Excessive memory usage?

[someplaceguy]

When building wangle version 2024.03.11.00 on a RPi4 running NixOS, I ran into the following test failure:

14/14 Test #12: SSLContextManagerTest ................Subprocess killed***Exception:  71.72 sec
Note: Google Test filter = -SSLContextManagerTest.TestSingleClientCAFileSet:SSLContextManagerTest.TestMultipleClientCAsSet:SSLContextManagerTest.TestSessionContextCertRemoval
[==========] Running 8 tests from 1 test suite.
[----------] Global test environment set-up.
[----------] 8 tests from SSLContextManagerTest
[ RUN      ] SSLContextManagerTest.Test1
[       OK ] SSLContextManagerTest.Test1 (23 ms)
[ RUN      ] SSLContextManagerTest.TestResetSSLContextConfigs
[       OK ] SSLContextManagerTest.TestResetSSLContextConfigs (127 ms)
[ RUN      ] SSLContextManagerTest.TestCertificateWithNoCN


93% tests passed, 1 tests failed out of 14

Total Test time (real) =  72.82 sec

The following tests FAILED:
         12 - SSLContextManagerTest (Subprocess killed)
Errors while running CTest
make: *** [Makefile:91: test] Error 8

The problem seems to be because the machine ran out of memory and the OOM killer was invoked because the test process was using more than 6 GB of RAM, as you can see in this kernel log excerpt:

[213737.065545] [  pid  ]   uid  tgid total_vm      rss pgtables_bytes swapents oom_score_adj name
(...)
[213738.304241] [1301889] 30001 1301889  5645152  1552672 26828800  1774976             0 SSLContextManag                                                                                                           13:18:51 [120/20620]
(...)
[213738.414744] Out of memory: Killed process 1301889 (SSLContextManag) total-vm:22580608kB, anon-rss:6210560kB, file-rss:128kB, shmem-rss:0kB, UID:30001 pgtables:26200kB oom_score_adj:0

I skimmed the test's source code (wangle/ssl/test/SSLContextManagerTest.cpp) and since I didn't see anything that would warrant such excessive memory usage, I decided to file this issue just in case.

Thanks.

[someplaceguy]

I just tried to build this on an ARM64 machine with more memory but I still ran into the OOM killer. This time the test process was using ~11 GB of RAM:

2024-06-25T12:54:21.980897+00:00 orange kern.err kernel: Out of memory: Killed process 1636309 (SSLContextManag) total-vm:52632448kB, anon-rss:11877248kB, file-rss:512kB, shmem-rss:0kB, UID:30011 pgtables:50396kB oom_score_adj:0