runtime: occasional "exit status -1073741819" on windows-386-2008 builder

[bcmills]

2020-09-16T20:59:25-39da81d/windows-386-2008
2020-08-20T15:21:17-3f56862/windows-386-2008
2020-06-25T03:11:43-1bb247a/windows-386-2008
2020-05-20T15:15:16-dfd613e/windows-386-2008

All of the failures seem to occur while testing cmd/compile/internal/ssa, but that may just be because the test is particularly memory-intensive.

ok  	cmd/compile/internal/logopt	0.166s
exit status -1073741819
FAIL	cmd/compile/internal/ssa	0.324s

Note that -1073741819 is 0xffffffffc0000005; see previously #38440, #37483, #37470, #23810.

CC @aclements @cherrymui @randall77 @zx2c4 @alexbrainman

[alexbrainman]

Sorry, but I have no clue what is happening here.

Note that -1073741819 is 0xffffffffc0000005;

0xffffffffc0000005 is ERROR_ACCESS_DENIED. It is just invalid pointer deference - it can happen in trivial situations. See #38440 (comment) for details.

Alex

[bcmills]

https://storage.googleapis.com/go-build-log/92dfdcd7/windows-386-2008_6b4510d4.log (a TryBot)

[mvdan]

Another from a trybot: https://storage.googleapis.com/go-build-log/a50c67e8/windows-386-2008_9d5ac26c.log