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Wed, 10 Jun 2026 13:03:29 +0000 (GMT) Received: from tuxmaker.linux.ibm.com (unknown [9.87.85.9]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTPS; Wed, 10 Jun 2026 13:03:29 +0000 (GMT) From: Sven Schnelle To: Peter Zijlstra Cc: Alexander Gordeev , Ingo Molnar , Juri Lelli , Vincent Guittot , K Prateek Nayak , Mark Brown , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , John Stultz , Vineeth Pillai , Joel Fernandes , Heiko Carstens , Vasily Gorbik , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, linux-next@vger.kernel.org, "Aaron Lu" Subject: Re: linux-next crashes in scheduler on s390 In-Reply-To: <17e75ff4-cf90-4772-9965-92a7235ca806-agordeev@linux.ibm.com> References: <17e75ff4-cf90-4772-9965-92a7235ca806-agordeev@linux.ibm.com> Date: Wed, 10 Jun 2026 15:03:26 +0200 Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Precedence: bulk X-Mailing-List: linux-next@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjEwMDEyMSBTYWx0ZWRfX8ztmBfnYQHXV Kraz8ggcYm/DAHWOnHgaXd/YMfstzjeNwl/Sy5ywFurq1VbbWHvEbOl675r9fa2myErT7f2inSN O9rjgk3I0g9yiw15Do6m0snJGGKbcL6tuBlkqzoQ2xDCXj1+TmVPYLpgnjbli1ziJ9egPUSY5l4 cs93KciyF2JkduvZ1Q51xVAtO5u08UyvodvrlgBcesy+LXyi4h6lq8zvhz5Acz/E8aBmY3wAktF 8QnxLCh/PW8zPaAHZu55h8Daat6mNW5aXHvd6HjRm2/N6TFLvAoCWXV2I9lG8Z28RqxHy6EA38A inWwX3/TKa+IlxpdUbQTpXOo2Veys0kHyKQaxkzkNIWohLusOpkro5gLK4AXFTrAQ8e3RfBuRFL DP5bl/TM1BWM74VVLw/4w4gVUkOvAYtOMB65gHcAEQ7w9MLNY58BcT/Dmh8u9NYYkOAPtcHzywG rFIuK/+nFyu40sl7kmQ== X-Authority-Analysis: v=2.4 cv=QKhYgALL c=1 sm=1 tr=0 ts=6a2960a6 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VwQbUJbxAAAA:8 a=JfrnYn6hAAAA:8 a=968KyxNXAAAA:8 a=VnNF1IyMAAAA:8 a=mU7hYW_smJ6EYCDG9gIA:9 a=1CNFftbPRP8L7MoqJWF3:22 X-Proofpoint-GUID: ecjgZR-H8jpIbbvPGWj48Djxu-XVL_ca X-Proofpoint-ORIG-GUID: iSXWIMWjLyJg4_f2SAWCjpEEN3xb70Mi X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-10_03,2026-06-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 lowpriorityscore=0 bulkscore=0 adultscore=0 phishscore=0 malwarescore=0 impostorscore=0 suspectscore=0 spamscore=0 clxscore=1011 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2606100121 Alexander Gordeev writes: > Hi All, > > Since about June 1st we're getting strace test suite (make -j$(nproc) check) > crashes on s390 in linux-next. Those are pretty easy to reproduce, but I > have not been able to nail it down to the particular commit/merge. > > I am going to bisect it, but since we are approaching v7.1 release, any > hint would be greatly appreciated! > [..] I bisected it to https://lore.kernel.org/all/20260511120627.944705718@infradead.org/ ("[PATCH v2 08/10] sched/fair: Add newidle balance to pick_task_fair()") Adding the patch proposed in https://lore.kernel.org/all/20260603095108.GA1684319@bytedance.com/ fixes the issue for me. To reproduce, running the strace test suite seems enough. If required, I can try to figure out the exact test that crashes the kernel.