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This CL (292558b) broke Dragonfly:
runtime: restore the Go-allocated signal stack in unminit
I emailed Austin & Ian details of how to access a VM I created.
/cc @aclements @ianlancetaylor
This most likely has to do with the fact that on DragonFly a newly created thread inherits the alternate signal stack of the creating thread. See the comment in minit in runtime/os_dragonfly.go.
Sorry, I was looking at an old source tree due to a complex accident. DragonFly used to work that way, but it's been fixed.
Change https://golang.org/cl/83035 mentions this issue: runtime: don't use MAP_STACK on DragonFly in SigStack test
runtime: don't use MAP_STACK on DragonFly in SigStack test
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