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    SubjectRe: [2.6.28-rc5] RCU detected CPU 0 stall (t=4294893165/750 jiffies)
    On Fri, Nov 21, 2008 at 10:45:53AM +0100, Folkert van Heusden wrote:
    > Hi,
    >
    > I'm afraid there's no script for that: it happens during boot.

    This is a HZ=250 machine, correct? If so, please try the following
    patch (already in -tip), which helps suppress boot-time false positives.

    Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    ---

    diff --git a/include/linux/rcuclassic.h b/include/linux/rcuclassic.h
    index 5f89b62..301dda8 100644
    --- a/include/linux/rcuclassic.h
    +++ b/include/linux/rcuclassic.h
    @@ -41,7 +41,7 @@
    #include <linux/seqlock.h>

    #ifdef CONFIG_RCU_CPU_STALL_DETECTOR
    -#define RCU_SECONDS_TILL_STALL_CHECK ( 3 * HZ) /* for rcp->jiffies_stall */
    +#define RCU_SECONDS_TILL_STALL_CHECK (10 * HZ) /* for rcp->jiffies_stall */
    #define RCU_SECONDS_TILL_STALL_RECHECK (30 * HZ) /* for rcp->jiffies_stall */
    #endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */

    > On Fri, Nov 21, 2008 at 05:30:12PM +0800, Lai Jiangshan wrote:
    > > Hi, Folkert van Heusden,
    > >
    > > Can you tell me how can I reproduce this bug.
    > >
    > > Thanx, Lai
    > >
    > > Folkert van Heusden wrote:
    > > > During the boot-process of a 2.6.28-RC5 kernel I got the followin on
    > > > the console:
    > > >
    > > > - [ 3.479998] RCU detected CPU 0 stall (t=4294893165/750 jiffies)
    > > > ! [ 3.480004] Pid: 1, comm: swapper Not tainted 2.6.28-rc5-custom2 #1
    > > > ! [ 3.480004] Call Trace:
    > > > ! [ 3.480004] [<c0300c33>] ? printk+0xf/0x14
    > > > ! [ 3.480004] [<c0166f15>] __rcu_pending+0x53/0x189
    > > > ! [ 3.480004] [<c0167067>] rcu_pending+0x1c/0x47
    > > > ! [ 3.480004] [<c0132aa4>] update_process_times+0x2b/0x4e
    > > > ! [ 3.480004] [<c0144c8d>] tick_sched_timer+0x6d/0x9b
    > > > ! [ 3.480004] [<c0144c20>] ? tick_sched_timer+0x0/0x9b
    > > > ! [ 3.480004] [<c013e0cc>] __run_hrtimer+0x60/0x97
    > > > ! [ 3.480004] [<c013eb35>] hrtimer_interrupt+0xfe/0x166
    > > > ! [ 3.480004] [<c0112eea>] smp_apic_timer_interrupt+0x6c/0x7f
    > > > ! [ 3.480004] [<c0104829>] apic_timer_interrupt+0x2d/0x34
    > > > ! [ 3.480004] [<c043c454>] ? inflate_codes+0x272/0x3bc
    > > > ! [ 3.480004] [<c043cf22>] inflate_dynamic+0x4c0/0x4f0
    > > > ! [ 3.480004] [<c043d775>] unpack_to_rootfs+0x524/0x975
    > > > ! [ 3.480004] [<c0147eaf>] ? debug_check_no_locks_freed+0x1a/0x123
    > > > ! [ 3.480004] [<c043e202>] ? populate_rootfs+0x0/0xcd
    > > > ! [ 3.480004] [<c043e202>] ? populate_rootfs+0x0/0xcd
    > > > ! [ 3.480004] [<c043e278>] populate_rootfs+0x76/0xcd
    > > > ! [ 3.480004] [<c0101130>] _stext+0x48/0x11e
    > > > ! [ 3.480004] [<c0206830>] ? ida_get_new_above+0x157/0x171
    > > > ! [ 3.480004] [<c0218a08>] ? _raw_spin_lock+0x53/0xfa
    > > > ! [ 3.480004] [<c02189b1>] ? _raw_spin_unlock+0x74/0x78
    > > > ! [ 3.480004] [<c0303759>] ? _spin_unlock+0x1d/0x20
    > > > ! [ 3.480004] [<c01c1ab1>] ? proc_register+0x146/0x157
    > > > ! [ 3.480004] [<c01c1bda>] ? create_proc_entry+0x7b/0x91
    > > > ! [ 3.480004] [<c0166600>] ? register_irq_proc+0x7b/0x9b
    > > > ! [ 3.480004] [<c0166666>] ? init_irq_proc+0x46/0x59
    > > > ! [ 3.480004] [<c04392ee>] kernel_init+0x102/0x150
    > > > ! [ 3.480004] [<c04391ec>] ? kernel_init+0x0/0x150
    > > > ! [ 3.480004] [<c0104987>] kernel_thread_helper+0x7/0x10
    > > > + [ 4.773412] Freeing initrd memory: 53252k freed
    > > >
    > > > This is a P4 with hyperthreading. 0.5GB ram. IDE disk.
    > > >
    > > >
    > > > Folkert van Heusden
    > > >
    > >
    > >
    > > --
    > > 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/
    >
    >
    > Folkert van Heusden
    >
    > --
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