Oplock problem in 2.0.7 locks up Samba completely
Dr Andreas F Muller
afm at othello.ch
Tue Aug 15 22:49:17 GMT 2000
first of all: thank you all for you excellent work on Samba.
However, I dare to complain about a problem with oplocks that of-
ten plagues the server here. The server is used for just about
everything, Samba is used for file and print services but also as
a gateway to a Pervasive SQL database (via a named pipe).
Usually after a few days of perfect function (just over two weeks
at the last occurrence of the problem), all Samba services lock
up completely. The log is filled with messages like the follow-
ing:
[2000/08/14 09:49:14, 0] smbd/oplock.c:request_oplock_break(1204)
request_oplock_break: no response received to oplock break request to pid 5060 on port 3708 for
dev = 3a01, inode = 16484
for dev = 3a01, inode = 16484, tv_sec = 3997a286, tv_usec = c5bf0
[2000/08/14 09:49:46, 0] smbd/oplock.c:request_oplock_break(1204)
request_oplock_break: no response received to oplock break request to pid 5060 on port 3708 for
dev = 3a01, inode = 16484
for dev = 3a01, inode = 16484, tv_sec = 3997a286, tv_usec = c5bf0
The system runs a Linux 2.2.14-SMP kernel on a recent Intel
board with one Xeon 550MHz processor and 256MB Ram. The share
filesystems are ext2 file sys- tems on a lvm managed logical
volume.
In this situation, Samba must be stopped and restarted. It is not
clear what causes the problem (if it were, this could be used as
a simple but very effective denial of service attack against Sam-
ba servers).
Even if the problem actually comes from some silly application,
it should not cause Samba to lock out all users! I could under-
stand two blocked users that compete for a lock, but not all. Is
there a fix for this problem?
How can I further help to analyse the problem?
Mit herzlichem Gruss
Andreas Mueller
PS: I tried to subscribe to the list, but did never get a confir-
mation from listproc at samba.org. And the search engine seems
to have been discontinued. So please reply to me as well as
to the list, if you like.
--
Dr. Andreas Mueller Beratung und Entwicklung
Bubental 53, 8852 Altendorf afm at othello.ch
Tel: 055/4621483 Fax: 0554621485 Natel: 079/3556714
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