Date: Tue, 3 Jun 1997 19:18:40 -0700 (PDT) From: John Sin <jsin@broadcom.com> To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: kern/3771: bug report for 2.2.2-RELEASE Message-ID: <199706040218.TAA02578@airbus.broadcom.com> Resent-Message-ID: <199706040220.TAA11237@hub.freebsd.org>
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>Number: 3771 >Category: kern >Synopsis: NFS hangs when writing to local FS re-mounted via NFS >Confidential: no >Severity: serious >Priority: high >Responsible: freebsd-bugs >State: open >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Tue Jun 3 19:20:01 PDT 1997 >Last-Modified: >Originator: John Sin >Organization: Broadcom Corporation >Release: FreeBSD 2.2.2-RELEASE i386 >Environment: 2.2.2-RELEASE FreeBSD 2.2.2-RELEASE #0: Sat May 31 15:24:00 PDT 1997 DELL Pentium Pro Edge 2100/180. 64MB RAM. On-Board AIC7880 SCSI plus Adaptec 2940 UW. 3COM 3c595 100BaseTX. 3 SCSI hard drives and SCSI CDROM. DELL Pentium II H266. 96MB RAM. On-Board EIDE controller. 3COM 3c905 100BaseTX. 1 IDE hard drive and an IDE CDROM >Description: NFS hangs, when writing a sizable file to a local filesystem that has been re-mounted via NFS (typically via amd, but not necessarily). The reason for re-mounting local filesystem via NFS is so that directory names can be kept the same across all machines. Small files can be written ok to such a filesystem (it seems). Large files can be read OK. Whenever the system dies, all NFS daemons are in 'D' state, with very high priority. Here's a sample of "ps axl | grep nfs": UID PID PPID CPU PRI NI VSZ RSS WCHAN STAT TT TIME COMMAND 0 96 1 9 2 0 232 116 accept Is ?? 0:00.01 nfsd: master 0 100 96 0 -14 0 224 104 uihget D ?? 0:00.51 nfsd: server 0 101 96 0 -1 0 224 104 nfsrcv D ?? 0:00.05 nfsd: server 0 102 96 0 -14 0 224 104 uihget D ?? 0:00.01 nfsd: server 0 103 96 0 -14 0 224 104 uihget D ?? 0:00.00 nfsd: server 0 109 1 0 2 0 208 88 sbwait D ?? 0:00.24 nfsiod -n 4 0 110 1 0 -1 0 208 88 nfsrvc D ?? 0:00.06 nfsiod -n 4 0 111 1 0 -1 0 208 88 nfsrvc D ?? 0:00.01 nfsiod -n 4 0 112 1 0 -1 0 208 88 nfsrvc D ?? 0:00.01 nfsiod -n 4 100 385 170 0 -1 0 260 156 nfsrvc D+ ?? 0:00.14 cp /tmp/file It does appear that NFS in general works -- at least I can mount remote machines' filesystems and copy data in and out without the system hanging. I only experience NFS problem with local filesystem re-mounted via NFS. >How-To-Repeat: cat /kernel > /tmp/junkfile cat /kernel >> /tmp/junkfile cat /kernel >> /tmp/junkfile [hopefully this results in /tmp/junkfile > 3MB] mount localhost:/ mnt cp /mnt/tmp/junkfile /tmp/junkfile.copy [this works ok cp /tmp/junkfile /mnt/tmp/junkfile.dead [this hangs the system] >Fix: Unknown >Audit-Trail: >Unformatted:
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