Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 28 Oct 2013 16:45:09 +0100 | From | Knut Petersen <> | Subject | Re: [BUG 3.12.rc4] Oops: unable to handle kernel paging request during shutdown |
| |
On 28.10.2013 16:16, Ingo Molnar wrote: > * Ingo Molnar <mingo@kernel.org> wrote: > >>> I tried that patch, together with all the kobj debug options >>> enabled. With that kernel configuration I was unable to >>> reproduce the problem during 500 typical workload / reboot >>> cycles. Without the debug options I was able to reproduce the >>> last reported panic after 91 cycles. The debug options seem to >>> change timing sufficiently to mask the bug ;-( >> Could you send me the kernel config please? > I got your .config off-list, thanks Knut! > > It has all DEBUG_OBJECT options enabled: > > CONFIG_DEBUG_OBJECTS=y > # CONFIG_DEBUG_OBJECTS_SELFTEST is not set > CONFIG_DEBUG_OBJECTS_FREE=y > CONFIG_DEBUG_OBJECTS_TIMERS=y > CONFIG_DEBUG_OBJECTS_WORK=y > CONFIG_DEBUG_OBJECTS_RCU_HEAD=y > CONFIG_DEBUG_OBJECTS_PERCPU_COUNTER=y > CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT=1 > > but it also has DEBUG_PAGEALLOC enabled: > > CONFIG_DEBUG_PAGEALLOC=y > > I'd suggest disabling that one - it kind of overlaps debugobjects > and it will definitely be a big slowdown.
ACK > I'd also suggest turning off lockdep for now: > > CONFIG_PROVE_LOCKING=y > > because we know it does not trigger any useful warning. This too > should speed up things a bit.
Well, for now that´s true. On one machine it emits the old warning about the videobuf_dvb_find_frontend() / dvb_device_open() circular reference, but that´s definitely unrelated.
> > Whether this would make the crash reproducable again I don't know > :-/
We´ll see ;-) > Thanks, > > Ingo >
-- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| ![\](/images/icornerr.gif) |