test_brk_collision in ubuntu_qrt_kernel_aslr_collisions failed on T

[Po-Hsu Lin]

Issue found on 3.13.0-190.241 lowlatency kernel with node gonzo (passed with generic kernel on another node onibi)

Manually tested with:
  * node "onibi" + 3.13.0-190 lowlatency kernel: passed
  * node "onibi" + 3.13.0-170 generic kernel: passed
  * node "gonzo" + 3.13.0-190 generic kernel: failed
  * node "gonzo" + 3.13.0-189 generic kernel: failed
  * node "gonzo" + 3.13.0-170 generic kernel: failed

Looks like this is not a regression but rather a hardware-specific issue.

Test fail rate 5 out of 5 attempts.

Test log:
 test_brk_collision (__main__.KernelASLRCollisionsTest)
 Check if brk crashes into mmap in 10,000 execs (i386, nx-emu only) (LP: #452175) ... FAIL
 test_stack_collision (__main__.KernelASLRCollisionsTest)

 Check if stack crashes into mmap in 100,000 execs (amd64 only?) (LP: #504164) ... ok

 ======================================================================
 FAIL: test_brk_collision (__main__.KernelASLRCollisionsTest)
 Check if brk crashes into mmap in 10,000 execs (i386, nx-emu only) (LP: #452175)
 ----------------------------------------------------------------------
 Traceback (most recent call last):
   File "./test-kernel-aslr-collisions.py", line 95, in test_brk_collision
     self.assertShellExitEquals(0, ['./explode-brk'])
   File "/home/ubuntu/autotest/client/tmp/ubuntu_qrt_kernel_aslr_collisions/src/qa-regression-testing/scripts/testlib.py", line 1203, in assertShellExitEquals
     self.assertEqual(expected, rc, msg + result + report)
 AssertionError: Got exit code 1, expected 0
 Command: './explode-brk'
 Output:
 7f59c8fd8000-7f59c9196000 r-xp 00000000 08:01 3281122 /lib/x86_64-linux-gnu/libc-2.19.so
 7f59c9196000-7f59c9396000 ---p 001be000 08:01 3281122 /lib/x86_64-linux-gnu/libc-2.19.so
 7f59c9396000-7f59c939a000 r--p 001be000 08:01 3281122 /lib/x86_64-linux-gnu/libc-2.19.so
 7f59c939a000-7f59c939c000 rw-p 001c2000 08:01 3281122 /lib/x86_64-linux-gnu/libc-2.19.so
 7f59c939c000-7f59c93a1000 rw-p 00000000 00:00 0
 7f59c93a8000-7f59c93cb000 r-xp 00000000 08:01 3281111 /lib/x86_64-linux-gnu/ld-2.19.so
 7f59c95ca000-7f59c95cb000 r--p 00022000 08:01 3281111 /lib/x86_64-linux-gnu/ld-2.19.so
 7f59c95cb000-7f59c95cc000 rw-p 00023000 08:01 3281111 /lib/x86_64-linux-gnu/ld-2.19.so
 7f59c95cc000-7f59c95cd000 rw-p 00000000 00:00 0
 7f59c95d0000-7f59c95d1000 r-xp 00000000 08:01 15470803 /home/ubuntu/autotest/client/tmp/ubuntu_qrt_kernel_aslr_collisions/src/qa-regression-testing/scripts/kernel-aslr-collisions/explode-brk
 7f59c97d0000-7f59c97d1000 r--p 00000000 08:01 15470803 /home/ubuntu/autotest/client/tmp/ubuntu_qrt_kernel_aslr_collisions/src/qa-regression-testing/scripts/kernel-aslr-collisions/explode-brk
 7f59c97d1000-7f59c97d2000 rw-p 00001000 08:01 15470803 /home/ubuntu/autotest/client/tmp/ubuntu_qrt_kernel_aslr_collisions/src/qa-regression-testing/scripts/kernel-aslr-collisions/explode-brk
 7f59c97d4000-7f59c97d8000 rw-p 00000000 00:00 0 [heap]
 7fffd59ff000-7fffd5a20000 rw-p 00000000 00:00 0 [stack]
 7fffd5a20000-7fffd5a22000 r-xp 00000000 00:00 0 [vdso]
 ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]
 FAIL: unable to use brk area at 0x7f59c97d4000 - 0x7f59c97dc000

 ----------------------------------------------------------------------
 Ran 5 tests in 467.450s

 FAILED (failures=1)

No output printed in /var/log/syslog

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1978038

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.