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Dead scanner blocks the spool queue

Johnny Long

We have been encountering this issue consistently over the past three years. Whenever we receive emails with large scanned PDF files, it causes a blockage in the spool work queue. As a result, the CPU usage spikes to 100%. Upon inspection of the files in the /chroot-smtp/spool/work directory, we often find "dead_scanner" files present. In some cases, the entire queue stops processing, resulting in a backlog of thousands of emails and a complete halt of inbound and outbound email functionality.

We have attempted various solutions, including adjusting the scanner_timeout to 30 and 60, as well as experimenting with different values for max_pool ranging from 5 to 10. However, none of these attempts have successfully resolved the issue.

Did anyone else here encounter a similar issue or have insights on how to address this problem? We have typically resorted to manually removing the "dead_scanner" file and its related files, followed by a server restart to resume queue processing. Any suggestions or assistance would be greatly appreciated in resolving this recurring issue.



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  • 0 in reply to Johnny Long

      You can read the atop file:

    Reading and searching through atop log file

    Run this command to read the recorded file:

    atop -r /home/login/atop-log 

    Atop has numerous filtering options available, but a brief summary of the most common ones can be found below:

    • t - Skips forwards in time to next snapshot
    • T - When viewing the contents of a raw file, this key can be used to show the previous sample from the file.
    • P - Enter search string - http / postgres etc....
    • b - [Enter time] - When viewing the contents of a raw file, this key can be used to jump to a certain timestamp within the file (either forward or backward).
    • r - skip back to the start of the file with the current filter applied

    Thanks & Regards,
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    Vivek Jagad | Team Lead, Global Support & Services 

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