https://bugs.kde.org/show_bug.cgi?id=378732
Bug ID: 378732
Summary: False positive on recent versions of bash
Product: valgrind
Version: 3.12.0
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: memcheck
Assignee: jsew...@acm.org
Reporter: r...@sc3d.org
Target Milestone: ---
Running bash 4.3 as shipped in Ubuntu 16.04, or bash 4.4 or current git master
head compiled from source on Ubuntu 16.04, I get:
$ valgrind bash -c 'exit 0'
==30344== Memcheck, a memory error detector
==30344== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==30344== Using Valgrind-3.12.0 and LibVEX; rerun with -h for copyright info
==30344== Command: bash -c exit\ 0
==30344==
==30344== Invalid free() / delete / delete[] / realloc()
==30344== at 0x4C2ED5B: free (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==30344== by 0x45E1D0: unwind_frame_run_internal.constprop.3
(unwind_prot.c:301)
==30344== by 0x45E37F: without_interrupts (unwind_prot.c:107)
==30344== by 0x45E37F: run_unwind_frame (unwind_prot.c:135)
==30344== by 0x47B664: parse_and_execute (evalstring.c:421)
==30344== by 0x4209D6: run_one_command (shell.c:1348)
==30344== by 0x41F893: main (shell.c:695)
==30344== Address 0x423b6e8 is in the brk data segment 0x4228000-0x423bfff
==30344==
==30344==
==30344== HEAP SUMMARY:
==30344== in use at exit: 0 bytes in 0 blocks
==30344== total heap usage: 66 allocs, 67 frees, 10,915 bytes allocated
==30344==
==30344== All heap blocks were freed -- no leaks are possible
==30344==
==30344== For counts of detected and suppressed errors, rerun with: -v
==30344== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
See https://lists.gnu.org/archive/html/bug-bash/2017-04/msg00042.html for an
analysis by bash's maintainer. I confirmed this by adding printfs to show that
the malloced address is the same one that valgrind later complains about.
It would be nice to get this fixed, as it causes problems for test suites of
other programs (see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=849517 )
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