Date: Sat, 4 Nov 2006 07:11:46 GMT From: Kevin Thompson<antiduh@csh.rit.edu> To: freebsd-gnats-submit@FreeBSD.org Subject: alpha/105134: 'panic: lockmgr: thread ... not exclusive lock owner' on SMP Alpha EV6 machine Message-ID: <200611040711.kA47BkDj009975@www.freebsd.org> Resent-Message-ID: <200611040720.kA47KKWE090965@freefall.freebsd.org>
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>Number: 105134
>Category: alpha
>Synopsis: 'panic: lockmgr: thread ... not exclusive lock owner' on SMP Alpha EV6 machine
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-alpha
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Nov 04 07:20:20 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator: Kevin Thompson
>Release: 6.1-release, 6.2-beta3
>Organization:
Computer Science House at Rochester Institute of Technology
>Environment:
6.1-RELEASE ALPHA, 6.2-BETA3 ALPHA.
>Description:
Reproduced on FreeBSD 6.1-RELEASE, 6.2-BETA3 with SMP and PREEMPTION enabled.
Currently trying 6.2-PRERELEASE with preemption disabled, and if that doesn't work, turn off SMP.
Under heavy disk access and cpu load (eg make -j2 buildkernel), the machine deadlocks with the following message:
panic: lockmgr: thread 0xfffffc005f9a4000, not exclusive lock holder 0xfffffc00487e1500 unlocking cpuid = 1
It does not display anything more, it does not reboot, it just stops right there with that message. The machine is completely unresponsive from every interface - ethernet, serial console, vga console, etc.
The machine is a dual 500mhz alpha EV6 with 1.5GB of RAM,
System disk:
da0 at isp0 bus 0 target 0 lun 0
da0: <IBM DDYS-T18350N S80D> Fixed Direct Access SCSI-3 device
da0: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing Enabled
da0: 17501MB (35843670 512 byte sectors: 255H 63S/T 2231C)
Controller for system disk:
isp0: <Qlogic ISP 1020/1040 PCI SCSI Adapter> port 0x1000-0x10ff mem 0x1010000-0x1010fff irq 47 at device 7.0 on pci1
isp0: interrupting at TSUNAMI irq 47
isp0: [GIANT-LOCKED]
The important bits of bootup:
ST6600
AlphaPC 264DP 500 MHz, 500MHz
8192 byte page size, 2 processors.
CPU: EV6 (21264) major=8 minor=7 extensions=0x303<BWX,FIX,MVI,PRECISE>
OSF PAL rev: 0x2004500020157
real memory = 1607819264 (1533 MB)
avail memory = 1567784960 (1495 MB)
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
cpu0 (BSP): PAL ID: 0
cpu1 (AP): PAL ID: 1
tsunami0: <21271 Core Logic chipset>
>How-To-Repeat:
Heavy disk i/o and cpu usage on alpha w/ SMP & PREEMPTION.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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