Date: Thu, 04 Sep 2025 12:24:38 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 289297] Intel Xeon 6 with high number of threads : kernel panic Message-ID: <bug-289297-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289297 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=263484&action=edit acpidump -dt (zipped version, too big) Hi, We have two brand new servers with 2x Intel 6787p, 86 cores / 172 threads each, 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. With 2 CPUs, each having 86 cores and each core having 2 threads, the number of CPUs 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 <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288122>, <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287492>; and <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273022>; And he suggested that I am opening this ticket and attaching the acpidump -dt Thanks ! -- You are receiving this mail because: You are the assignee for the bug.home | help
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