ 55.951951] Call Trace:
>>> [ 55.951952] [<0000001ede114132>] show_stack+0x8a/0xd0
>>> [ 55.951954] [<0000001edeb0672a>] dump_stack+0x8a/0xb8
>>> [ 55.951956] [<000003ff803736a6>] vhost_vring_ioctl+0x6fe/0x858 [vhost]
>>> [ 55.951958] [<000003ff8042a608>] vhost_net_ioctl+0x510/0x570 [vhost_net]
>>> [ 55.951959] [<0000001ede3c4dd8>] do_vfs_ioctl+0x430/0x6f8
>>> [ 55.951961] [<0000001ede3c5124>] ksys_ioctl+0x84/0xb0
>>> [ 55.951962] [<0000001ede3c51ba>] __s390x_sys_ioctl+0x2a/0x38
>>> [ 55.951964] [<0000001edeb27f72>] system_call+0x2a6/0x2c8
>>> [ 55.951997] Guest moved vq 0000000063d896c6 used index from 44 to 0
>>> [ 56.609831] unexpected descriptor format for RX: out 0, in 0
>>> [ 86.540460] CPU: 6 PID: 1908 Comm: CPU 0/KVM Not tainted 5.5.0+ #21
>>> [ 86.540464] Hardware name: IBM 3906 M04 704 (LPAR)
>>> [ 86.540466] Call Trace:
>>> [ 86.540473] [<0000001ede114132>] show_stack+0x8a/0xd0
>>> [ 86.540477] [<0000001edeb0672a>] dump_stack+0x8a/0xb8
>>> [ 86.540486] [<000003ff803736a6>] vhost_vring_ioctl+0x6fe/0x858 [vhost]
>>> [ 86.540490] [<000003ff8042a608>] vhost_net_ioctl+0x510/0x570 [vhost_net]
>>> [ 86.540494] [<0000001ede3c4dd8>] do_vfs_ioctl+0x430/0x6f8
>>> [ 86.540496] [<0000001ede3c5124>] ksys_ioctl+0x84/0xb0
>>> [ 86.540498] [<0000001ede3c51ba>] __s390x_sys_ioctl+0x2a/0x38
>>> [ 86.540501] [<0000001edeb27f72>] system_call+0x2a6/0x2c8
>>> [ 86.540524] CPU: 6 PID: 1908 Comm: CPU 0/KVM Not tainted 5.5.0+ #21
>>> [ 86.540525] Hardware name: IBM 3906 M04 704 (LPAR)
>>> [ 86.540526] Call Trace:
>>> [ 86.540527] [<0000001ede114132>] show_stack+0x8a/0xd0
>>> [ 86.540528] [<0000001edeb0672a>] dump_stack+0x8a/0xb8
>>> [ 86.540531] [<000003ff803736a6>] vhost_vring_ioctl+0x6fe/0x858 [vhost]
>>> [ 86.540532] [<000003ff8042a608>] vhost_net_ioctl+0x510/0x570 [vhost_net]
>>> [ 86.540534] [<0000001ede3c4dd8>] do_vfs_ioctl+0x430/0x6f8
>>> [ 86.540536] [<0000001ede3c5124>] ksys_ioctl+0x84/0xb0
>>> [ 86.540537] [<0000001ede3c51ba>] __s390x_sys_ioctl+0x2a/0x38
>>> [ 86.540538] [<0000001edeb27f72>] system_call+0x2a6/0x2c8
>>> [ 86.540570] unexpected descriptor format for RX: out 0, in 0
>>> [ 86.540577] Unexpected header len for TX: 0 expected 0
>>>
>>>
>>> On 14.02.20 08:06, Eugenio Pérez wrote:
>>>> Hi Christian.
>>>>
>>>> Sorry, that was meant to be applied over previous debug patch.
>>>>
>>>> Here I inline the one meant to be applied over eccb852f1fe6bede630e2e4f1a121a81e34354ab.
>>>>
>>>> Thanks!
