[dpdk-users] Segfault while running on older CPU

[Filip Janiszewski]

Il 14/02/19 15:46, Van Haaren, Harry ha scritto:
>> -----Original Message-----
>> From: users [mailto:users-bounces at dpdk.org] On Behalf Of Filip Janiszewski
>> Sent: Thursday, February 14, 2019 2:15 PM
>> To: Wiles, Keith <keith.wiles at intel.com>
>> Cc: users at dpdk.org
>> Subject: Re: [dpdk-users] Segfault while running on older CPU
>>
>> Hi,
>>
>> I prepared a simple test application with only a call to rte_eal_init
>> and it crashes, DPDK version is 18.05 and apparently the problem is with
>> the BMI2 instruction set, the faulty line is:
>>
>> .
>>  │0x57fec9 <rte_cpu_get_flag_enabled+89>  shrx   %eax,%edx,%eax
>> .
>>
>> I'm attempting to disable those instructions by setting march to corei7
>> which according to gcc does not include BMI2, but still when opening the
>> asm list of the binary can see that instruction.
>>
>> If I understand correctly how the DPDK building process works then I
>> should be able to set this 'corei7' switch by just changing
>> mk/machine/default/rte.vars.mk and then setting
>> CONFIG_RTE_MACHINE="default" in the x86_64-native-linuxapp-gcc/.config
>> file, but I'm not sure whether it's picking it up while building (make
>> T=x86_64-native-linuxapp-gcc DESTDIR=. -j28).
> 
> 
> Possibly related crashing bugs;
> 
> DPDK rte memcpy / binutils 2.30:
> https://bugs.dpdk.org/show_bug.cgi?id=97#c48
> 
> Gcc bug report;
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88096
> And a related/duplicate: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86735
> 
> 
> Please check if you're using binutils 2.30, and if so try latest DPDK code which has
> merged a fix for disabling certain features as a workaround.
> 

I'm running version 2.27, will try to upgrade to the latest DPDK code
and check if things are getting fixed.

> As Keith mentioned, what OS / Distro / Release, and what version of gcc / binutils is in use?
> 

OS CentOS 7.5.1804 with 3.10.0-862.14.4.el7.x86_64, gcc 4.8.5 (20150623)
and binutils 2.27.

Thanks.

> 
> Regards, -Harry
> 
> 
> <snip previous discussion>
> 

-- 
BR, Filip
+48 666 369 823