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Date: Sun, 1 Aug 2021 11:39:07 +1000 (AEST) From: Finn Thain <fthain@...ux-m68k.org> To: Christophe Leroy <christophe.leroy@...roup.eu> cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org, Nick Piggin <npiggin@...il.com>, Michael Ellerman <mpe@...erman.id.au>, Paul Mackerras <paulus@...ba.org>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Stan Johnson <userm57@...oo.com> Subject: Re: [PATCH v3 31/41] powerpc/32: Dismantle EXC_XFER_STD/LITE/TEMPLATE 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@...nkPad) (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@...nkPad) (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@...nkPad) (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@...nkPad) (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@...nkPad) (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@...nkPad) (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 View attachment "WS-1-dmesg" of type "text/plain" (60788 bytes) View attachment "WS-2-dmesg" of type "text/plain" (66122 bytes)
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