From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-174.mta1.migadu.com (out-174.mta1.migadu.com [95.215.58.174]) (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 32BA83921FB for ; Mon, 20 Jul 2026 19:20:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.174 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784575242; cv=none; b=d31eOy6MmqdGam/AgXCM6QI/OsP2kzaNQQacb/7sdXmA0vItWDV/AO3IVQrCMbTMeS+4EhGRl9rZWjMLyziJIOpp/xGCn7xCGdSkyIvDVM8VrK1nqAz7kAd35m4EvxTdTzXEC6Pi0OgFWq7C37XiPDLMgVlsRMwBSnX1jKzFyek= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784575242; c=relaxed/simple; bh=YkDga7IATsXl4YWnQ3AMcuAE7o5H50j43pX7QJYnMuc=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Hi6uL+oDkZWvYDxpgdz0/ZbvT+/NW7EH8fdow6c44p8EgvDAB1rsCdgLlhwshD7cLcM9YBcCccDdiveJqZxaj8S0oqpMAV+ofbXHPSGh1RSrNB4OC7Uabw2Mr1F7dFalZ+MxfQ/UESCvTv3RwLA+f67bLdj90irjl4udmMRZwjw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=ZcrB9E44; arc=none smtp.client-ip=95.215.58.174 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="ZcrB9E44" Message-ID: <9f89e398-9848-40bb-a674-9719d94a6151@linux.dev> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1784575238; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=3wJ9D0TVK5fJr6gVBjocMtF4cEPIgYn4knacn+k2k1s=; b=ZcrB9E445+ortxUfaOi+fZvfwmU7Q2NEQESE9kDfGrLO43olHX3YRXFKc07EL1Es0MVvYV 1KBKm86o+qi1AfeIOn8tjNNcI9VtLDiWppbwSzWhvxmvVCyI6l51U2UgnHhU6v/C2PXUBQ 2VjuGeLSD5HxW53jet49vgwzyKcZneQ= Date: Mon, 20 Jul 2026 12:19:55 -0700 Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: Re: [RFC PATCH 1/2] RDMA/rxe: drive UDP tunnel socket lifetime from the GID table To: Serhat Kumral , Zhu Yanjun , Zhu Yanjun Cc: Jason Gunthorpe , Leon Romanovsky , David Ahern , linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+8c9eede336e3a843750e@syzkaller.appspotmail.com References: <19670ac6-ebab-4074-ab4f-3db06e1db291@linux.dev> <20260720181551.30322-1-serhatkumral1@gmail.com> Content-Language: en-US X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: "yanjun.zhu" In-Reply-To: <20260720181551.30322-1-serhatkumral1@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Migadu-Flow: FLOW_OUT On 7/20/26 11:15 AM, Serhat Kumral wrote: > Thanks for the trace. I have already provided all the details needed to reproduce this issue. I suggest reproducing the problem locally first, which would help avoid a lengthy back-and-forth discussion. It would also allow you to validate your own fix in the same environment before submitting it. Zhu Yanjun > >> KASAN: null-ptr-deref in range >> [0x0000000000000000-0x0000000000000007] >> RIP: 0010:ip_rcv+0xeb/0x570 > > This shows that the failure is not a deadlock, but a NULL pointer > dereference in the IPv4 receive path. > > To identify the exact source line and confirm which pointer is NULL, > could you also provide the output of: > > ./scripts/faddr2line vmlinux 'ip_rcv+0xeb/0x570' > > My series does not modify the RXE IPv4 packet-processing functions, > but it does change the lifetime of both IPv4 and IPv6 UDP tunnel > sockets. > > Could you please run the same selftest on the same commit and config > with this series reverted, and report whether it still crashes?