kern/160790: [fusefs] [panic] VPUTX: negative ref count with
FUSE
Allen Landsidel
landsidel.allen at gmail.com
Thu May 31 19:40:03 UTC 2012
The following reply was made to PR kern/160790; it has been noted by GNATS.
From: Allen Landsidel <landsidel.allen at gmail.com>
To: bug-followup at FreeBSD.org
Cc:
Subject: Re: kern/160790: [fusefs] [panic] VPUTX: negative ref count with
FUSE
Date: Thu, 31 May 2012 15:30:47 -0400
This bug continues to occur on a new system, different 'hardware'. The
system is running MooseFS and was migrated some time ago to an VMWare
ESX 5 VM, 64bit.
OS version is: 8.2-STABLE FreeBSD 8.2-STABLE #0: Fri Oct 14 00:11:10 UTC
2011
root at freebsd-82-64.master.concord.internal:/usr/obj/usr/src/sys/GENERIC
amd64
My initial suspicion is there is some kind of race involved, as the
error only seems to occur during times of heavy write load.
The virtualized system does reboot on the panic however, though the
physical machine the initial bug report regards did not.
Panic:
panic: vputx: negative ref cnt
cpuid = 1
KDB: stack backtrace:
#0 0xffffffff80607050 at kdb_backtrace+0x60
#1 0xffffffff805d4e74 at panic+0x1b4
#2 0xffffffff80666e31 at vputx+0x101
#3 0xffffffff8066702e at vput+0xe
#4 0xffffffff8067206c at vn_open_cred+0x56c
#5 0xffffffff8067210c at vn_open+0x1c
#6 0xffffffff8066fc03 at kern_openat+0x163
#7 0xffffffff8066ff89 at kern_open+0x19
#8 0xffffffff8066ffa8 at open+0x18
#9 0xffffffff808c6301 at amd64_syscall+0x301
#10 0xffffffff808aee0c at Xfast_syscall+0xfc
panic: bufwrite: buffer is not busy???
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