smbd process block
Goran Lowkrantz
goran.lowkrantz at ismobile.com
Tue Feb 17 15:38:00 MST 2009
Three root folders
20655 in 247 subfolders
798 in 24 subfolders
2709 in 128 subfolders
/glz
--On Tuesday, February 17, 2009 7:59 PM +0000 Sam Liddicott
<sam at liddicott.com> wrote:
> I'm mobile right now, so I can't check the log.
> Please can you say how many files are in the folders being monitored?
>
> Sam
>
> -----Original Message-----
> From: Goran Lowkrantz <goran.lowkrantz at ismobile.com>
> Sent: 16 February 2009 22:42
> To: samba-technical at lists.samba.org
> Subject: smbd process block
>
>
> I have few Samba servers running FreeBSD 7.1 were we have a problem with
> smbd process blocking for a few Vista systems that run a program that
> watch directories and files on the samba shares.
>
> On my test setup I have managed to get a hang in less than 30 min.
>
> Samba 3.2.7 is built with minimum functions and full debug. Options don't
> seems to have any impact on the problem.
>
> The PC uses Vista Business SP1 and all patches, I run a DAM program
> called IMatch ver 3.6.076 that watches for changes in the photo
> database. No other application I have tested has the same problems. For
> example, Adobe Lightroom 2.2 works without problems when setup with a
> watched folder.
>
> I have attached logfiles from samba with the following extra settings:
> debug pid = yes
> debug timestamp = no
> debug prefix timestamp = yes
> debug uid = yes
> log level = 10
>
> The PID of the server that hangs is 29162.
>
> The FreeBSD server is an up-to-date quad AMD server with 8GB running
> 7.1-STABLE. In normal operation, I see the following:
>
># sockstat | grep 445
> glz smbd 7828 23 tcp4 10.255.253.1:445
> 10.255.253.2:57355 root smbd 76917 19 tcp4 127.0.0.1:445
> *:*
> root smbd 76917 20 tcp4 10.255.253.1:445 *:*
>
> When I get the hang, it looks like this:
># sockstat | grep 445
> root smbd 7828 23 tcp4 10.255.253.1:445
> 10.255.253.2:57355 root smbd 76917 19 tcp4 127.0.0.1:445
> *:*
> root smbd 76917 20 tcp4 10.255.253.1:445 *:*
>
> and the GDB session:
># gdb /usr/local/sbin/smbd 7828
> GNU gdb 6.1.1 [FreeBSD]
> Copyright 2004 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you
> are welcome to change it and/or distribute copies of it under certain
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB. Type "show warranty" for
> details. This GDB was configured as "amd64-marcel-freebsd"...
> Attaching to program: /usr/local/sbin/smbd, process 7828
> Reading symbols from /usr/local/lib/libldap-2.3.so.2...done.
> Loaded symbols for /usr/local/lib/libldap-2.3.so.2
> Reading symbols from /usr/local/lib/liblber-2.3.so.2...done.
> Loaded symbols for /usr/local/lib/liblber-2.3.so.2
> Reading symbols from /usr/local/lib/libcups.so.2...done.
> Loaded symbols for /usr/local/lib/libcups.so.2
> Reading symbols from /usr/lib/libssl.so.5...done.
> Loaded symbols for /usr/lib/libssl.so.5
> Reading symbols from /lib/libcrypto.so.5...done.
> Loaded symbols for /lib/libcrypto.so.5
> Reading symbols from /lib/libz.so.4...done.
> Loaded symbols for /lib/libz.so.4
> Reading symbols from /lib/libm.so.5...done.
> Loaded symbols for /lib/libm.so.5
> Reading symbols from /lib/libcrypt.so.4...done.
> Loaded symbols for /lib/libcrypt.so.4
> Reading symbols from /usr/lib/libpam.so.4...done.
> Loaded symbols for /usr/lib/libpam.so.4
> Reading symbols from /usr/local/lib/libexecinfo.so.1...done.
> Loaded symbols for /usr/local/lib/libexecinfo.so.1
> Reading symbols from /usr/local/lib/libiconv.so.3...done.
> Loaded symbols for /usr/local/lib/libiconv.so.3
> Reading symbols from /usr/local/lib/libdmalloc.so.1...done.
> Loaded symbols for /usr/local/lib/libdmalloc.so.1
> Reading symbols from /usr/local/lib/libpopt.so.0...done.
> Loaded symbols for /usr/local/lib/libpopt.so.0
> Reading symbols from /lib/libthr.so.3...done.
> [New Thread 0x800a62e00 (LWP 100076)]
> Loaded symbols for /lib/libthr.so.3
> Reading symbols from /lib/libc.so.7...done.
> Loaded symbols for /lib/libc.so.7
> Reading symbols from /usr/local/lib/libsasl2.so.2...done.
> Loaded symbols for /usr/local/lib/libsasl2.so.2
> Reading symbols from /usr/local/lib/libintl.so.8...done.
> Loaded symbols for /usr/local/lib/libintl.so.8
> Reading symbols from /usr/local/lib/nss_ldap.so.1...done.
> Loaded symbols for /usr/local/lib/nss_ldap.so.1
> Reading symbols from /usr/lib/libcom_err.so.4...done.
> Loaded symbols for /usr/lib/libcom_err.so.4
> Reading symbols from /libexec/ld-elf.so.1...done.
