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[Jürg Häfliger <1978038@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1978038

Title:
  test_brk_collision in ubuntu_qrt_kernel_aslr_collisions failed on T

Status in QA Regression Testing:
  New
Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Trusty:
  Incomplete

Bug description:
  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

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