Date: Thu, 27 Jul 1995 10:30:09 -0700 From: Matt Dillon <dillon@blob.best.net> To: bugs@freebsd.org Subject: More on our shell2 crashes Message-ID: <199507271730.KAA27241@blob.best.net>
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This time around it crashed with a panic("nfsreq nogrps")
I am also seeing this:
Jul 27 08:40:31 shell2 /kernel: vnode_pager_getpages: I/O read error
Jul 27 08:40:32 shell2 /kernel: vm_fault: pager input (probably hardware) error,
PID 690 failure
Jul 27 08:40:32 shell2 /kernel: vnode_pager_getpages: I/O read error
Jul 27 08:40:32 shell2 /kernel: vm_fault: pager input (probably hardware) error,
PID 690 failure
Jul 27 08:40:32 shell2 /kernel: vnode_pager_getpages: I/O read error
Jul 27 08:40:32 shell2 /kernel: vm_fault: pager input (probably hardware) error,
PID 690 failure
Jul 27 08:40:32 shell2 /kernel: vnode_pager_getpages: I/O read error
Jul 27 08:40:32 shell2 /kernel: vm_fault: pager input (probably hardware) error,
PID 690 failure
Jul 27 08:40:32 shell2 /kernel: pid 690: ftpd: uid 1905: exited on signal 6
Jul 27 08:40:29 shell2 ftpd[690]: exiting on signal 11
Jul 27 08:41:08 shell2 login: login from Sun.COM as durrell
Jul 27 08:50:28 shell2 login: login from war.ts.best.com as pgildea
Jul 27 08:52:50 shell2 login: login from shell2 as webmastr
This type of thing is occuring a whole lot... every couple of hours.
It always seems to be coming from FTPD.
The ftpd executable in this case is *ON* an NFS partition. While the
messages are not really verbose enough, I believe the failure is occuring
when shell2 tries to page in some pages from the ftpd executable over NFS.
Another thing of interest: ftpd is modes 550 root.wheel, meaning that a
screwup in the ucred *could* be causing the read failure. Thus there
could be a relationship with the panic and the vnode_pager_getpages
fazilures if ucred is somehow getting corrupted or it's reference count
is getting messed up.
I do not see a correlation with the bio_done page_busy < 0 problem so far.
--
For the time being, I have moved the ftpd executable to local disk and will
observe if the pager errors still occur.
-Matt
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