Re: [LTP] [Patch] Fix mtest06 failure: caught unexpected signal - 11 --- exiting

[Subrata Modak <subrata@linux.vnet.ibm.com>]

Suzuki,

Can you please review this patch ?

Regards--
Subrata

-------- Forwarded Message --------
From: Garrett Cooper <yanegomi@gmail.com>
To: renxiu liang <renxiu.liang@windriver.com>
Cc: ltp-list@lists.sf.net
Subject: Re: [LTP] [Patch] Fix mtest06 failure: caught unexpected signal
- 11 --- exiting
Date: Wed, 1 Sep 2010 00:26:47 -0700

On Mon, Aug 30, 2010 at 6:51 PM, renxiu liang
<renxiu.liang@windriver.com> wrote:
> On Wed, 2010-08-25 at 20:36 -0700, Garrett Cooper wrote:
>> On Wed, Aug 18, 2010 at 12:33 AM, renxiu liang
>> <renxiu.liang@windriver.com> wrote:
>> > Hi,
>> >
>> > We met the mtest06 failure several times; this is because in
>> > mtest06/mmap1.c, when handling the signal 11 in sig_handler, it doesn't
>> > cover another two race conditions:
>> > one is si_code equals "SEGV_MAPERR" but si_address does not equal to
>> > map_address; and one is si_code equals to "SEGV_ACCERR";
>> >
>> > see below error log:
>> >
>> > <<<test_start>>>
>> > tag=mtest06 stime=1270902396
>> > cmdline="  mmap1 -x 0.05"
>> > contacts=""
>> > analysis=exit
>> > initiation_status="ok"
>> > <<<test_output>>>
>> > mmap1       0  INFO  :  pid[5456]: map, change contents, unmap files
>> > 1000 times
>> > mmap1       0  INFO  :  created thread[1216369840]
>> > mmap1       0  INFO  :  pid[5456] - read contents of memory 0x48002000
>> > 1000 times
>> > mmap1       0  INFO  :  page fault occurred at 0x48002000
>> > mmap1       0  INFO  :  page fault occurred at 0x48002000
>> > mmap1       0  INFO  :  page fault occurred at 0x48002000
>> > mmap1       0  INFO  :  page fault occurred at 0x48002000
>> > ......
>> > mmap1       0  INFO  :  page fault occurred at 0x48002000
>> > mmap1       0  INFO  :  page fault occurred at 0x48002000
>> > caught unexpected signal - 11 --- exiting
>> > <<<execution_status>>>
>> > duration=1 termination_type=exited termination_id=255 corefile=no
>> > cutime=0 cstime=4
>> > <<<test_end>>>
>> >
>> > I made a patch to cover all the three race conditions in one case in
>> > sig_handler(),
>> > then run mtest06 repeatedly on different archs, test will not fail by
>> > catching signal 11.
>>
>> Could you print out what the value of info->si_code and info->si_addr
>> are at the time of the fault? Also, which architecture(s) are you
>> running into this issue on?
> Hi Garrett,
>
> Sorry for the late reply; See attached mtest06 logs, I printed out the
> values of si_code, si_addr, map_address;
> it is reproducible on arm, x86, ppc and mips; though it is not
> reproducible every time, but can be reproducible if run the case
> repeatedly.

Nothing is jumping out at me as being incorrect, so I think it's best
that I bring in a better pair of eyes, just in case.

Suzuki-san,
    Could you please help review this patch?
Thanks!
-Garrett
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