Date: Sat, 27 Dec 2003 14:01:21 +0000 (UTC) From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: Oliver Brandmueller <ob@e-Gitt.NET> Cc: freebsd-current@freebsd.org Subject: Re: file descriptor leak in 5.2-RC Message-ID: <Pine.BSF.4.53.0312271351310.21415@e0-0.zab2.int.zabbadoz.net> In-Reply-To: <20031227132932.GA86308@e-Gitt.NET> References: <20031227123148.GB77531@e-Gitt.NET> <200312271253.aa04019@salmon.maths.tcd.ie> <20031227132932.GA86308@e-Gitt.NET>
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On Sat, 27 Dec 2003, Oliver Brandmueller wrote: > Hi. > > On Sat, Dec 27, 2003 at 12:53:20PM +0000, David Malone wrote: > > Hmmm - could be... The following patch to fstat prints the data > > field for inodes in fstat's output. I'd suggest: > > > > 1) Run until you have alot of the same inode stuck open. > > 2) Run pstat -f and get the data value. > > 3) Run fstat and grep for the data value in question. > > > > You might need to do 3 a few times, depending on how long the phantom > > inode is actually open for while the program is running. I wonder > > if it is some sort of device cloning/refcounting problem? > > It's /dev/null ! > > lupin# pstat -f > 2779/262144 open files > LOC TYPE FLG CNT MSG DATA OFFSET > c7effd8c pipe RW 2 0 c7968560 0 > c7a9d880 pipe RW 3 0 c789a35c 0 > c7fbadd0 inode RW 1 0 c72fae38 0 > c7aea374 inode RW 1 0 c72fae38 0 > c7fbad8c inode RW 1 0 c72fae38 0 > c7f9f550 inode RW 1 0 c72fae38 0 > c7fba61c inode RW 1 0 c72fae38 0 > [...] > > lupin# fstat | fgrep c72fae38 | head -20 > vscan perl 8817 0 0xc72fae38 /dev 8 crw-rw-rw- null r > vscan perl 8817 1 0xc72fae38 /dev 8 crw-rw-rw- null w > vscan perl 8817 2 0xc72fae38 /dev 8 crw-rw-rw- null w > vscan perl 8718 0 0xc72fae38 /dev 8 crw-rw-rw- null r > vscan perl 8718 1 0xc72fae38 /dev 8 crw-rw-rw- null w > vscan perl 8718 2 0xc72fae38 /dev 8 crw-rw-rw- null w when daemonizing you open /dev/null and dup2 it to 0,1,2 to detach from stdin,out,err. -- Bjoern A. Zeeb bzeeb at Zabbadoz dot NeT 56 69 73 69 74 http://www.zabbadoz.net/
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