* Freeze on ppc32 MPC8248 board with 5.2 kernel
@ 2019-07-25 22:30 Doug Crawford
2019-08-13 4:41 ` Christophe Leroy
0 siblings, 1 reply; 2+ messages in thread
From: Doug Crawford @ 2019-07-25 22:30 UTC (permalink / raw)
To: linuxppc-dev
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We have a ppc32 MPC8248 board that is working perfectly with the 4.19
kernel.
We have noticed two issues with the 5.2 kernel:
1) If the new CONFIG_PPC_KUAP (kernel userspace access protection) is
enabled the kernel freezes right after initializing all the drivers and
just before starting /sbin/init.
2) If CONFIG_PPC_KUAP is disabled the system starts up, but any user space
program will hang indefinitely after calling the GCC atomic
"__sync_bool_compare_and_swap". This happens when nginx starts. The same
nginx binary works fine on a 4.19 kernel.
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Freeze on ppc32 MPC8248 board with 5.2 kernel
2019-07-25 22:30 Freeze on ppc32 MPC8248 board with 5.2 kernel Doug Crawford
@ 2019-08-13 4:41 ` Christophe Leroy
0 siblings, 0 replies; 2+ messages in thread
From: Christophe Leroy @ 2019-08-13 4:41 UTC (permalink / raw)
To: Doug Crawford, linuxppc-dev
Hi Doug,
Le 26/07/2019 à 00:30, Doug Crawford a écrit :
> We have a ppc32 MPC8248 board that is working perfectly with the 4.19
> kernel.
> We have noticed two issues with the 5.2 kernel:
Have you tried 5.0 and 5.1 ?
>
> 1) If the new CONFIG_PPC_KUAP (kernel userspace access protection) is
> enabled the kernel freezes right after initializing all the drivers and
> just before starting /sbin/init.
Can you provide your .config ?
Can you also provide the output of the boot console ?
>
> 2) If CONFIG_PPC_KUAP is disabled the system starts up, but any user
> space program will hang indefinitely after calling the GCC atomic
> "__sync_bool_compare_and_swap". This happens when nginx starts. The
> same nginx binary works fine on a 4.19 kernel.
Can you provide 'dmesg' ?
What version of GCC do you use ?
Have you tried a simple program doing nothing else than
__sync_bool_compare_and_swap() ?
Can you provide a disassembly of the function that uses
__sync_bool_compare_and_swap() ?
Thanks
Christophe
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