>>>>
>>>> From d978ace99e4844b49b794d768385db3d128a4cc0 Mon Sep 17 00:00:00 2001
>>>> From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@xxxxxxxxxx>
>>>> Date: Fri, 14 Feb 2020 08:02:26 +0100
>>>> Subject: [PATCH] vhost: disable all features and trace last_avail_idx and
>>>> ioctl calls
>>>>
>>>> ---
>>>> drivers/vhost/net.c | 20 +++++++++++++++++---
>>>> drivers/vhost/vhost.c | 25 +++++++++++++++++++++++--
>>>> drivers/vhost/vhost.h | 10 +++++-----
>>>> 3 files changed, 45 insertions(+), 10 deletions(-)
>>>>
>>>> diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
>>>> index e158159671fa..e4d5f843f9c0 100644
>>>> --- a/drivers/vhost/net.c
>>>> +++ b/drivers/vhost/net.c
>>>> @@ -1505,10 +1505,13 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
>>>>
>>>> mutex_lock(&n->dev.mutex);
>>>> r = vhost_dev_check_owner(&n->dev);
>>>> - if (r)
>>>> + if (r) {
>>>> + pr_debug("vhost_dev_check_owner index=%u fd=%d rc r=%d", index, fd, r);
>>>> goto err;
>>>> + }
>>>>
>>>> if (index >= VHOST_NET_VQ_MAX) {
>>>> + pr_debug("vhost_dev_check_owner index=%u fd=%d MAX=%d", index, fd, VHOST_NET_VQ_MAX);
>>>> r = -ENOBUFS;
>>>> goto err;
>>>> }
>>>> @@ -1518,22 +1521,26 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
>>>>
>>>> /* Verify that ring has been setup correctly. */
>>>> if (!vhost_vq_access_ok(vq)) {
>>>> + pr_debug("vhost_net_set_backend index=%u fd=%d !vhost_vq_access_ok", index, fd);
>>>> r = -EFAULT;
>>>> goto err_vq;
>>>> }
>>>> sock = get_socket(fd);
>>>> if (IS_ERR(sock)) {
>>>> r = PTR_ERR(sock);
>>>> + pr_debug("vhost_net_set_backend index=%u fd=%d get_socket err r=%d", index, fd, r);
>>>> goto err_vq;
>>>> }
>>>>
>>>> /* start polling new socket */
>>>> oldsock = vq->private_data;
>>>> if (sock != oldsock) {
>>>> + pr_debug("sock=%p != oldsock=%p index=%u fd=%d vq=%p", sock, oldsock, index, fd, vq);
>>>> ubufs = vhost_net_ubuf_alloc(vq,
>>>> sock && vhost_sock_zcopy(sock));
>>>> if (IS_ERR(ubufs)) {
>>>> r = PTR_ERR(ubufs);
>>>> + pr_debug("ubufs index=%u fd=%d err r=%d vq=%p", index, fd, r, vq);
>>>> goto err_ubufs;
>>>> }
>>>>
>>>> @@ -1541,11 +1548,15 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
>>>> vq->private_data = sock;
>>>> vhost_net_buf_unproduce(nvq);
>>>> r = vhost_vq_init_access(vq);
>>>> - if (r)
>>>> + if (r) {
>>>> + pr_debug("init_access index=%u fd=%d r=%d vq=%p", index, fd, r, vq);
>>>> goto err_used;
>>>> + }
>>>> r = vhost_net_enable_vq(n, vq);
>>>> - if (r)
>>>> + if (r) {
>>>> + pr_debug("enable_vq index=%u fd=%d r=%d vq=%p", index, fd, r, vq);
>>>> goto err_used;
>>>> + }
>>>> if (index == VHOST_NET_VQ_RX)
>>>> nvq->rx_ring = get_tap_ptr_ring(fd);
>>>>
>>>> @@ -1559,6 +1570,8 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
>>>>
>>>> mutex_unlock(&vq->mutex);
>>>>
>>>> + pr_debug("sock=%p", sock);
>>>> +
>>>> if (oldubufs) {
>>>> vhost_net_ubuf_put_wait_and_free(oldubufs);
>>>> mutex_lock(&vq->mutex);
>>>> @@ -1710,6 +1723,7 @@ static long vhost_net_ioctl(struct file *f, unsigned int ioctl,
>>>>
>>>> switch (ioctl) {
>>>> case VHOST_NET_SET_BACKEND:
>>>> + pr_debug("VHOST_NET_SET_BACKEND");
>>>> if (copy_from_user(&backend, argp, sizeof backend))
>>>> return -EFAULT;
>>>> return vhost_net_set_backend(n, backend.index, backend.fd);
>>>> diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
>>>> index b5a51b1f2e79..ec25ba32fe81 100644
>>>> --- a/drivers/vhost/vhost.c
>>>> +++ b/drivers/vhost/vhost.c
>>>> @@ -1642,15 +1642,30 @@ long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *arg
>>>> r = -EINVAL;
>>>> break;
>>>> }
>>>> +
>>>> + if (vq->last_avail_idx || vq->avail_idx) {
>>>> + pr_debug(
>>>> + "strange VHOST_SET_VRING_BASE [vq=%p][s.index=%u][s.num=%u]",
>>>> + vq, s.index, s.num);
>>>> + dump_stack();
>>>> + r = 0;
>>>> + break;
>>>> + }
>>>> vq->last_avail_idx = s.num;
>>>> /* Forget the cached index value. */
>>>> vq->avail_idx = vq->last_avail_idx;
>>>> + pr_debug(
