https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64001
Bug ID: 64001
Summary: gccgo: crash on stack splitting
Product: gcc
Version: 4.9.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: go
Assignee: ian at airs dot com
Reporter: michael.hudson at canonical dot com
CC: cmang at google dot com
Created attachment 34054
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34054&action=edit
gdb session showing the crash
Hi,
This is probably not going to be a super useful bug report -- I don't have a
small reproducer.
That said: the command "gccgo-go get github.com/lxc/lxd" crashes intermittently
while doing https operations. I'll attach a gdb session. What seems to be
going on is that $rsp is getting corrupted (ending up pointing off into the
weeds or unaligned). It's resisted my attempts to debug it further (for
example, afaict __generic_morestack is always returning sane values). I don't
know if it's relevant that it's happening during an attempt to capture a stack
track for memory profiling.
It doesn't seem to happen with a mainline GCC build I had lying around from a
few weeks ago, but a little poking fails to find any related fixes so it could
just be down to luck as to when the stack split is triggered.
