getrandom02 in ubuntu_ltp_syscalls failed with X-kvm

[Po-Hsu Lin]

This test will time out with X-KVM kernel on a KVM node.

<<<test_start>>>
tag=getrandom02 stime=1539245024
cmdline="getrandom02"
contacts=""
analysis=exit
<<<test_output>>>
tst_test.c:1072: INFO: Timeout per run is 0h 05m 00s
getrandom02.c:72: PASS: getrandom returned 256
getrandom02.c:72: PASS: getrandom returned 6
getrandom02.c:72: PASS: getrandom returned 256
Test timeouted, sending SIGKILL!
tst_test.c:1112: INFO: If you are running on slow machine, try exporting LTP_TIMEOUT_MUL > 1
tst_test.c:1113: BROK: Test killed! (timeout?)

Summary:
passed 3
failed 0
skipped 0
warnings 0

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-1036-kvm 4.4.0-1036.42
ProcVersionSignature: User Name 4.4.0-1036.42-kvm 4.4.155
Uname: Linux 4.4.0-1036-kvm x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
Date: Thu Oct 11 08:05:56 2018
SourcePackage: linux-kvm
UpgradeStatus: No upgrade log present (probably fresh install)

[Colin Ian King (colin-king)]

I suspect that the entropy pool ran out of bits

[Po-Hsu Lin (cypressyew)]

Found on C-AWS ARM64 (AMD64 is fine) as well, need to check if it can work with LTP_TIMEOUT_MUL > 1

And the next question is how to determine when to use that parameter.

[Po-Hsu Lin (cypressyew)]

LTP_TIMEOUT_MUL=2 to set timeout to 10min for a test works for this test.
Testing patches now.

[Po-Hsu Lin (cypressyew)]

Need LTP_TIMEOUT_MUL=3 for KVM nodes. Will push the patch.

[Po-Hsu Lin (cypressyew)]

https://kernel.ubuntu.com/git/ubuntu/autotest-client-tests.git/commit/?id=2b18c1a3f5311a979d83f84e601fae31bc47f123