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runtime: frequent crashes with "exit status 16962" on netbsd-arm64-bsiegert builder #42422

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@4a6f656c
#!watchflakes
post <- goos == "netbsd" && goarch == "arm64" && `exit status 16962`

The netbsd/arm64 builder regularly fails with a process (usually compile) exiting with exit status 16962 - some examples:

https://build.golang.org/log/21955ac5c870203c1e6ff0c9c4f3437c10778dbf
https://build.golang.org/log/f58d31621ecf6eb5317790d7683479bb44b9561d
https://build.golang.org/log/96764e29f501a683cccf7006af49b865d0e2f133

16962 is 0x4242 hexadecimal, which seems to suggest that sigreturn_tramp is failing to call setcontext:

https://github.com/golang/go/blob/master/src/runtime/sys_netbsd_arm64.s#L275

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FrozenDueToAgeNeedsInvestigationSomeone must examine and confirm this is a valid issue and not a duplicate of an existing one.OS-NetBSDWaitingForInfoIssue is not actionable because of missing required information, which needs to be provided.arch-arm64compiler/runtimeIssues related to the Go compiler and/or runtime.

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