[Bug 11896] New: bunzip2: bunzip fails testsuite on s390x Conditional jump or move depends on uninitialised value(s)

bugzilla at busybox.net bugzilla at busybox.net
Thu May 23 10:56:10 UTC 2019


https://bugs.busybox.net/show_bug.cgi?id=11896

            Bug ID: 11896
           Summary: bunzip2: bunzip fails testsuite on s390x Conditional
                    jump or move depends on uninitialised value(s)
           Product: Busybox
           Version: 1.30.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: xnox at ubuntu.com
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

Originally reported at
https://bugs.launchpad.net/ubuntu/+source/busybox/+bug/1828282 with initial
suspicion at glibc, however later diagnosed to be a busybox issue.

The full analysis is at
https://bugs.launchpad.net/ubuntu/+source/busybox/+bug/1828282/comments/1

In short bz2_issue_11.bz2 test case always fails on s390x since bunzip2 depends
on uninitialised values, which happen to always be "wrong" on s390x.

This is observable with valgrind too:

# valgrind busybox bunzip2 <bz2_issue_11.bz2 2>&1 >/dev/null
==40965== Memcheck, a memory error detector
==40965== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==40965== Using Valgrind-3.14.0 and LibVEX; rerun with -h for copyright info
==40965== Command: busybox bunzip2
==40965== 
==40965== Conditional jump or move depends on uninitialised value(s)
==40965==    at 0x17C1D4: get_next_block (decompress_bunzip2.c:393)
==40965==    by 0x17C37F: get_next_block (decompress_bunzip2.c:419)
==40965== 
bunzip2: bunzip error -5
==40965== 
==40965== HEAP SUMMARY:
==40965==     in use at exit: 0 bytes in 0 blocks
==40965==   total heap usage: 7 allocs, 7 frees, 4,539,696 bytes allocated
==40965== 
==40965== All heap blocks were freed -- no leaks are possible
==40965== 
==40965== For counts of detected and suppressed errors, rerun with: -v
==40965== Use --track-origins=yes to see where uninitialised values come from
==40965== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)


For the time being we are skipping the bz2_issue_11.bz2 test case in ubuntu.

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