0262ea1ff9
Error like "morestack on g0" is one of the errors that is very hard to debug, because often it doesn't print a useful stack trace. The runtime doesn't directly print a stack trace because it is a bad stack state to call print. Sometimes the SIGABRT may trigger a traceback, but sometimes not especially in a cgo binary. Even if it triggers a traceback it often does not include the stack trace of the bad stack. This CL makes it explicitly print a stack trace and throw. The idea is to have some space as an "emergency" crash stack. When the stack is in a really bad state, we switch to the crash stack and do a traceback. Currently only implemented on AMD64 and ARM64. TODO: also handle errors like "morestack on gsignal" and bad systemstack. Also handle other architectures. Change-Id: Ibfc397202f2bb0737c5cbe99f2763de83301c1c1 Reviewed-on: https://go-review.googlesource.com/c/go/+/419435 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Pratt <mpratt@google.com> |
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