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[Qemu-devel] KVM freeze when using --serial
From: |
Thomas Kittel |
Subject: |
[Qemu-devel] KVM freeze when using --serial |
Date: |
Wed, 07 Apr 2010 16:32:33 +0200 |
User-agent: |
Mozilla-Thunderbird 2.0.0.22 (X11/20090707) |
Hi there,
I already posted this problem to #kvm on freenode.
Please set me in CC: when replying to this mail, as I am not subscribed
to this mailing lists right now.
The Scenario is as follows:
I got 2 VM processes in userspace.
The first is started with the parameter --monitor pty.
=> This results in a file /dev/pts/x in the host,
(crw--w---- 1 kittel tty 136, 3 2010-04-07 15:51 /dev/pts/3 on
my system)
Another VM is then started with the parameter --serial /dev/pts/3
=> This results in /dev/ttyS0 inside the second VM.
Both VMs are running debian lenny. The host (debian) uses qemu-kvm 0.12.3.
"startvms.sh start" is used to start the VMs.
Running the executable build from test.c in the second VM results in a
freeze of this VM.
(The test.c included uses /dev/ttyS1 as /dev/ttyS0 is the VMs serial
console in my setup.)
The process uses 100% CPU and is stuck in kvm_mutex_lock().
Trying to use the build in gdbserver didnĀ“t work because it also locked.
Is there a way to tunnel one VMs monitor console to another VM?
Thanks Thomas
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <signal.h>
#include <pthread.h>
void signal_handler(int signum){
pthread_exit(NULL);
}
void *readFile(void * ptr){
signal(SIGTERM, signal_handler);
int fd;
char buffer;
fd = open("/dev/ttyS1", O_RDONLY);
while(true){
read(fd, &buffer, 1);
printf("%c", buffer);
fflush(stdout);
}
close(fd);
pthread_exit(NULL);
}
int main(int argc, char** argv){
pthread_t thread;
pthread_create(&thread, NULL, &readFile, NULL);
sleep(10);
pthread_kill(thread, SIGTERM);
pthread_join(thread, NULL);
}
startvms.sh
Description: Bourne shell script
- [Qemu-devel] KVM freeze when using --serial,
Thomas Kittel <=