Date: 14 Nov 2010 05:03:44 -0000 From: Colin Percival <cperciva@FreeBSD.org> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/152228: Xen/PV panic with machdep.idle_mwait=1 Message-ID: <20101114050344.27545.qmail@xps.daemonology.net> Resent-Message-ID: <201011140510.oAE5A49f037585@freefall.freebsd.org>
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>Number: 152228 >Category: kern >Synopsis: Xen/PV panic with machdep.idle_mwait=1 >Confidential: no >Severity: serious >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sun Nov 14 05:10:04 UTC 2010 >Closed-Date: >Last-Modified: >Originator: Colin Percival >Release: FreeBSD 9.0-CURRENT >Organization: >Environment: FreeBSD HEAD ca. 2010-11-12, XEN kernel. This bug does not occur in a 2010-09-13 tree (aka. prior to mav's timer refactoring). >Description: Kernel panic: > Fatal trap 1: privileged instruction fault while in kernel mode > cpuid = 0; apic id = 00 > instruction pointer = 0x21:0xc031ac5c > stack pointer = 0x29:0xc2719c84 > frame pointer = 0x29:0xc2719c88 > code segment = base 0x0, limit 0xf9800, type 0x1b > = DPL 1, pres 1, def32 1, gran 1 > processor eflags = interrupt enabled, resume, IOPL = 0 > current process = 11 (idle: cpu0) > trap number = 1 > panic: privileged instruction fault > cpuid = 0 > KDB: stack backtrace: > #0 0xc0106057 at kdb_backtrace+0x47 > #1 0xc00d3c47 at panic+0x117 > #2 0xc032efa3 at dblfault_handler+0x3c3 > #3 0xc032f8ad at trap+0x5ed > #4 0xc03150bb at alltraps+0x1b > #5 0xc031acb0 at cpu_idle+0x30 > #6 0xc00f9133 at sched_idletd+0x263 > #7 0xc00aa7a8 at fork_exit+0xb8 > #8 0xc0315134 at fork_trampoline+0x8 > Uptime: 1s The privileged instruction fault is being triggered by mwait. >How-To-Repeat: >Fix: Setting machdep.idle_mwait=0 prevents this panic. >Release-Note: >Audit-Trail: >Unformatted:
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