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Cc: Jan Polensky From: Thomas Richter Subject: perf stat dumps core when CPU offline Organization: IBM Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: wzd61_0cwWOdY6JZWzDdFVE_Ob2Lf5UO X-Authority-Analysis: v=2.4 cv=Ir0Tsb/g c=1 sm=1 tr=0 ts=69303917 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=IkcTkHD0fZMA:10 a=wP3pNCr1ah4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=vBw0vaNz1gO5Gv2NntgA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=ZXulRonScM0A:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTI5MDAyMCBTYWx0ZWRfX/aFMEEA8pXMi LQHWDQ4fmGL7Y7YMzerUg5m48hE+Z7a8tzHLn0phniBs3mOsHSwKakIvIwh3hF3hbaTdnsCynk7 eC7y9ZjTQ9mHtr+BxnktZrD+MvXvivd0Pv+LvYRxqgw7TtOGr6SVi5x9bJ+SsZJgoPW04GQN0I6 mjByIelAp8eoqj/OmRgidDV16hT0UMZOrCyn7x4UEv/n+Qvu3CB47Kx/A0MfBWkDJ15DlGvUiXu l6OAhZsg7LMucGiECTmf/6DDtTanDUNsTRTY1M+AjGJZctxLDjOi1ZQhBmlkNET/hT2fIZyCmBx wKbRAuut60rFXQ3IcLcz7s3o0ViDKCTuOsS3cdDn42dZTewNcZFkqGTAGnYs2f0m4+kSkuxJasd n4ET7ojj6JsW/6ssnmapsMR+mhaR7g== X-Proofpoint-GUID: wzd61_0cwWOdY6JZWzDdFVE_Ob2Lf5UO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-12-03_01,2025-11-27_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 adultscore=0 impostorscore=0 clxscore=1015 priorityscore=1501 bulkscore=0 spamscore=0 lowpriorityscore=0 suspectscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2511290020 Hi all, Is this a known issue? Trying to do a perf stat on a CPU which is offline. # echo 1 > /sys/devices/system/cpu/cpu1/online # perf stat -C1 -e cycles -- true Performance counter stats for 'CPU(s) 1': 123,965 cycles 0.000356838 seconds time elapsed # echo 0 > /sys/devices/system/cpu/cpu1/online # perf stat -C1 -e cycles -- true WARNING: A requested CPU in '1' is not supported by PMU 'cpum_cf' (CPUs 0,2-7) for event 'cycles' Segmentation fault (core dumped) perf stat -C1 -e cycles -- true # This happens on linux-next and linux. Thanks a lot -- Thomas Richter, Dept 3303, IBM s390 Linux Development, Boeblingen, Germany -- IBM Deutschland Research & Development GmbH Vorsitzender des Aufsichtsrats: Wolfgang Wendt Geschäftsführung: David Faller Sitz der Gesellschaft: Böblingen / Registergericht: Amtsgericht Stuttgart, HRB 243294