From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 AFDEC26ADE for ; Mon, 27 May 2024 15:47:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716824827; cv=none; b=mGGiHeSYxTJkjJgzr256PQQBA38SvO2D02gYOSJOc0FZ0RojIYUmtR2ykgqfY5Wa7/3T1DHqTBVYKVUdOPASGS5r62028jTAQg8re5cTY3w3rPwcqp7bNTKH9taGBKF9Bx1IGLOVBfZOg8i3apF1PPN1AddtKtJgDLXDD4pcXoU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716824827; c=relaxed/simple; bh=GEp2k5W9TvRI9RyEpVUPOmID9fhPinMprrqF9UDRpfI=; h=From:To:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=UPYIJpuEaceYp3T5mZ9nKpNqM+3SMrNsLg7xa7sqnCel+Q7nvgC/Hc2HFUpiJnXRbXUn0Tw+lxpW2kIKfy2d7L8TNsb6MXCqQ/IV0rM7a1zPup/iqe1qsod/+LuIU18m7FBXWx7prEzXYkqb2lD3/i7CTGC20DtmwqBSd6B7qYU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=gl19VmpW; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=9lDldjhL; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="gl19VmpW"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="9lDldjhL" From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1716824824; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=OsjTH1PuS8M1Wx9TxA/JCt4/23ZLBMX6f89jtTtnVP8=; b=gl19VmpWzSJYH9XGGyr6VKQ9YcMvNpz1ii3wKkdTiE0jfrX0d8iyAEf8+1x72+uOBH+VIt mM+2Bo94npIKwa+GExJV1Y9jz+H7ZYtiH22H3nOfmxs0a55z8L2byJ2JARDpvSsnzFmro5 p4c0ECsOCNYjushwn0E60CEna+vx0R8BFeg77T0RR7/CD4+uMEbiqVPksN04m6Hj1jy2tW UlKP7gsKsShaFYoIXvn9HT0EFGOPYB7/t9BZAssLuAGzpvpezFAj23nKl0zj5MbvfpEq7W 8LFcoiM1bh5058SGKCYoXc/9g1V+rYBvRrs1t16IHqxd71xvmkgcbyAOlCKNbQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1716824824; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=OsjTH1PuS8M1Wx9TxA/JCt4/23ZLBMX6f89jtTtnVP8=; b=9lDldjhLzBpct0zDoHN5MovMMYyRBxNN5vkWOQpslABZDQjUnzrurvJfn7f5B6ptskin/c am/bQZziKZUQcVAg== To: syzbot , bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, linux-kernel@vger.kernel.org, mingo@redhat.com, syzkaller-bugs@googlegroups.com, x86@kernel.org Subject: Re: [syzbot] [kernel?] WARNING: locking bug in collect_percpu_times In-Reply-To: <000000000000b4935a06194e4cc7@google.com> References: <000000000000b4935a06194e4cc7@google.com> Date: Mon, 27 May 2024 17:47:03 +0200 Message-ID: <87wmnfb6ko.ffs@tglx> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain On Sat, May 25 2024 at 14:52, syzbot wrote: > HEAD commit: 2a8120d7b482 Merge tag 's390-6.10-2' of git://git.kernel.o.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=145dd452980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=5dd4fde1337a9e18 > dashboard link: https://syzkaller.appspot.com/bug?extid=97f26f162079653e77b8 > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > userspace arch: i386 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-2a8120d7.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/78c72ae6bdaf/vmlinux-2a8120d7.xz > kernel image: https://storage.googleapis.com/syzbot-assets/99dbb805b738/bzImage-2a8120d7.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+97f26f162079653e77b8@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > Looking for class "->pcpu, cpu)->seq" with key __key.9, but found a different class "&per_cpu_ptr(group->pcpu, cpu)->seq" with the same key This is a pattern I've seen in quite some recent syzbot reports where the class string is a subset of the recorded string. I have no idea how that can happen, but it smells like data corruption of some sort.