From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.ptr1337.dev (mail.ptr1337.dev [202.61.224.105]) (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 A51673D8135; Tue, 14 Apr 2026 15:40:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=202.61.224.105 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776181210; cv=none; b=gEpzTYWjdjZqAnyfXTgfe6L4unacXjhjAi5Sn0WQ+HUXk9WTtYQ4P/fXfl3eBMozQ2KfONcLOLo697l1kbJxsNTxu4c88xPblthU640zWVOpzEs2U1j3pzD1W2dPBGSjQpm45R9pIRMKsfSK/NdBm2gn5VXGHMJJbjY6NVsPw98= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776181210; c=relaxed/simple; bh=/hbq9f62sy3zTymZ/tCBjj9yBX6FjRzT54Jp86YE5Eg=; h=Content-Type:Message-ID:Date:MIME-Version:Subject:To:Cc: References:From:In-Reply-To; b=H6uCUy6l5hv67WyOVwctig9mfckXwxqiVjJtCdzENA0MmchRLg4yQMiXawFn9pfGf7MqvKXcZ6wDqCiGb1cSqdmEgEy8+rqBRG1huCL288hq+aXSZ2DVmxJgJM7PS3lBFWj8JuAy2iFqCpqg3zlbBy+VEt6I6LmafrfxapPUeyg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=cachyos.org; spf=pass smtp.mailfrom=cachyos.org; dkim=pass (2048-bit key) header.d=cachyos.org header.i=@cachyos.org header.b=N8DG4Rra; arc=none smtp.client-ip=202.61.224.105 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=cachyos.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=cachyos.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=cachyos.org header.i=@cachyos.org header.b="N8DG4Rra" Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 64A0528601B; Tue, 14 Apr 2026 17:39:48 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cachyos.org; s=dkim; t=1776181206; h=from:subject:date:message-id:to:cc:mime-version:content-type: in-reply-to:references; bh=TRkUVuOQeq5Z5SjZhRD6qZFJgCtwbDEy/Asrr2F24NA=; b=N8DG4Rra4KLwOyKjeHa+N8iEQYdRlSKj88SKiopR37J/JDfRZtyzFNNDIeADwcch505Xy8 YSkqXZ+wIuGDmsHnsYuXzbuPYi6dYmv6kzI+0ByILJd5aD2wKKN/RqxgSVjeuHuLbSsups CFwXntF75VWv1dsYJMwdr7RdfS4ZATCJgIiMthF5LMGV+ISVVfzxGcZu4rKQpXXeoxYrZT /wGKLdLpqAaxOWbZnle3hAk7QtnMDUsL9EzNi9oWlIajDQ8jqy0QrooOD4J40oLsmmtYx7 AV4zSYlpt/dun2f9rDKasT0jynylvaiSd6hKEV53/75HZsaqcJ0NxkrrPZAFiQ== Content-Type: multipart/mixed; boundary="------------vQ8liQkI7bMgytpMGm0FanKR" Message-ID: Date: Tue, 14 Apr 2026 15:39:00 +0000 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: Re: The "clockevents: Prevent timer interrupt starvation" patch causes lockups To: Hanabishi , Thomas Gleixner , LKML Cc: Calvin Owens , Peter Zijlstra , Anna-Maria Behnsen , Frederic Weisbecker , Ingo Molnar , John Stultz , Stephen Boyd , Alexander Viro , Christian Brauner , Jan Kara , linux-fsdevel@vger.kernel.org, Sebastian Reichel , linux-pm@vger.kernel.org, Pablo Neira Ayuso , Florian Westphal , Phil Sutter , netfilter-devel@vger.kernel.org, coreteam@netfilter.org References: <20260407083219.478203185@kernel.org> <20260407083247.562657657@kernel.org> <68d1e9ac-2780-4be3-8ee3-0788062dd3a4@gmail.com> From: Eric Naim In-Reply-To: <68d1e9ac-2780-4be3-8ee3-0788062dd3a4@gmail.com> X-Last-TLS-Session-Version: TLSv1.3 This is a multi-part message in MIME format. --------------vQ8liQkI7bMgytpMGm0FanKR Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 