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Bug#1020559: libc6: After upgrading libc6 expr is crashing with "stack smashing detected"

Vasudev Kamath <vasudev-debian@copyninja.info> writes:

> Post installation of usrmerge this output is changed
>
> └─(09:37:07 on master)──> ls -ld /lib/x86_64-linux-gnu/libc.so.6                                                                                                            1 ↵ ──(Mon,Sep26)─┘
> -rwxr-xr-x 1 root root 2061320 Sep 23 01:32 /lib/x86_64-linux-gnu/libc.so.6
> ┌─(~/.emacs.d)─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────(vasudeva.sk@bhrigu:pts/8)─┐
> └─(09:37:20 on master)──> ls -ld /usr/lib/x86_64-linux-gnu/libc.so.6                                                                                                            ──(Mon,Sep26)─┘
> -rwxr-xr-x 1 root root 2049032 Sep 11 03:35 /usr/lib/x86_64-linux-gnu/libc.so.6
> ┌─(~/.emacs.d)─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────(vasudeva.sk@bhrigu:pts/8)─┐
> └─(09:37:25 on master)──> ls -ld /lib                                                                                                                                           ──(Mon,Sep26)─┘
> drwxr-xr-x 9 root root 4096 Sep 26 09:32 /lib
> ┌─(~/.emacs.d)─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────(vasudeva.sk@bhrigu:pts/8)─┐
> └─(09:38:14 on master)──>
>
> So looks like my system is not in sane state. Do I need to just delete
> /usr/lib/ libc and try this?.

From objdump -p output it looks like /lib version is the 2.35

3 0x00 0x069691b2 GLIBC_2.32
        GLIBC_2.31
34 0x00 0x069691b3 GLIBC_2.33
        GLIBC_2.32
35 0x00 0x069691b4 GLIBC_2.34
        GLIBC_2.33
36 0x00 0x069691b5 GLIBC_2.35
        GLIBC_2.34
37 0x00 0x0963cf85 GLIBC_PRIVATE
        GLIBC_2.35

and /usr/lib version is 2.34

        GLIBC_2.30
33 0x00 0x069691b2 GLIBC_2.32
        GLIBC_2.31
34 0x00 0x069691b3 GLIBC_2.33
        GLIBC_2.32
35 0x00 0x069691b4 GLIBC_2.34
        GLIBC_2.33
36 0x00 0x0963cf85 GLIBC_PRIVATE
        GLIBC_2.34

And post removing /usr/lib version of libc it seems to work fine and no
crash is happening.

└─(09:44:30 on master)──> expr                                                                                                                                              1 ↵ ──(Mon,Sep26)─┘
expr: missing operand
Try 'expr --help' for more information.
┌─(~/.emacs.d)─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────(vasudeva.sk@bhrigu:pts/8)─┐
└─(09:44:39 on master)──>

Cheers,
Vasudev
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