From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx.treblig.org (mx.treblig.org [46.235.229.95]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 58F71390CB4; Mon, 3 Aug 2026 16:46:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=46.235.229.95 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785775571; cv=none; b=hfvEtwhnKCG4Ksg26tRxR3hj7ClSVWMJVcxz932Xzf2frCd/oBem1Un5zUDTOTcvxVHkobpQiwhpikMO3lbX3xtsjCNKQE18vlDE6He++2BHGFACSJlulDBVifRZ+9HYF5SQt5IdkrHoZMQWYGv6MZO/DCurz9J5JkOk9zsx2Ps= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785775571; c=relaxed/simple; bh=F0lnlJsWFNAUXIOKXfQaWjO1pNnnOibsqUn/q02g2+0=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=g1QC4aQpTHCTmInywhw93lOZsVsA7K3Xnsexexu4OAqv1hcuCMvg9O6Jy3TJtxuah7jzGSvXP8Vkic1cRXAhcZjgmoKZ6Ol+B0T/u1myF7PH4QTUoUO/c+XGSz+8g2De6gLVa34WLJON8aOu27K2admFX+EJM1jsbWWLSpEKr5U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=treblig.org; spf=pass smtp.mailfrom=treblig.org; dkim=pass (2048-bit key) header.d=treblig.org header.i=@treblig.org header.b=JDEHwVbf; arc=none smtp.client-ip=46.235.229.95 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=treblig.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=treblig.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=treblig.org header.i=@treblig.org header.b="JDEHwVbf" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=treblig.org ; s=bytemarkmx; h=Content-Type:MIME-Version:Message-ID:Subject:From:Date:From :Subject; bh=zg6mGQ9Qy/W2eFUCQmgqkAbntH7MTgnJEXtuNGzzzFU=; b=JDEHwVbfPMAG6BcJ hWbDazWWo9BSvOq4axBW4cS1/eKWyopbP+RsTtz/iwxhlpQG7UB9p2VSqm7RRicldCj9yCSAXGbem c7pkMLRpcuRPnTfTfcDZkYEY1lYIKb5di6dDX7+ZJtfWVanv7MIB46iH06OwmwiOCQ38itAxveZq8 gfwrWnmcYt9qQGF+dl6ArEt+ikaiRAgGCHBW0qrciNxFuNEzGDNKUCeMO80HueJmoAGTKGl+B57jk q++d9SLNSUdvhCy52lmHdYn9kpLk9+WPlUMGxOUOUQoSMvcCqwUz2d4uSZVgLZEt2jY0wsOFVjnyB ZkAT4LEDUyytr29nKw==; Received: from dg by mx.treblig.org with local (Exim 4.98.2) (envelope-from ) id 1wqvna-00000000ah7-3hln; Mon, 03 Aug 2026 16:45:58 +0000 Date: Mon, 3 Aug 2026 16:45:58 +0000 From: "Dr. David Alan Gilbert" To: tglx@kernel.org, jstultz@google.com, sboyd@kernel.org Cc: linux-kernel@vger.kernel.org, regressions@lists.linux.dev Subject: [REGRESSION] Random 'clocksource: Watchdog remote CPU ?? read timed out' Message-ID: 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=iso-8859-1 Content-Disposition: inline X-Chocolate: 70 percent or better cocoa solids preferably X-Operating-System: Linux/6.12.100+deb13-amd64 (x86_64) X-Uptime: 16:36:17 up 2 days, 22:38, 2 users, load average: 0.09, 0.04, 0.01 User-Agent: Mutt/2.2.13 (2024-03-09) Hi all, I've noticed in my logs on every boot since 7.1.x a: [ 6.749566] clocksource: Watchdog remote CPU 11 read timed out with the CPU being different each time. There's no apparent bad side effects or anything, but it seemed worth reporting and I noticed It's only one each boot as far as I can tell. I checked back through journalctl -b -... and the first time I got it was the first 7.1.x boot, and I remember seeing this during rc's as well but that was on a bit of a random build. The current ones are happening