samba - Oct 2020 - segfault during net rpc printer migrate drivers

Hi

I am trying to migrate an old printserver from one samba4 (4.8.11 on 
CentOS-6) server to a newer one (4.11.2 on CentOS-8)
using

net rpc printer migrate all

The migration of queue, forms, securitty, settings works, during the 
migration of the drivers (net rpc printer migrate drivers)? the command 
dumps core at the first driver

Here a level10 output

 ???? spoolss_AddPrinterDriver: struct spoolss_AddPrinterDriver
 ??????? in: struct spoolss_AddPrinterDriver
 ??????????? servername?????????????? : *
 ??????????????? servername?????????????? : '\\127.0.0.1'
 ??????????? info_ctr???????????????? : *
 ??????????????? info_ctr: struct spoolss_AddDriverInfoCtr
 ??????????????????? level??????????????????? : 0x00000003 (3)
 ??????????????????? info???????????????????? : union 
spoolss_AddDriverInfo(case 3)
 ??????????????????? info3??????????????????? : *
 ??????????????????????? info3: struct spoolss_AddDriverInfo3
 ??????????????????????????? version????????????????? : 
SPOOLSS_DRIVER_VERSION_200X (3)
 ??????????????????????????? driver_name????????????? : *
 ??????????????????????????????? driver_name????????????? : 'hp9050-1'
 ??????????????????????????? architecture???????????? : *
 ??????????????????????????????? architecture???????????? : 'Windows NT
x86'
 ??????????????????????????? driver_path????????????? : *
 ??????????????????????????????? driver_path????????????? : 
'\\RM-SAMBA01\print$\W32X86\3\pscript5.dll'
 ??????????????????????????? data_file??????????????? : *
 ??????????????????????????????? data_file??????????????? : 
'\\RM-SAMBA01\print$\W32X86\3\hp9050-1.ppd'
 ??????????????????????????? config_file????????????? : *
 ??????????????????????????????? config_file????????????? : 
'\\RM-SAMBA01\print$\W32X86\3\ps5ui.dll'
 ??????????????????????????? help_file??????????????? : *
 ??????????????????????????????? help_file??????????????? : 
'\\RM-SAMBA01\print$\W32X86\3\pscript.hlp'
 ??????????????????????????? monitor_name???????????? : *
 ??????????????????????????????? monitor_name???????????? : 'JBV'
 ??????????????????????????? default_datatype???????? : *
 ??????????????????????????????? default_datatype???????? : ''
Bus error (core dumped)

Oct 27 15:22:26 rmc-printserver01 kernel: net[104782]: segfault at 
ffffffff0006001c ip 00007feb997dc96a sp 00007ffd9c982cd0 error 5 in 
libndr-standard.so.0.0.1[7feb99776000+31f000]


an enumdrivers 3 on the source system shows

[Windows NT x86]
Printer Driver Info 3:
 ??????? Version: [3]
 ??????? Driver Name: [hp9050-1]
 ??????? Architecture: [Windows NT x86]
 ??????? Driver Path: [\\RM-SAMBA01\print$\W32X86\3\pscript5.dll]
 ??????? Datafile: [\\RM-SAMBA01\print$\W32X86\3\hp9050-1.ppd]
 ??????? Configfile: [\\RM-SAMBA01\print$\W32X86\3\ps5ui.dll]
 ??????? Helpfile: [\\RM-SAMBA01\print$\W32X86\3\pscript.hlp]
 ??????? Dependentfiles: [\\RM-SAMBA01\print$\W32X86\3\pscript5.dll]
 ??????? Dependentfiles: [\\RM-SAMBA01\print$\W32X86\3\hp9050-1.ppd]
 ??????? Dependentfiles: [\\RM-SAMBA01\print$\W32X86\3\ps5ui.dll]
 ??????? Dependentfiles: [\\RM-SAMBA01\print$\W32X86\3\pscript.hlp]
 ??????? Dependentfiles: [\\RM-SAMBA01\print$\W32X86\3\pscript.ntf]
 ??????? Dependentfiles: [\\RM-SAMBA01\print$\W32X86\3\cups6.ini]
 ??????? Dependentfiles: [\\RM-SAMBA01\print$\W32X86\3\cupsps6.dll]
 ??????? Dependentfiles: [\\RM-SAMBA01\print$\W32X86\3\cupsui6.dll]
 ??????? Monitorname: []
 ??????? Defaultdatatype: [RAW]


It there somthing wrong with the monitor_name?

I have tried the command with a different system/driver (both 
samba-4.11) and? I run into a similar problem


 ?????????????????? info3??????????????????? : *
 ??????????????????????? info3: struct spoolss_AddDriverInfo3
 ??????????????????????????? version????????????????? : 
SPOOLSS_DRIVER_VERSION_200X (3)
 ??????????????????????????? driver_name????????????? : *
 ??????????????????????????????? driver_name????????????? : 'Dell 
C3765dnf Color MFP PCL6'
 ??????????????????????????? architecture???????????? : *
 ??????????????????????????????? architecture???????????? : 'Windows
x64'
 ??????????????????????????? driver_path????????????? : *
 ??????????????????????????????? driver_path????????????? : 
'\\SERV01\print$\x64\3\dlxcmzim.dll'
 ??????????????????????????? data_file??????????????? : *
 ??????????????????????????????? data_file??????????????? : 
'\\SERV01\print$\x64\3\dlxcmzk.ddd'
 ??????????????????????????? config_file????????????? : *
 ??????????????????????????????? config_file????????????? : 
'\\SERV01\print$\x64\3\dlxcmziv.dll'
 ??????????????????????????? help_file??????????????? : *
 ??????????????????????????????? help_file??????????????? : 
'\\SERV01\print$\x64\3\dlxcmz.chm'
 ??????????????????????????? monitor_name???????????? : *
 ??????????????????????????????? monitor_name???????????? : '@?bU'
 ??????????????????????????? default_datatype???????? : *
 ??????????????????????????????? default_datatype???????? : ''
 ??????????????????????????? _ndr_size_dependent_files: 0x00000000 (0)
 ??????????????????????????? dependent_files????????? : NULL
convert_string_internal: Conversion error: Incomplete multibyte 
sequence(@?bU)


Can I reset the monitor_name to something? net rpc printer migrate 
drivers can deal with?

Is there a different/better way to migrate the printer drivers to an new 
system?
I tried to sync the print$ share contents, but the settings etc seems to 
be stored in a registry file.
And the old server has additional smb shares, which should not be migrated.

Therefore I did not sync the whole /var/lib/samba directory with all tdb 
files

Regards

Hansj?rg



-- 
Dr. Hansj?rg Maurer
itsystems Deutschland AG
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On Wed, Oct 28, 2020 at 07:06:04AM +0100, Dr. Hansj?rg Maurer via samba
wrote:
> Hi
> 
> I am trying to migrate an old printserver from one samba4 (4.8.11 on
> CentOS-6) server to a newer one (4.11.2 on CentOS-8)
> using
> 
> net rpc printer migrate all
> 
> The migration of queue, forms, securitty, settings works, during the
> migration of the drivers (net rpc printer migrate drivers)? the command
> dumps core at the first driver
Can you run this under gdb and post the backtrace please ?

That would really help finding where we need to catch
the bad utf8 conversion error.

Thanks !