linux-kernel - Re: [GIT PULL] MIPS fixes for v6.18

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Message-ID: <aSTI7RHnKXkoxWw-@alpha.franken.de>
Date: Mon, 24 Nov 2025 22:06:53 +0100
From: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To: Gregory CLEMENT <gregory.clement@...tlin.com>
Cc: torvalds@...ux-foundation.org, linux-mips@...r.kernel.org,
	linux-kernel@...r.kernel.org, macro@...am.me.uk
Subject: Re: [GIT PULL] MIPS fixes for v6.18

On Mon, Nov 24, 2025 at 04:46:44PM +0100, Gregory CLEMENT wrote:
> Hello Thomas,
> 
> > The following changes since commit e9a6fb0bcdd7609be6969112f3fbfcce3b1d4a7c:
> >
> >   Linux 6.18-rc5 (2025-11-09 15:10:19 -0800)
> >
> > are available in the Git repository at:
> >
> >   git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux.git/ tags/mips-fixes_6.18_1
> >
> > for you to fetch changes up to 14b46ba92bf547508b4a49370c99aba76cb53b53:
> >
> >   MIPS: kernel: Fix random segmentation faults (2025-11-21 13:24:05 +0100)
> >
> > ----------------------------------------------------------------
> > - Fix CPU type in DT for econet
> > - Fix for Malta PCI MMIO breakage for SOC-it
> > - Fix TLB shutdown caused by iniital uniquification
> > - Fix random seg faults
> >
> > ----------------------------------------------------------------
> > Aleksander Jan Bajkowski (1):
> >       mips: dts: econet: fix EN751221 core type
> >
> > Maciej W. Rozycki (2):
> >       MIPS: Malta: Fix !EVA SOC-it PCI MMIO
> >       MIPS: mm: Prevent a TLB shutdown on initial uniquification
> 
> Today, the kernel v6.18-rc7 no longer boots on EyeQ5 and EyeQ6H (MIPS
> I6500)-based boards. After a git bisect between v6.18-rc6 and v6.18-rc7,
> we found that the culprit is the commit "MIPS: mm: Prevent a TLB
> shutdown on initial uniquification".
> 
> Here is the log from a vanilla v6.18-rc7:
> 
> Linux version 6.18.0-rc7 (gclement@...ptop) (mips-img-linux-gnu-gcc (Codescape GNU Tools 2021.09-01 for MIPS IMG Linux) 11.2.0, GNU ld (Codescape GNU Tools 2021.09-01 for MIPS IMG Linux) 2.31.1) #1015 SMP Mon Nov 24 14:48:06 CET 2025
> CPU0 revision is: 0001b031 (MIPS I6500)
> FPU revision is: 20f30320
> MSA revision is: 00000320
> MIPS: machine is Mobile EyeQ6H MP6 Evaluation board
> earlycon: pl11 at MMIO32 0x00000000d3331000 (options '921600n8')
> printk: legacy bootconsole [pl11] enabled
> Initrd not found or empty - disabling initrd
> OF: reserved mem: Reserved memory: No reserved-memory node in the DT
> VP topology {4,4,4,4},{4,4,4,4} total 32
> VP Local Reset Exception Base support 47 bits address
> Primary instruction cache 64kB, VIPT, 4-way, linesize 64 bytes.
> Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 64 bytes
> MIPS secondary cache 1024kB, 16-way, linesize 64 bytes.
> Zone ranges:
>   Normal   [mem 0x0000000100000000-0x00000001ffffffff]
> Movable zone start for each node
> Early memory node ranges
>   node   0: [mem 0x0000000100000000-0x00000001ffffffff]
> Initmem setup node 0 [mem 0x0000000100000000-0x00000001ffffffff]
> percpu: Embedded 6 pages/cpu s46496 r8192 d43616 u98304
> Kernel command line: earlycon
> printk: log buffer data + meta data: 131072 + 458752 = 589824 bytes
> Dentry cache hash table entries: 524288 (order: 8, 4194304 bytes, linear)
> Inode-cache hash table entries: 262144 (order: 7, 2097152 bytes, linear)
> 
> and with the commit reverted:

I see something similair on a Octeon board with the addition

Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: r4k_tlb_uniquify+0x31c/0x320

Maciej, any idea ?

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]