Date: Sat, 27 Dec 2003 14:29:32 +0100 From: Oliver Brandmueller <ob@e-Gitt.NET> To: David Malone <dwmalone@maths.tcd.ie> Cc: freebsd-current@freebsd.org Subject: Re: file descriptor leak in 5.2-RC Message-ID: <20031227132932.GA86308@e-Gitt.NET> In-Reply-To: <200312271253.aa04019@salmon.maths.tcd.ie> References: <20031227123148.GB77531@e-Gitt.NET> <200312271253.aa04019@salmon.maths.tcd.ie>
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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 (here you find not only perl, but also exim and so on, but it seems it's perl that needs the most - but perl is also the most run process on the machine). Hmm, not easy to get around /dev/null though ;-) What the heck can go wrong with perl and /dev/null ?! - Oliver -- | Oliver Brandmueller | Offenbacher Str. 1 | Germany D-14197 Berlin | | Fon +49-172-3130856 | Fax +49-172-3145027 | WWW: http://the.addict.de/ | | Ich bin das Internet. Sowahr ich Gott helfe. | | Eine gewerbliche Nutzung aller enthaltenen Adressen ist nicht gestattet! |
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