Re: Issue booting Niagara T1 after commit 87fa05aeb3

["Raúl Porcel" <armin76@gentoo.org>]

Same here, I tried with the default config.

On 11/19/13 13:21, Fabio M. Di Nitto wrote:
> Hi all,
> 
> yes I know.. vintage hardware :) It´s running Debian unstable updated to
> approx a week ago (yay for tons of rebuilds to bisect ;)).
> 
> fabbione@sunfire:~/linux-2.6$ gcc --version
> gcc (Debian 4.6.4-5) 4.6.4
> 
> kernel config is from debian, applied to the various bisect done on
> Linus tree.
> 
> sunfire:~# cat /proc/cpuinfo
> cpu             : UltraSparc T1 (Niagara)
> fpu             : UltraSparc T1 integrated FPU
> pmu             : niagara
> prom            : OBP 4.28.9 2008/06/30 21:26
> type            : sun4v
> ncpus probed    : 24
> ..
> 
> commit 87fa05aeb3a5e8e21b1a5510eef6983650eff092
> Author: Sam Ravnborg <sam@ravnborg.org>
> Date:   Thu Apr 11 21:38:50 2013 +0200
> 
>     sparc: Use generic idle loop
> 
>     Add generic cpu_idle support
> 
> appears to be culprit and I can´t boot any kernel after that. Reverting
> the commit makes the machine boot again (tested up to commit 4fbf888acc
> from Linus tree).
> 
> Sorry I really don´t know that part of the code well enough to propose a
> fix, but I can either provide access to the machine or test debugging
> patches.
> 
> Thanks
> Fabio
> 
> Few extra info:
> 
> with this commit applied (head to the commit):
> 
> [SNIP]
> [   68.089495] scsi0 : Emulex LPe1150 PCIe Fibre Channel Adapter  on PCI
> bus 08 device 00 irq 23
> [   68.089495] scsi0 : Emulex LPe1150 PCIe Fibre Channel Adapter  on PCI
> bus 08 device 00 irq 23
> [   89.429041] INFO: rcu_sched detected stalls on CPUs/tasks:[
> 89.429041] INFO: rcu_sched detected stalls on CPUs/tasks: { { 3 3 10 10
> 15 15} } (detected by 0, tS42 jiffies, g\x18446744073709551328,
> c\x18446744073709551327, q!64)
> (detected by 0, tS42 jiffies, g\x18446744073709551328,
> c\x18446744073709551327, q!64)
> [   89.431437] * CPU[  0]: TSTATE[0000000080001603]
> TPC[000000000042b9d4] TNPC[000000000042b9d8] TASK[swapper/0:0]
> [   89.431437] * CPU[  0]: TSTATE[0000000080001603]
> TPC[000000000042b9d4] TNPC[000000000042b9d8] TASK[swapper/0:0]
> [   89.431462] BUG: soft lockup - CPU#3 stuck for 23s! [swapper/3:0]
> [   89.431462] BUG: soft lockup - CPU#3 stuck for 23s! [swapper/3:0]
> [   89.431470] BUG: soft lockup - CPU#1 stuck for 23s! [swapper/1:0]
> [   89.431470] BUG: soft lockup - CPU#1 stuck for 23s! [swapper/1:0]
> [   89.431479] BUG: soft lockup - CPU#2 stuck for 23s! [swapper/2:0]
> [   89.431479] BUG: soft lockup - CPU#2 stuck for 23s! [swapper/2:0]
> [   89.431484] Modules linked in:
> [SNIP]
> 
> Most kernels in between that commit to 3.12:
> 
> [SNIP]
> [   68.392210] UDP hash table entries: 4096 (order: 4, 131072 bytes)
> [   68.393319] UDP-Lite hash table entries: 4096 (order: 4, 131072 bytes)
> [   68.395425] NET: Registered protocol family 1
> [   68.396008] pci 0001:05:02.0: Activating ISA DMA hang workarounds
> -- no more output --
> 
> With Linus tree up to commit 4fbf888accb39 (didn´t test yet newer trees):
> 
> [   60.770765] scsi2 : Emulex LPe1150 PCIe Fibre Channel Adapter  on PCI
> bus 08 device 00 irq 23
>  [   81.923914] INFO: rcu_sched detected stalls on CPUs/tasks: {}
> (detected by 4, tR92 jiffies, g\x18446744073709551336,
> c\x18446744073709551335,5)
> [   81.924215] INFO: Stall ended before state dump start
> [  145.419184] INFO: rcu_sched detected stalls on CPUs/tasks: {}
> (detected by 0, t!166 jiffies, g\x18446744073709551336,
> c\x18446744073709551335,7)
> [  145.419482] INFO: Stall ended before state dump start
> 
> 
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