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Date: Mon, 4 Jun 2018 05:41:29 -0400
From: Rich Felker <>
Subject: Re: SIGSEGV and SIGILL at malloc/free on ARM926

On Mon, Jun 04, 2018 at 04:45:28PM +0800, 徐露 wrote:
> Hi all,
>  I use Openwrt project and the version of musl libc is 1.1.16. 
>  I have been experiencing random crashes when running customer's application.
>  From the coredump files, the segfault looks like a memory corruption issue. But when I add some malloc and free log, the issues did not occur.
>  After analyzing several coredump files, I found that the last bit of cszie in chunk has seemed to be set from 1 to 0.
>  This is very strange and I don't have many ideas how to go further.
>  Could you please give us some pointers, thanks! I can supply more details as needed.

Looks like classic double-free.


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