on Fedora's 7.1.5-201.fc44.x86_64 dg@dalek:~$ sudo dmesg|grep -i watchdog [ 0.381705] NMI watchdog: Enabled. Permanently consumes one hw-PMU counter. [ 2.244379] sp5100_tco: SP5100/SB800 TCO WatchDog Timer Driver [ 2.253962] sp5100-tco sp5100-tco: Using 0xfeb00000 for watchdog MMIO address [ 6.749566] clocksource: Watchdog remote CPU 11 read timed out dg@dalek:~$ sudo journalctl -b -1 |grep -i Watchdog Aug 02 11:52:48 dalek kernel: NMI watchdog: Enabled. Permanently consumes one hw-PMU counter. Aug 02 11:52:49 dalek kernel: sp5100_tco: SP5100/SB800 TCO WatchDog Timer Driver Aug 02 11:52:49 dalek kernel: sp5100-tco sp5100-tco: Using 0xfeb00000 for watchdog MMIO address Aug 02 11:53:00 dalek rtkit-daemon[1703]: Watchdog thread running. Aug 02 11:53:17 dalek kernel: clocksource: Watchdog remote CPU 26 read timed out dg@dalek:~$ sudo journalctl -b -2 |grep -i Watchdog Aug 01 12:14:48 dalek kernel: NMI watchdog: Enabled. Permanently consumes one hw-PMU counter. Aug 01 12:14:49 dalek kernel: sp5100_tco: SP5100/SB800 TCO WatchDog Timer Driver Aug 01 12:14:49 dalek kernel: sp5100-tco sp5100-tco: Using 0xfeb00000 for watchdog MMIO address Aug 01 12:15:00 dalek rtkit-daemon[1697]: Watchdog thread running. Aug 01 12:15:16 dalek kernel: clocksource: Watchdog remote CPU 24 read timed out dg@dalek:~$ sudo journalctl -b -3 |grep -i Watchdog Jul 31 12:16:33 dalek kernel: NMI watchdog: Enabled. Permanently consumes one hw-PMU counter. Jul 31 12:16:34 dalek kernel: sp5100_tco: SP5100/SB800 TCO WatchDog Timer Driver Jul 31 12:16:34 dalek kernel: sp5100-tco sp5100-tco: Using 0xfeb00000 for watchdog MMIO address Jul 31 12:16:44 dalek rtkit-daemon[1696]: Watchdog thread running. Jul 31 12:16:48 dalek kernel: clocksource: Watchdog remote CPU 31 read timed out dg@dalek:~$ lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Address sizes: 43 bits physical, 48 bits virtual Byte Order: Little Endian CPU(s): 32 On-line CPU(s) list: 0-31 Vendor ID: AuthenticAMD Model name: AMD Ryzen 9 3950X 16-Core Processor CPU family: 23 Model: 113 Thread(s) per core: 2 Core(s) per socket: 16 Socket(s): 1 Stepping: 0 Frequency boost: enabled CPU(s) scaling MHz: 50% CPU max MHz: 4761.2300 CPU min MHz: 2200.0000 BogoMIPS: 6986.90 Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl xto pology nonstop_tsc cpuid extd_apicid aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx1 6 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr 8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_cor e perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate ssbd mba ibpb stibp vm mcall fsgsbase bmi1 avx2 smep bmi2 cqm rdt_a rdseed adx smap clflushopt clwb sha_ni xsav eopt xsavec xgetbv1 cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsav eerptr rdpru wbnoinvd arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif v_spec_ctrl umip rdpid o verflow_recov succor smca sev sev_es Thanks, Dave -- -----Open up your eyes, open up your mind, open up your code ------- / Dr. David Alan Gilbert | Running GNU/Linux | Happy \ \ dave @ treblig.org | | In Hex / \ _________________________|_____ http://www.treblig.org |_______/