On Thu, 16 Jul 2020 17:19:25 +0800, Qi Liu wrote:
> When users try to remove PMU modules during perf sampling, kernel panic
> will happen because the pmu->read() is a NULL pointer here.
>
> INFO on HiSilicon hip08 platform as follow:
> pc : hisi_uncore_pmu_event_update+0x30/0xa4 [hisi_uncore_pmu]
On 16/07/2020 11:44, Will Deacon wrote:
Please also note what Qi Liu wrote about being able to unbind the driver and
cause the same issue. I don't know if you can about that issue also.
I guess we have to throw in some '.suppress_bind_attrs = true,' lines as
well, then?
Yeah, I think it would
On Thu, Jul 16, 2020 at 11:36:10AM +0100, John Garry wrote:
> On 16/07/2020 11:30, Will Deacon wrote:
> > On Thu, Jul 16, 2020 at 11:26:25AM +0100, Robin Murphy wrote:
> > > On 2020-07-16 10:41, Will Deacon wrote:
> > > > On Thu, Jul 16, 2020 at 05:19:25PM +0800, Qi Liu wrote:
> > > > > Kernel pani
On 16/07/2020 11:30, Will Deacon wrote:
On Thu, Jul 16, 2020 at 11:26:25AM +0100, Robin Murphy wrote:
On 2020-07-16 10:41, Will Deacon wrote:
On Thu, Jul 16, 2020 at 05:19:25PM +0800, Qi Liu wrote:
Kernel panic will also happen when users try to unbind PMU drivers with
device. This unbind issu
On Thu, Jul 16, 2020 at 11:26:25AM +0100, Robin Murphy wrote:
> On 2020-07-16 10:41, Will Deacon wrote:
> > On Thu, Jul 16, 2020 at 05:19:25PM +0800, Qi Liu wrote:
> > > Kernel panic will also happen when users try to unbind PMU drivers with
> > > device. This unbind issue could be solved by anothe
On 2020-07-16 10:41, Will Deacon wrote:
On Thu, Jul 16, 2020 at 05:19:25PM +0800, Qi Liu wrote:
Kernel panic will also happen when users try to unbind PMU drivers with
device. This unbind issue could be solved by another patch latter.
drivers/perf/arm_smmuv3_pmu.c | 1 +
driv
On 16/07/2020 10:41, Will Deacon wrote:
On Thu, Jul 16, 2020 at 05:19:25PM +0800, Qi Liu wrote:
Kernel panic will also happen when users try to unbind PMU drivers with
device. This unbind issue could be solved by another patch latter.
drivers/perf/arm_smmuv3_pmu.c | 1 +
driv
On Thu, Jul 16, 2020 at 05:19:25PM +0800, Qi Liu wrote:
> Kernel panic will also happen when users try to unbind PMU drivers with
> device. This unbind issue could be solved by another patch latter.
>
> drivers/perf/arm_smmuv3_pmu.c | 1 +
> drivers/perf/fsl_imx8_ddr_perf.c
When users try to remove PMU modules during perf sampling, kernel panic
will happen because the pmu->read() is a NULL pointer here.
INFO on HiSilicon hip08 platform as follow:
pc : hisi_uncore_pmu_event_update+0x30/0xa4 [hisi_uncore_pmu]
lr : hisi_uncore_pmu_read+0x20/0x2c [hisi_uncore_pmu]
sp : f
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