>>>> + "VHOST_SET_VRING_BASE [vq=%p][vq->last_avail_idx=%u][vq->avail_idx=%u][s.index=%u][s.num=%u]",
>>>> + vq, vq->last_avail_idx, vq->avail_idx, s.index, s.num);
>>>> break;
>>>> case VHOST_GET_VRING_BASE:
>>>> s.index = idx;
>>>> s.num = vq->last_avail_idx;
>>>> if (copy_to_user(argp, &s, sizeof s))
>>>> r = -EFAULT;
>>>> + pr_debug(
>>>> + "VHOST_GET_VRING_BASE [vq=%p][vq->last_avail_idx=%u][vq->avail_idx=%u][s.index=%u][s.num=%u]",
>>>> + vq, vq->last_avail_idx, vq->avail_idx, s.index, s.num);
>>>> break;
>>>> case VHOST_SET_VRING_KICK:
>>>> if (copy_from_user(&f, argp, sizeof f)) {
>>>> @@ -2239,8 +2254,8 @@ static int fetch_buf(struct vhost_virtqueue *vq)
>>>> vq->avail_idx = vhost16_to_cpu(vq, avail_idx);
>>>>
>>>> if (unlikely((u16)(vq->avail_idx - last_avail_idx) > vq->num)) {
>>>> - vq_err(vq, "Guest moved used index from %u to %u",
>>>> - last_avail_idx, vq->avail_idx);
>>>> + vq_err(vq, "Guest moved vq %p used index from %u to %u",
>>>> + vq, last_avail_idx, vq->avail_idx);
>>>> return -EFAULT;
>>>> }
>>>>
>>>> @@ -2316,6 +2331,9 @@ static int fetch_buf(struct vhost_virtqueue *vq)
>>>> BUG_ON(!(vq->used_flags & VRING_USED_F_NO_NOTIFY));
>>>>
>>>> /* On success, increment avail index. */
>>>> + pr_debug(
>>>> + "[vq=%p][vq->last_avail_idx=%u][vq->avail_idx=%u][vq->ndescs=%d][vq->first_desc=%d]",
>>>> + vq, vq->last_avail_idx, vq->avail_idx, vq->ndescs, vq->first_desc);
>>>> vq->last_avail_idx++;
>>>>
>>>> return 0;
>>>> @@ -2432,6 +2450,9 @@ EXPORT_SYMBOL_GPL(vhost_get_vq_desc);
>>>> /* Reverse the effect of vhost_get_vq_desc. Useful for error handling. */
>>>> void vhost_discard_vq_desc(struct vhost_virtqueue *vq, int n)
>>>> {
>>>> + pr_debug(
>>>> + "DISCARD [vq=%p][vq->last_avail_idx=%u][vq->avail_idx=%u][n=%d]",
>>>> + vq, vq->last_avail_idx, vq->avail_idx, n);
>>>> vq->last_avail_idx -= n;
>>>> }
>>>> EXPORT_SYMBOL_GPL(vhost_discard_vq_desc);
>>>> diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
>>>> index 661088ae6dc7..08f6d2ccb697 100644
>>>> --- a/drivers/vhost/vhost.h
>>>> +++ b/drivers/vhost/vhost.h
>>>> @@ -250,11 +250,11 @@ int vhost_init_device_iotlb(struct vhost_dev *d, bool enabled);
>>>> } while (0)
>>>>
>>>> enum {
>>>> - VHOST_FEATURES = (1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) |
>>>> - (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
>>>> - (1ULL << VIRTIO_RING_F_EVENT_IDX) |
>>>> - (1ULL << VHOST_F_LOG_ALL) |
>>>> - (1ULL << VIRTIO_F_ANY_LAYOUT) |
>>>> + VHOST_FEATURES = /* (1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | */
>>>> + /* (1ULL << VIRTIO_RING_F_INDIRECT_DESC) | */
>>>> + /* (1ULL << VIRTIO_RING_F_EVENT_IDX) | */
>>>> + /* (1ULL << VHOST_F_LOG_ALL) | */
>>>> + /* (1ULL << VIRTIO_F_ANY_LAYOUT) | */
>>>> (1ULL << VIRTIO_F_VERSION_1)
>>>> };
>>>>
>>>>
>>>
>>
[ 924.337135] [1901] 1666: VHOST_GET_VRING_BASE [vq=0000000063d896c6][vq->last_avail_idx=109][vq->avail_idx=0][s.index=1][s.num=109]
[ 937.802750] [2237] 1657: VHOST_SET_VRING_BASE [vq=00000000742665e9][vq->last_avail_idx=0][vq->avail_idx=0][s.index=0][s.num=0]
[ 937.802757] [2237] 1657: VHOST_SET_VRING_BASE [vq=000000007d36f807][vq->last_avail_idx=0][vq->avail_idx=0][s.index=1][s.num=0]
[ 937.802763] [2237] 1726: VHOST_NET_SET_BACKEND
[ 937.802766] [2237] 1538: sock=00000000de4d87a3 != oldsock=0000000012e3bc88 index=0 fd=39 vq=00000000742665e9
[ 937.802770] [2237] 1573: sock=00000000de4d87a3
[ 937.802771] [2237] 1726: VHOST_NET_SET_BACKEND
[ 937.802772] [2237] 1538: sock=00000000de4d87a3 != oldsock=0000000012e3bc88 index=1 fd=39 vq=000000007d36f807
[ 937.802773] [2237] 1573: sock=00000000de4d87a3
[ 937.802775] [2235] 2453: DISCARD [vq=00000000742665e9][vq->last_avail_idx=0][vq->avail_idx=0][n=0]
[ 938.475541] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=0][vq->avail_idx=256][vq->ndescs=1][vq->first_desc=0]
[ 938.475543] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=1][vq->avail_idx=256][vq->ndescs=2][vq->first_desc=0]
