From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 2C86936B07B for ; Thu, 19 Mar 2026 09:21:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773912109; cv=none; b=OYusNMH+TjFhTfNwRm9YJTOQLh+C0M167GwLlWSohlpTolcBkL6wASBSkCDS0sE+EJF9auTpHXpJFDx8cF8ilq0jkweAeh1ZLVB6A5pQr3Etegv4k3yIKF/1ewDpEABIjh5hb/Fu/eDcPG38U/uLCWE/Y5G0qMezSjBg6+BT2Uk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773912109; c=relaxed/simple; bh=B6EqSu/m0AtpJJagL7Wx8GxNV04Uu+a6gD2Q5oQPp+g=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=G8Ecr7vzGBCVbUaDcPF1x1DhfRbhqjoK7f31+JZY4pVI7YHDjRJTrs/WonF6Gc01EQ+7hx1OxjoEYU//Hzn+VnW//n4+eoAcz+aK7r4WvJE4c8vqn2e8WmiyVji8uFyB+NSZAmjCAQQzwYpX1/o5/xrYg5hLCjQrujZDbamLpB0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Mi2tRmrM; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Mi2tRmrM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E3078C19424; Thu, 19 Mar 2026 09:21:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773912109; bh=B6EqSu/m0AtpJJagL7Wx8GxNV04Uu+a6gD2Q5oQPp+g=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=Mi2tRmrMgxOLokAy7WBVBO+vqXEy30vNILVvF1MelwmHL+jsDxyu3UvCAPejBdc1z HvV9ZINHHX5NYdfn8cc18INewbfUT0d1gsVoRd1fdPLuLEKIAJW1w3Zt9rW8kuNLJL Djsh+mUznB/jkcdxzkJeOcuBpnSoLD6EH84y03bDAQcjaCTja3fkk1s11foF5leU0T SKnS3LgvGST45kR6X4yt2rfiJ9jutmbSUSOjmG3vO06NUNnG+MewOn0x6uWKJ0duiW lqLGGi6sCGVUBWP5JQj2RSjShLuNf9bhZ0yZAFkUwHH9OflrVygU7woH5Qmkc60IBY 8RDoMelal0ykg== Message-ID: <8ab10631-4672-4196-b32e-7c5a01707424@kernel.org> Date: Thu, 19 Mar 2026 10:21:40 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] kernel BUG in collapse_scan_file To: Lance Yang , "Lorenzo Stoakes (Oracle)" Cc: syzbot , willy@infradead.org, baolin.wang@linux.alibaba.com, npache@redhat.com, linux-mm@kvack.org, baohua@kernel.org, ryan.roberts@arm.com, syzkaller-bugs@googlegroups.com, dev.jain@arm.com, ziy@nvidia.com, linux-kernel@vger.kernel.org, Liam.Howlett@oracle.com, akpm@linux-foundation.org References: <69bba3c0.050a0220.227207.002b.GAE@google.com> <10e5f1d6-077d-4783-aa16-6c8b98cb9e74@lucifer.local> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 3/19/26 10:14, Lance Yang wrote: > > > On 2026/3/19 17:00, David Hildenbrand (Arm) wrote: >> On 3/19/26 09:53, Lorenzo Stoakes (Oracle) wrote: >>> >>> Hmm we shouldn't leave this bug in place while working for a fancier >>> fix?? >>> >>> Can we get _something_ going as an upstream fix? We can improve >>> whatever we do >>> later right? >>> >>> David, thoughts? >> >> I recall Willy mentioning that the issue is likely a false positive. >> >> IIUC, that commit is not upstream? So it only triggers in linux-next. > > Right. That does not appear to be in upstream, I only see it in linux- > next :) > >> Which means: >> >> 1) If it's a false positive, upstream is not effected (no XA_NODE_BUG_ON) >> >> 2) If it's not a false positive, upstream is effected but does not >> trigger the XA_NODE_BUG_ON > > Yep. So this particular BUG_ON is not affecting upstream directly. > > That said, syzbot will likely keep hitting it in linux-next and > generating noise for us until it is addressed there ... Right, I assume this comes through Willy's tree, so Willy should consider removing it for the time being. -- Cheers, David