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From Niklas Edmundsson <ni...@acc.umu.se>
Subject Re: httpd 2.4.25, mpm_event, ssl: segfaults
Date Fri, 03 Feb 2017 08:09:57 GMT
On Thu, 2 Feb 2017, Jacob Champion wrote:

> On 02/02/2017 03:05 PM, Yann Ylavic wrote:
>> Hmm, Linux raises SIGBUS if an mmap is used after the underlying file
>> has been truncated (see [1]).
>
> See also https://bz.apache.org/bugzilla/show_bug.cgi?id=46688 .
>
> Niklas, just to clarify: you're not willfully truncating large files as 
> they're being served, right? I *can* reproduce a SIGBUS if I start truncating 
> files during my stress testing. But EnableMMAP's documentation calls that 
> case out explicitly.

We're using our own large-file tuned cache module (I know, we should 
really publish it properly), and clean on oldest atime with a script 
that does rm. There's nothing cache-related that I know of that ever 
truncates files.

Just to rule it out, I changed our httpd init script to leave the 
stacksize ulimit at Linux default (8MB) without changing anything 
else.

/Nikke
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