On 02/10/2018 05:11 AM, Dan Rue wrote:
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
Hi Dan
Thanks for your replies.
I run this case on v4.15, looks this patch is already merged to v4.15. lizhijian@inn:~/linux$ git describe 4c1baad v4.15-rc2-2-g4c1baad223906
Thanks
Dan
NOTE: 0Day can reproduce this issue in 20% on 0Day.
Anybody can help have a look?
Thanks Zhjian
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