Linux kernel 3.x problems on PowerMac G5

Phileas Fogg phileas-fogg at
Sun Mar 3 23:48:42 EST 2013

Benjamin Herrenschmidt wrote:
> On Sat, 2013-03-02 at 15:40 +0100, Phileas Fogg wrote:
>> recently i got a PowerMac G5 and installed Debian Linux 2.6.32 on it.
>> Everything works so far and Debian boots properly.
>> Today i tried to boot Linux 3 on the machine and it doesn't boot.
>> The Linux 3 kernel was cross-compiled by me.
>> On Linux 3.8.1 it hangs after this line:
>> ---
>> windfarm: Drive bay control loop started.
>> And then i'm getting RCU stall call traces.
>> On Linux 3.2 it hangs too but not at the same place.
>> It hangs after some SCSI message.
>> Have anyone tested Linux 3 kernels on PowerMac G5 recently ?
> Hrm, this is odd. I do run pretty much every release on my G5's without
> problems... Can you send me your .config and then try with a
> g5_defconfig just to see if it makes a difference ?
> There *might* have been a problem on those older machines vs. the 64T
> address space patches, so maybe try back 3.6 and 3.7 and let me know,
> I'm still trying to get the right fix in (I know it breaks PS/3 under
> some circumstances).
> Cheers,
> Ben.

Reverted 64TB commit on Linux 3.8.1 and it didn't help, it still hangs.

Here is the RCU stall call trace:

BUG - soft lockup - CPU#1 stuck for 23s
Call trace:

Exception at kernel_execve
LR = run_init_process


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