[Bug 232458] jevents: Program terminated with signal 11, Segmentation fault when build word of 12-STABLE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232458

            Bug ID: 232458
           Summary: jevents: Program terminated with signal 11,
                    Segmentation fault when build word of 12-STABLE
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: iron.udjin at gmail.com

Created attachment 198379
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=198379&action=edit
jevents.truss

Hello,

I'm trying to build world of 12-STABLE r339445 from 11.2-STABLE r339336M and it
fall with error:

===> lib/ofed/libopensm (all)
===> lib/libpcap (all)
===> lib/libpjdlog (all)
===> lib/libpmc (all)
./pmu-events/jevents "x86" /usr/src/lib/libpmc/pmu-events/arch libpmc_events.c
*** Signal 11

Stop.
make[5]: stopped in /usr/src/lib/libpmc
*** Error code 1


# cd /usr/src/lib/libpmc
# gdb --args /usr/obj/usr/src/amd64.amd64/lib/libpmc/pmu-events/jevents "x86"
/usr/src/lib/libpmc/pmu-events/arch libpmc_events.c
(gdb) r
Starting program: /usr/obj/usr/src/amd64.amd64/lib/libpmc/pmu-events/jevents
x86 /usr/src/lib/libpmc/pmu-events/arch libpmc_events.c
Program received signal SIGSEGV, Segmentation fault.
json_events (fn=<value optimized out>, func=0x403f00
<print_events_table_entry>, data=0x7fffffffdf80) at
/usr/src/lib/libpmc/pmu-events/jevents.c:125
125             if (*e == '.')
Current language:  auto; currently minimal
(gdb) bt
#0  json_events (fn=<value optimized out>, func=0x403f00
<print_events_table_entry>, data=0x7fffffffdf80) at
/usr/src/lib/libpmc/pmu-events/jevents.c:125
#1  0x0000000000403b4e in process_one_file (fpath=<value optimized out>,
sb=<value optimized out>, typeflag=0, ftwbuf=<value optimized out>) at
/usr/src/lib/libpmc/pmu-events/jevents.c:1044
#2  0x00000008008972fe in nftw (path=<value optimized out>, fn=0x403680
<process_one_file>, nfds=<value optimized out>, ftwflags=<value optimized out>)
at /usr/src/lib/libc/gen/nftw.c:98
#3  0x0000000000403094 in main (argc=4, argv=<value optimized out>) at
/usr/src/lib/libpmc/pmu-events/jevents.c:1135
(gdb)

CFLAGS: -O2 -pipe -march=native -mtune=native
Clang: 6.0.1 (tags/RELEASE_601/final 335540) (based on LLVM 6.0.1)
Arch: amd64

P.S: Please add FreeBSD 12-STABLE in the "Version:" list.

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