mainline/master bisection: baseline.login on odroid-xu3
Russell King (Oracle)
linux at armlinux.org.uk
Sun Apr 17 14:37:49 PDT 2022
On Sun, Apr 17, 2022 at 10:27:58PM +0100, Russell King (Oracle) wrote:
> On Sun, Apr 17, 2022 at 08:35:29PM +0100, Mark Brown wrote:
> > On Sun, Apr 17, 2022 at 04:59:47AM -0700, KernelCI bot wrote:
> >
> > The KernelCI bisection bot found a boot regression on Odroid-XU3 with
> > commit 8d9d651ff2270 (ARM: use LOADADDR() to get load address of
> > section). It appears to trigger a deadlock somehow at some point after
> > the secondary CPUs come up:
>
> If the primary CPU is still happy, then the secondary CPUs should be.
> Quite simply, if something is broken in the setup of the vectors, the
> primary CPU would also be affected by this commit. However...
>
> > <6>[ 0.133301] smp: Bringing up secondary CPUs ...
> > <6>[ 0.138439] CPU1: thread -1, cpu 1, socket 1, mpidr 80000101
> > <6>[ 0.139400] CPU2: thread -1, cpu 2, socket 1, mpidr 80000102
> > <6>[ 0.140325] CPU3: thread -1, cpu 3, socket 1, mpidr 80000103
> > <6>[ 0.141167] CPU4: thread -1, cpu 0, socket 0, mpidr 80000000
> > <6>[ 0.141185] CPU4: Spectre v2: using ICIALLU workaround
> > <6>[ 0.168676] CPU4: Spectre BHB: using loop workaround
>
> Given that there was a problem with the loop implementation, please
> ensure that when you bisect, you have the following commit in place
> every time you test a bisect point:
>
> 6c7cb60bff7a ("ARM: fix Thumb2 regression with Spectre BHB")
>
> Otherwise, yes, it is known that Thumb2 will be broken.
Also, I should say, if this commit is really the case:
8d9d651ff227 ("ARM: use LOADADDR() to get load address of sections")
then I need to see two vmlinux binaries (the decompressed kernel ELF
image) for analysis of why this commit is causing the failure.
Basically, I need to disassemble the code and see what the toolchain
is doing to screw up the kernel.
If it isn't obvious from that, then I have no idea why this commit
would cause such a strange regression.
--
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