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How To Enable Crash Dumps In Windows and Linux for Serv-U

How to enable crash dump in both Windows and Linux.

First published date

5/1/2020 6:39 PM

Last published date

3/19/2025 3:27 PM

Overview

This article demonstrates steps on how to collect crash dumps for an application running on Widows or Linux.

Product section

Serv-U Managed File Transfer & Serv-U FTP Server

Cause

The Serv-U application keeps on crashing for unknown issues.

Resolution

Enabling crash-dumps in Windows:

1. Run the regedit.msc.
    
2. Create a backup of WER keys.

  • Computer HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Windows Error Reporting\LocalDumps
  • Right-click on ComputerHKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Windows Error Reporting\LocalDumps choose "Export"
  • Select the destination of the backup file
  • Press OK

    
3. Create new keys, right-click the LocalDumps > New  > Key  > Type Serv-U.exe.

4. Add the new values:

Right-click Serv-U.exe and create the following.

Name: DumpFolder
Type: REG_EXPAND_SZ
Data: full-path-to-dump-folder(e.g D:\CrashDumps)

Name: DumpCount
Type: REG_DWORD
Data: 10

Name: DumpType
Type: REG_DWORD
Data: 1

5. Reboot the server.

A new key will be added to the registry; it is needed to reproduce the crash.

  • The output file will be saved to the path specified in <full-path-to-dump-folder> above.  Be sure to create this folder before attempting to reproduce the issue
  • When the issue is reproduced, a file with the application name and the .dmp extension has to be generated by windows.
  •  If there's no .dmp file in the folder - please carefully revise LocalDumps key values in the registry and repeat the process to reproduce the issue.

    
More info:
https://msdn.microsoft.com/ru-ru/library/windows/desktop/bb787181(v=vs.85).aspx 


http://www.thewindowsclub.com/activate-windows-error-reporting-windows-8 


Enabling crash-dumps in Linux:

1) edit  sysctl.conf
    # vi /etc/sysctl.conf
    kernel.core_uses_pid = 1
    kernel.core_pattern = /home/adminuser/Desktop/dump/core-%e-%s-%u-%g-%p-%t
    fs.suid_dumpable = 2
   Where  /home/adminuser/Desktop/dump =  folder for storing the dumps. Must be available for user

2) Reload settings with:
    # sysctl -p

3) Set limits for core files dumps
    ulimit -c unlimited

4) Edit /etc/systemd/system.conf (sudo required)
    Uncomment and set
    DefaultLimitCORE=infinity

5) Reboot the server

More info:
https://www.cyberciti.biz/tips/linux-core-dumps.html