lkml.org 
[lkml]   [2013]   [Oct]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [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/

    \
     
     \ /
      Last update: 2013-10-28 17:21    [W:6.806 / U:0.008 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site