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SubjectRe: [kselftests] compaction_test is blocked
On Fri, Feb 09, 2018 at 03:53:59PM +0800, Li Zhijian wrote:
> Hi
>
> kselftests is integrated Intel 0Day project.
> Sometimes we found compaction_test is blocked for more than 1 hours until i kill it.
>
> Try to figure out where it is running, i added some log to this case.
>
> the test log is like:
> -------------------
> [ 111.750543] main: 248
> [ 111.750544]-
> [ 111.750821] check_compaction: 98
> [ 111.750822]-
> [ 111.751102] check_compaction: 105
> [ 111.751103]-
> [ 111.751362] check_compaction: 111
> [ 111.751363]-
> [ 111.751621] check_compaction: 118
> [ 111.751622]-
> [ 111.751879] check_compaction: 123
> [ 111.751880]-
> -------------------
> 118 fprintf(stderr, "%s: %d\n", __func__, __LINE__);
> 119 lseek(fd, 0, SEEK_SET);
> 120
> 121 /* Request a large number of huge pages. The Kernel will allocate
> 122 as much as it can */
> 123 fprintf(stderr, "%s: %d\n", __func__, __LINE__); <<<======== the last line we can catch.
> 124 if (write(fd, "100000", (6*sizeof(char))) != (6*sizeof(char))) { <<<<============ blocking position
> 125 perror("Failed to write 100000 to /proc/sys/vm/nr_hugepages\n");
> 126 goto close_fd;
> 127 }
> 128
> 129 lseek(fd, 0, SEEK_SET);
> 130
> 131 fprintf(stderr, "%s: %d\n", __func__, __LINE__);
> 132 if (read(fd, nr_hugepages, sizeof(nr_hugepages)) <= 0) {
> 133 perror("Failed to re-read from /proc/sys/vm/nr_hugepages\n");
> 134 goto close_fd;
> 135 }
> -------------------
>
> According to above log and code, it most likely it is blocking at the writing operation.
>
> my environment is like:
> OS: debian
> kernel: v4.15
> model: Ivytown Ivy Bridge-EP
> nr_cpu: 48
> memory: 64G

Hi Zhijian,

Please try this patch in mainline:

4c1baad22390 kselftest: fix OOM in memory compaction test

Dan

>
>
> NOTE: 0Day can reproduce this issue in 20% on 0Day.
>
> Anybody can help have a look?
>
> Thanks
> Zhjian
>
>
>
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