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Date: Fri, 14 Feb 2020 13:34:55 +0100
From: Christian Borntraeger <borntraeger@...ibm.com>
To: Eugenio Pérez <eperezma@...hat.com>
Cc: "Michael S. Tsirkin" <mst@...hat.com>,
"virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>,
Stephen Rothwell <sfr@...b.auug.org.au>,
Linux Next Mailing List <linux-next@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
kvm list <kvm@...r.kernel.org>,
Halil Pasic <pasic@...ux.ibm.com>,
Cornelia Huck <cohuck@...hat.com>
Subject: Re: vhost changes (batched) in linux-next after 12/13 trigger random
crashes in KVM guests after reboot
On 14.02.20 13:26, Eugenio Pérez wrote:
> On Fri, 2020-02-14 at 13:22 +0100, Christian Borntraeger wrote:
>>
>> On 14.02.20 13:17, Eugenio Pérez wrote:
>>> Can you try the inlined patch over 52c36ce7f334 ("vhost: use batched version by default")? My intention is to check
>>> if
>>> "strange VHOST_SET_VRING_BASE" line appears. In previous tests, it appears very fast, but maybe it takes some time
>>> for
>>> it to appear, or it does not appear anymore.
yep it does:
[ 67.801012] [1917] vhost:vhost_vring_ioctl:1655: VHOST_SET_VRING_BASE [vq=0000000088199421][vq->last_avail_idx=0][vq->avail_idx=0][s.index=0][s.num=0]
[ 67.801018] [1917] vhost:vhost_vring_ioctl:1655: VHOST_SET_VRING_BASE [vq=00000000175f11ec][vq->last_avail_idx=0][vq->avail_idx=0][s.index=1][s.num=0]
[ 67.801026] [1917] vhost_net:vhost_net_ioctl:1726: VHOST_NET_SET_BACKEND
[ 67.801028] [1917] vhost_net:vhost_net_set_backend:1538: sock=0000000082d8d291 != oldsock=000000001ae027fd index=0 fd=39 vq=0000000088199421
[ 67.801032] [1917] vhost_net:vhost_net_set_backend:1573: sock=0000000082d8d291
[ 67.801033] [1917] vhost_net:vhost_net_ioctl:1726: VHOST_NET_SET_BACKEND
[ 67.801034] [1917] vhost_net:vhost_net_set_backend:1538: sock=0000000082d8d291 != oldsock=000000001ae027fd index=1 fd=39 vq=00000000175f11ec
[ 67.801035] [1917] vhost_net:vhost_net_set_backend:1573: sock=0000000082d8d291
[ 67.801037] [1915] vhost:vhost_discard_vq_desc:2424: DISCARD [vq=0000000088199421][vq->last_avail_idx=0][vq->avail_idx=0][n=0]
[ 68.648803] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=0][vq->avail_idx=256][vq->ndescs=1]
[ 68.648810] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=1][vq->avail_idx=256][vq->ndescs=1]
[ 68.648812] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=2][vq->avail_idx=256][vq->ndescs=1]
[ 68.648815] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=3][vq->avail_idx=256][vq->ndescs=1]
[ 68.648817] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=4][vq->avail_idx=256][vq->ndescs=1]
[ 68.648818] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=5][vq->avail_idx=256][vq->ndescs=1]
[ 68.648820] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=6][vq->avail_idx=256][vq->ndescs=1]
[ 68.648822] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=7][vq->avail_idx=256][vq->ndescs=1]
[ 68.648824] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=8][vq->avail_idx=256][vq->ndescs=1]
[ 68.648826] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=9][vq->avail_idx=256][vq->ndescs=1]
[ 68.648828] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=10][vq->avail_idx=256][vq->ndescs=1]
[ 68.648829] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=11][vq->avail_idx=256][vq->ndescs=1]
[ 68.648831] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=12][vq->avail_idx=256][vq->ndescs=1]
[ 68.648832] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=13][vq->avail_idx=256][vq->ndescs=1]
[ 68.648833] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=14][vq->avail_idx=256][vq->ndescs=1]
[ 68.670292] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=0][vq->avail_idx=1][vq->ndescs=1]
[ 68.687187] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=1][vq->avail_idx=2][vq->ndescs=1]
