Am 09.03.2010 um 13:29 schrieb Pawel Jakub Dawidek:
> On Tue, Mar 09, 2010 at 10:15:53AM +0100, Stefan Bethke wrote:
>> Over the past couple of months, I've more or less regularly observed
>> machines having more and more processes stuck in the zfs wchan. The
>> processes never recover from that, and trying to reboot only gets the entire
>> system stuck, without any console messages. I can enter the debugger, and I
>> have saved a couple of dumps.
>>
>> The situation seems to be triggered by zfs receive'ing snapshots from the
>> sister machine (both synchronize their active ZFS filesystems to each other,
>> using zfs send and zfs receive). It appears it's the receiving causing
>> trouble.
>>
>> Both machines run 8-stable from mid-February, with a single-disk ZFS pool,
>> with ARC limited to 512M, prefetch and ZIL disabled via loader.conf.
>>
>> What should I be looking at to further diagnose?
>
> What kind of hardware do you have there? There is 3-way deadlock I've a
> fix for which would be hard to trigger on single or dual core machines.
FreeBSD lokschuppen.zs64.net 8.0-STABLE FreeBSD 8.0-STABLE #24: Sat Feb 13
11:20:03 UTC 2010 r...@lokschuppen.zs64.net:/usr/obj/usr/src/sys/EISENBOOT
amd64
Copyrig
ht (c) 1992-2010 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 8.0-STABLE #24: Sat Feb 13 11:20:03 UTC 2010
r...@lokschuppen.zs64.net:/usr/obj/usr/src/sys/EISENBOOT amd64
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Core(TM)2 Duo CPU E7300 @ 2.66GHz (2666.65-MHz K8-class CPU)
Origin = "GenuineIntel" Id = 0x10676 Stepping = 6
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,C
MOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
Features2=0x8e39d<SSE3,DTES64,MON,DS_CPL,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1>
AMD Features=0x20100800<SYSCALL,NX,LM>
AMD Features2=0x1<LAHF>
TSC: P-state invariant
real memory = 4294967296 (4096 MB)
avail memory = 4081422336 (3892 MB)
> Feel free to try the fix:
>
> http://people.freebsd.org/~pjd/patches/zfs_3way_deadlock.patch
I'll give it a shot on one of the two boxes.
Stefan
--
Stefan Bethke <s...@lassitu.de> Fon +49 151 14070811
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