linux-kernel - Re: [PATCH] clocksource: disable irq when holding watchdog

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Message-ID: <585a49dc-4594-42be-9bb9-c52d5189058b@paulmck-laptop>
Date:   Fri, 20 Oct 2023 06:40:17 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        John Stultz <jstultz@...gle.com>,
        Stephen Boyd <sboyd@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        x86@...nel.org, joel@...lfernandes.org, frederic@...nel.org
Subject: Re: [PATCH] clocksource: disable irq when holding watchdog_lock.

On Fri, Oct 20, 2023 at 09:50:48PM +0900, Tetsuo Handa wrote:
> On 2023/10/20 12:30, Paul E. McKenney wrote:
> > A bit of a long shot, but given your earlier console log, could you
> > please try Frederic's patches?
> > 
> > https://lore.kernel.org/lkml/20231019233543.1243121-1-frederic@kernel.org/
> 
> Didn't make difference.

Huh.  Thank you for trying it out!

							Thanx, Paul

> I booted another Ubuntu kernel used by installation ISO image, and found no problem.
> Maybe the only way to narrow down is to build various kernel configurations?
> 
> ubuntu-23.10-live-server-amd64.iso
> [    0.000000] Linux version 6.5.0-9-generic (buildd@...03-amd64-043) (x86_64-linux-gnu-gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0, GNU ld (GNU Binutils for Ubuntu) 2.41) #9-Ubuntu SMP PREEMPT_DYNAMIC Sat Oct  7 01:35:40 UTC 2023 (Ubuntu 6.5.0-9.9-generic 6.5.3)
> [    0.000000] Command line: BOOT_IMAGE=/casper/vmlinuz console=ttyS0,115200n8 console=tty0 ---
> (...snipped...)
> [    0.896948] smp: Bringing up secondary CPUs ...
> [    0.899571] smpboot: x86: Booting SMP configuration:
> [    0.901912] .... node  #0, CPUs:      #1 #2 #3 #4 #5 #6 #7
> [    0.914558] TSC synchronization [CPU#0 -> CPU#1]:
> [    0.916496] Measured 62205 cycles TSC warp between CPUs, turning off TSC clock.
> [    0.916496] tsc: Marking TSC unstable due to check_tsc_sync_source failed
> [    0.940504] smp: Brought up 1 node, 8 CPUs
> [    0.944498] smpboot: Max logical packages: 1
> [    0.946468] smpboot: Total of 8 processors activated (41779.32 BogoMIPS)
>