[CRIU] [PATCH] arch, x86: int80 -- Clobber all rX registers

[Pavel Tikhomirov]

On 1/15/19 5:08 PM, Cyrill Gorcunov wrote:
> On Tue, Jan 15, 2019 at 02:06:30PM +0000, Dmitry Safonov wrote:
>>
>> Some more details would be appreciated.
>> What kind of kernels is it about?
>> Is there a redhat patch that changes this ABI?
>> Worth a reference?
>>
>> It's not that I'm against - probably performance penalty on
>> mainstream from pushing a couple of registers more on the stack
>> apriori syscalls is small(?), but the commit message could
>> be improved.
> 
> Pasha has to apply it, so it is vz kernel I think. Pasha?
> 

I saw these problem running criu-dev zdtm on VZ7 kernel (it was year ago 
so it's hard to find exact version), it showed up as:

========================== Run zdtm/static/env00 in h 
==========================
Start test
./env00 --pidfile=env00.pid --outfile=env00.out --envname=ENV_00_TEST
Run criu dump
=[log]=> dump/zdtm/static/env00/36/1/dump.log
------------------------ grep Error ------------------------
(00.006926) Obtaining personality ...
(00.006953) Sent msg to daemon 64 0 0
(00.006966) Wait for ack 64 on daemon socket
pie: 36: __fetched msg: 64 0 0
(00.007040) Error (criu/parasite-syscall.c:92): si_code=4 si_pid=36 
si_status=11
(00.007052) Error (criu/parasite-syscall.c:100): 36 was stopped by 11 
unexpectedly
------------------------ ERROR OVER ------------------------
################### Test zdtm/static/env00 FAIL at CRIU dump 
###################

And these patch applied on top of criu-dev unblocked the test.

Will try to run without these patch to check if it is still relevant.

-- 
Best regards, Tikhomirov Pavel
Software Developer, Virtuozzo.