4/14/26 5:20 AM, Hanabishi wrote: > > Hello. > > Sorry, but this patch as of 7.0 introduced *severe* periodic lockups on my > Ryzen 7700X machine. > I see such messages in the log: > > clocksource: Long readout interval, skipping watchdog check: cs_nsec: > 2897344852 wd_nsec: 2897356996 > > Reverting d6e152d905bdb1f32f9d99775e2f453350399a6a for mainline fixes the > issue for me. > Hi maintainers, several users from CachyOS has reported this regression as well. We landed on the same bisection. One of the users that could reproduce this reliably reproduced this just by watching a YouTube video in a browser, and observed freezes and stutters when interacting with the system. I had an LLM generate a fix (patch attached), and it fixed the regression for that user. Full disclosure: it is written completely by AI, and I am also not familiar with this subsystem. I just hope that this patch can be helpful in fixing the regression. Please don't hesitate to tell me off if utilizing AI in this way is not helpful, so I can keep this in mind for future contributions. -- Regards, Eric --------------vQ8liQkI7bMgytpMGm0FanKR Content-Type: text/x-patch; charset=UTF-8; name="ai.patch" Content-Disposition: attachment; filename="ai.patch" Content-Transfer-Encoding: base64 ZGlmZiAtLWdpdCBhL2tlcm5lbC90aW1lL2Nsb2NrZXZlbnRzLmMgYi9rZXJuZWwvdGltZS9j bG9ja2V2ZW50cy5jCmluZGV4IDM4NTcwOTk4YTE5Yi4uMzdiMTAwNDU1NzJlIDEwMDY0NAot LS0gYS9rZXJuZWwvdGltZS9jbG9ja2V2ZW50cy5jCisrKyBiL2tlcm5lbC90aW1lL2Nsb2Nr ZXZlbnRzLmMKQEAgLTMzMiw4ICszMzIsMTAgQEAgaW50IGNsb2NrZXZlbnRzX3Byb2dyYW1f ZXZlbnQoc3RydWN0IGNsb2NrX2V2ZW50X2RldmljZSAqZGV2LCBrdGltZV90IGV4cGlyZXMs CiAJaWYgKGRlbHRhID4gKGludDY0X3QpZGV2LT5taW5fZGVsdGFfbnMpIHsKIAkJZGVsdGEg PSBtaW4oZGVsdGEsIChpbnQ2NF90KSBkZXYtPm1heF9kZWx0YV9ucyk7CiAJCWNsYyA9ICgo dW5zaWduZWQgbG9uZyBsb25nKSBkZWx0YSAqIGRldi0+bXVsdCkgPj4gZGV2LT5zaGlmdDsK LQkJaWYgKCFkZXYtPnNldF9uZXh0X2V2ZW50KCh1bnNpZ25lZCBsb25nKSBjbGMsIGRldikp CisJCWlmICghZGV2LT5zZXRfbmV4dF9ldmVudCgodW5zaWduZWQgbG9uZykgY2xjLCBkZXYp KSB7CisJCQlkZXYtPm5leHRfZXZlbnRfZm9yY2VkID0gMDsKIAkJCXJldHVybiAwOworCQl9 CiAJfQogCiAJaWYgKGRldi0+bmV4dF9ldmVudF9mb3JjZWQpCmRpZmYgLS1naXQgYS9rZXJu ZWwvdGltZS90aWNrLW9uZXNob3QuYyBiL2tlcm5lbC90aW1lL3RpY2stb25lc2hvdC5jCmlu ZGV4IDc0NzI1OTdmMzIyNS4uYmY0MTE0NzJkNGY3IDEwMDY0NAotLS0gYS9rZXJuZWwvdGlt ZS90aWNrLW9uZXNob3QuYworKysgYi9rZXJuZWwvdGltZS90aWNrLW9uZXNob3QuYwpAQCAt MzQsNiArMzQsNyBAQCBpbnQgdGlja19wcm9ncmFtX2V2ZW50KGt0aW1lX3QgZXhwaXJlcywg aW50IGZvcmNlKQogCQkgKi8KIAkJY2xvY2tldmVudHNfc3dpdGNoX3N0YXRlKGRldiwgQ0xP Q0tfRVZUX1NUQVRFX09ORVNIT1RfU1RPUFBFRCk7CiAJCWRldi0+bmV4dF9ldmVudCA9IEtU SU1FX01BWDsKKwkJZGV2LT5uZXh0X2V2ZW50X2ZvcmNlZCA9IDA7CiAJCXJldHVybiAwOwog CX0KIApAQCAtNDMsNiArNDQsNyBAQCBpbnQgdGlja19wcm9ncmFtX2V2ZW50KGt0aW1lX3Qg ZXhwaXJlcywgaW50IGZvcmNlKQogCQkgKiBiZWZvcmUgdXNpbmcgaXQuCiAJCSAqLwogCQlj bG9ja2V2ZW50c19zd2l0Y2hfc3RhdGUoZGV2LCBDTE9DS19FVlRfU1RBVEVfT05FU0hPVCk7 CisJCWRldi0+bmV4dF9ldmVudF9mb3JjZWQgPSAwOwogCX0KIAogCXJldHVybiBjbG9ja2V2 ZW50c19wcm9ncmFtX2V2ZW50KGRldiwgZXhwaXJlcywgZm9yY2UpOwo= --------------vQ8liQkI7bMgytpMGm0FanKR--