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  1. MariaDB Server
  2. MDEV-10814

Feature request: Optionally exclude large buffers from core dumps

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      Description

      As the size of core dump files by default mostly equals the process size producing core dumps can become an issue on systems with memory buffers, esp. large innodb_buffer_pool_size.

      There needs to be enough file system space to store such large core dumps, and with multi gigabyte files it also takes a non-trivial amount of time to write these, so delaying process restart quite a bit.

      And then there's also a security aspect to it: as the core dump contains the complete innodb buffer pool it contains a substantial amount, or even all, of the actual user data in the database.

      At the same time actual buffer contents are rarely needed when doing a post mortem analysis (usually we only need stack frames and a few pieces of local data).

      So I'm proposing a server option to exclude certain buffers from core dumps by marking them as DONOTDUMP with the madvise() system call.

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          causes

          Bug - A problem which impairs or prevents the functions of the product. MDEV-18946 munmap of 1 byte during shutdown is EINVAL

          • Major - Major loss of function.
          • Closed
          relates to

          Task - A task that needs to be done. MDEV-17159 Document what is included in core dumps

          • Major - Major loss of function.
          • Closed

          Task - A task that needs to be done. MDEV-16605 Always include buf_madvise_do_dump in binaries.

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. MDEV-20684 innodb: use madvise CORE/NOCORE on FreeBSD for selective large allocations

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-21741 [Warning] InnoDB: Failed to set memory to MADV_DONTDUMP: Function not implemented

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

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              People

              Assignee:
              sanja Oleksandr Byelkin
              Reporter:
              hholzgra Hartmut Holzgraefe
              Votes:
              4 Vote for this issue
              Watchers:
              11 Start watching this issue

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