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Re: [Qemu-devel] [PATCH uq/master] kvmclock: Ensure proper env->tsc valu
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH uq/master] kvmclock: Ensure proper env->tsc value for kvmclock_current_nsec calculation |
Date: |
Tue, 15 Jul 2014 22:43:39 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 |
Il 15/07/2014 22:31, Marcelo Tosatti ha scritto:
> This patch (or some form of updating env->tsc, see changelog)
> is necessary.
Yes, I was going to revert Alex's too.
> I was just about to reproduce it.
>
> Andrey, can you please provide the qemu command line ?
>
> Can you attempt to start VM via command line and migrate
> via QEMU monitor, then gdb -p to get a backtrace for all
> threads ?
Andrey provided backtraces for this issue here:
http://article.gmane.org/gmane.comp.emulators.qemu/286679
The first backtrace attached is bt-noreset.txt, the second is bt-reset.txt
but they are identical. The backtraces lack symbols for QEMU, but it looks
like the VMs are running because the CPU threads all look like this:
Thread 4 (Thread 0x7f0054ff9700 (LWP 2915)):
#0 0x00007f00a04dbc37 in ioctl () at ../sysdeps/unix/syscall-template.S:82
#1 0x00007f00a59ea0a9 in ?? ()
#2 0x00007f00a59ea1e5 in ?? ()
#3 0x00007f00a59d59bc in ?? ()
#4 0x00007f00a07b5e9a in start_thread (arg=0x7f0054ff9700) at
pthread_create.c:308
#5 0x00007f00a04e33dd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6 0x0000000000000000 in ?? ()
where the ioctl is likely KVM_RUN.
Paolo
- Re: [Qemu-devel] [PATCH uq/master] kvmclock: Ensure proper env->tsc value for kvmclock_current_nsec calculation, Paolo Bonzini, 2014/07/15
- Re: [Qemu-devel] [PATCH uq/master] kvmclock: Ensure proper env->tsc value for kvmclock_current_nsec calculation, Marcin GibuĊa, 2014/07/15
- Re: [Qemu-devel] [PATCH uq/master] kvmclock: Ensure proper env->tsc value for kvmclock_current_nsec calculation, Paolo Bonzini, 2014/07/15
- Re: [Qemu-devel] [PATCH uq/master] kvmclock: Ensure proper env->tsc value for kvmclock_current_nsec calculation, Marcelo Tosatti, 2014/07/15
- Re: [Qemu-devel] [PATCH uq/master] kvmclock: Ensure proper env->tsc value for kvmclock_current_nsec calculation, Marcelo Tosatti, 2014/07/15
- Re: [Qemu-devel] [PATCH uq/master] kvmclock: Ensure proper env->tsc value for kvmclock_current_nsec calculation, Paolo Bonzini, 2014/07/15
- Re: [Qemu-devel] [PATCH uq/master] kvmclock: Ensure proper env->tsc value for kvmclock_current_nsec calculation, Andrey Korolyov, 2014/07/15
- Re: [Qemu-devel] [PATCH uq/master] kvmclock: Ensure proper env->tsc value for kvmclock_current_nsec calculation, Paolo Bonzini, 2014/07/15
- Re: [Qemu-devel] [PATCH uq/master] kvmclock: Ensure proper env->tsc value for kvmclock_current_nsec calculation,
Paolo Bonzini <=