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lib/55829: memmem_oob test case sometimes fails

>Number:         55829
>Category:       lib
>Synopsis:       memmem_oob test case sometimes fails
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Nov 27 13:40:00 +0000 2020
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current
System: NetBSD
Architecture: x86_64
Machine: amd64

The memmem_oob test case of the lib/libc/string/t_memmem test
sometimes fails with a SIGSEGV.  The failures are rare, but I'm
calling this serious because the test is supposedly testing for
out-of-bounds accesses, and if that is in fact what's happening,
it should be treated as a potential security issue.

There has been two failures so far this year on my testbed, on
real amd64 hardware:

and one on the TNF testbed, on qemu/nvmm:



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