Bug#406902: kernel-source: NFS data loss
Package: kernel-source
Version: 2.6.8_16sarge6
Severity: important
Maybe this is related to http://bugs.debian.org/255931 (and concomitant
discussion on nfs@lists.sourceforge.net). I only guess that this is caused
by a "spurious" ESTALE error return.
Running on machine "rome", as "plain user" psz:
while :; do date; perl -e 'mkdir "tdir"; chdir "tdir"; open F, ">tscr"; print F "echo hello; sleep 2; /bin/pwd; echo bye\n"; close F; system "sh tscr"; mkdir("dir$_"),rmdir("dir$_") foreach 1..100; system "sh tscr"; unlink "tscr"; chdir ".."; rmdir "tdir"'; done
and (also on "rome"), as root:
while :; do date; lsof | grep psz | grep -E 'cwd|deleted|dir' | grep -v xterm; sleep 1; done
occasionally produces
Mon Jan 15 08:12:40 EST 2007
hello
/pisa/users/amstaff/psz/tdir
bye
shell-init: could not get current directory: getcwd: cannot access parent directories: No such file or directory
hello
/bin/pwd: cannot get current directory: No such file or directory
bye
Mon Jan 15 08:12:45 EST 2007
hello
/pisa/users/amstaff/psz/tdir
bye
hello
Mon Jan 15 08:12:48 EST 2007
Mon Jan 15 08:12:41 EST 2007
bash 13107 psz cwd DIR 0,15 8192 5800001 /pisa/users/amstaff/psz (pisa:/usr/users)
perl 13963 psz cwd DIR 0,15 4096 5800702 /pisa/users/amstaff/psz/tdir (pisa:/usr/users)
sh 13964 psz cwd DIR 0,15 4096 5800702 /pisa/users/amstaff/psz/tdir (pisa:/usr/users)
sh 13964 psz 255r REG 0,15 40 5800712 /pisa/users/amstaff/psz/tdir/tscr (pisa:/usr/users)
sleep 13965 psz cwd DIR 0,15 4096 5800702 /pisa/users/amstaff/psz/tdir (pisa:/usr/users)
Mon Jan 15 08:12:42 EST 2007
bash 13107 psz cwd DIR 0,15 8192 5800001 /pisa/users/amstaff/psz (pisa:/usr/users)
perl 13963 psz cwd unknown 0,15 /pisa/users/amstaff/psz/tdir (pisa:/usr/users)
Mon Jan 15 08:12:44 EST 2007
bash 13107 psz cwd DIR 0,15 8192 5800001 /pisa/users/amstaff/psz (pisa:/usr/users)
perl 13963 psz cwd unknown 0,15 /pisa/users/amstaff/psz/tdir (deleted) (pisa:/usr/users)
sh 13984 psz cwd unknown 0,15 /pisa/users/amstaff/psz/tdir (deleted) (pisa:/usr/users)
sh 13984 psz 255r REG 0,15 40 5800712 /pisa/users/amstaff/psz/tdir/tscr (pisa:/usr/users)
sleep 13985 psz cwd unknown 0,15 /pisa/users/amstaff/psz/tdir (deleted) (pisa:/usr/users)
Mon Jan 15 08:12:45 EST 2007
bash 13107 psz cwd DIR 0,15 8192 5800001 /pisa/users/amstaff/psz (pisa:/usr/users)
perl 13995 psz cwd DIR 0,15 4096 5800702 /pisa/users/amstaff/psz/tdir (pisa:/usr/users)
sh 13996 psz cwd DIR 0,15 4096 5800702 /pisa/users/amstaff/psz/tdir (pisa:/usr/users)
sh 13996 psz 255r REG 0,15 40 5800712 /pisa/users/amstaff/psz/tdir/tscr (pisa:/usr/users)
sleep 13997 psz cwd DIR 0,15 4096 5800702 /pisa/users/amstaff/psz/tdir (pisa:/usr/users)
Mon Jan 15 08:12:46 EST 2007
Settings:
rome# grep psz /etc/passwd
psz:x:1001:1001:Paul Szabo:/users/amstaff/psz:/bin/bash
rome# ls -l /users/amstaff
lrwxrwxrwx 1 root root 19 Jan 19 2005 /users/amstaff -> /pisa/users/amstaff
rome# mount | grep pisa/users
pisa:/usr/users on /pisa/users type nfs (rw,bg,rsize=8192,wsize=8192,addr=129.78.69.136)
(pisa uses default root_squash in its /etc/exports).
Cheers,
Paul Szabo psz@maths.usyd.edu.au http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics University of Sydney Australia
-- System Information:
Debian Release: 3.1
Architecture: i386 (i686)
Kernel: Linux 2.6.8-spm1.7
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
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