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Tue, 10 Nov 2026 15:30:33 +0000 (GMT) Received: from [9.47.158.153] (unknown [9.47.158.153]) by smtpav03.dal12v.mail.ibm.com (Postfix) with ESMTP; Tue, 10 Nov 2026 15:30:33 +0000 (GMT) Content-Type: multipart/mixed; boundary="------------8fha0YHSRmhg3C0ISGSEhsrK" Message-ID: <5552ccf5-87aa-4d29-b6f6-01e48674d443@linux.ibm.com> Date: Tue, 10 Nov 2026 10:30:33 -0500 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [BUG] tpm: prolonged stall in vtpm_proxy_fops_release() on Linux 7.3 From: Stefan Berger To: =?UTF-8?B?6ZOu?= Cc: Jarkko Sakkinen , peterhuewe@gmx.de, Jason Gunthorpe , linux-integrity@vger.kernel.org, syzkaller@googlegroups.com, linux-kernel@vger.kernel.org References: <012799b9-aa35-4990-86df-23b012ab94e6@linux.ibm.com> <931108a5-e880-4b74-b5e1-8625307af8a9@linux.ibm.com> <404c3349-1a9f-4bd3-b75a-187407855a39@linux.ibm.com> Content-Language: en-US In-Reply-To: <404c3349-1a9f-4bd3-b75a-187407855a39@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Info: AW1haW4tMjYxMTEwMDA2MCBTYWx0ZWRfX8+lOKDb2PkSe VasUKj4pRVacR/FmY5CWBBgB8KIexMpftaS+zJyThev/GArF9imcOl2Jga30TGPB3M0VcFDYC92 WCRuxabiW9Twe4tqde9zCq21on4hGis= X-Authority-Analysis: v=2.4 cv=GISdgeNK c=1 sm=1 tr=0 ts=6af3389b cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=zJRp6_cAMcgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=r77TgQKjGQsHNAKrUKIA:9 a=Bau4-PFvkfs7xET1opIA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=VkyE-FT4N_lJajCC7C0A:9 a=B2y7HmGcmWMA:10 X-Proofpoint-GUID: RGxF8TLwFSgmIxGXmbx1yo8zyIoQUUGa X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTEwMDA2MCBTYWx0ZWRfX6FXNDQKUkhLZ tCBgDqxjZ5CMxsoWZi3QH5VUpdlp/PgcJrPdlNjXcHinqHgylcA0uOj7M1PgZCLMKMnjR3MUc+f WZXsVjde1R7EOGBeuvKPKOIUANxLu8pAIZ6pi3UtsjOtBwohs1ASluVEtwm03Py1vkSpAKNmfHF 7XMfkejYbwaZ3I5tu+SK/MLs87ALdS2iwwYJN67HPN91mp3t52SossT993O/SAnCwEv7kIuBGb1 hI01O3n1bUWGC+oecyReAndI7Zy1v85IFnhrgbnx/MZPOhV0h/jMek3clvKaIIGrp745XzUcTPl OjpuTtS2erAW0ToETs7JDvgc8FeQQoZVsH/3aycpqwKL9q1IsthiPm67TeLsOIDs1zcZ3qps8Qv yod/E58JZkB20kN1wDE1QDxei0EhdXrr/8iYfmYNgE8iNCqAHlmZdQVNc4RNoD+KE0HBjjf0po+ WZ5Lu3bAFv681ssIm8w== X-Proofpoint-ORIG-GUID: CPTMS1b1HVnNkJYdSv31g_FNQcElj5FM X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-10_05,2026-11-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 bulkscore=0 impostorscore=0 clxscore=1015 adultscore=0 priorityscore=1501 phishscore=0 spamscore=0 malwarescore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611100060 This is a multi-part message in MIME format. --------------8fha0YHSRmhg3C0ISGSEhsrK Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit > > On 11/10/26 1:42 AM, 铮 wrote: >> Hi Stefan, >> >> Thank you for your question about closing the server-side fd. >> >> Short answer: yes, the server-side fds are released when the >> reproducer exits, and the hang occurs during that release. The hang >> reproduced in 4/4 recorded exit-time release attempts (three with N=32 >> and one with N=4). However, our separate tests that explicitly call >> close() on every ioctl-returned fd did NOT reproduce the hang. > Thanks, your supplied C-program made reproducing this issue straight-forward. A patch resolving this issue is attached. 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