linux-kernel - Re: 2.6.30-rc2 soft lockups: ACPI? clock source problem?

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Date:	Thu, 23 Apr 2009 17:26:58 -0700
From:	Dave Hansen <dave@...1.net>
To:	john stultz <johnstul@...ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-acpi <linux-acpi@...r.kernel.org>, lenb@...nel.org
Subject: Re: 2.6.30-rc2 soft lockups: ACPI?  clock source problem?

As John suggested, booting with clocksource=acpi_pm works around the
issue.

I couldn't reproduce this at all when I boot with init=/bin/sh.  That
happens both on 2.6.30-rc2 and -rc3.

This actually happens relatively late in boot.  I also noticed that it
seems to always happen during the ACPI messages in that "power states"
area.  So, I tried booting to /bin/sh again, waiting a few seconds, and
doing 'modprobe processor'.  Bingo.  I got the trace right when I did
the modprobe.

It doesn't look like it comes from the prinks themselves though:

                printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id);
                for (i = 1; i <= pr->power.count; i++)
                        if (pr->power.states[i].valid)
                                printk(" C%d[C%d]", i,
                                       pr->power.states[i].type);
                printk(")\n");

Any ideas?

Apr 23 09:04:47 nimitz kernel: [   13.208679] sd 6:0:0:0: [sdc] Attached SCSI disk
Apr 23 09:04:47 nimitz kernel: [   13.653314] ACPI: SSDT bf6e1b32 002C4 (v01  PmRef  Cpu0Ist 00000100 INTL 20050513)
Apr 23 09:04:47 nimitz kernel: [   13.669448] ACPI: SSDT bf6e1e7b 0085E (v01  PmRef  Cpu0Cst 00000100 INTL 20050513)
Apr 23 09:04:47 nimitz kernel: [  299.093892] ACPI: CPU0 (power states:<3>BUG: soft lockup - CPU#1 stuck for 266s! [modprobe:3193]
Apr 23 09:04:47 nimitz kernel: [  299.100292] Modules linked in: button(+) processor(+) ohci1394 ieee1394 uhci_hcd ehci_hcd thermal fan fuse usb_storage usb_libusual usbcore
Apr 23 09:04:47 nimitz kernel: [  299.100302] 
Apr 23 09:04:47 nimitz kernel: [  299.100305] Pid: 3193, comm: modprobe Not tainted (2.6.30-rc3-dirty #327) 7659A71
Apr 23 09:04:47 nimitz kernel: [  299.100308] EIP: 0073:[<08049942>] EFLAGS: 00000246 CPU: 1
Apr 23 09:04:47 nimitz kernel: [  299.100311] EIP is at 0x8049942
Apr 23 09:04:47 nimitz kernel: [  299.100313] EAX: 0000006b EBX: 0000002f ECX: 0000006b EDX: 0804e198
Apr 23 09:04:47 nimitz kernel: [  299.100315] ESI: 0804e268 EDI: 000000a1 EBP: bf8f73b8 ESP: bf8f7390


-- Dave

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