> Loaded symbols for /libexec/ld-elf.so.1
> [Switching to Thread 0x800a62e00 (LWP 100076)]
> 0x0000000801f01d6c in select () from /lib/libc.so.7
> (gdb) directory /usr/ports/net/samba32-devel/work/samba-3.2.7/source/
> Source directories searched:
> /usr/ports/net/samba32-devel/work/samba-3.2.7/source:$cdir:$cwd
> (gdb) bt
># 0 0x0000000801f01d6c in select () from /lib/libc.so.7
># 1 0x0000000801d0f4d4 in select () from /lib/libthr.so.3
># 2 0x00000000006749fe in sys_select (maxfd=24, readfds=0x7fffffffd420,
> writefds=0x7fffffffd3a0, errorfds=0x0, tval=0x7fffffffd500)
> at lib/select.c:93
># 3 0x00000000004df64c in smbd_process () at smbd/process.c:839
># 4 0x0000000000854074 in main (argc=2, argv=0x7fffffffd638) at
> smbd/server.c:1450
> (gdb) frame 2
># 2 0x00000000006749fe in sys_select (maxfd=24, readfds=0x7fffffffd420,
> writefds=0x7fffffffd3a0, errorfds=0x0, tval=0x7fffffffd500)
> at lib/select.c:93
> 93 ret = select(maxfd,readfds2,writefds,errorfds,tval);
> (gdb) print tval
> $1 = (struct timeval *) 0x7fffffffd500
> (gdb) print *tval
> $2 = {tv_sec = 59, tv_usec = 999977}
> (gdb) The program is running. Quit anyway (and detach it)? (y or n) y
> Detaching from program: /usr/local/sbin/smbd, process 7828
>
> The following is a truss of the process until I have seen the switch to
> root as owner:
># time truss -p 8307
> gettimeofday({1234648077.989004 },0x0) = 0 (0x0)
> gettimeofday({1234648077.989081 },0x0) = 0 (0x0)
> select(24,{6 23},{},0x0,{21.288167 }) = 0 (0x0)
> gettimeofday({1234648099.279293 },0x0) = 0 (0x0)
> gettimeofday({1234648099.279370 },0x0) = 0 (0x0)
> gettimeofday({1234648099.279417 },0x0) = 0 (0x0)
> select(24,{6 23},{},0x0,{59.989982 }) = 1 (0x1)
> gettimeofday({1234648102.286493 },0x0) = 0 (0x0)
> read(23,"\0\0\0r",4) = 4 (0x4)
> read(23,"\M^?SMB2\0\0\0\0\^X\a\M-H\0\0\0"...,114) = 114 (0x72)
> geteuid(0x3e8,0x3e8,0x2,0x800adf750,0x2,0x800adf750) = 0 (0x0)
> getegid(0x3e8,0x3e8,0x2,0x801eadb8c,0xffffff006cf16a50,0x7fffffffd138) =
> 0 (0x0)
> __sysctl(0x7fffffffd0a0,0x2,0x7fffffffd0bc,0x7fffffffd0b0,0x0,0x0) = 0
> (0x0) 0.000u 0.001s 2:36.56 0.0% 0+0k 0+0io 0pf+0w
>
># sockstat | grep 445
> glz smbd 8307 23 tcp4 10.255.253.1:445
> 10.255.253.2:57438 root smbd 76917 19 tcp4 127.0.0.1:445
> *:*
> root smbd 76917 20 tcp4 10.255.253.1:445 *:*
># ps -awxl | grep 8307
> 1000 8307 8556 0 44 0 34672 7984 select IX ?? 0:04.57
> /usr/local/sbin/smbd -D -s /usr/local/etc/smb.conf
> 0 8556 3273 0 8 0 4600 1204 wait I+ p0 0:00.00 truss
> -p 8307
># sockstat | grep 445
> root smbd 8307 23 tcp4 10.255.253.1:445
> 10.255.253.2:57438 root smbd 76917 19 tcp4 127.0.0.1:445
> *:*
> root smbd 76917 20 tcp4 10.255.253.1:445 *:*
># ps -awxl | grep 8307
> 0 8307 8556 0 44 0 34672 7984 select SX ?? 0:04.57
> /usr/local/sbin/smbd -D -s /usr/local/etc/smb.conf
> 0 8556 3273 0 8 0 4600 1204 wait I+ p0 0:00.00 truss
> -p 8307
>
>
> I can recreate this at any time and the condition by killing the
> offending smbd process and the PC reconnects just fine.
>
> Hope this helps to pin this down. As I can recreate the hang, please let
> me know if there is any more information I can supply.
>
> /glz
>
> .................................................. the future isMobile
>
> Goran Lowkrantz <goran.lowkrantz at ismobile.com>
> System Architect, isMobile, Aurorum 2, S-977 75 Luleå, Sweden
> Phone: +46(0)920-75559
> Mobile: +46(0)70-587 87 82 Fax: +46(0)70-615 87 82
>
> http://www.ismobile.com ...............................................
................................................... the future isMobile
Goran Lowkrantz <goran.lowkrantz at ismobile.com>
System Architect, isMobile, Aurorum 2, S-977 75 Luleå, Sweden
Phone: +46(0)920-75559
Mobile: +46(0)70-587 87 82 Fax: +46(0)70-615 87 82
http://www.ismobile.com ...............................................
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