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Thu, 4 Sep 2025 12:24:38 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 584COc5D036994 for bugs@FreeBSD.org; Thu, 4 Sep 2025 12:24:38 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 289297] Intel Xeon 6 with high number of threads : kernel panic Date: Thu, 04 Sep 2025 12:24:38 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 15.0-CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: benoit@neviani.fr X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter attachments.created Message-ID: Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Bug reports List-Archive: https://lists.freebsd.org/archives/freebsd-bugs List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-bugs@FreeBSD.org MIME-Version: 1.0 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D289297 Bug ID: 289297 Summary: Intel Xeon 6 with high number of threads : kernel panic Product: Base System Version: 15.0-CURRENT Hardware: amd64 OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: benoit@neviani.fr Created attachment 263484 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D263484&action= =3Dedit acpidump -dt (zipped version, too big) Hi, We have two brand new servers with 2x Intel 6787p, 86 cores / 172 threads e= ach, total of 344 threads. A user from FreeBSD forum has a good idea on what is happening : The problem is that an attempt is made to use APIC IDs larger than 255. Wit= h 2 CPUs, each having 86 cores and each core having 2 threads, the number of CP= Us as seen by FreeBSD becomes quite large. With each CPU having its own APIC, = APIC IDs larger than 255 have to be used. There are some problems reported with that. See , and And he suggested that I am opening this ticket and attaching the acpidump -= dt Thanks ! --=20 You are receiving this mail because: You are the assignee for the bug.=