[ 938.475544] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=2][vq->avail_idx=256][vq->ndescs=3][vq->first_desc=0]
[ 938.475545] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=3][vq->avail_idx=256][vq->ndescs=4][vq->first_desc=0]
[ 938.475546] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=4][vq->avail_idx=256][vq->ndescs=5][vq->first_desc=0]
[ 938.475547] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=5][vq->avail_idx=256][vq->ndescs=6][vq->first_desc=0]
[ 938.475548] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=6][vq->avail_idx=256][vq->ndescs=7][vq->first_desc=0]
[ 938.475549] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=7][vq->avail_idx=256][vq->ndescs=8][vq->first_desc=0]
[ 938.475550] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=8][vq->avail_idx=256][vq->ndescs=9][vq->first_desc=0]
[ 938.475551] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=9][vq->avail_idx=256][vq->ndescs=10][vq->first_desc=0]
[ 938.475552] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=10][vq->avail_idx=256][vq->ndescs=11][vq->first_desc=0]
[ 938.475553] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=11][vq->avail_idx=256][vq->ndescs=12][vq->first_desc=0]
[ 938.475554] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=12][vq->avail_idx=256][vq->ndescs=13][vq->first_desc=0]
[ 938.475555] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=13][vq->avail_idx=256][vq->ndescs=14][vq->first_desc=0]
[ 938.475556] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=14][vq->avail_idx=256][vq->ndescs=15][vq->first_desc=0]
[ 938.475557] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=15][vq->avail_idx=256][vq->ndescs=16][vq->first_desc=0]
[ 938.475558] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=16][vq->avail_idx=256][vq->ndescs=17][vq->first_desc=0]
[ 938.475559] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=17][vq->avail_idx=256][vq->ndescs=18][vq->first_desc=0]
[ 938.475560] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=18][vq->avail_idx=256][vq->ndescs=19][vq->first_desc=0]
[ 938.475561] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=19][vq->avail_idx=256][vq->ndescs=20][vq->first_desc=0]
[ 938.475562] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=20][vq->avail_idx=256][vq->ndescs=21][vq->first_desc=0]
[ 938.475563] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=21][vq->avail_idx=256][vq->ndescs=22][vq->first_desc=0]
[ 938.475564] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=22][vq->avail_idx=256][vq->ndescs=23][vq->first_desc=0]
[ 938.475564] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=23][vq->avail_idx=256][vq->ndescs=24][vq->first_desc=0]
[ 938.475565] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=24][vq->avail_idx=256][vq->ndescs=25][vq->first_desc=0]
[ 938.475566] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=25][vq->avail_idx=256][vq->ndescs=26][vq->first_desc=0]
[ 938.475567] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=26][vq->avail_idx=256][vq->ndescs=27][vq->first_desc=0]
[ 938.475568] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=27][vq->avail_idx=256][vq->ndescs=28][vq->first_desc=0]
[ 938.475569] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=28][vq->avail_idx=256][vq->ndescs=29][vq->first_desc=0]
[ 938.475570] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=29][vq->avail_idx=256][vq->ndescs=30][vq->first_desc=0]
[ 938.475571] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=30][vq->avail_idx=256][vq->ndescs=31][vq->first_desc=0]
[ 938.475572] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=31][vq->avail_idx=256][vq->ndescs=32][vq->first_desc=0]
[ 938.475573] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=32][vq->avail_idx=256][vq->ndescs=33][vq->first_desc=0]
[ 938.475574] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=33][vq->avail_idx=256][vq->ndescs=34][vq->first_desc=0]
