Change in ...osmo-ggsn[master]: Remove packets in tx queue belonging pdp being freed

pespin gerrit-no-reply at
Fri Aug 16 14:56:23 UTC 2019

Hello lynxis lazus, keith, Jenkins Builder, 

I'd like you to reexamine a change. Please visit

to look at the new patch set (#2).

Change subject: Remove packets in tx queue belonging pdp being freed

Remove packets in tx queue belonging pdp being freed

Doing so should avoid the crash seen in OS#3956, where a message is
received in osmo-sgsn gtp iface after having received a DeleteCtxAccept
message where pdp and associated cbp is freed. As a result, when new
confirmation arrives, it can still be matched against an old request and
be sent to upper layers providing an already freed cbp.

With this patch, since all queued messages belonging to that pdp are
dropped, confirmation won't find a match and be discarded in libgtp.

In order to be able to drop all req messages belonging to a pdp, a new list
is added to pdp_t and qmsg_t are added to that list when inserted into the per-gsn
req transmit queue. This way upon pdp free time it's simply a
matter of iterating over that list to remove all messages.

There's no need to do same for resp queue, and it'd be actually
counter-productive, because it wouldn't be possible to detect and
discard duplicates anymore after pdp ctx has been freed.

Related: OS#3956
Change-Id: Id86d0b241454d3ad49c64c28087fd2710fa2d17a
M gtp/gtp.c
M gtp/pdp.c
M gtp/pdp.h
M gtp/queue.c
M gtp/queue.h
6 files changed, 27 insertions(+), 1 deletion(-)

  git pull ssh:// refs/changes/28/15228/2
To view, visit
To unsubscribe, or for help writing mail filters, visit

Gerrit-Project: osmo-ggsn
Gerrit-Branch: master
Gerrit-Change-Id: Id86d0b241454d3ad49c64c28087fd2710fa2d17a
Gerrit-Change-Number: 15228
Gerrit-PatchSet: 2
Gerrit-Owner: pespin <pespin at>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: keith <keith at>
Gerrit-Reviewer: lynxis lazus <lynxis at>
Gerrit-Reviewer: pespin <pespin at>
Gerrit-MessageType: newpatchset
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <>

More information about the gerrit-log mailing list