https://bugs.kde.org/show_bug.cgi?id=365327

--- Comment #18 from Rhys Kidd <rhysk...@gmail.com> ---
With this patch I saw a regression in massif/tests/mmapunmap on macOS 10.11,
due to the vg_assert(syscallInfo) added in VG_(is_in_syscall)().

For now I'm going to hold off committing that specific part of your v2 patch,
although you could well have uncovered an existing bug that is only being
tickled with this change. 

--- mmapunmap.stderr.exp        2016-04-05 21:07:04.000000000 -0400
+++ mmapunmap.stderr.out        2017-04-29 14:42:38.000000000 -0400
@@ -0,0 +1,19 @@
+
+valgrind: m_syswrap/syswrap-main.c:1691 (Bool vgPlain_is_in_syscall(Int)):
Assertion 'syscallInfo' failed.
+
+host stacktrace:
+   at 0x238014AA3: ???
+   by 0x238014E4C: ???
+   by 0x238014E2A: ???
+   by 0x2380B1228: ???
+   by 0x238030C77: ???
+   by 0x238031030: ???
+   by 0x238003A7A: ???
+   by 0x2380038AE: ???
+   by 0x23801DADC: ???
+   by 0x23801C943: ???
+
+sched status:
+  running_tid=1
+
+Thread 1: status = VgTs_Init (lwpid 0)

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