[ 938.475575] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=34][vq->avail_idx=256][vq->ndescs=35][vq->first_desc=0]
[ 938.475576] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=35][vq->avail_idx=256][vq->ndescs=36][vq->first_desc=0]
[ 938.475577] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=36][vq->avail_idx=256][vq->ndescs=37][vq->first_desc=0]
[ 938.475577] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=37][vq->avail_idx=256][vq->ndescs=38][vq->first_desc=0]
[ 938.475578] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=38][vq->avail_idx=256][vq->ndescs=39][vq->first_desc=0]
[ 938.475579] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=39][vq->avail_idx=256][vq->ndescs=40][vq->first_desc=0]
[ 938.475580] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=40][vq->avail_idx=256][vq->ndescs=41][vq->first_desc=0]
[ 938.475581] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=41][vq->avail_idx=256][vq->ndescs=42][vq->first_desc=0]
[ 938.475582] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=42][vq->avail_idx=256][vq->ndescs=43][vq->first_desc=0]
[ 938.475583] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=43][vq->avail_idx=256][vq->ndescs=44][vq->first_desc=0]
[ 938.475584] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=44][vq->avail_idx=256][vq->ndescs=45][vq->first_desc=0]
[ 938.475585] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=45][vq->avail_idx=256][vq->ndescs=46][vq->first_desc=0]
[ 938.475586] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=46][vq->avail_idx=256][vq->ndescs=47][vq->first_desc=0]
[ 938.475587] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=47][vq->avail_idx=256][vq->ndescs=48][vq->first_desc=0]
[ 938.475588] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=48][vq->avail_idx=256][vq->ndescs=49][vq->first_desc=0]
[ 938.475589] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=49][vq->avail_idx=256][vq->ndescs=50][vq->first_desc=0]
[ 938.475589] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=50][vq->avail_idx=256][vq->ndescs=51][vq->first_desc=0]
[ 938.475590] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=51][vq->avail_idx=256][vq->ndescs=52][vq->first_desc=0]
[ 938.475591] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=52][vq->avail_idx=256][vq->ndescs=53][vq->first_desc=0]
[ 938.475592] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=53][vq->avail_idx=256][vq->ndescs=54][vq->first_desc=0]
[ 938.475593] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=54][vq->avail_idx=256][vq->ndescs=55][vq->first_desc=0]
[ 938.475594] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=55][vq->avail_idx=256][vq->ndescs=56][vq->first_desc=0]
[ 938.475595] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=56][vq->avail_idx=256][vq->ndescs=57][vq->first_desc=0]
[ 938.475596] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=57][vq->avail_idx=256][vq->ndescs=58][vq->first_desc=0]
[ 938.475597] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=58][vq->avail_idx=256][vq->ndescs=59][vq->first_desc=0]
[ 938.475598] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=59][vq->avail_idx=256][vq->ndescs=60][vq->first_desc=0]
[ 938.475599] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=60][vq->avail_idx=256][vq->ndescs=61][vq->first_desc=0]
[ 938.475600] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=61][vq->avail_idx=256][vq->ndescs=62][vq->first_desc=0]
[ 938.475601] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=62][vq->avail_idx=256][vq->ndescs=63][vq->first_desc=0]
[ 938.475601] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=63][vq->avail_idx=256][vq->ndescs=64][vq->first_desc=0]
[ 938.475603] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=64][vq->avail_idx=256][vq->ndescs=65][vq->first_desc=0]
[ 938.591320] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=0][vq->avail_idx=1][vq->ndescs=1][vq->first_desc=0]
