On Thu, May 02, 2013 at 12:25:08PM +0100, Robert N. M. Watson wrote: > > On 2 May 2013, at 11:42, Glen Barber wrote: > > > Hmm. Perhaps it would be worthwhile for me to rebuild the current > > kernel with DDB support. It looks like the machine has panicked a few > > times over the last two weeks or so, but based on the timestamps of the > > crash dumps and nagios complaints, happened during the middle of the > > night when I would not have really noticed, or otherwise would have just > > blamed my ISP. > > > > Two of the panics are ath(4) related. One looks similar to the one > > referenced in this thread, similarly triggered by a CFEngine process. > > > > In that case, the backtrace looks like: > > > > #4 0xffffffff808cdbb3 at calltrap+0x8 > > #5 0xffffffff807371d8 at in_pcb_lport+0x128 > > #6 0xffffffff8073745a at in_pcbbind_setup+0x16a > > #7 0xffffffff80737d8e at in_pcbconnect_setup+0x71e > > #8 0xffffffff80737df9 at in_pcbconnect_mbuf+0x59 > > #9 0xffffffff807bf29f at udp_connect+0x11f > > #10 0xffffffff80680615 at kern_connectat+0x275 > > > > Regarding DDB though, it would be rather difficult to access the machine > > if it drops to a DDB debugger session, since the machine acts as my > > firewall. > > Thanks -- will take a look at the attached. > > FWIW, though, I'm worried by the number of panics you are seeing, > especially given that they involve multiple subsystems, and in > particular, John's observation about a potentially corrupted pointer. > This makes me wonder whether (a) you are experiencing hardware > faults -- it would be worth running some memory/cpu/etc tests and > (b) if we might be seeing a software memory corruption bug of some > sort. > I will run memtest this weekend, once I move some wires around so I do not lose internet access entirely. I'll run some stress tests that do not require the machine to be offline in the meantime. I certainly won't discount hardware issue being the cause. For what it is worth, I just looked through my svn commit logs for that machine's configuration, and the only relatively recent change that was made was enabling powerd(8) - but that was about 3 months ago. Glen
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