9d59234cbe
Currently parts of unrecoverable panic handling (notably, printing panic messages) can happen on the user stack. This may grow the stack, which is generally fine, but if we're handling a runtime panic, it's better to do as little as possible in case the runtime is in an inconsistent state. Hence, this commit rearranges the handling of unrecoverable panics so that it's done entirely on the system stack. This is mostly a matter of shuffling code a bit so everything can move into a systemstack block. The one slight subtlety is in the "panic during panic" case, where we now depend on startpanic_m's caller to print the stack rather than startpanic_m itself. To make this work, startpanic_m now returns a boolean indicating that the caller should avoid trying to print any panic messages and get right to the stack trace. Since the caller is already in a position to do this, this actually simplifies things a little. Change-Id: Id72febe8c0a9fb31d9369b600a1816d65a49bfed Reviewed-on: https://go-review.googlesource.com/93658 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> |
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