[ 68.687623] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=15][vq->avail_idx=256][vq->ndescs=1]
[ 68.687641] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=2][vq->avail_idx=4][vq->ndescs=1]
[ 68.687642] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=3][vq->avail_idx=4][vq->ndescs=1]
[ 68.690274] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=16][vq->avail_idx=256][vq->ndescs=1]
[ 68.690539] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=4][vq->avail_idx=5][vq->ndescs=1]
[ 68.715379] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=17][vq->avail_idx=256][vq->ndescs=1]
[ 68.800525] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=5][vq->avail_idx=6][vq->ndescs=1]
[ 68.890537] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=6][vq->avail_idx=7][vq->ndescs=1]
[ 68.900587] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=7][vq->avail_idx=8][vq->ndescs=1]
[ 68.916837] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=8][vq->avail_idx=9][vq->ndescs=2]
[ 68.928828] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=18][vq->avail_idx=256][vq->ndescs=1]
[ 69.090540] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=9][vq->avail_idx=10][vq->ndescs=1]
[ 69.119651] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=10][vq->avail_idx=11][vq->ndescs=2]
[ 69.132325] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=19][vq->avail_idx=256][vq->ndescs=1]
[ 69.323473] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=11][vq->avail_idx=12][vq->ndescs=2]
[ 69.354557] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=20][vq->avail_idx=256][vq->ndescs=1]
[ 69.442550] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=21][vq->avail_idx=256][vq->ndescs=1]
[ 69.523593] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=12][vq->avail_idx=13][vq->ndescs=2]
[ 69.557360] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=22][vq->avail_idx=256][vq->ndescs=1]
[ 69.980634] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=13][vq->avail_idx=14][vq->ndescs=1]
[ 69.981364] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=14][vq->avail_idx=15][vq->ndescs=1]
[ 70.010545] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=15][vq->avail_idx=16][vq->ndescs=1]
[ 70.161316] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=23][vq->avail_idx=256][vq->ndescs=1]
[ 70.177640] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=24][vq->avail_idx=256][vq->ndescs=1]
[ 70.280564] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=16][vq->avail_idx=17][vq->ndescs=1]
[ 70.670327] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=17][vq->avail_idx=18][vq->ndescs=1]
[ 70.932887] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=18][vq->avail_idx=19][vq->ndescs=2]
[ 70.940587] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=19][vq->avail_idx=20][vq->ndescs=1]
[ 70.947598] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=25][vq->avail_idx=256][vq->ndescs=1]
[ 71.070388] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=20][vq->avail_idx=21][vq->ndescs=1]
[ 71.070770] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=26][vq->avail_idx=256][vq->ndescs=1]
[ 71.070805] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=21][vq->avail_idx=22][vq->ndescs=1]
[ 71.070977] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=27][vq->avail_idx=256][vq->ndescs=1]
[ 71.071049] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=22][vq->avail_idx=23][vq->ndescs=1]
[ 71.071195] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=28][vq->avail_idx=256][vq->ndescs=1]
[ 71.071243] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=23][vq->avail_idx=24][vq->ndescs=1]
[ 71.071386] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=29][vq->avail_idx=256][vq->ndescs=1]
[ 71.071433] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=24][vq->avail_idx=25][vq->ndescs=1]
