* Re: ARC AXS101 problems with linux next-20151221
[not found] <56784531.1000007@synopsys.com>
@ 2015-12-23 11:14 ` Vineet Gupta
0 siblings, 0 replies; only message in thread
From: Vineet Gupta @ 2015-12-23 11:14 UTC (permalink / raw)
To: Christoph Hellwig
Cc: Carlos Palminha, linux-snps-arc@lists.infradead.org,
linux-mm@kvack.org, Alexey Brodkin, lkml, Andrew Morton
Hi Christoph, Andrew
> On Tuesday 22 December 2015 12:00 AM, Carlos Palminha wrote:
> Hi guys,
>
> I just compiled the kernel for axs101_defconfig based on linux next tag 'next-20151221'.
> I can't boot it due to the following errors causing strange stack traces after freeing unused kernel memory (check log below).
>
> Any clue?
> Do you more info to understand the issue?
....[snip]
> dw_mmc e0015000.mmc: IDMAC supports 32-bit address mode.
> dw_mmc e0015000.mmc: Using internal DMA controller.
> dw_mmc e0015000.mmc: Version ID is 270a
> dw_mmc e0015000.mmc: DW MMC controller at irq 34,32 bit host data width,16 deep fifo
> dw_mmc e0015000.mmc: 1 slots initialized
> sdhci-pltfm: SDHCI platform and OF driver helper
> usbcore: registered new interface driver usbhid
> usbhid: USB HID core driver
> NET: Registered protocol family 17
> NET: Registered protocol family 15
> ttyS3 - failed to request DMA
> Freeing unused kernel memory: 928K (80002000 - 800ea000)
> INFO: rcu_preempt self-detected stall on CPU
> 0-...: (2100 ticks this GP) idle=011/140000000000001/0 softirq=92/92 fqs=0
> (t=2100 jiffies g=-261 c=-262 q=60)
> rcu_preempt kthread starved for 2100 jiffies! g4294967035 c4294967034 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x1
> rcu_preempt S 8053879e 0 7 2 0x00000000
>
> Stack Trace:
> __switch_to+0x0/0x94
> __schedule+0x1c2/0x724
> schedule+0x2a/0x74
> schedule_timeout+0x126/0x198
> rcu_gp_kthread+0x5fa/0xee8
> kthread+0xe2/0xf4
> ret_from_fork+0x18/0x1c
> Task dump for CPU 0:
> kworker/0:1 R running 0 19 2 0x00000008
> Workqueue: events_freezable mmc_rescan
[snip]
It seems the dma ops rework for ARC makes kernel belly up.
Patch below fixes it.
------------->
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