Hi Jan,
On Wed, Feb 23, 2011 at 11:47 PM, Jan Kiszka <jan.kiszka@xxxxxxxxxxx> wrote:
> On 2011-02-23 15:38, Ryousei Takano wrote:
>> This reverts commit c65827770b5e7282b5fb9da29c1de85ed08e816e
>
> Reasoning would belong here, not below the separator.
>
>>
>> Signed-off-by: Ryousei Takano <takano-ryousei@xxxxxxxxxx>
>> ---
>> I am trying to run OpenMP (i.e., multi-threaded) programs using Intel
>> Math Kernel Library (MKL) on a guest OS. In the qemu-kvm-0.12.5,
>> my program works fine. In the qemu-kvm-0.13.0, however, it does not.
>
> What about 0.14?
>
0.14-rc1 also has problem.
>> The Linux kernel is 2.6.32.28. The outputs of 'ps -L' are shown as follows:
>>
>> qemu-kvm-0.12.5:
>> PID LWP TTY TIME CMD
>> 2731 2731 pts/0 00:00:00 bash
>> 2799 2799 pts/0 00:00:19 a.out
>> 2799 2803 pts/0 00:00:00 a.out
>> 2799 2804 pts/0 00:00:04 a.out <-
>> 2799 2805 pts/0 00:00:03 a.out <- these threads are working properly.
>> 2799 2806 pts/0 00:00:04 a.out <-
>> 2807 2807 pts/0 00:00:00 ps
>>
>> qemu-0.13.0:
>> PID LWP TTY TIME CMD
>> 2725 2725 pts/0 00:00:00 bash
>> 2748 2748 pts/0 00:00:19 a.out
>> 2748 2752 pts/0 00:00:00 a.out
>> 2748 2753 pts/0 00:00:00 a.out <-
>> 2748 2754 pts/0 00:00:00 a.out <- these threads are blocked by
>> pthread_cond_wait(3).
>> 2748 2755 pts/0 00:00:00 a.out <-
>> 2756 2756 pts/0 00:00:00 ps
>>
>> This problem seems to be introduced by the commit
>> c65827770b5e7282b5fb9da29c1de85ed08e816e.
>> The attached revert patch solves it. But I do not understand what is
>> happened;-)
>> Any comments and suggestions will be appreciated.
>>
>> Regards,
>> Ryousei
>>
>> hw/pc.c | 6 ++++++
>> target-i386/helper.c | 2 --
>> 2 files changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/hw/pc.c b/hw/pc.c
>> index ec97181..577abe7 100644
>> --- a/hw/pc.c
>> +++ b/hw/pc.c
>> @@ -937,6 +937,12 @@ CPUState *pc_new_cpu(const char *cpu_model)
>> }
>> qemu_register_reset(pc_cpu_reset, env);
>> pc_cpu_reset(env);
>> +
>> + /* kvm needs this to run after the apic is initialized. Otherwise,
>> + * it can access invalid state and crash.
>> + */
>> + qemu_init_vcpu(env);
>> +
>> return env;
>> }
>>
>> diff --git a/target-i386/helper.c b/target-i386/helper.c
>> index 86202e6..69cda5e 100644
>> --- a/target-i386/helper.c
>> +++ b/target-i386/helper.c
>> @@ -1224,8 +1224,6 @@ CPUX86State *cpu_x86_init(const char *cpu_model)
>> }
>> mce_init(env);
>>
>> - qemu_init_vcpu(env);
>> -
>> return env;
>> }
>>
>
> I don't believe yet that the patch is the reason, specifically as it
> targets the setup phase (except for CPU hotplug, but that's broken for
> ages), not the operational phase of the VM.
>
> What's your qemu-kvm command line?
>
Here is my command line.
sudo qemu-system-x86_64 \
-cpu host \
-smp 8 \
-m 46080 \
-net nic,model=virtio,macaddr=00:16:3e:1d:ff:00 \
-net tap,ifname=tap0,script=no,downscript=no \
-monitor telnet::5963,server,nowait \
-daemonize \
disk.img
> Also, please attach gdb to the stuck VM and print the backtraces of all
> threads ("thread apply all bt").
