>
> Hi all:
>
> I meet a kernel problem about the random segmentation fault(x86_64). In my
> testcase, the size of local variables exceeds 20MB.
> when run the testcase, it will cause segmentation fault(because the default
> stack size limit is 8192KB).
> when I increase the stack size limit to 1024000KB(ulimit -s 1024000), the
> testcase will pass.
>
> But when I run the testcase 100 times, it will cause random segmentation
> fault.
>
> Maybe the commit fee7e49d45149fba60156f5b59014f764d3e3728 "mm: propagate
> error from stack expansion even for guard page"
> cause this problems, when I revert it, the testcase will not cause random
> segmentation fault problem.
>
> Can anyone give some ideas about this problem?
>
> Best Regards
> Wang Long
>
> ############ Test Environment #############
>
> # uname -a
> Linux ivybridge 4.1.0-rc2+ #3 SMP PREEMPT Wed May 6 10:46:57 CST 2015 x86_64
> x86_64 x86_64 GNU/Linux
>
>
> ############ The Testcase ################
>
> #include <stdio.h>
> #include <stdlib.h>
> #include <sys/resource.h>
>
> #define KB *1024
> #define MB *(1024*1024)
> #define GB *(1024*1024*1024)
>
> int main(int argc, char** argv)
> {
> int ret;
> struct rlimit rlim;
>
> rlim.rlim_cur=20 MB;
> rlim.rlim_max=20 MB;
Can you please get rlimit before setting it?
And try again without reverting fee7e49d45?
> ret = setrlimit(RLIMIT_AS, &rlim);
> if ( 0 > ret)
> {
> perror("setrlimit failed");
> exit(1);
> }
>
> printf("setrlimit success\n");
>
> char tmp[20 MB];
> int i = 0;
>
> for (i = 0; i < 20 MB; i++)
> {
> tmp[i]=1;
> }
>
> printf("test success\n");
> exit(1);
> }
>
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