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Re: 4.3.90 release candidate segfaults on linux and solaris

From: Denis Excoffier
Subject: Re: 4.3.90 release candidate segfaults on linux and solaris
Date: Sat, 24 Sep 2022 18:23:05 +0200

> On 2022-09-24 17:19, Paul Smith wrote:
> On Sat, 2022-09-24 at 09:36 +0200, Denis Excoffier wrote:
>> In my specific configuration (under linux, with --disable-nls,
>> --disable-load, without using -j, using 'env -i make -d -n'), a
>> segfault always occurs around line 118 of src/expand.c:
>> My linux is old (2.6.32),
> The kernel version is not very interesting for a userspace program like
> GNU make.  But, it would be interesting if you could provide the
> version of libc you are using; on my system I can use:
>  ~$ /lib/x86_64-linux-gnu/libc.so.6 --version | head -n1
> You can find the library by running "ldd make | grep libc'
> It's also interesting you're running with "env -i" that seems like it
> might be related.  Do you get the crash if you run without that?
> A quick check on my system was not able to show any issues using the
> same setup as you, even building make with ASAN.  I will review the
> code especially around memory handling in the child structures to see
> if I can find an error by inspection.

% ldd make
        linux-gate.so.1 (0xb76e4000)
        libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xb7565000)
        /lib/ld-linux.so.2 (0xb76e5000)
% /lib/i386-linux-gnu/libc.so.6 --version | head -2
GNU C Library (Debian GLIBC 2.19-18+deb8u10) stable release version 2.19, by 
Roland McGrath et al.
Copyright (C) 2014 Free Software Foundation, Inc.

The segfault also occurs without ‘env -i’. I was just trying to minimize the 
number of
entries in the environment. In any case make seems to always add a few ones
by default (like MAKEFLAGS etc.).

The crashes in solaris and linux are so similar, and go away also so similarly,
that i would primarily think about size of types. Under cygwin and
MacOS all sizes (pointers, long int, size_t, SIZE_MAX, time_t) are 8, while
under (this) solaris and (this) linux all sizes are 4. Only size of int is 4 on 


Denis Excoffier.

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