smbd process block
Goran Lowkrantz
goran.lowkrantz at ismobile.com
Wed Feb 18 11:43:12 MST 2009
One dump available, starting before the connection is done, stopping when
the application has gone Not responding:
<http://people.hidden-powers.com/~glz/smbimatch.pcap.gz>
/glz
--On Wednesday, February 18, 2009 10:06 AM +0000 Sam Liddicott
<sam at liddicott.com> wrote:
> * Goran Lowkrantz wrote, On 17/02/09 22:38:
>> Three root folders
>> 20655 in 247 subfolders
>> 798 in 24 subfolders
>> 2709 in 128 subfolders
> It would be good if you could send a tcp dump that we could run through
> wireshark
>
> Something like
>
> tcpdump -n -i ETHNAME host SERVERNAME and host CLIENT NAME and \( port
> 445 or port 139 \) -s 1500 -w tcp.dump
>
> [we should probably really do -s 65535 but I don't think you are doing
> any big reads or writes that are interested in]
>
> and then stimulate the error as soon as you can.
>
> The tcp.dump log file may be very large, but you can either load it into
> wireshark and see what is going on, or you could compress it and put it
> somewhere we could download it.
>
> [You might also want to be careful of using any passwords that matter.]
>
> Then we can see if it hangs "doing nothing" or "doing something". I've
> seen some infinite loop hangs doing dir reads on a NAS box which doesn't
> continue properly.
>
> Sam
>>
>> /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 ...............................................
................................................... 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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