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    SubjectRe: Mysterious CFQ crash and RCU
    On Thu, Jun 02, 2011 at 10:07:24PM -0700, Paul E. McKenney wrote:

    > > Thu May 26 10:47:20 CEST 2011
    > > /sys/kernel/debug/rcu/rcugp:
    > > rcu_sched: completed=682249 gpnum=682250
    > 15 more seconds, a few thousand more grace periods. About 500 grace
    > periods per second, which is quite reasonable on a single-CPU system.

    PaulB mentioned that crash happened at May 26 10:47:07. I am wondering
    how are we able to sample the data after the crash. I am assuming
    that above data gives information only before crash and does not
    tell us anything about what happened just before crash. What am I missing.

    PaulM, in one of the mails you had mentioned that one could print
    context switch id to make sure we did not block in rcu section. Would
    you have quick pointer where is context switch id stored. May be
    I can write a small patch for PaulB.


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