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** [tickets:#1248] mds: sending a bigger message causing application segfault
in full encode when less stack size**
**Status:** accepted
**Milestone:** 4.5.1
**Created:** Tue Jan 27, 2015 10:03 AM UTC by A V Mahesh (AVM)
**Last Updated:** Tue Jan 27, 2015 10:03 AM UTC
**Owner:** A V Mahesh (AVM)
This bug address part of #1246 enhancement ticket.
To improve performance and reduce the traffic of transport ,
we increased the MDS send size in a single message from 18000 to 65536 as
part of enhancement #654.
If MDS application task was created with Medium/less stack size say 32000
and try to send huge message say above 2^16 size message (65536) using
MDS_SENDTYPE_RSP,
because of static allocation of bigger message application is running out of
stack and application is facing segfault.
use-case of sending huge data using MDS_SENDTYPE_RSP` send-type is so far
fist-time/unexposed/unique use-case , so far application are using
SENDTYPE_RSP for to send a short response message received through
SENDTYPE_SNDRSP.
Ideally application were using SENDTYPE_SND, SENDTYPE_SNDRSP, SENDTYPE_SNDRAC &
SENDTYPE_SNDACK, send-types to send huge message to avoid timeout issue between
send & response, that is why the issue was NOT reproducible with normal send
messages.
So, this ticket will only address full encode code path of send message , which
is generic use case and need to be addressed immediately.
Please note that there is another enhancement ticket:#1246, which will identify
more send flows and fix them in coherent manner.
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