os/signal: TestTerminalSignal is failing on multiple builders #22845
Description
| builder | issue | example |
|---|---|---|
| linux-amd64-clang | race between command and ^Z? (only seen once) | link |
| linux-arm | race between command and ^Z? | link |
| linux-s390x-ibm | test timeout | link |
| android-arm-wiko-fever | compilation: could not determine kind of name for C.posix_openpt | link |
| dragonfly-amd64 | context timeout | link |
| solaris-amd64-oraclerel | no ^Z? | link |
| solaris-amd64-smartosbuildlet | compilation: #error "Compiler or options invalid; UNIX 03 and POSIX.1-2001 applications require the use of c99" | link |
I think the linux-arm and linux-amd64-clang failures are due to the ^Z being issued before the command has started. I experience this locally on linux/s390x and if I increase the duration of the intervening time.Sleep call then the test passes. I suspect we need a more robust mechanism to check the command has started than time.Sleep.
I'm not sure why the linux/s390x builder is timing out. I'll investigate.