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port-amd64/51934: ATF tests hang at kernel/t_ptrace_wait:signal4 under qemu

>Number:         51934
>Category:       port-amd64
>Synopsis:       ATF tests hang at kernel/t_ptrace_wait:signal4 under qemu
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Feb 01 15:30:00 +0000 2017
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date >= 2017.

System: NetBSD 7.0 NetBSD 7.0 (GENERIC) #0: Thu Mar 3 22:52:02 EET 2016 amd64
Architecture: x86_64
Machine: amd64

Since kamil's commit of src/tests/kernel/t_ptrace_wait.c 1.64 at CVS
source date 2017., the ATF test runs on the TNF testbed
have been timing out.  They appear to hang while running the signal4
test case of the kernel/t_ptrace_wait test.  The log from the most
recent failure is here:

This does not happen on real hardware, so it may well be a qemu bug
rather than a NetBSD one, but I figure this should have a PR anyway so
we have a PR number to refer to if the test gets marked as an
"expected failure".

I'm wondering if this might be related to kern/49603, since it also
affects traced processes on amd64 under qemu.


Run the ATF tests on -current/amd64 under qemu, or inspect the testbed


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