Re: raw disks no longer work in latest kvm (kvm-88 was fine)

[Antoine Martin <antoine@nagafix.co.uk>]

On 03/08/2010 02:10 AM, Avi Kivity wrote:
> On 03/07/2010 09:07 PM, Antoine Martin wrote:
>>>>> Antoine, can you check this?  ltrace may help,
>>>> This the only part that looked slightly relevant:
>>>> [pid 26883] __xstat64(1, "./vm/media_fs", 0x7fff92e40500) = 0
>>>> [pid 26883] malloc(48)                           = 0x2a38d60
>>>> [pid 26883] memset(0x2a38d60, '\000', 48)        = 0x2a38d60
>>>> [pid 26883] open64("./vm/media_fs", 540674, 00)  = 12
>>>> [pid 26883] posix_memalign(0x7fff92e40560, 512, 16384, -1, 48) = 0
>>>> [pid 26883] lseek64(12, 0, 2, 0x7f404f2f3e60, 4) = 0x133c4820600
>>>
>>>
>>> Where's pread/preadv?  Did you use -f?
>>
>> Yes I did.
>> ltrace -f bash ./vm/start.sh >& trace.log
>
> Well, some variant of pread should have shown up.  Maybe it's the 
> ltrace -f race.
FYI: qemu booted fully under strace, but not under ltrace...

>>>>> or run 'strings libc.so | grep pread'.
>>>>>
>>>> strings /lib/libc.so.6 | grep pread
>>>> preadv
>>>> preadv64
>>>> pread
>>>> __pread64_chk
>>>> __pread64
>>>> __pread_chk
>>>>
>>>
>>> So it does seem glibc emulates preadv.
>>>
>>> Perhaps https://bugzilla.redhat.com/show_bug.cgi?id=563103 ?
>> This a gentoo box... but yes, this does look similar doesn't it?
>
> What version of glibc do you have installed?
Latest stable:
sys-devel/gcc-4.3.4
sys-libs/glibc-2.10.1-r1