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Fri, 7 Nov 2025 14:29:46 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: AIEMUPQi-EY- Date: Fri, 07 Nov 2025 19:29:25 +0000 From: "Jiaxun Yang" To: "Nick Bowler" , linux-kernel@vger.kernel.org, regressions@lists.linux.dev, "linux-mips@vger.kernel.org" Cc: "stable@vger.kernel.org" Message-Id: In-Reply-To: References: Subject: Re: PROBLEM: boot hang on Indy R4400SC (regression) Content-Type: text/plain Content-Transfer-Encoding: 7bit On Fri, 7 Nov 2025, at 7:04 AM, Nick Bowler wrote: > Hi, Hi Nick, Many thanks for the issue report! It's pretty rare to get reports from hardware that old. Unfortunately my Indy won't go over ARCS prom so I'm not in a position to debug this on my side. I have inspected the code again and I can't see anything preventing it to work on R4000 family. Maybe we can revert this for non-MIPS64R1 system only so we can get something working for both old and new systems. #regzbot introduced: 35ad7e181541aa5757f9f316768d3e64403ec843 Thanks > > After a recent 6.1.y stable kernel update, my Indy (mips64 R4400SC) now > just stops booting early, just before when I would normally see the > kernel messages about mounting the root filesystem. > > There are no further messages of any kind, and the boot process does not > appear to ever complete. However, the kernel is not fully crashed, as > it does respond to sysrq commands from the keyboard (and I do get output > on the console from these). > > I bisected to the following: > > 794b679a28bb59a4533ae39a7cf945b9d5bbe336 is the first bad commit > commit 794b679a28bb59a4533ae39a7cf945b9d5bbe336 > Author: Jiaxun Yang > Date: Sat Jun 7 13:43:56 2025 +0100 > > MIPS: mm: tlb-r4k: Uniquify TLB entries on init > > commit 35ad7e181541aa5757f9f316768d3e64403ec843 upstream. > > This reverts cleanly on top of 6.1.158 and the resulting kernel boots > normally. I then reproduced this failure on 6.18-rc4. Reverting > 35ad7e181541 on top of 6.18-rc4 also results in a normal boot. > > Let me know if you need any more info! > > Thanks, > Nick -- - Jiaxun