* Re: next/master boot: 254 boots: 16 failed, 231 passed with 4 offline, 1 untried/unknown, 2 conflicts (next-20190726)
2019-07-26 13:48 ` next/master boot: 254 boots: 16 failed, 231 passed with 4 offline, 1 untried/unknown, 2 conflicts (next-20190726) Mark Brown
@ 2019-07-29 0:56 ` Bjorn Andersson
2019-08-19 4:35 ` Bjorn Andersson
1 sibling, 0 replies; 3+ messages in thread
From: Bjorn Andersson @ 2019-07-29 0:56 UTC (permalink / raw)
To: Mark Brown
Cc: Andy Gross, kernel-build-reports, linux-kernel, linux-arm-kernel,
linux-arm-msm
On Fri 26 Jul 06:48 PDT 2019, Mark Brown wrote:
> On Fri, Jul 26, 2019 at 05:18:01AM -0700, kernelci.org bot wrote:
>
> The past few versions of -next failed to boot on apq8096-db820c:
>
> > defconfig:
> > gcc-8:
> > apq8096-db820c: 1 failed lab
>
> with an RCU stall towards the end of boot:
>
> 00:03:40.521336 [ 18.487538] qcom_q6v5_pas adsp-pil: adsp-pil supply px not found, using dummy regulator
> 00:04:01.523104 [ 39.499613] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
> 00:04:01.533371 [ 39.499657] rcu: 2-...!: (0 ticks this GP) idle=9ca/1/0x4000000000000000 softirq=1450/1450 fqs=50
> 00:04:01.537544 [ 39.504689] (detected by 0, t=5252 jiffies, g=2425, q=619)
> 00:04:01.541727 [ 39.513539] Task dump for CPU 2:
> 00:04:01.547929 [ 39.519096] seq R running task 0 199 198 0x00000000
>
> Full details and logs at:
>
> https://kernelci.org/boot/id/5d3aa7ea59b5142ba868890f/
>
> The last version that worked was from the 15th and there seem to be
> similar issues in mainline since -rc1.
Thanks for the report Mark, afaict the problem showed up in v5.3-rc1 as
well.
I think the problem is that the regulator supplying the GPU power
domain(s) isn't enabled - and I think there's a lack of agreement of how
this should be controlled.
But we have a partial fix for this floating around, I will give it a
spin.
Regards,
Bjorn
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: next/master boot: 254 boots: 16 failed, 231 passed with 4 offline, 1 untried/unknown, 2 conflicts (next-20190726)
2019-07-26 13:48 ` next/master boot: 254 boots: 16 failed, 231 passed with 4 offline, 1 untried/unknown, 2 conflicts (next-20190726) Mark Brown
2019-07-29 0:56 ` Bjorn Andersson
@ 2019-08-19 4:35 ` Bjorn Andersson
1 sibling, 0 replies; 3+ messages in thread
From: Bjorn Andersson @ 2019-08-19 4:35 UTC (permalink / raw)
To: Mark Brown
Cc: Andy Gross, kernel-build-reports, linux-kernel, linux-arm-kernel,
linux-arm-msm
On Fri 26 Jul 06:48 PDT 2019, Mark Brown wrote:
> On Fri, Jul 26, 2019 at 05:18:01AM -0700, kernelci.org bot wrote:
>
> The past few versions of -next failed to boot on apq8096-db820c:
>
> > defconfig:
> > gcc-8:
> > apq8096-db820c: 1 failed lab
>
> with an RCU stall towards the end of boot:
>
> 00:03:40.521336 [ 18.487538] qcom_q6v5_pas adsp-pil: adsp-pil supply px not found, using dummy regulator
> 00:04:01.523104 [ 39.499613] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
> 00:04:01.533371 [ 39.499657] rcu: 2-...!: (0 ticks this GP) idle=9ca/1/0x4000000000000000 softirq=1450/1450 fqs=50
> 00:04:01.537544 [ 39.504689] (detected by 0, t=5252 jiffies, g=2425, q=619)
> 00:04:01.541727 [ 39.513539] Task dump for CPU 2:
> 00:04:01.547929 [ 39.519096] seq R running task 0 199 198 0x00000000
>
> Full details and logs at:
>
> https://kernelci.org/boot/id/5d3aa7ea59b5142ba868890f/
>
> The last version that worked was from the 15th and there seem to be
> similar issues in mainline since -rc1.
As you might have seen this problem has come and gone on the
apq8096-db820c and I've finally managed to narrow it down a little bit.
The problem first appears on next-20190701, with the introduction of
CONFIG_RANDOMIZE_BASE in the defconfig, but after further efforts I've
concluded that disabling kpti removes or hides the problem.
With kpti=no on the command line I've now successfully booted the db820c
100+ times without problems (a clear improvement from the 75% failure
rate with kpti=yes).
Unfortunately I'm not yet certain why this is causing issues and I'm
also seeing the same rcu stall on SDA845 under certain (erroneous?)
conditions (where I don't expect them).
Regards,
Bjorn
^ permalink raw reply [flat|nested] 3+ messages in thread