On Thu, 2010-01-28 at 02:20 -0500, Jon Masters wrote: > On Thu, 2010-01-28 at 00:46 -0500, Jon Masters wrote: > > > A number of people seem to have reported this crash in various forms, > > but I have yet to see a solution, and can reproduce on 2.6.33-rc5 this > > evening so I know it's still present in the latest upstream kernels too. > > Userspace is Fedora 12, and this happens on both all recent F12 kernels > > (sporadic in 2.6.31 until recently, solidly reproducible on 2.6.32) and > > upstream 2.6.32, and 2.6.33-rc5 also - hard to find a "known good". > > > > The problem happens when using netfilter with KVM (problem does not > > occur without the firewall loaded, for example) and will occur within a > > few minutes of attempting to start or stop a guest that is connecting to > > the network - the easiest way to reproduce so far is simply to start up > > a bunch of Fedora guests and have them do a "yum update" cycle. > > > > All of the crashes appear similar to the following (2.6.33-rc5): > > Rebuilt the kernel with all debug options turned on, got some lockdep > warnings (haven't looked further yet). Here's the output (attached full > boot log also): > [ 339.730086] RIP: 0010:[<ffffffff813e5f3e>] [<ffffffff813e5f3e>] > nf_ct_remove_expectations+0x49/0x5c This appears to be in the hlist_for_each_entry_safe iteration within nf_ct_remove_expectations, iterating over the list of nf_conn_help(ers) returned by nfct_help. I don't know what that code does (I have an idea but only at a high level at this stage), though I'm poking a little here to see if I can understand enough of netfilter to be useful. Feel free to give me some pointers to help you guys debug this faster. Jon. -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
