un essai de récupérer des infos avec gdb sur le process de la kvm plantée :
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root@proxmox:~# gdb
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(gdb) attach 9565
Attaching to process 9565
[New LWP 9566]
[New LWP 9599]
[New LWP 9600]
[New LWP 9601]
[New LWP 9602]
[New LWP 9604]
[New LWP 9605]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007fef4fe57771 in __GI_ppoll (fds=0x7feefb6d6a00, nfds=13, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
39 ../sysdeps/unix/sysv/linux/ppoll.c: No such file or directory.
(gdb) info threads
Id Target Id Frame
* 1 Thread 0x7fef68287fc0 (LWP 9565) "kvm" 0x00007fef4fe57771 in __GI_ppoll (fds=0x7feefb6d6a00, nfds=13, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
2 Thread 0x7fef443ff700 (LWP 9566) "kvm" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
3 Thread 0x7fef433fd700 (LWP 9599) "kvm" 0x00007fef4fe58e07 in ioctl () at ../sysdeps/unix/syscall-template.S:84
4 Thread 0x7fef423ff700 (LWP 9600) "kvm" 0x00007fef4fe58e07 in ioctl () at ../sysdeps/unix/syscall-template.S:84
5 Thread 0x7fef413ff700 (LWP 9601) "kvm" 0x00007fef4fe58e07 in ioctl () at ../sysdeps/unix/syscall-template.S:84
6 Thread 0x7fef403ff700 (LWP 9602) "kvm" 0x00007fef4fe58e07 in ioctl () at ../sysdeps/unix/syscall-template.S:84
7 Thread 0x7feefb3ff700 (LWP 9604) "kvm" 0x00007fef4fe576ad in poll () at ../sysdeps/unix/syscall-template.S:84
8 Thread 0x7feef97ff700 (LWP 9605) "kvm" pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
(gdb)
ca me parle pas ... et je me demande si c'est gdb qui plante ou qui m'indique un plantage

je vois des personnes parler d'un backtrace pour investiguer sur un crash...
Ma VM s'est arrêtée toute seule suite aux tests que je lui soumettais , donc pour l'instant c'est reparti tout frais. Je retente au prochain plantage...