On Thursday 07 Jul 2005 13:29, Ingo Molnar wrote: > * Alistair John Strachan <[EMAIL PROTECTED]> wrote: > > http://devzero.co.uk/~alistair/oops1.jpeg > > > > I disabled the trace and the STACKOVERFLOW option seems to help; I've > > got a (slightly truncated) oops from the kernel. What happens is that > > I get an oops, then I get a BUG: warning me about the softlock, then I > > get another oops. I'm about to reboot to confirm whether the second > > oops is identical to the first (I suspect that it is). > > unfortunately the EIP is at 0xedc, which is a corrupted value. The stack > trace portion that is visible on the screen is the usual pagefault trace > - without any information about the crash site itself. What the oops > tells us is that it's the openvpn process that crashed (if this was the > first oops). The preempt_count is 0x20010004, which shows us that this > was a section that had soft-IRQ-flags disabled and was in a hardirq > context. (see the meaning of the preempt bits at the top of > include/linux/hardirq.h) That it's a hardirq handler that crashed is > further corroborated by the esp, which points into a kernel data area > (hardirq_ctx[], the 4K irq stacks), not into the process's kernel stack > (which is at threadinfo). > > the stack pointer itself looks healthy, it's near the end of a 4K page, > i.e. far from overflowing. So it would be really useful to get the full > oops output. (that way you can also be sure it's the first crash you are > seeing.) > > (i doubt netconsole debugging will work, given that we are in a hardirq > context. Serial logging will work.) > > one thing you could try is to apply the attached patch and reproduce the > crash. It should print a pure backtrace and lock the box up afterwards, > so that you can take a picture.
Done, sorry for the delay. http://devzero.co.uk/~alistair/oops4.jpeg I don't think this is really any more helpful, the dereference is at "virtual address 00000001" which sounds fishy. -- Cheers, Alistair. personal: alistair()devzero!co!uk university: s0348365()sms!ed!ac!uk student: CS/CSim Undergraduate contact: 1F2 55 South Clerk Street, Edinburgh. EH8 9PP. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
