Messages in this thread | | | Date | Thu, 21 Jan 2010 07:18:05 -0800 | From | Greg KH <> | Subject | Re: [regression]: soft lockup in dmesg after suspend/resume |
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On Mon, Jan 04, 2010 at 01:36:50PM +0800, ykzhao wrote: > Hi, > My box can work well before suspend/resume. But it will complain the > following warning message after suspend/resume. > >[1266874868.022103] Enabling non-boot CPUs ... > [1266874868.022198] BUG: soft lockup - CPU#0 stuck for 0s! [kthreadd:2] > > At the same time after I add the boot option of "printk.time=1", I > find that the log time is changed spontaneously from 76 to 1266874868. > > [ 76.475266] CPU3 is down > [ 76.475312] Extended CMOS year: 2000 > [1266874868.020631] x86 PAT enabled: cpu 0, old 0x7040600070406, new > 0x7010600070106 > [1266874868.021779] Back to C! > [1266874868.022003] CPU0: Thermal LVT vector (0xfa) already installed > [1266874868.022060] Extended CMOS year: 2000 > > More detailed info can be found in the attached file of > dmesg_after_origin. > > After I look at the source code, I find that on this box the TSC runs > at constant rate with P/T states and does not stop in deep C-states. And > then the sched_clock_stable is set to 1. In such case the TSC time is > used directly in the function of sched_clock_cpu. > > Then I do another test on this box, in which the clock_stable flag is > saved/restored in course of suspend/resume(I add this by using per-cpu > structure). When entering the suspended state, the clock_stable will be > cleared. And when the system is resumed, the clock_stable will be set > again. But unfortunately the soft lockup still exists. The file of > dmesg_after_test2 is the dmesg log after I save/restore the clock_stable > flag in course of suspend/resume. > > How about clearing the sched_clock_stable flag even when TSC doesn't > stop in deep C-state? From my test it seems that the TSC value is > unknown after doing suspend/resume.
I'm seeing this as well (Ingo, sorry for not searching more in the archives before sending my other message.)
Any ideas on what I can do here?
Yes, the clock changes a bunch on resume, that's natural, we should be able to handle this properly, right?
thanks,
greg k-h
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