From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp153-168.sina.com.cn (smtp153-168.sina.com.cn [61.135.153.168]) (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 5FEA9190072 for ; Mon, 21 Jul 2025 07:39:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=61.135.153.168 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753083561; cv=none; b=XpPSxpYZ9JGHfaFUnMx+LNbb5rT4K0lwaR7jvCNggaJgq2wBDhTc+9bJP+SaDNN+SgGEb0sJZBCxjtWhpiu6MLalGMsflFQfo/glqPCUoDEu7BCM4jELc74mrq5fX8+4z6D1dqqImbYzGdPGK32i0vhh3H13+TpNBzvTnTNEkX8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753083561; c=relaxed/simple; bh=HyeZ0t+fUqp6DmpAcnD/0zYxHWS0N7PStqbBaC7Ddu0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bOpj9iBZJwa9DrV4yLMu0w5spLSoCUvmwEHYiRbmBXRMrk+fnwmpNsh2GV39eTx3JW8GybfAobdE3msfNSM71wOYEtj8kKLdLs1mt6U1rzOi+Q16LQAeBC2rg34oVXIC8htEVyNKn8iaTHPJ5KKQuyGMQC6YQ3kw2L9vFR47vRw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b=No/uCqOq; arc=none smtp.client-ip=61.135.153.168 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b="No/uCqOq" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sina.com; s=201208; t=1753083551; bh=U6gS8wW1N1rmmAIeiXQDq86Bkvz0ze841MMdJQPGudQ=; h=From:Subject:Date:Message-ID; b=No/uCqOqkAGN9kzNas5QauyXWVX1pes2pLk3n4y+SqCW56zE90wmYvhIahdqcm7sQ 70RIaYzzib+peE5aaockNMfeSxEwzo1lIi4KIHDCfZWyZ++oAUqIx3V8Dt4/OSmNmP MR/JJVfBdYiph3G/HcTwNyFFoD4NygMBwRZX4ixE= X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([114.249.58.236]) by sina.com (10.54.253.33) with ESMTP id 687DEE710000095A; Mon, 21 Jul 2025 15:38:27 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com Authentication-Results: sina.com; spf=none smtp.mailfrom=hdanton@sina.com; dkim=none header.i=none; dmarc=none action=none header.from=hdanton@sina.com X-SMAIL-MID: 3940056685215 X-SMAIL-UIID: AC622C729A984C6B8A683DC717B364D0-20250721-153827-1 From: Hillf Danton To: syzbot Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [mm?] [input?] [usb?] INFO: rcu detected stall in devtmpfsd (3) Date: Mon, 21 Jul 2025 15:38:14 +0800 Message-ID: <20250721073815.2673-1-hdanton@sina.com> In-Reply-To: <687cfb6d.a70a0220.693ce.00c6.GAE@google.com> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit > Date: Sun, 20 Jul 2025 07:21:33 -0700 [thread overview] > Hello, > > syzbot found the following issue on: > > HEAD commit: 155a3c003e55 Merge tag 'for-6.16/dm-fixes-2' of git://git... > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=15d3658c580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=f62a2ef17395702a > dashboard link: https://syzkaller.appspot.com/bug?extid=5583f599fe40b819b3e7 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1096f58c580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1686a382580000 #syz test upstream master --- x/kernel/time/hrtimer.c +++ y/kernel/time/hrtimer.c @@ -1942,7 +1942,7 @@ retry: else expires_next = ktime_add(now, delta); tick_program_event(expires_next, 1); - pr_warn_once("hrtimer: interrupt took %llu ns\n", ktime_to_ns(delta)); + WARN(1, "hrtimer: interrupt took %llu ns on cpu%u\n", ktime_to_ns(delta), cpu_base->cpu); } #endif /* !CONFIG_HIGH_RES_TIMERS */ --