Semaphore tests are getting failed by signal

[bugproxy]

Problem Description
=================================
Semaphore tests are getting failed by signal

---uname output---
Linux powerkvm5 4.2.0-22-generic #27~14.04.1-Ubuntu SMP Fri Dec 18 10:56:52 UTC 2015 ppc64le ppc64le ppc64le GNU/Linux

---Steps to Reproduce---
Install Tuleta Baremetal with Ubuntu14.04.4.Then download the posixtest suite.

root@powerkvm5:~#wget http://downloads.sourceforge.net/project/posixtest/posixtest/posixtestsuite-1.5.2/posixtestsuite-1.5.2.tar.gz?r=&ts=1452148604&use_mirror=liquidtelecom

untar the downloaded file:
root@powerkvm5:~# tar xvfz posixtestsuite-1.5.2.tar.gz?r=

root@powerkvm5:~/posixtestsuite# make

root@powerkvm5:~/posixtestsuite# ./run_tests SEM

Executing semaphores tests
conformance/interfaces/sem_close/3-2: build: FAILED
conformance/interfaces/sem_close/2-1: link: FAILED
conformance/interfaces/sem_close/1-1: link: FAILED
conformance/interfaces/sem_close/3-1: link: FAILED
conformance/interfaces/sem_close/3-2: build: FAILED
conformance/interfaces/sem_close/2-1: link: FAILED
conformance/interfaces/sem_close/1-1: link: FAILED
conformance/interfaces/sem_close/3-1: link: FAILED
conformance/interfaces/sem_destroy/4-1: link: FAILED
conformance/interfaces/sem_destroy/3-1: link: FAILED
conformance/interfaces/sem_destroy/4-1: link: FAILED
conformance/interfaces/sem_destroy/3-1: link: FAILED
conformance/interfaces/sem_getvalue/5-1: link: FAILED
conformance/interfaces/sem_getvalue/2-1: link: FAILED
conformance/interfaces/sem_getvalue/4-1: link: FAILED
conformance/interfaces/sem_getvalue/1-1: link: FAILED
conformance/interfaces/sem_getvalue/2-2: build: FAILED
conformance/interfaces/sem_getvalue/5-1: link: FAILED
conformance/interfaces/sem_getvalue/2-1: link: FAILED
conformance/interfaces/sem_getvalue/4-1: link: FAILED
conformance/interfaces/sem_getvalue/1-1: link: FAILED
conformance/interfaces/sem_getvalue/2-2: build: FAILED
conformance/interfaces/sem_init/5-1: link: FAILED
conformance/interfaces/sem_init/3-2: build: FAILED
conformance/interfaces/sem_init/2-1: link: FAILED
conformance/interfaces/sem_init/1-1: link: FAILED
conformance/interfaces/sem_init/2-2: link: FAILED
conformance/interfaces/sem_init/3-1: link: FAILED
conformance/interfaces/sem_init/7-1: build: FAILED
conformance/interfaces/sem_init/5-2: link: FAILED
conformance/interfaces/sem_init/3-3: build: FAILED
conformance/interfaces/sem_init/5-1: link: FAILED
conformance/interfaces/sem_init/3-2: build: FAILED
conformance/interfaces/sem_init/6-1: execution: PASS
conformance/interfaces/sem_init/2-1: link: FAILED
conformance/interfaces/sem_init/1-1: link: FAILED
conformance/interfaces/sem_init/2-2: link: FAILED
conformance/interfaces/sem_init/3-1: link: FAILED
conformance/interfaces/sem_init/7-1: build: FAILED
conformance/interfaces/sem_init/5-2: link: FAILED
conformance/interfaces/sem_init/3-3: build: FAILED
conformance/interfaces/sem_open/1-3: link: FAILED
conformance/interfaces/sem_open/1-2: build: FAILED
conformance/interfaces/sem_open/10-1: link: FAILED
conformance/interfaces/sem_open/6-1: link: FAILED
conformance/interfaces/sem_open/2-1: link: FAILED
conformance/interfaces/sem_open/4-1: link: FAILED
conformance/interfaces/sem_open/15-1: build: FAILED
conformance/interfaces/sem_open/1-1: link: FAILED
conformance/interfaces/sem_open/2-2: link: FAILED
conformance/interfaces/sem_open/3-1: link: FAILED
conformance/interfaces/sem_open/1-4: link: FAILED
conformance/interfaces/sem_open/1-3: link: FAILED
conformance/interfaces/sem_open/5-1: execution: PASS
conformance/interfaces/sem_open/1-2: build: FAILED
conformance/interfaces/sem_open/10-1: link: FAILED
conformance/interfaces/sem_open/6-1: link: FAILED
conformance/interfaces/sem_open/2-1: link: FAILED
conformance/interfaces/sem_open/4-1: link: FAILED
conformance/interfaces/sem_open/15-1: build: FAILED
conformance/interfaces/sem_open/1-1: link: FAILED