[ 938.607139] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=1][vq->avail_idx=2][vq->ndescs=1][vq->first_desc=0]
[ 938.607538] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=2][vq->avail_idx=4][vq->ndescs=1][vq->first_desc=0]
[ 938.607540] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=3][vq->avail_idx=4][vq->ndescs=2][vq->first_desc=0]
[ 938.616010] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=4][vq->avail_idx=5][vq->ndescs=1][vq->first_desc=0]
[ 938.796034] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=5][vq->avail_idx=6][vq->ndescs=1][vq->first_desc=0]
[ 938.811243] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=6][vq->avail_idx=7][vq->ndescs=2][vq->first_desc=0]
[ 938.905985] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=7][vq->avail_idx=8][vq->ndescs=1][vq->first_desc=0]
[ 939.011405] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=8][vq->avail_idx=9][vq->ndescs=2][vq->first_desc=0]
[ 939.212298] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=9][vq->avail_idx=10][vq->ndescs=2][vq->first_desc=0]
[ 939.413649] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=10][vq->avail_idx=11][vq->ndescs=2][vq->first_desc=0]
[ 939.596036] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=11][vq->avail_idx=12][vq->ndescs=1][vq->first_desc=0]
[ 939.996031] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=12][vq->avail_idx=13][vq->ndescs=1][vq->first_desc=0]
[ 940.591371] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=13][vq->avail_idx=14][vq->ndescs=1][vq->first_desc=0]
[ 940.636040] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=14][vq->avail_idx=15][vq->ndescs=1][vq->first_desc=0]
[ 940.665984] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=15][vq->avail_idx=16][vq->ndescs=1][vq->first_desc=0]
[ 940.865048] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=16][vq->avail_idx=17][vq->ndescs=2][vq->first_desc=0]
[ 941.067594] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=17][vq->avail_idx=18][vq->ndescs=2][vq->first_desc=0]
[ 941.126013] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=18][vq->avail_idx=19][vq->ndescs=1][vq->first_desc=0]
[ 941.273297] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=19][vq->avail_idx=20][vq->ndescs=2][vq->first_desc=0]
[ 941.294416] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=20][vq->avail_idx=21][vq->ndescs=1][vq->first_desc=0]
[ 941.476486] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=21][vq->avail_idx=22][vq->ndescs=2][vq->first_desc=0]
[ 941.516034] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=22][vq->avail_idx=23][vq->ndescs=1][vq->first_desc=0]
[ 941.651361] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=23][vq->avail_idx=24][vq->ndescs=1][vq->first_desc=0]
[ 941.651942] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=24][vq->avail_idx=25][vq->ndescs=1][vq->first_desc=0]
[ 941.652190] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=25][vq->avail_idx=26][vq->ndescs=1][vq->first_desc=0]
[ 941.652363] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=26][vq->avail_idx=27][vq->ndescs=1][vq->first_desc=0]
[ 941.652542] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=27][vq->avail_idx=28][vq->ndescs=1][vq->first_desc=0]
[ 941.652715] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=28][vq->avail_idx=29][vq->ndescs=1][vq->first_desc=0]
[ 941.652882] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=29][vq->avail_idx=30][vq->ndescs=1][vq->first_desc=0]
[ 941.653050] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=30][vq->avail_idx=31][vq->ndescs=1][vq->first_desc=0]
[ 941.653218] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=31][vq->avail_idx=32][vq->ndescs=1][vq->first_desc=0]
[ 941.653388] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=32][vq->avail_idx=33][vq->ndescs=1][vq->first_desc=0]