>
(gdb) thread apply all bt
Thread 9 (Thread 0x41129940 (LWP 8118)):
#0 0x0000003dd38cc647 in ioctl () from /lib64/libc.so.6
#1 0x000000000042e56d in pthread_attr_setdetachstate ()
#2 0x000000000042ea99 in pthread_attr_setdetachstate ()
#3 0x000000000042ecf0 in pthread_attr_setdetachstate ()
#4 0x0000003dd400673d in start_thread () from /lib64/libpthread.so.0
#5 0x0000003dd38d3d1d in clone () from /lib64/libc.so.6
Thread 8 (Thread 0x41ca8940 (LWP 8119)):
#0 0x0000003dd38cc647 in ioctl () from /lib64/libc.so.6
#1 0x000000000042e56d in pthread_attr_setdetachstate ()
#2 0x000000000042ea99 in pthread_attr_setdetachstate ()
#3 0x000000000042ecf0 in pthread_attr_setdetachstate ()
#4 0x0000003dd400673d in start_thread () from /lib64/libpthread.so.0
#5 0x0000003dd38d3d1d in clone () from /lib64/libc.so.6
Thread 7 (Thread 0x425f2940 (LWP 8120)):
#0 0x0000003dd38cc647 in ioctl () from /lib64/libc.so.6
#1 0x000000000042e56d in pthread_attr_setdetachstate ()
#2 0x000000000042ea99 in pthread_attr_setdetachstate ()
#3 0x000000000042ecf0 in pthread_attr_setdetachstate ()
#4 0x0000003dd400673d in start_thread () from /lib64/libpthread.so.0
#5 0x0000003dd38d3d1d in clone () from /lib64/libc.so.6
Thread 6 (Thread 0x42df3940 (LWP 8121)):
#0 0x0000003dd38cc647 in ioctl () from /lib64/libc.so.6
#1 0x000000000042e56d in pthread_attr_setdetachstate ()
#2 0x000000000042ea99 in pthread_attr_setdetachstate ()
#3 0x000000000042ecf0 in pthread_attr_setdetachstate ()
#4 0x0000003dd400673d in start_thread () from /lib64/libpthread.so.0
#5 0x0000003dd38d3d1d in clone () from /lib64/libc.so.6
Thread 5 (Thread 0x435f4940 (LWP 8122)):
#0 0x0000003dd38cc647 in ioctl () from /lib64/libc.so.6
#1 0x000000000042e56d in pthread_attr_setdetachstate ()
#2 0x000000000042ea99 in pthread_attr_setdetachstate ()
#3 0x000000000042ecf0 in pthread_attr_setdetachstate ()
#4 0x0000003dd400673d in start_thread () from /lib64/libpthread.so.0
#5 0x0000003dd38d3d1d in clone () from /lib64/libc.so.6
Thread 4 (Thread 0x43df5940 (LWP 8123)):
#0 0x0000003dd38cc647 in ioctl () from /lib64/libc.so.6
#1 0x000000000042e56d in pthread_attr_setdetachstate ()
#2 0x000000000042ea99 in pthread_attr_setdetachstate ()
#3 0x000000000042ecf0 in pthread_attr_setdetachstate ()
#4 0x0000003dd400673d in start_thread () from /lib64/libpthread.so.0
#5 0x0000003dd38d3d1d in clone () from /lib64/libc.so.6
Thread 3 (Thread 0x445f6940 (LWP 8124)):
#0 0x0000003dd38cc647 in ioctl () from /lib64/libc.so.6
#1 0x000000000042e56d in pthread_attr_setdetachstate ()
#2 0x000000000042ea99 in pthread_attr_setdetachstate ()
#3 0x000000000042ecf0 in pthread_attr_setdetachstate ()
#4 0x0000003dd400673d in start_thread () from /lib64/libpthread.so.0
#5 0x0000003dd38d3d1d in clone () from /lib64/libc.so.6
Thread 2 (Thread 0x44df7940 (LWP 8125)):
#0 0x0000003dd38cc647 in ioctl () from /lib64/libc.so.6
#1 0x000000000042e56d in pthread_attr_setdetachstate ()
#2 0x000000000042ea99 in pthread_attr_setdetachstate ()
#3 0x000000000042ecf0 in pthread_attr_setdetachstate ()
#4 0x0000003dd400673d in start_thread () from /lib64/libpthread.so.0
#5 0x0000003dd38d3d1d in clone () from /lib64/libc.so.6
Thread 1 (Thread 0x7fe796ec1740 (LWP 8117)):
#0 0x0000003dd38ccfc2 in select () from /lib64/libc.so.6
#1 0x0000000000419620 in pthread_attr_setdetachstate ()
#2 0x000000000042be07 in pthread_attr_setdetachstate ()
#3 0x000000000041ae20 in pthread_attr_setdetachstate ()
#4 0x0000003dd381d994 in __libc_start_main () from /lib64/libc.so.6
#5 0x00000000004063d9 in pthread_attr_setdetachstate ()
#6 0x00007fff8050c988 in ?? ()
#7 0x0000000000000000 in ?? ()
Regards,
Ryousei
> Thanks,
> Jan
>
> --
> Siemens AG, Corporate Technology, CT T DE IT 1
> Corporate Competence Center Embedded Linux
>
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