Hi Stefan,
Am 11.02.2013 10:40, schrieb Stefan Hajnoczi:
> On Mon, Feb 11, 2013 at 08:46:03AM +0100, Stefan Priebe - Profihost AG wrote:
>> i've seen segfaults of the kvm process. Sadly i've no core dumps just
>> the line from dmesg:
>> kvm[26268]: segfault at c050 ip 00007fcfc3465eac sp 00007fffe85a0d00
>> error 4 in kvm[7fcfc3223000+3ba000]
>>
>> Is it possible to get the function and some more details out of this
>> line? I've symbol files and debugging files of the kvm binary.
>
> Accessed address: c050
> Address of the instruction that segfaulted: 00007fcfc3465eac
> Base memory address where kvm code was mmapped: 7fcfc3223000
> Length of mmap: 3ba000
>
> Try the following:
>
> $ printf '%x' $((0x7fcfc3465eac - 0x7fcfc3223000))
> 242eac
> $ addr2line -e path/to/qemu-kvm-symbols -f 242eac
>
> I also suggest posting about 10 lines before/after 0x242eac from the
> objdump -d path/to/kvm output. That way we can sanity check that the
> instruction accesses memory and see what the surrounding instructions
> are doing.
Great thing! This is current git master.
[: ~]# addr2line -e /usr/lib/debug/usr/bin/kvm -f 242eac
virtio_scsi_command_complete
/opt/debianpackages/pve-squeeze.sources/pve-qemu-kvm/qemu-kvm/hw/virtio-scsi.c:429
static void virtio_scsi_command_complete(SCSIRequest *r, uint32_t status,
size_t resid)
{
VirtIOSCSIReq *req = r->hba_private;
uint32_t sense_len;
=====> THIS IS 429 req->resp.cmd->response = VIRTIO_SCSI_S_OK;
req->resp.cmd->status = status;
if (req->resp.cmd->status == GOOD) {
req->resp.cmd->resid = tswap32(resid);
} else {
req->resp.cmd->resid = 0;
sense_len = scsi_req_get_sense(r, req->resp.cmd->sense,
VIRTIO_SCSI_SENSE_SIZE);
req->resp.cmd->sense_len = tswap32(sense_len);
}
virtio_scsi_complete_req(req);
}
Greets,
Stefan
