[pve-devel] qemu start hanging on dell r710

[Alexandre DERUMIER]

I'm currently debug it with paolo from qemu.

I have a workaround for qemu if needed (don't known where proxmox 4.0 will be released).


----- Mail original -----
De: "aderumier" <aderumier at odiso.com>
À: "Wolfgang Bumiller" <w.bumiller at proxmox.com>
Cc: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Mardi 29 Septembre 2015 14:05:55
Objet: Re: [pve-devel] qemu start hanging on dell r710

ok, thanks wolfgang ! 

----- Mail original ----- 
De: "Wolfgang Bumiller" <w.bumiller at proxmox.com> 
À: "aderumier" <aderumier at odiso.com>, "pve-devel" <pve-devel at pve.proxmox.com> 
Envoyé: Mardi 29 Septembre 2015 13:53:40 
Objet: Re: [pve-devel] qemu start hanging on dell r710 

> On September 29, 2015 at 12:35 PM Alexandre DERUMIER <aderumier at odiso.com> 
> wrote: 
> 
> Can someone tell me how to debug with qemu dbg package ? 

AFAIK it just contains unstripped binaries, so you can use 'gdb' to debug it. 
(You might have to run /usr/lib/debug/usr/bin/kvm (or qemu-*) instead of the 
regular binary, but I don't think that's necessary, I'm not sure though right 
now...) 

To see the source line contents in backtraces the source files have to be 
available. 
(You can add a path to the source tree with the `dir` command from within qemu 
if 
you've built the package in a temporary location and deleted the files already. 
Note that the files must be exactly the same you compiled from otherwise the 
output 
will just be wrong.) 

It'll only allow you to debug the qemu related parts though, eg. if the VM dies 
of an 
error inside the guest itself (kernel segfault or whatever), then that's not 
actually 
an error in the host qemu process, so you won't get the chance to do a backtrace 
if the guest kernel segfaults because qemu then exits successfully... 

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