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Message-ID: <20220815124748-mutt-send-email-mst@kernel.org>
Date: Mon, 15 Aug 2022 12:50:52 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Andres Freund <andres@...razel.de>
Cc: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
Jason Wang <jasowang@...hat.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
Linus Torvalds <torvalds@...ux-foundation.org>,
Jens Axboe <axboe@...nel.dk>,
James Bottomley <James.Bottomley@...senpartnership.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Guenter Roeck <linux@...ck-us.net>,
linux-kernel@...r.kernel.org, Greg KH <gregkh@...uxfoundation.org>,
c@...hat.com
Subject: Re: upstream kernel crashes
On Mon, Aug 15, 2022 at 09:45:03AM -0700, Andres Freund wrote:
> Hi,
>
> On 2022-08-15 11:40:59 -0400, Michael S. Tsirkin wrote:
> > OK so this gives us a quick revert as a solution for now.
> > Next, I would appreciate it if you just try this simple hack.
> > If it crashes we either have a long standing problem in virtio
> > code or more likely a gcp bug where it can't handle smaller
> > rings than what device requestes.
> > Thanks!
>
> I applied the below and the problem persists.
>
> > diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
> > index f7965c5dd36b..bdd5f481570b 100644
> > --- a/drivers/virtio/virtio_pci_modern.c
> > +++ b/drivers/virtio/virtio_pci_modern.c
> > @@ -314,6 +314,9 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
> > if (!size || size > num)
> > size = num;
> >
> > + if (size > 1024)
> > + size = 1024;
> > +
> > if (size & (size - 1)) {
> > dev_warn(&vp_dev->pci_dev->dev, "bad queue size %u", size);
> > return ERR_PTR(-EINVAL);
> >
> >
>
> [ 1.165162] virtio_net virtio1 enp0s4: renamed from eth0
> [ 1.177815] general protection fault, probably for non-canonical address 0xffff000000000400: 0000 [#1] PREEMPT SMP PTI
> [ 1.179565] CPU: 1 PID: 125 Comm: systemd-udevd Not tainted 6.0.0-rc1-bisect14-dirty #14
> [ 1.180785] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
> [ 1.182475] RIP: 0010:__kmalloc_node_track_caller+0x19e/0x380
> [ 1.183365] Code: 2b 04 25 28 00 00 00 0f 85 f8 01 00 00 48 83 c4 18 48 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 8b 4d 28 48 8b 7d 00 <48> 8b 1c 08 48 8d 4a 40 65 48 0f c7 0f 0f 94 c0 84 c0 0f 84 0b ff
> [ 1.186208] RSP: 0018:ffff9c470021b860 EFLAGS: 00010246
> [ 1.187194] RAX: ffff000000000000 RBX: 00000000000928c0 RCX: 0000000000000400
> [ 1.188634] RDX: 0000000000005781 RSI: 00000000000928c0 RDI: 000000000002e0f0
> [ 1.190177] RBP: ffff908380042c00 R08: 0000000000000600 R09: ffff908380b665e4
> [ 1.191256] R10: 0000000000000003 R11: 0000000000000002 R12: 00000000000928c0
> [ 1.192269] R13: 0000000000000740 R14: 00000000ffffffff R15: 0000000000000000
> [ 1.193368] FS: 00007f746702a8c0(0000) GS:ffff9084b7d00000(0000) knlGS:0000000000000000
> [ 1.194846] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 1.195661] CR2: 00007ffc010df980 CR3: 0000000103826005 CR4: 00000000003706e0
> [ 1.196912] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 1.198216] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 1.199367] Call Trace:
> [ 1.199815] <TASK>
> [ 1.200138] ? netlink_trim+0x85/0xb0
> [ 1.200754] pskb_expand_head+0x92/0x340
> [ 1.202512] netlink_trim+0x85/0xb0
> [ 1.203069] netlink_unicast+0x54/0x390
> [ 1.203630] rtnl_getlink+0x366/0x410
> [ 1.204155] ? __d_alloc+0x24/0x1d0
> [ 1.204668] rtnetlink_rcv_msg+0x146/0x3b0
> [ 1.205256] ? _raw_spin_unlock+0xd/0x30
> [ 1.205867] ? __d_add+0xf2/0x1b0
> [ 1.206600] ? rtnl_calcit.isra.0+0x130/0x130
> [ 1.207221] netlink_rcv_skb+0x49/0xf0
> [ 1.207904] netlink_unicast+0x23a/0x390
> [ 1.208585] netlink_sendmsg+0x23b/0x4b0
> [ 1.209203] sock_sendmsg+0x57/0x60
> [ 1.210118] __sys_sendto+0x117/0x170
> [ 1.210694] ? __wake_up_common_lock+0x83/0xc0
> [ 1.211420] __x64_sys_sendto+0x1b/0x30
> [ 1.211992] do_syscall_64+0x37/0x90
> [ 1.212497] entry_SYSCALL_64_after_hwframe+0x63/0xcd
> [ 1.213407] RIP: 0033:0x7f74677404e6
> [ 1.213973] Code: 69 0e 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 11 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 72 c3 90 41 54 48 83 ec 30 44 89 4c 24 2c 4c
> [ 1.217098] RSP: 002b:00007ffc010daa78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
> [ 1.219539] RAX: ffffffffffffffda RBX: 000000000011bc98 RCX: 00007f74677404e6
> [ 1.220552] RDX: 0000000000000020 RSI: 0000563160679570 RDI: 0000000000000005
> [ 1.222378] RBP: 00005631606796b0 R08: 00007ffc010daaf0 R09: 0000000000000080
> [ 1.223692] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
> [ 1.224793] R13: 0000000000000000 R14: 0000000000000000 R15: 00005631606794b0
> [ 1.226228] </TASK>
> [ 1.226775] Modules linked in:
> [ 1.227414] ---[ end trace 0000000000000000 ]---
>
> Greetings,
>
> Andres Freund
Okay! And just to be 100% sure, can you try the following on top of 5.19:
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index 623906b4996c..6f4e54a618bc 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -208,6 +208,9 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
return ERR_PTR(-EINVAL);
}
+ if (num > 1024)
+ num = 1024;
+
info->msix_vector = msix_vec;
/* create the vring */
--
MST
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