conformance/interfaces/sem_open/2-2: link: FAILED
conformance/interfaces/sem_open/3-1: link: FAILED
conformance/interfaces/sem_open/1-4: link: FAILED
conformance/interfaces/sem_post/5-1: link: FAILED
conformance/interfaces/sem_post/8-1: link: FAILED
conformance/interfaces/sem_post/1-2: link: FAILED
conformance/interfaces/sem_post/6-1: link: FAILED
conformance/interfaces/sem_post/2-1: link: FAILED
conformance/interfaces/sem_post/4-1: link: FAILED
conformance/interfaces/sem_post/1-1: link: FAILED
conformance/interfaces/sem_post/5-1: link: FAILED
conformance/interfaces/sem_post/8-1: link: FAILED
conformance/interfaces/sem_post/1-2: link: FAILED
conformance/interfaces/sem_post/6-1: link: FAILED
conformance/interfaces/sem_post/2-1: link: FAILED
conformance/interfaces/sem_post/4-1: link: FAILED
conformance/interfaces/sem_post/1-1: link: FAILED
conformance/interfaces/sem_timedwait/9-1: build: FAILED
conformance/interfaces/sem_timedwait/10-1: link: FAILED
conformance/interfaces/sem_timedwait/6-1: link: FAILED
conformance/interfaces/sem_timedwait/2-1: link: FAILED
conformance/interfaces/sem_timedwait/11-1: link: FAILED
conformance/interfaces/sem_timedwait/4-1: link: FAILED
conformance/interfaces/sem_timedwait/6-2: link: FAILED
conformance/interfaces/sem_timedwait/1-1: link: FAILED
conformance/interfaces/sem_timedwait/2-2: link: FAILED
conformance/interfaces/sem_timedwait/3-1: link: FAILED
conformance/interfaces/sem_timedwait/7-1: link: FAILED
conformance/interfaces/sem_timedwait/9-1: build: FAILED
conformance/interfaces/sem_timedwait/10-1: link: FAILED
conformance/interfaces/sem_timedwait/6-1: link: FAILED
conformance/interfaces/sem_timedwait/2-1: link: FAILED
conformance/interfaces/sem_timedwait/11-1: link: FAILED
conformance/interfaces/sem_timedwait/4-1: link: FAILED
conformance/interfaces/sem_timedwait/6-2: link: FAILED
conformance/interfaces/sem_timedwait/1-1: link: FAILED
conformance/interfaces/sem_timedwait/2-2: link: FAILED
conformance/interfaces/sem_timedwait/3-1: link: FAILED
conformance/interfaces/sem_timedwait/7-1: link: FAILED
conformance/interfaces/sem_unlink/5-1: build: FAILED
conformance/interfaces/sem_unlink/9-1: build: FAILED
conformance/interfaces/sem_unlink/6-1: build: FAILED
conformance/interfaces/sem_unlink/2-1: link: FAILED
conformance/interfaces/sem_unlink/4-1: link: FAILED
conformance/interfaces/sem_unlink/4-2: build: FAILED
conformance/interfaces/sem_unlink/1-1: link: FAILED
conformance/interfaces/sem_unlink/2-2: build: FAILED
conformance/interfaces/sem_unlink/3-1: build: FAILED
conformance/interfaces/sem_unlink/7-1: build: FAILED
conformance/interfaces/sem_unlink/5-1: build: FAILED
conformance/interfaces/sem_unlink/9-1: build: FAILED
conformance/interfaces/sem_unlink/6-1: build: FAILED
conformance/interfaces/sem_unlink/2-1: link: FAILED
conformance/interfaces/sem_unlink/4-1: link: FAILED
conformance/interfaces/sem_unlink/4-2: build: FAILED
conformance/interfaces/sem_unlink/1-1: link: FAILED
conformance/interfaces/sem_unlink/2-2: build: FAILED
conformance/interfaces/sem_unlink/3-1: build: FAILED
conformance/interfaces/sem_unlink/7-1: build: FAILED
conformance/interfaces/sem_wait/5-1: link: FAILED
conformance/interfaces/sem_wait/1-2: link: FAILED
conformance/interfaces/sem_wait/11-1: link: FAILED
conformance/interfaces/sem_wait/13-1: build: FAILED
conformance/interfaces/sem_wait/1-1: link: FAILED
conformance/interfaces/sem_wait/3-1: link: FAILED
conformance/interfaces/sem_wait/12-1: link: FAILED
conformance/interfaces/sem_wait/7-1: build: FAILED
conformance/interfaces/sem_wait/5-1: link: FAILED
conformance/interfaces/sem_wait/1-2: link: FAILED
conformance/interfaces/sem_wait/11-1: link: FAILED
conformance/interfaces/sem_wait/13-1: build: FAILED
conformance/interfaces/sem_wait/1-1: link: FAILED
conformance/interfaces/sem_wait/3-1: link: FAILED
conformance/interfaces/sem_wait/12-1: link: FAILED
conformance/interfaces/sem_wait/7-1: build: FAILED
****Tests Complete****

