BUG: crash in __tlb_remove_page_size with STRICT_KERNEL_RWX on BOOK3S_32
Christophe Leroy
christophe.leroy at c-s.fr
Fri Apr 26 17:27:55 AEST 2019
Le 26/04/2019 à 06:54, Serge Belyshev a écrit :
> Hi! Commit 63b2bc61956 aka "powerpc/mm/32s: Use BATs for STRICT_KERNEL_RWX"
> caused my old powerbook to crash under I/O. After "dd if=/dev/hda of=/null"
> the crash happens in seconds. Reverting the commit helps, as well as
> disabling STRICT_KERNEL_RWX. Unfortunately, I was unable to capture the oops
> via the usb serial console, as it stuck right after the first "BUG: Unable to
> handle kernel data access at 0xe0c29000" message. Oops screenshot:
> http://aargh.no-ip.org/oops.jpg
>
Hi Serge,
Could you please compile your kernel with CONFIG_PPC_PTDUMP, and provide
the content of:
/sys/kernel/debug/kernel_page_tables
/sys/kernel/debug/powerpc/block_address_translation
/sys/kernel/debug/powerpc/segment_registers
Please also provide the begining of 'dmesg' that shows the memory layout.
Thanks
Christophe
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