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Re: [Qemu-devel] qemu-kvm-1.0.1 - unable to exit if vcpu is in infinite
From: |
Avi Kivity |
Subject: |
Re: [Qemu-devel] qemu-kvm-1.0.1 - unable to exit if vcpu is in infinite loop |
Date: |
Sun, 19 Aug 2012 12:42:54 +0300 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20120717 Thunderbird/14.0 |
On 08/17/2012 06:04 PM, Jan Kiszka wrote:
>
>>> Can anyone imagine that such a barrier may actually be required? If it
>>> is currently possible that env->stop is evaluated before we called into
>>> sigtimedwait in qemu_kvm_eat_signals, then we could actually eat the
>>> signal without properly processing its reason (stop).
>
> Should not be required (TM): Both signal eating / stop checking and stop
> setting / signal generation happens under the BQL, thus the ordering
> must not make a difference here.
Agree.
> Don't see where we could lose a signal. Maybe due to a subtle memory
> corruption that sets thread_kicked to non-zero, preventing the kicking
> this way.
Cannot be ruled out, yet too much of a coincidence.
Could be a kernel bug (either in kvm or elsewhere), we've had several
before in this area.
Is this reproducible?
--
error compiling committee.c: too many arguments to function
- Re: [Qemu-devel] qemu-kvm-1.0.1 - unable to exit if vcpu is in infinite loop, Stefan Hajnoczi, 2012/08/06
- Re: [Qemu-devel] qemu-kvm-1.0.1 - unable to exit if vcpu is in infinite loop, Jan Kiszka, 2012/08/17
- Re: [Qemu-devel] qemu-kvm-1.0.1 - unable to exit if vcpu is in infinite loop, Jan Kiszka, 2012/08/17
- Re: [Qemu-devel] qemu-kvm-1.0.1 - unable to exit if vcpu is in infinite loop, Jan Kiszka, 2012/08/17
- Re: [Qemu-devel] qemu-kvm-1.0.1 - unable to exit if vcpu is in infinite loop, Jan Kiszka, 2012/08/17
- Re: [Qemu-devel] qemu-kvm-1.0.1 - unable to exit if vcpu is in infinite loop,
Avi Kivity <=
- Re: [Qemu-devel] qemu-kvm-1.0.1 - unable to exit if vcpu is in infinite loop, Jan Kiszka, 2012/08/21
- Re: [Qemu-devel] qemu-kvm-1.0.1 - unable to exit if vcpu is in infinite loop, Stefan Hajnoczi, 2012/08/21
- Re: [Qemu-devel] qemu-kvm-1.0.1 - unable to exit if vcpu is in infinite loop, Peter Lieven, 2012/08/22