[ 941.653558] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=33][vq->avail_idx=34][vq->ndescs=1][vq->first_desc=0]
[ 941.653725] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=34][vq->avail_idx=35][vq->ndescs=1][vq->first_desc=0]
[ 941.653896] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=35][vq->avail_idx=36][vq->ndescs=1][vq->first_desc=0]
[ 941.654063] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=36][vq->avail_idx=37][vq->ndescs=1][vq->first_desc=0]
[ 941.654229] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=37][vq->avail_idx=38][vq->ndescs=1][vq->first_desc=0]
[ 941.654398] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=38][vq->avail_idx=39][vq->ndescs=1][vq->first_desc=0]
[ 941.654567] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=39][vq->avail_idx=40][vq->ndescs=1][vq->first_desc=0]
[ 941.654738] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=40][vq->avail_idx=41][vq->ndescs=1][vq->first_desc=0]
[ 941.654906] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=41][vq->avail_idx=42][vq->ndescs=1][vq->first_desc=0]
[ 941.655070] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=42][vq->avail_idx=43][vq->ndescs=1][vq->first_desc=0]
[ 941.655240] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=43][vq->avail_idx=44][vq->ndescs=1][vq->first_desc=0]
[ 943.627121] [2235] 2334: [vq=000000007d36f807][vq->last_avail_idx=44][vq->avail_idx=45][vq->ndescs=1][vq->first_desc=0]
[ 945.158600] [2228] 1726: VHOST_NET_SET_BACKEND
[ 945.158603] [2228] 1538: sock=0000000012e3bc88 != oldsock=00000000de4d87a3 index=0 fd=-1 vq=00000000742665e9
[ 945.158604] [2228] 1573: sock=0000000012e3bc88
[ 945.158622] [2228] 1726: VHOST_NET_SET_BACKEND
[ 945.158623] [2228] 1538: sock=0000000012e3bc88 != oldsock=00000000de4d87a3 index=1 fd=-1 vq=000000007d36f807
[ 945.158624] [2228] 1573: sock=0000000012e3bc88
[ 945.158646] [2228] 1666: VHOST_GET_VRING_BASE [vq=00000000742665e9][vq->last_avail_idx=65][vq->avail_idx=256][s.index=0][s.num=65]
[ 945.158648] [2228] 1666: VHOST_GET_VRING_BASE [vq=000000007d36f807][vq->last_avail_idx=45][vq->avail_idx=45][s.index=1][s.num=45]
[ 947.678597] [2237] 1647: strange VHOST_SET_VRING_BASE [vq=00000000742665e9][s.index=0][s.num=0]
[ 947.678600] CPU: 22 PID: 2237 Comm: CPU 0/KVM Not tainted 5.5.0+ #21
[ 947.678604] Hardware name: IBM 3906 M04 704 (LPAR)
[ 947.678606] Call Trace:
[ 947.678612] [<0000001ede114132>] show_stack+0x8a/0xd0
[ 947.678615] [<0000001edeb0672a>] dump_stack+0x8a/0xb8
[ 947.678625] [<000003ff803736a6>] vhost_vring_ioctl+0x6fe/0x858 [vhost]
[ 947.678628] [<000003ff8042a608>] vhost_net_ioctl+0x510/0x570 [vhost_net]
[ 947.678632] [<0000001ede3c4dd8>] do_vfs_ioctl+0x430/0x6f8
[ 947.678634] [<0000001ede3c5124>] ksys_ioctl+0x84/0xb0
[ 947.678635] [<0000001ede3c51ba>] __s390x_sys_ioctl+0x2a/0x38
[ 947.678638] [<0000001edeb27f72>] system_call+0x2a6/0x2c8
[ 947.678660] [2237] 1647: strange VHOST_SET_VRING_BASE [vq=000000007d36f807][s.index=1][s.num=0]
[ 947.678661] CPU: 22 PID: 2237 Comm: CPU 0/KVM Not tainted 5.5.0+ #21
[ 947.678662] Hardware name: IBM 3906 M04 704 (LPAR)
[ 947.678662] Call Trace:
[ 947.678664] [<0000001ede114132>] show_stack+0x8a/0xd0
[ 947.678665] [<0000001edeb0672a>] dump_stack+0x8a/0xb8
[ 947.678667] [<000003ff803736a6>] vhost_vring_ioctl+0x6fe/0x858 [vhost]
[ 947.678669] [<000003ff8042a608>] vhost_net_ioctl+0x510/0x570 [vhost_net]
[ 947.678671] [<0000001ede3c4dd8>] do_vfs_ioctl+0x430/0x6f8
[ 947.678672] [<0000001ede3c5124>] ksys_ioctl+0x84/0xb0
[ 947.678673] [<0000001ede3c51ba>] __s390x_sys_ioctl+0x2a/0x38
[ 947.678675] [<0000001edeb27f72>] system_call+0x2a6/0x2c8
[ 947.678694] [2237] 1726: VHOST_NET_SET_BACKEND
[ 947.678697] [2237] 1538: sock=00000000de4d87a3 != oldsock=0000000012e3bc88 index=0 fd=39 vq=00000000742665e9
[ 947.678702] [2237] 1573: sock=00000000de4d87a3
[ 947.678703] [2237] 1726: VHOST_NET_SET_BACKEND
