https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241258
Bug ID: 241258
Summary: Error building 12.1-RC1 from 11.3, "jevents" program
getting a sigsegv in /usr/src/lib/libpmc/pmu-events
Product: Base System
Version: 12.1-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: b...@freebsd.org
Reporter: sig...@gmail.com
buildworld failed like that while trying to build 12.1-RC1 (as of r353451) on a
11.3-RELEASE-p1 system:
--- libpmc_events.c ---
./pmu-events/jevents "x86" /usr/src/lib/libpmc/pmu-events/arch libpmc_events.c
Segmentation fault
*** [libpmc_events.c] Error code 139
make[5]: stopped in /usr/src/lib/libpmc
1 error
With this change it doesn't fail anymore:
Index: lib/libpmc/pmu-events/jevents.c
===================================================================
--- lib/libpmc/pmu-events/jevents.c (revision 353534)
+++ lib/libpmc/pmu-events/jevents.c (working copy)
@@ -119,8 +119,7 @@
char *e = s + strlen(s);
/* Remove trailing dots that look ugly in perf list */
- --e;
- while (e >= s && isspace(*e))
+ while (e > s && isspace(e[-1]))
--e;
if (*e == '.')
*e = 0;
Dunno if the problem happens because of something specific to this system but
this loop is wrong nevertheless (it could access before the string if it was
empty or all spaces).
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