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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