Hi Dave, Thanks for the patch. I merged your edits and compiled a debug version using stable/1908 as base.
Every time a make a ping request from a LAN device, VPP is restarting. Sometimes vppctl just hangs, but when I do get into vppctl, if I run a command (ex: sh nat44 address), VPP again restarts. I know this information is not that helpful. Please let me know what information you need and, I can also run more tests. Thanks! On Thu, Aug 15, 2019 at 12:20 PM Dave Barach via Lists.Fd.Io <dbarach=cisco....@lists.fd.io> wrote: > > See https://jira.fd.io/browse/VPP-1746, and > https://gerrit.fd.io/r/c/vpp/+/21338 which fixes gross non-operation of the > name resolver. > > > > Process created on demand, with node index in the main_t. Needed to remove > the static vlib_node_registration_t and use dm->resolver_process_node_index > vs. unused_mumble_registration.node_index. > > > > Passing 0 when signaling name resolution events couldn’t possibly work. > > > > D. > > > > From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of Dave Barach via > Lists.Fd.Io > Sent: Thursday, August 15, 2019 2:54 PM > To: anoopnairh...@gmail.com; vpp-dev@lists.fd.io > Cc: vpp-dev@lists.fd.io > Subject: Re: [vpp-dev] Crash when using dns_name_server > > > > Folks, > > > > I’ll look at these issues. It would be helpful if people would contribute > patches, or at least write Jira tickets. If we don’t know it’s broken, it > won’t get fixed... > > > > To level-set: the DNS name resolver has been lightly used. Nothing would > surprise me at this point. > > > > D. > > > > From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of > anoopnairh...@gmail.com > Sent: Thursday, August 15, 2019 1:07 PM > To: vpp-dev@lists.fd.io > Subject: Re: [vpp-dev] Crash when using dns_name_server > > > > Hi Carlio, > I had faced a similar crash with DNS module while resolving names. > > The dns_cache_lock is in locked state after initialization. Because of this > the first worker thread which attempts to take this lock will find it in > "locked" state and spin forever. So the main thread panics when it tries for > barrier sync. Attached the patch which solved my problem > > I could find couple of other issues in the DNS module and the patch has the > fix for them as well. > > - DNS lock is not released while processing dns request -> causes deadlock > > - resolve a name from VAT when there is no server configured -> crash > due to a NULL pointer deference > > - delete_random_entry() is invoked while holding DNS lock -> a potential > deadlock > > Please check if it helps you. > > thanks > Anoop > > -=-=-=-=-=-=-=-=-=-=-=- > Links: You receive all messages sent to this group. > > View/Reply Online (#13754): https://lists.fd.io/g/vpp-dev/message/13754 > Mute This Topic: https://lists.fd.io/mt/32881233/675621 > Group Owner: vpp-dev+ow...@lists.fd.io > Unsubscribe: https://lists.fd.io/g/vpp-dev/unsub [carlitonu...@gmail.com] > -=-=-=-=-=-=-=-=-=-=-=-
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