[ 947.678704] [2237] 1538: sock=00000000de4d87a3 != oldsock=0000000012e3bc88 index=1 fd=39 vq=000000007d36f807
[ 947.678705] [2237] 1573: sock=00000000de4d87a3
[ 947.678717] Guest moved vq 000000007d36f807 used index from 45 to 0
[ 950.562666] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=65][vq->avail_idx=256][vq->ndescs=1][vq->first_desc=0]
[ 950.562671] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=66][vq->avail_idx=256][vq->ndescs=2][vq->first_desc=0]
[ 950.562672] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=67][vq->avail_idx=256][vq->ndescs=3][vq->first_desc=0]
[ 950.562673] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=68][vq->avail_idx=256][vq->ndescs=4][vq->first_desc=0]
[ 950.562674] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=69][vq->avail_idx=256][vq->ndescs=5][vq->first_desc=0]
[ 950.562675] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=70][vq->avail_idx=256][vq->ndescs=6][vq->first_desc=0]
[ 950.562676] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=71][vq->avail_idx=256][vq->ndescs=7][vq->first_desc=0]
[ 950.562677] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=72][vq->avail_idx=256][vq->ndescs=8][vq->first_desc=0]
[ 950.562678] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=73][vq->avail_idx=256][vq->ndescs=9][vq->first_desc=0]
[ 950.562679] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=74][vq->avail_idx=256][vq->ndescs=10][vq->first_desc=0]
[ 950.562679] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=75][vq->avail_idx=256][vq->ndescs=11][vq->first_desc=0]
[ 950.562680] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=76][vq->avail_idx=256][vq->ndescs=12][vq->first_desc=0]
[ 950.562681] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=77][vq->avail_idx=256][vq->ndescs=13][vq->first_desc=0]
[ 950.562682] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=78][vq->avail_idx=256][vq->ndescs=14][vq->first_desc=0]
[ 950.562683] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=79][vq->avail_idx=256][vq->ndescs=15][vq->first_desc=0]
[ 950.562684] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=80][vq->avail_idx=256][vq->ndescs=16][vq->first_desc=0]
[ 950.562685] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=81][vq->avail_idx=256][vq->ndescs=17][vq->first_desc=0]
[ 950.562686] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=82][vq->avail_idx=256][vq->ndescs=18][vq->first_desc=0]
[ 950.562687] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=83][vq->avail_idx=256][vq->ndescs=19][vq->first_desc=0]
[ 950.562688] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=84][vq->avail_idx=256][vq->ndescs=20][vq->first_desc=0]
[ 950.562689] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=85][vq->avail_idx=256][vq->ndescs=21][vq->first_desc=0]
[ 950.562690] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=86][vq->avail_idx=256][vq->ndescs=22][vq->first_desc=0]
[ 950.562690] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=87][vq->avail_idx=256][vq->ndescs=23][vq->first_desc=0]
[ 950.562691] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=88][vq->avail_idx=256][vq->ndescs=24][vq->first_desc=0]
[ 950.562692] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=89][vq->avail_idx=256][vq->ndescs=25][vq->first_desc=0]
[ 950.562693] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=90][vq->avail_idx=256][vq->ndescs=26][vq->first_desc=0]
[ 950.562694] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=91][vq->avail_idx=256][vq->ndescs=27][vq->first_desc=0]
[ 950.562695] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=92][vq->avail_idx=256][vq->ndescs=28][vq->first_desc=0]
[ 950.562696] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=93][vq->avail_idx=256][vq->ndescs=29][vq->first_desc=0]
[ 950.562697] [2235] 2334: [vq=00000000742665e9][vq->last_avail_idx=94][vq->avail_idx=256][vq->ndescs=30][vq->first_desc=0]
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