Date: Fri, 1 Dec 2017 14:21:36 +0000 From: Martina Balintova <balint.martina@gmail.com> To: net@freebsd.org Subject: Netmap ouch double free Message-ID: <CADBMiEfM8qEQbRtb-egJjtQ0vhZ0CCMRS2YHbmz8A_k7AyZu_Q@mail.gmail.com> In-Reply-To: <CADBMiEd-X-pJ5yjhcxXK5Fo_EgWsMai0Um2HGffYzC_EnRUU3g@mail.gmail.com> References: <CADBMiEd-X-pJ5yjhcxXK5Fo_EgWsMai0Um2HGffYzC_EnRUU3g@mail.gmail.com>
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Hi,
I am currently playing with lb app in netmap. Every time I kill/close it,
the app hangs for some time and does not end immediately. In syslogs I am
getting:
'
Netmap_do_unregif deleting last instance for myapp{1
Netmap_do_deref active=5
Netnap_obj_free ouch, double free on buffer 27777
Netmap_extra_free freed 0 buffers
'
This happens when I have some consumer on the pipe and at some point during
whole lb lifetime, it did not consume all packets (resulting in oq being
filled or packets being dropped). If the pipe did not ever have a consumer,
then it will not end up in the double free.
I am finding it quite hard to debug in gdb, as this is happening at the
shutdown.
Could someone pls point me to reason?
I am running lb with one interface and 2 groups, different numb of pipes
per group and this happens even with no extra buffers.
Martina
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