A stitched-up PR consisting of commits from #5809, #5843, and #5849 encountered the following errors, which are not deterministically linked to the changes made in the PR:

tests.bins/opt/end2end_test:SecureEnd2end/SecureEnd2endTest.BlockingAuthMetadataPluginAndProcessorSuccess/0 (from grpc.tests)

Failing for the past 1 build (Since Unstable#7163 )
Took 0.89 sec.
add description
Error Message

Failure
Standard Output

D0319 13:28:12.441136151 16366 test_config.c:276] test slowdown: machine=1.000000 build=1.000000 total=1.000000
Note: Google Test filter = SecureEnd2end/SecureEnd2endTest.BlockingAuthMetadataPluginAndProcessorSuccess/0
[==========] Running 1 test from 1 test case.
[----------] Global test environment set-up.
[----------] 1 test from SecureEnd2end/SecureEnd2endTest
[ RUN ] SecureEnd2end/SecureEnd2endTest.BlockingAuthMetadataPluginAndProcessorSuccess/0
I0319 13:28:12.443131069 16366 end2end_test.cc:198] Scenario: proxy 0, credentials ssl
E0319 13:28:12.444652267 16366 tcp_client_posix.c:173] failed to connect to 'ipv6:[::1]:32767': socket error: connection refused
D0319 13:28:12.457330945 16366 metadata.c:230] WARNING: 1 metadata elements were leaked
D0319 13:28:12.457373068 16366 metadata.c:230] WARNING: 1 metadata elements were leaked
D0319 13:28:12.457382996 16366 metadata.c:230] WARNING: 1 metadata elements were leaked
D0319 13:28:12.457390299 16366 metadata.c:230] WARNING: 1 metadata elements were leaked
D0319 13:28:12.457397419 16366 metadata.c:243] WARNING: 1 metadata strings were leaked
D0319 13:28:12.457404266 16366 metadata.c:243] WARNING: 1 metadata strings were leaked
D0319 13:28:12.457411301 16366 metadata.c:243] WARNING: 1 metadata strings were leaked
D0319 13:28:12.457417518 16366 metadata.c:243] WARNING: 1 metadata strings were leaked
D0319 13:28:12.457424042 16366 metadata.c:243] WARNING: 2 metadata strings were leaked
D0319 13:28:12.457431541 16366 metadata.c:243] WARNING: 1 metadata strings were leaked
D0319 13:28:12.457439018 16366 metadata.c:243] WARNING: 1 metadata strings were leaked
D0319 13:28:12.457445425 16366 metadata.c:243] WARNING: 1 metadata strings were leaked
D0319 13:28:12.457452233 16366 metadata.c:243] WARNING: 1 metadata strings were leaked
D0319 13:28:12.457459230 16366 metadata.c:243] WARNING: 1 metadata strings were leaked
[ OK ] SecureEnd2end/SecureEnd2endTest.BlockingAuthMetadataPluginAndProcessorSuccess/0 (14 ms)
[----------] 1 test from SecureEnd2end/SecureEnd2endTest (14 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test case ran. (14 ms total)
[ PASSED ] 1 test.

Caught signal 11
bins/opt/end2end_test[0x547533]
/lib/x86_64-linux-gnu/libpthread.so.0(+0xf8d0)[0x7fde78e408d0]
bins/opt/end2end_test[0x47c5f3]
bins/opt/end2end_test[0x4765b2]
bins/opt/end2end_test[0x4ce1e4]
bins/opt/end2end_test[0x4726c2]
bins/opt/end2end_test[0x46b747]
bins/opt/end2end_test[0x4e7199]
bins/opt/end2end_test[0x4562e2]
bins/opt/end2end_test[0x45b6f1]
bins/opt/end2end_test[0x45b8c3]
/usr/lib/x86_64-linux-gnu/libstdc++.so.6(+0xb6970)[0x7fde789bb970]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x80a4)[0x7fde78e390a4]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7fde7812b87d]
Command terminated by signal 11
real 0.84
user 0.00
sys 0.00