The dmesg ouptut is showing that some tests are getting killed by signals.

root@powerkvm5:/home/ubuntu/pooja/posixtestsuite# dmesg
[69825.398502] sysrq: SysRq : HELP : loglevel(0-9) reboot(b) crash(c) terminate-all-tasks(e) memory-full-oom-kill(f) kill-all-tasks(i) thaw-filesystems(j) sak(k) show-backtrace-all-active-cpus(l) show-memory-usage(m) nice-all-RT-tasks(n) poweroff(o) show-registers(p) show-all-timers(q) unraw(r) sync(s) show-task-states(t) unmount(u) show-blocked-tasks(w) xmon(x) dump-ftrace-buffer(z)
[69826.183851] sysrq: SysRq : HELP : loglevel(0-9) reboot(b) crash(c) terminate-all-tasks(e) memory-full-oom-kill(f) kill-all-tasks(i) thaw-filesystems(j) sak(k) show-backtrace-all-active-cpus(l) show-memory-usage(m) nice-all-RT-tasks(n) poweroff(o) show-registers(p) show-all-timers(q) unraw(r) sync(s) show-task-states(t) unmount(u) show-blocked-tasks(w) xmon(x) dump-ftrace-buffer(z)
[69834.574957] sysrq: SysRq : HELP : loglevel(0-9) reboot(b) crash(c) terminate-all-tasks(e) memory-full-oom-kill(f) kill-all-tasks(i) thaw-filesystems(j) sak(k) show-backtrace-all-active-cpus(l) show-memory-usage(m) nice-all-RT-tasks(n) poweroff(o) show-registers(p) show-all-timers(q) unraw(r) sync(s) show-task-states(t) unmount(u) show-blocked-tasks(w) xmon(x) dump-ftrace-buffer(z)
[69837.502070] sysrq: SysRq : HELP : loglevel(0-9) reboot(b) crash(c) terminate-all-tasks(e) memory-full-oom-kill(f) kill-all-tasks(i) thaw-filesystems(j) sak(k) show-backtrace-all-active-cpus(l) show-memory-usage(m) nice-all-RT-tasks(n) poweroff(o) show-registers(p) show-all-timers(q) unraw(r) sync(s) show-task-states(t) unmount(u) show-blocked-tasks(w) xmon(x) dump-ftrace-buffer(z)
[69861.267010] sysrq: SysRq : HELP : loglevel(0-9) reboot(b) crash(c) terminate-all-tasks(e) memory-full-oom-kill(f) kill-all-tasks(i) thaw-filesystems(j) sak(k) show-backtrace-all-active-cpus(l) show-memory-usage(m) nice-all-RT-tasks(n) poweroff(o) show-registers(p) show-all-timers(q) unraw(r) sync(s) show-task-states(t) unmount(u) show-blocked-tasks(w) xmon(x) dump-ftrace-buffer(z)
[72359.566019] 6-1.test[47168]: unhandled signal 11 at 0000100000070000 nip 00000000100009c4 lr 00000000100009ac code 30002
[72359.584716] 6-2.test[47204]: unhandled signal 11 at 0000100000070000 nip 0000000010000af8 lr 0000000010000aec code 30002
[72361.678098] 6-3.test[47285]: unhandled signal 11 at 0000100000070000 nip 0000000010000a04 lr 00000000100009ec code 30002
[77011.111521] 6-1.test[113462]: unhandled signal 11 at 0000100000070000 nip 00000000100009c4 lr 00000000100009ac code 30002
[77011.129970] 6-2.test[113497]: unhandled signal 11 at 0000100000070000 nip 0000000010000af8 lr 0000000010000aec code 30002
[77013.216000] 6-3.test[113578]: unhandled signal 11 at 0000100000070000 nip 0000000010000a04 lr 0000000010000

== Comment: #4 - PAVITHRA R. PRAKASH <email address hidden> - 2016-02-19 03:56:34 ==
Same behaviour is observed in Ubuntu 16.04.

