Messages in this thread | | | Date | Mon, 11 Jul 2011 12:24:51 -0400 | From | Konrad Rzeszutek Wilk <> | Subject | Re: PROBLEM: 3.0-rc kernels unbootable since -rc3 |
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On Sun, Jul 10, 2011 at 04:14:49PM -0700, Paul E. McKenney wrote: > On Sun, Jul 10, 2011 at 10:50:48PM +0100, julie Sullivan wrote: > > > Very cool! Thank you very much for the testing -- .. snip.. > And here is what I am proposing sending upstream. I have your Tested-by,
Hey Paul,
I am hitting a similar bug. Starting udev Kernel Device Manager... Starting Configure read-only root support... [ 79.942067] INFO: rcu_sched_state detected stalls on CPUs/tasks: { 0} (detected by 2, t=60002 jiffies) [ 79.942089] sending NMI to all CPUs:
when running a 3.0-rc6 under Xen as 32-bit guest (I don't see this issue when running a 64-bit guest) and when I've more than two CPUs under the guest.
I've tried the patch below against 3.0-rc6 and it did not fix the issue.
I've also tried to use 3.0-rc3 as somewhere in thread one of the reporters mentioned that it worked for me - but that did not help me.
The config is a Fedora Core based. The stack traces of the four CPUs look as follow:
CPU0: Call Trace: [<c04023a7>] hypercall_page+0x3a7 <-- [<c0405ed5>] xen_safe_halt+0x12 [<c040ea08>] default_idle+0x5a [<c04081a6>] cpu_idle+0x8e [<c07da9a9>] rest_init+0x5d [<c0a86788>] start_kernel+0x34d [<c0a861c4>] unknown_bootoption [<c0a860ba>] i386_start_kernel+0xa9 [<c0a895ce>] xen_start_kernel+0x55d [<c04090b1>] sys_rt_sigreturn+0xb
CPU1 and CPU2: Call Trace: [<c04023a7>] hypercall_page+0x3a7 <-- [<c0405ed5>] xen_safe_halt+0x12 [<c040ea08>] default_idle+0x5a [<c04081a6>] cpu_idle+0x8e [<c07e5419>] cpu_bringup_and_idle+0xd
CPU3: Call Trace: [<c042d0f2>] task_waking_fair+0x11 <-- [<c0439a45>] try_to_wake_up+0xb2 [<c0439b0c>] default_wake_function+0x10 [<c042d4db>] __wake_up_common+0x3b [<c042ea69>] complete+0x3e [<c0455e14>] wakeme_after_rcu+0x10 [<c048fd58>] __rcu_process_callbacks+0x172 [<c049080f>] rcu_process_callbacks+0x20 [<c044567d>] __do_softirq+0xa2 [<c04455db>] __do_softirq [<c040a52d>] do_softirq+0x5a
The full config is http://darnok.org/xen/config-rcu-stall The full bootup log is http://darnok.org/xen/log-rcu-stall
Any thoughts of what I ought to try? I don't know if there is some missing functionality in the RCU patches to work under Xen.... Any older version of Linux kernel you would like me to try? -- 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/
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