[ 71.071575] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=30][vq->avail_idx=256][vq->ndescs=1]
[ 71.071611] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=25][vq->avail_idx=26][vq->ndescs=1]
[ 71.071747] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=31][vq->avail_idx=256][vq->ndescs=1]
[ 71.071789] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=26][vq->avail_idx=27][vq->ndescs=1]
[ 71.071923] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=32][vq->avail_idx=256][vq->ndescs=1]
[ 71.071960] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=27][vq->avail_idx=28][vq->ndescs=1]
[ 71.072096] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=33][vq->avail_idx=256][vq->ndescs=1]
[ 71.072128] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=28][vq->avail_idx=29][vq->ndescs=1]
[ 71.072267] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=34][vq->avail_idx=256][vq->ndescs=1]
[ 71.072300] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=29][vq->avail_idx=30][vq->ndescs=1]
[ 71.072432] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=35][vq->avail_idx=256][vq->ndescs=1]
[ 71.072463] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=30][vq->avail_idx=31][vq->ndescs=1]
[ 71.072596] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=36][vq->avail_idx=256][vq->ndescs=1]
[ 71.072630] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=31][vq->avail_idx=32][vq->ndescs=1]
[ 71.072759] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=37][vq->avail_idx=256][vq->ndescs=1]
[ 71.072791] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=32][vq->avail_idx=33][vq->ndescs=1]
[ 71.072933] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=38][vq->avail_idx=256][vq->ndescs=1]
[ 71.073054] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=33][vq->avail_idx=34][vq->ndescs=1]
[ 71.073193] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=39][vq->avail_idx=256][vq->ndescs=1]
[ 71.073247] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=34][vq->avail_idx=35][vq->ndescs=1]
[ 71.073383] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=40][vq->avail_idx=256][vq->ndescs=1]
[ 71.073434] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=35][vq->avail_idx=36][vq->ndescs=1]
[ 71.073571] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=41][vq->avail_idx=256][vq->ndescs=1]
[ 71.073627] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=36][vq->avail_idx=37][vq->ndescs=1]
[ 71.073762] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=42][vq->avail_idx=256][vq->ndescs=1]
[ 71.073813] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=37][vq->avail_idx=38][vq->ndescs=1]
[ 71.073948] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=43][vq->avail_idx=256][vq->ndescs=1]
[ 71.073998] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=38][vq->avail_idx=39][vq->ndescs=1]
[ 71.074136] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=44][vq->avail_idx=256][vq->ndescs=1]
[ 71.074186] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=39][vq->avail_idx=40][vq->ndescs=1]
[ 71.074320] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=45][vq->avail_idx=256][vq->ndescs=1]
[ 71.074370] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=40][vq->avail_idx=41][vq->ndescs=1]
[ 71.074503] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=46][vq->avail_idx=256][vq->ndescs=1]
[ 72.344493] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=47][vq->avail_idx=256][vq->ndescs=1]
[ 72.553413] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=48][vq->avail_idx=256][vq->ndescs=1]
[ 73.522174] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=49][vq->avail_idx=256][vq->ndescs=1]
[ 73.705202] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=50][vq->avail_idx=256][vq->ndescs=1]
