Howdy! FreeBSD 4-10 I have some machines that run customers cgi stuff. These machines have started to hang and become unresponsive. At first I thought it was a hardware issue, but I discovered in a cyclades log the following stuff that got logged to the console which explains the cause of the system hangs/failures. vnode_pager_putpages: residual I/O 65536 at 347 vnode_pager_putpages: I/O error 28] vnode_pager_putpages: residual I/O 65536 at 285] Zillions of them. The only way to recover the machine is to power cycle it. From what I can tell from google etc.. and someone elses experience it is probably the consequence of someone filling up /var/tmp or something. Should a non root user program be able to DOS a machine like this? or What is the cause and/or fix for this? thanx - steve "The age of the Internet has a right to its own music." http://www.linuxsuite.org
On Thu, Jan 01, 1970 at 12:00:00AM +0000, Steve Shorter wrote:> Howdy! > > FreeBSD 4-10 > > I have some machines that run customers cgi stuff. > These machines have started to hang and become unresponsive. > At first I thought it was a hardware issue, but I discovered in > a cyclades log the following stuff that got logged to the > console which explains the cause of the system hangs/failures. > > vnode_pager_putpages: residual I/O 65536 at 347 > vnode_pager_putpages: I/O error 28] > vnode_pager_putpages: residual I/O 65536 at 285]Aha! also at the same time I get in syslog /kernel: pid 6 (syncer), uid 0 on /chroot/tmp: file system full Whats happening? Can a full filesystem bring the thing down? Ideas? Fixes? thanx - steve> > Zillions of them. > > The only way to recover the machine is to power cycle > it. > > From what I can tell from google etc.. and someone elses > experience it is probably the consequence of someone filling > up /var/tmp or something. > > Should a non root user program be able to DOS > a machine like this? or What is the cause and/or fix for this? > > > thanx - steve > > > > > > > "The age of the Internet has a right to its own music." > > http://www.linuxsuite.org > > ----- End forwarded message ----- > >
On Fri, 8 Oct 2004, Steve Shorter wrote:> > I have some machines that run customers cgi stuff. > > These machines have started to hang and become unresponsive. > > At first I thought it was a hardware issue, but I discovered in > > a cyclades log the following stuff that got logged to the > > console which explains the cause of the system hangs/failures. > > > > vnode_pager_putpages: residual I/O 65536 at 347 > > vnode_pager_putpages: I/O error 28] > > vnode_pager_putpages: residual I/O 65536 at 285] > > Aha! also at the same time I get in syslog > > /kernel: pid 6 (syncer), uid 0 on /chroot/tmp: file system full > > Whats happening? Can a full filesystem bring the thing down? > Ideas? Fixes?Ideally not, but many UNIX programs respond poorly to being out of memory and disk space ("No space, wot?"). Are you using a swap file, and if so, how did you create the swapfile? Are you using sparse files much? Robert N M Watson FreeBSD Core Team, TrustedBSD Projects robert@fledge.watson.org Principal Research Scientist, McAfee Research