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Re: Random crash during guest start on x86
- To: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
- Date: Mon, 25 Jul 2022 16:03:04 +0000
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: Random crash during guest start on x86
On 25/07/2022 16:51, Bertrand Marquis wrote:
> Hi,
>
> On our CI we have randomly a crash during guest boot on x86.
>
> We are running on qemu x86_64 using Xen staging.
> The crash is happening randomly (something like 1 out of 20 times).
>
> This is always happening on the first guest we start, we never got it after
> first guest was successfully started.
>
> Please tell me if you need any other info.
>
> Here is the guest kernel log:
> <snip>
> [ 0.000000] Hypervisor detected: Xen PV
> <snip>
> [ 6.679020] general protection fault, maybe for address 0x8800: 0000 [#1]
> PREEMPT SMP NOPTI
> [ 6.679020] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.17.6 #1
> [ 6.679020] RIP: e030:error_entry+0xaf/0xe0
> [ 6.679020] Code: 29 89 c8 48 39 84 24 88 00 00 00 74 15 48 81 bc 24 88 00
> 00 00 63 10 e0 81 75 03 0f 01 f8 90 90 90 c3 48 89 8c 24 88 00 00 00 <0f> 01
> f8 90 90 90 eb 11 0f 20 d8 90 90 90 90 90 48 25 ff e7 ff ff
> [ 6.679020] RSP: e02b:ffffffff82803a90 EFLAGS: 00000046
> [ 6.679020] RAX: 0000000000008800 RBX: 0000000000000000 RCX:
> ffffffff81e00fa7
> [ 6.679020] RDX: 0000000000000000 RSI: ffffffff81e009f8 RDI:
> 00000000000000eb
> [ 6.679020] RBP: 0000000000000000 R08: 0000000000000000 R09:
> 0000000000000000
> [ 6.679020] R10: 0000000000000000 R11: 0000000000000000 R12:
> 0000000000000000
> [ 6.679020] R13: 0000000000000000 R14: 0000000000000000 R15:
> 0000000000000000
> [ 6.679020] FS: 0000000000000000(0000) GS:ffff88801f200000(0000)
> knlGS:0000000000000000
> [ 6.679020] CS: 10000e030 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 6.679020] CR2: 0000000000000000 CR3: 000000000280c000 CR4:
> 0000000000050660
> [ 6.679020] Call Trace:
> [ 6.679020] <TASK>
>
0f 01 f8 is SWAPGS
This is a privileged instruction, and has never been permitted under Xen
PV. This should have been excluded by pvops.
This is a Linux bug, not a Xen bug.
I can't explain why you're only seeing it intermittently. Perhaps
error_entry is broken by default, and pvops fixes things up, but an
error early enough takes a non-fixed-up path :-/
~Andrew
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