[ 73.705239] [1915] vhost:fetch_descs:2328: [vq=00000000175f11ec][vq->last_avail_idx=41][vq->avail_idx=42][vq->ndescs=1]
[ 73.994388] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=51][vq->avail_idx=256][vq->ndescs=1]
[ 74.208443] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=52][vq->avail_idx=256][vq->ndescs=1]
[ 74.433345] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=53][vq->avail_idx=256][vq->ndescs=1]
[ 74.594756] [1910] vhost_net:vhost_net_ioctl:1726: VHOST_NET_SET_BACKEND
[ 74.594761] [1910] vhost_net:vhost_net_set_backend:1538: sock=000000001ae027fd != oldsock=0000000082d8d291 index=0 fd=-1 vq=0000000088199421
[ 74.594762] [1910] vhost_net:vhost_net_set_backend:1573: sock=000000001ae027fd
[ 74.594803] [1910] vhost_net:vhost_net_ioctl:1726: VHOST_NET_SET_BACKEND
[ 74.594804] [1910] vhost_net:vhost_net_set_backend:1538: sock=000000001ae027fd != oldsock=0000000082d8d291 index=1 fd=-1 vq=00000000175f11ec
[ 74.594805] [1910] vhost_net:vhost_net_set_backend:1573: sock=000000001ae027fd
[ 74.594847] [1910] vhost:vhost_vring_ioctl:1664: VHOST_GET_VRING_BASE [vq=0000000088199421][vq->last_avail_idx=54][vq->avail_idx=256][s.index=0][s.num=54]
[ 74.594850] [1910] vhost:vhost_vring_ioctl:1664: VHOST_GET_VRING_BASE [vq=00000000175f11ec][vq->last_avail_idx=42][vq->avail_idx=42][s.index=1][s.num=42]
[ 77.003191] [1918] vhost:vhost_vring_ioctl:1645: strange VHOST_SET_VRING_BASE [vq=0000000088199421][s.index=0][s.num=0]
[ 77.003194] CPU: 62 PID: 1918 Comm: CPU 1/KVM Not tainted 5.5.0+ #22
[ 77.003197] Hardware name: IBM 3906 M04 704 (LPAR)
[ 77.003198] Call Trace:
[ 77.003207] [<0000000b8d93c132>] show_stack+0x8a/0xd0
[ 77.003211] [<0000000b8e32e72a>] dump_stack+0x8a/0xb8
[ 77.003224] [<000003ff803567ae>] vhost_vring_ioctl+0x6fe/0x858 [vhost]
[ 77.003228] [<000003ff8036c670>] vhost_net_ioctl+0x510/0x570 [vhost_net]
[ 77.003234] [<0000000b8dbecdd8>] do_vfs_ioctl+0x430/0x6f8
[ 77.003235] [<0000000b8dbed124>] ksys_ioctl+0x84/0xb0
[ 77.003237] [<0000000b8dbed1ba>] __s390x_sys_ioctl+0x2a/0x38
[ 77.003240] [<0000000b8e34ff72>] system_call+0x2a6/0x2c8
[ 77.003261] [1918] vhost:vhost_vring_ioctl:1645: strange VHOST_SET_VRING_BASE [vq=00000000175f11ec][s.index=1][s.num=0]
[ 77.003262] CPU: 62 PID: 1918 Comm: CPU 1/KVM Not tainted 5.5.0+ #22
[ 77.003263] Hardware name: IBM 3906 M04 704 (LPAR)
[ 77.003264] Call Trace:
[ 77.003266] [<0000000b8d93c132>] show_stack+0x8a/0xd0
[ 77.003267] [<0000000b8e32e72a>] dump_stack+0x8a/0xb8
[ 77.003270] [<000003ff803567ae>] vhost_vring_ioctl+0x6fe/0x858 [vhost]
[ 77.003271] [<000003ff8036c670>] vhost_net_ioctl+0x510/0x570 [vhost_net]
[ 77.003273] [<0000000b8dbecdd8>] do_vfs_ioctl+0x430/0x6f8
[ 77.003274] [<0000000b8dbed124>] ksys_ioctl+0x84/0xb0
[ 77.003276] [<0000000b8dbed1ba>] __s390x_sys_ioctl+0x2a/0x38
[ 77.003277] [<0000000b8e34ff72>] system_call+0x2a6/0x2c8
[ 77.003297] [1918] vhost_net:vhost_net_ioctl:1726: VHOST_NET_SET_BACKEND
[ 77.003300] [1918] vhost_net:vhost_net_set_backend:1538: sock=0000000082d8d291 != oldsock=000000001ae027fd index=0 fd=39 vq=0000000088199421
[ 77.003304] [1918] vhost_net:vhost_net_set_backend:1573: sock=0000000082d8d291
[ 77.003305] [1918] vhost_net:vhost_net_ioctl:1726: VHOST_NET_SET_BACKEND
[ 77.003306] [1918] vhost_net:vhost_net_set_backend:1538: sock=0000000082d8d291 != oldsock=000000001ae027fd index=1 fd=39 vq=00000000175f11ec
[ 77.003308] [1915] vhost:fetch_descs:2328: [vq=0000000088199421][vq->last_avail_idx=54][vq->avail_idx=256][vq->ndescs=1]
[ 77.003308] [1918] vhost_net:vhost_net_set_backend:1573: sock=0000000082d8d291
[ 77.003310] [1915] vhost_net:get_rx_bufs:1061: unexpected descriptor format for RX: out 0, in 0
[ 77.003312] [1915] vhost:vhost_discard_vq_desc:2424: DISCARD [vq=0000000088199421][vq->last_avail_idx=55][vq->avail_idx=256][n=0]
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