Logs
-------

*** stack smashing detected ***: conformance/interfaces/strftime/2-1.test terminated
*** buffer overflow detected ***: conformance/interfaces/sem_unlink/1-1.test terminated
======= Backtrace: =========
/lib/powerpc64le-linux-gnu/libc.so.6(+0x89a44)[0x3fffb74f9a44]
/lib/powerpc64le-linux-gnu/libc.so.6(__fortify_fail+0x80)[0x3fffb75b5a20]
/lib/powerpc64le-linux-gnu/libc.so.6(__chk_fail+0x20)[0x3fffb75b2380]
/lib/powerpc64le-linux-gnu/libc.so.6(+0x141388)[0x3fffb75b1388]
/lib/powerpc64le-linux-gnu/libc.so.6(_IO_default_xsputn+0xc8)[0x3fffb74ff2a8]
/lib/powerpc64le-linux-gnu/libc.so.6(_IO_vfprintf+0x1c14)[0x3fffb74ca2c4]
/lib/powerpc64le-linux-gnu/libc.so.6(__vsprintf_chk+0xb8)[0x3fffb75b1458]
/lib/powerpc64le-linux-gnu/libc.so.6(__sprintf_chk+0x2c)[0x3fffb75b134c]
conformance/interfaces/sem_unlink/1-1.test[0x10000718]
/lib/powerpc64le-linux-gnu/libc.so.6(+0x23500)[0x3fffb7493500]
/lib/powerpc64le-linux-gnu/libc.so.6(__libc_start_main+0xb4)[0x3fffb7493734]
======= Memory map: ========
10000000-10010000 r-xp 00000000 08:15 7081082 /root/powerkvm-autotest/client/tmp/posixtest/src/conformance/interfaces/sem_unlink/1-1.test
10010000-10020000 r--p 00000000 08:15 7081082 /root/powerkvm-autotest/client/tmp/posixtest/src/conformance/interfaces/sem_unlink/1-1.test
10020000-10030000 rw-p 00010000 08:15 7081082 /root/powerkvm-autotest/client/tmp/posixtest/src/conformance/interfaces/sem_unlink/1-1.test
3fffb7470000-3fffb7630000 r-xp 00000000 08:15 4456490 /lib/powerpc64le-linux-gnu/libc-2.21.so
3fffb7630000-3fffb7640000 r--p 001b0000 08:15 4456490 /lib/powerpc64le-linux-gnu/libc-2.21.so
3fffb7640000-3fffb7650000 rw-p 001c0000 08:15 4456490 /lib/powerpc64le-linux-gnu/libc-2.21.so
3fffb7650000-3fffb7670000 r-xp 00000000 08:15 4456481 /lib/powerpc64le-linux-gnu/libpthread-2.21.so
3fffb7670000-3fffb7680000 r--p 00010000 08:15 4456481 /lib/powerpc64le-linux-gnu/libpthread-2.21.so
3fffb7680000-3fffb7690000 rw-p 00020000 08:15 4456481 /lib/powerpc64le-linux-gnu/libpthread-2.21.so
3fffb7690000-3fffb76a0000 rw-p 00000000 00:00 0
3fffb76a0000-3fffb76c0000 r-xp 00000000 00:00 0 [vdso]
3fffb76c0000-3fffb7700000 r-xp 00000000 08:15 4456482 /lib/powerpc64le-linux-gnu/ld-2.21.so
3fffb7700000-3fffb7710000 r--p 00030000 08:15 4456482 /lib/powerpc64le-linux-gnu/ld-2.21.so
3fffb7710000-3fffb7720000 rw-p 00040000 08:15 4456482 /lib/powerpc64le-linux-gnu/ld-2.21.so
3ffffb910000-3ffffb940000 rw-p 00000000 00:00 0 [stack]

Mirroring this bugzilla for Canonical's awareness as we have the Ubuntu kernel failing for semaphore tests.

[bugproxy (bugproxy)]

Default Comment by Bridge

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1557967/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Steve Langasek (vorlon)]

The testsuite you're running is segfaulting. This is not a bug in Ubuntu, it's a bug in that testsuite. When you build the testsuite binaries using Ubuntu's hardening-by-default compiler, buffer overflow detection is enabled, which traps program execution immediately with SIGSEGV.

The code of the testsuite you've pointed to has obvious and trivial buffer overflows. The stack trace included in this report points to a sprintf() call in conformance/interfaces/sem_unlink/1-1.c:

#define TEST "1-1"
#define FUNCTION "sem_unlink"

[...]
int main() {
[...]
        char semname[20];

        sprintf(semname, "/" FUNCTION "_" TEST "_%d", getpid());
[...]

The constant part of this string is '/sem_unlink_1-1_', which is 16 characters. Your target array has room for 19 characters (not counting the terminating NUL), leaving only 3 characters for the PID.

There is absolutely no guarantee that the PID of the processes in the test suite will fit in 3 characters. This "POSIX" test suite therefore has undefined behavior according to the C language, which Ubuntu handles by raising SIGSEGV.