Subject: kern/8554: smbd hangs in semop when servicing requests
To: None <>
From: Ted Lemon <>
List: netbsd-bugs
Date: 10/04/1999 13:26:08
>Number:         8554
>Category:       kern
>Synopsis:       smbd hangs in semop when servicing requests
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people (Kernel Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Oct  4 13:20:01 1999
>Originator:     Ted Lemon
	Internet Software Consortium
>Release:        September 24, 1999
	Intel Pentium II
	NetBSD 1.4K
	ELF libraries from ``make build'' of -current
System: NetBSD tundruk 1.4K NetBSD 1.4K (TUNDRUK) #0: Fri Sep 24 18:47:11 EDT 1999 mellon@tundruk:/var/src/src/sys/arch/i386/compile/TUNDRUK i386

	When I start samba with a configuration that was working prior to
	the SysV IPC updates on August 24, it fails to serve SMB clients.
	The symptom from the SMB client side is a timeout.   From the server
	side, it logs the message "Trying sysv shmem open of size 1048576"
	and then hangs (this is with debug level = 127).   When I run ktrace
	on it, it is hanging in the semop system call:

 25802 smbd     GIO   fd 3 wrote 41 bytes
       "  Trying sysv shmem open of size 1048576
 25802 smbd     RET   write 41/0x29
 25802 smbd     CALL  semget(0x280269,0,0)
 25802 smbd     RET   semget 65536/0x10000
 25802 smbd     CALL  __semctl13(0x10000,0,0x2,0xefbfd4d4)
 25802 smbd     RET   __semctl13 0
 25802 smbd     CALL  __semctl13(0x10000,0,0x5,0xefbfd4d4)
 25802 smbd     RET   __semctl13 0
 25802 smbd     CALL  __semctl13(0x10000,0,0x4,0xefbfd4d4)
 25802 smbd     RET   __semctl13 0
 25802 smbd     CALL  kill(0,0)
 25802 smbd     RET   kill 0
 25802 smbd     CALL  __semctl13(0x10000,0,0x1,0xefbfd4d4)
 25802 smbd     RET   __semctl13 0
 25802 smbd     CALL  semop(0x10000,0xefbfd49c,0x1)

	I have been able to work around this by hacking samba to use
	MMAP for locking instead of SYSV IPC.   I don't know if this is
	actually the result of the changes to SYSV IPC that were made on
	the 24th of August, but it's the only smoking gun I can see.
	Install the Samba package.   Set up a /etc/smb.conf, start smbd
	and nmbd, and then try to mount a share from an NT box.   Here is
	a sample smb.conf file, in case you don't have one:

			browsable = True
			dns proxy = yes
			encrypt passwords = yes
			log file = /var/log/samba.log
			mangled names = no
			null passwords = no
			time server = yes
			workgroup = home
			remote announce =
			remote announce =
			debug level = 127
			user = jschmoe
			path = /udir/jschmoe
                        writeable = yes

You also need a /etc/samba/lmhosts file:	grosse	tundruk	dulwa

And a /etc/samba/smbpasswd file, which you can create with the smbpasswd