[FSL P50x0] Xorg always restarts again and again after the the PowerPC updates 5.13-1

[Christophe Leroy]

Le 04/05/2021 à 00:25, Christian Zigotzky a écrit :
> Hello,
> 
> Xorg always restarts again and again after the the PowerPC updates 5.13-1 [1] on my FSL P5040 Cyrus+ 
> board (A-EON AmigaOne X5000) [2]. Xorg doesn't start anymore in a virtual e5500 QEMU machine [3].
> 
> I bisected today [4].
> 
> Result: powerpc/signal32: Convert do_setcontext[_tm]() to user access block 
> (887f3ceb51cd34109ac17bfc98695162e299e657) [5] is the first bad commit.
> 
> Please find attached the kernel config.
> 
> Please check the first bad commit.

I'm not sure you can conclude anything here. There is a problem in that commit, but it is fixed by 
525642624783 ("powerpc/signal32: Fix erroneous SIGSEGV on RT signal return") which is the last 
commit of powerpc-5.13-1.

So any bisect from there will for sure point to 887f3ceb51cd ("powerpc/signal32: Convert 
do_setcontext[_tm]() to user access block") but that's unconclusive. If the problem is still there 
at the HEAD of powerpc-5.13-1, the problem is likely somewhere else.

I think you need to do the bisect again with a cherry-pick of 525642624783 at each step.

Thanks
Christophe


> 
> Thanks,
> Christian
> 
> [1] 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c70a4be130de333ea079c59da41cc959712bb01c 
> 
> [2] http://wiki.amiga.org/index.php?title=X5000
> [3] qemu-system-ppc64 -M ppce500 -cpu e5500 -m 1024 -kernel uImage -drive 
> format=raw,file=fedora28-2.img,index=0,if=virtio -netdev user,id=mynet0 -device 
> virtio-net-pci,netdev=mynet0 -append "rw root=/dev/vda" -device virtio-vga -usb -device 
> usb-ehci,id=ehci -device usb-tablet -device virtio-keyboard-pci -smp 4 -vnc :1
> [4] https://forum.hyperion-entertainment.com/viewtopic.php?p=53101#p53101
> [5] 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=887f3ceb51cd34109ac17bfc98695162e299e657 
>