epoll_wait02 from ubuntu_ltp_syscalls failed on G-5.8-Azure Basic_A2

[Po-Hsu Lin]

Issue found on 5.8.0-1008.8-azure with instance Basic_A2 only.

Test failed with:
 startup='Sun Oct 11 14:38:23 2020'
 tst_test.c:1248: TINFO: Timeout per run is 0h 05m 00s
 sh: 1: systemd-detect-virt: not found
 tst_timer_test.c:357: TINFO: CLOCK_MONOTONIC resolution 1ns
 tst_timer_test.c:369: TINFO: prctl(PR_GET_TIMERSLACK) = 50us
 tst_timer_test.c:263: TINFO: epoll_wait() sleeping for 1000us 500 iterations, threshold 450.01us
 tst_timer_test.c:305: TINFO: min 1061us, max 1371us, median 1096us, trunc mean 1091.72us (discarded 25)
 tst_timer_test.c:326: TPASS: Measured times are within thresholds
 tst_timer_test.c:263: TINFO: epoll_wait() sleeping for 2000us 500 iterations, threshold 450.01us
 tst_timer_test.c:305: TINFO: min 2063us, max 5705us, median 2099us, trunc mean 2096.45us (discarded 25)
 tst_timer_test.c:326: TPASS: Measured times are within thresholds
 tst_timer_test.c:263: TINFO: epoll_wait() sleeping for 5000us 300 iterations, threshold 450.04us
 tst_timer_test.c:305: TINFO: min 5070us, max 5237us, median 5100us, trunc mean 5099.84us (discarded 15)
 tst_timer_test.c:326: TPASS: Measured times are within thresholds
 tst_timer_test.c:263: TINFO: epoll_wait() sleeping for 10000us 100 iterations, threshold 450.33us
 tst_timer_test.c:305: TINFO: min 10074us, max 10982us, median 10112us, trunc mean 10270.36us (discarded 5)
 tst_timer_test.c:326: TPASS: Measured times are within thresholds
 tst_timer_test.c:263: TINFO: epoll_wait() sleeping for 25000us 50 iterations, threshold 451.29us
 tst_timer_test.c:305: TINFO: min 25097us, max 27269us, median 27201us, trunc mean 26889.77us (discarded 2)
 tst_timer_test.c:314: TFAIL: epoll_wait() slept for too long

 Time: us | Frequency
 --------------------------------------------------------------------------------
 25097 | *+
 25212 |
 25327 | *+
 25442 | *+
 25557 |
 25672 | *+
 25787 | *****+
 25902 |
 26017 |
 26132 | *+
 26247 | ***+
 26362 |
 26477 | *+
 26592 |
 26707 | *+
 26822 |
 26937 |
 27052 | ***+
 27167 | ********************************************************************
 --------------------------------------------------------------------------------
 115us | 1 sample = 1.88889 '*', 3.77778 '+', 7.55556 '-', non-zero '.'

 tst_timer_test.c:263: TINFO: epoll_wait() sleeping for 100000us 10 iterations, threshold 537.00us
 tst_timer_test.c:305: TINFO: min 100451us, max 108555us, median 102044us, trunc mean 103175.22us (discarded 1)
 tst_timer_test.c:314: TFAIL: epoll_wait() slept for too long

 Time: us | Frequency
 --------------------------------------------------------------------------------
 100451 | **********************************
 100878 | **********************************
 101305 | **********************************
 101732 | ********************************************************************
 102159 |
 102586 |
 103013 |
 103440 | **********************************
 103867 |
 104294 | **********************************
 104721 |
 105148 |
 105575 | **********************************
 106002 |
 106429 |
 106856 |
 107283 |
 107710 | **********************************
 108137 | **********************************
 --------------------------------------------------------------------------------
 427us | 1 sample = 34.00000 '*', 68.00000 '+', 136.00000 '-', non-zero '.'

 tst_timer_test.c:263: TINFO: epoll_wait() sleeping for 1000000us 2 iterations, threshold 4400.00us
 tst_timer_test.c:305: TINFO: min 1006006us, max 1008065us, median 1006006us, trunc mean 1006006.00us (discarded 1)
 tst_timer_test.c:314: TFAIL: epoll_wait() slept for too long

 Time: us | Frequency
 --------------------------------------------------------------------------------
 1006006 | ********************************************************************
 1006115 |
 1006224 |
 1006333 |
 1006442 |
 1006551 |
 1006660 |
 1006769 |
 1006878 |
 1006987 |
 1007096 |
 1007205 |
 1007314 |
 1007423 |
 1007532 |
 1007641 |
 1007750 |
 1007859 |
 1007968 | ********************************************************************
 --------------------------------------------------------------------------------
 109us | 1 sample = 68.00000 '*', 136.00000 '+', 272.00000 '-', non-zero '.'

 Summary:
 passed 4
 failed 3
 skipped 0
 warnings 0
 tag=epoll_wait02 stime=1602427103 dur=8 exit=exited stat=1 core=no cu=1 cs=2

[Francis Ginther (fginther)]

This is not recurring with 2020.11.30, so removed the kqa-blocker tag.

[Po-Hsu Lin (cypressyew)]

Didn't see this on 5.8.0-1016.17 azure

[Kelsey Steele (kelsey-steele)]

found on groovy/gcp 5.8.0-1015.15

[Po-Hsu Lin (cypressyew)]

Re-open this for GCP-5.8, it looks like this tend to fail on smaller instance (f1-micro / g1-small in this case)

[Po-Hsu Lin (cypressyew)]

Kernel EOL, and this issue does not exist in our hinting database.