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[83.28.48.5]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49b94dc0f57sm231676445e9.2.2026.08.30.05.16.19 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Sun, 30 Aug 2026 05:16:19 -0700 (PDT) Date: Sun, 30 Aug 2026 14:16:16 +0200 From: Michal Pecio To: Thomas Gleixner Cc: linux-kernel@vger.kernel.org Subject: Watchdog remote CPU read timed out Message-ID: <20260830141503.42994806.michal.pecio@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Hi Thomas, This is another warning I'm getting on recent 7.x kernels, apparently from new code you wrote a few months ago. Increasing WATCHDOG_DEFAULT_TIMEOUT_NS to 100us makes it go away, at least for a few minutes (I will try longer uptime later). With a few debug prints, I found that watchdog_wait_seq() fails every few seconds, usually on CPU 0 but sporadically on others too. Example output below. Is this something to worry about / fix? Thanks, Michal [ 4307.502933] clocksource: watchdog_wait_seq done on cpu 0 [ 4307.502946] clocksource: watchdog_wait_seq done on cpu 1 [ 4307.502950] clocksource: watchdog_wait_seq done on cpu 0 [ 4307.502952] clocksource: watchdog_wait_seq done on cpu 1 [ 4307.502954] clocksource: watchdog_wait_seq done on cpu 0 [ 4307.502956] clocksource: watchdog_wait_seq done on cpu 1 [ 4307.502958] clocksource: watchdog_wait_seq done on cpu 0 [ 4307.502960] clocksource: watchdog_wait_seq done on cpu 1 [ 4308.006997] clocksource: watchdog_wait_seq done on cpu 0 [ 4308.007028] clocksource: watchdog_wait_seq done on cpu 0 [ 4308.007031] clocksource: watchdog_wait_seq done on cpu 0 [ 4308.007028] clocksource: WD_CPU_TIMEOUT in watchdog_wait_seq cpu 2 [ 4308.007034] clocksource: watchdog_wait_seq done on cpu 0 [ 4308.502975] clocksource: watchdog_wait_seq done on cpu 0 [ 4308.502991] clocksource: watchdog_wait_seq done on cpu 3 [ 4308.503021] clocksource: WD_CPU_TIMEOUT in watchdog_wait_seq cpu 0 [ 4308.503048] clocksource: watchdog_wait_seq done on cpu 3 [ 4308.503050] clocksource: watchdog_wait_seq done on cpu 3 [ 4308.503051] clocksource: watchdog_wait_seq done on cpu 3