[Xen-devel] Very odd filesystem problem in dom0

[urmk@xxxxxxxxxxxxx]

I've got a really unique problem.  Running xeno-bk changeset 1364, I get
random filesystem/bash globbing problems in dom0.  Same system under 2.4.26
without xeno, no issues at all.

In this case the dom0 distribution is slackware, running ext3, on an Adaptec
AIC-7892P U160/m scsi controller.

The problem manifests itself most easily with 'ls':

"""
root@durandal:~# ls /var/adm/packages/
aaa_base-10.0.0-noarch-1       guile-1.6.4-i486-1              
pango-1.4.0-i486-1
aaa_elflibs-9.2.0-i486-1       gzip-1.3.3-i386-2               
pciutils-2.1.11-i486-5
acpid-1.0.3-i486-1             hdparm-5.5-i486-1               pcre-4.5-i486-2
...
"""
works as expected.

"""
root@durandal:~# ls /var/adm/packages/*
: : No such file or directory
: : No such file or directory
...
"""

fails, as does:
"""
root@durandal:~# cd /var/log/packages/
root@durandal:/var/log/packages# ls *
: : No such file or directory
...
"""

Now things get really strange:
"""
root@durandal:/var/log/packages# for x in *; do echo $x; done
aaa_base-10.0.0-noarch-1
aaa_elflibs-9.2.0-i486-1
acpid-1.0.3-i486-1
at-3.1.8-i486-2
...

root@durandal:/var/log/packages# echo *
aaa_base-10.0.0-noarch-1 aaa_elflibs-9.2.0-i486-1 acpid-1.0.3-i486-1 
...

root@durandal:/var/log/packages# ls `echo *`
: : No such file or directory
: : No such file or directory
...

root@durandal:/var/log/packages# strace ls *
: : command not found

root@durandal:/var/log/packages# cd

root@durandal:# strace ls /var/log/packages/*
: : command not found

root@durandal:~# ls *
/usr/bin/ls: *: No such file or directory

root@durandal:~# strace ls *
execve("/usr/bin/ls", ["ls", "*"], [/* 28 vars */]) = 0
brk(0)                                  = 0x805a000
...
stat64("*", 0x805b6f4)                  = -1 ENOENT (No such file or directory)
lstat64("*", 0x805b6f4)                 = -1 ENOENT (No such file or directory)
write(2, "ls: ", 4ls: )                     = 4
write(2, "*", 1*)                        = 1
open("/usr/share/locale/en_US/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No 
such file or directory)
open("/usr/share/locale/en/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such 
file or directory)
write(2, ": No such file or directory", 27: No such file or directory) = 27
write(2, "\n", 1
"""

So strace only works in SOME of the directories that exhibit this problem, 
and when it fails, it's really trying to stat a literal '*' - the bash globbing
fails randomly.

Normally I'd accept this as being a borked install that I'm trying to run as
dom0, but none of this behavior exhibits itself under the 2.4.26 stock kernel.

I did a make clean and a fresh make world to be sure I didn't have any old 
object files laying around, no change in the behavior.  The filesystem fsck -f's
clean under both xeno and non-xeno.

-m



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