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tree-prof parallel make check failures


I'm seeing a number of failures in different tests in the tree-prof
directory when I run make check in parallel none of which are
reproducible with -j1.  I don't see anything about in Bugzilla or
in recent test results.  Has anyone noticed this or am I missing
something?

This is on a 56-core x86_64 machine running Fedora 21 and DejaGnu
1:1.5.1-4.fc21 installed.

Thanks
Martin

Serial make check passes:
$ make -C /build/gcc-49905 check-c RUNTESTFLAGS='tree-prof.exp'
...
		=== gcc Summary ===

# of expected passes		307
# of unsupported tests		48
/build/gcc-49905/gcc/xgcc  version 7.0.0 20160920 (experimental) (GCC)


Parallel make check fails a bunch of different tests each time
it's run:
$ make -C /build/gcc-49905 -j80 -k check-c RUNTESTFLAGS='tree-prof.exp' 2>&1 | grep FAIL
FAIL: gcc.dg/tree-prof/peel-1.c execution,    -g
FAIL: gcc.dg/tree-prof/update-tailcall.c execution,    -g
FAIL: gcc.dg/tree-prof/cold_partition_label.c execution,    -g
FAIL: gcc.dg/tree-prof/val-prof-1.c execution,    -g
FAIL: gcc.dg/tree-prof/pr45354.c execution,    -g
FAIL: gcc.dg/tree-prof/val-prof-2.c execution,    -g
FAIL: gcc.dg/tree-prof/crossmodule-indircall-1.c execution,    -g
FAIL: gcc.dg/tree-prof/crossmodule-indircall-1a.c execution,    -g
FAIL: gcc.dg/tree-prof/pr52027.c execution,    -g
FAIL: gcc.dg/tree-prof/20041218-1.c execution,    -g

and again:
$ nice make -C /opt/notnfs/msebor/build/gcc-49905 -j80 -k check-c RUNTESTFLAGS='tree-prof.exp' 2>&1 | grep FAIL
FAIL: gcc.dg/tree-prof/bb-reorg.c execution,    -g
FAIL: gcc.dg/tree-prof/prof-robust-1.c execution,    -g
FAIL: gcc.dg/tree-prof/update-loopch.c execution,    -g
FAIL: gcc.dg/tree-prof/crossmodule-indircall-1a.c execution,    -g
FAIL: gcc.dg/tree-prof/switch-case-2.c execution,    -g
FAIL: gcc.dg/tree-prof/ic-misattribution-1.c execution,    -g
FAIL: gcc.dg/tree-prof/tracer-1.c execution,    -g


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