On Sat, 31 Jul 2021, Christophe Leroy wrote:

> > We found that reducing memory with the kernel parameter 'mem=464M' 
> > would prevent the crash.
> > 
> > Below are Stan's notes from the 'git bisect' run. They include an 
> > additional failure mode that might be of interest. We've also observed 
> > "Kernel attempted to write user page (c6207c) - exploit attempt?" and 
> > "kernel BUG at arch/powerpc/kernel/interrupt.c:49!".
> > 
> 
> Interesting.  Can you provide detailed log of thoose two BUGs ?
> 

I've attached the dmesg output which Stan sent me a few days ago. It 
contains results for 3 different builds run on two different machines 
(Wallstreet-1 and Wallstreet-2).

$ grep Linux.version WS-1-dmesg
[    0.000000] Linux version 5.12.0-pmac (johnson@ThinkPad) (powerpc-linux-gnu-gcc (Debian 8.3.0-2) 8.3.0, GNU ld (GNU Binutils for Debian) 2.31.1) #6 SMP Sat Jul 24 11:49:36 MDT 2021
[    0.000000] Linux version 5.13.0-pmac (johnson@ThinkPad) (powerpc-linux-gnu-gcc (Debian 8.3.0-2) 8.3.0, GNU ld (GNU Binutils for Debian) 2.31.1) #5 SMP Sat Jul 24 11:00:06 MDT 2021
[    0.000000] Linux version 5.14.0-rc2-pmac-00323-gd8079fac1681 (johnson@ThinkPad) (powerpc-linux-gnu-gcc (Debian 8.3.0-2) 8.3.0, GNU ld (GNU Binutils for Debian) 2.31.1) #7 SMP Sun Jul 25 09:14:32 MDT 2021

$ grep Linux.version WS-2-dmesg
[    0.000000] Linux version 5.12.0-pmac (johnson@ThinkPad) (powerpc-linux-gnu-gcc (Debian 8.3.0-2) 8.3.0, GNU ld (GNU Binutils for Debian) 2.31.1) #6 SMP Sat Jul 24 11:49:36 MDT 2021
[    0.000000] Linux version 5.13.0-pmac (johnson@ThinkPad) (powerpc-linux-gnu-gcc (Debian 8.3.0-2) 8.3.0, GNU ld (GNU Binutils for Debian) 2.31.1) #5 SMP Sat Jul 24 11:00:06 MDT 2021
[    0.000000] Linux version 5.14.0-rc2-pmac-00323-gd8079fac1681 (johnson@ThinkPad) (powerpc-linux-gnu-gcc (Debian 8.3.0-2) 8.3.0, GNU ld (GNU Binutils for Debian) 2.31.1) #7 SMP Sun Jul 25 09:14:32 MDT 2021