root@myvm:~# gdb -p 26850 GNU gdb (Ubuntu 8.1-0ubuntu3.2) 8.1.0.20180409-git Copyright (C) 2018 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: . Find the GDB manual and other documentation resources online at: . For help, type "help". Type "apropos word" to search for commands related to "word". Attaching to process 26850 Reading symbols from /usr/lib/postgresql/12/bin/postgres...(no debugging symbols found)...done. Reading symbols from /lib/x86_64-linux-gnu/libpthread.so.0...Reading symbols from /usr/lib/debug/.build-id/28/c6aade70b2d40d1f0f3d0a1a0cad1ab816448f.debug...done. done. [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Reading symbols from /usr/lib/x86_64-linux-gnu/libxml2.so.2...(no debugging symbols found)...done. Reading symbols from /lib/x86_64-linux-gnu/libpam.so.0...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libssl.so.1.1...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libgssapi_krb5.so.2...(no debugging symbols found)...done. Reading symbols from /lib/x86_64-linux-gnu/librt.so.1...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/librt-2.27.so...done. done. Reading symbols from /lib/x86_64-linux-gnu/libdl.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libdl-2.27.so...done. done. Reading symbols from /lib/x86_64-linux-gnu/libm.so.6...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libm-2.27.so...done. done. Reading symbols from /usr/lib/x86_64-linux-gnu/libldap_r-2.4.so.2...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libicui18n.so.60...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libicuuc.so.60...(no debugging symbols found)...done. Reading symbols from /lib/x86_64-linux-gnu/libsystemd.so.0...(no debugging symbols found)...done. Reading symbols from /lib/x86_64-linux-gnu/libc.so.6...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libc-2.27.so...done. done. Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/ld-2.27.so...done. done. Reading symbols from /lib/x86_64-linux-gnu/libz.so.1...(no debugging symbols found)...done. Reading symbols from /lib/x86_64-linux-gnu/liblzma.so.5...(no debugging symbols found)...done. Reading symbols from /lib/x86_64-linux-gnu/libaudit.so.1...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libkrb5.so.3...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libk5crypto.so.3...(no debugging symbols found)...done. Reading symbols from /lib/x86_64-linux-gnu/libcom_err.so.2...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libkrb5support.so.0...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/liblber-2.4.so.2...(no debugging symbols found)...done. Reading symbols from /lib/x86_64-linux-gnu/libresolv.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libresolv-2.27.so...done. done. Reading symbols from /usr/lib/x86_64-linux-gnu/libsasl2.so.2...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libgssapi.so.3...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libgnutls.so.30...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libstdc++.so.6...(no debugging symbols found)...done. Reading symbols from /lib/x86_64-linux-gnu/libgcc_s.so.1...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libicudata.so.60...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/liblz4.so.1...(no debugging symbols found)...done. Reading symbols from /lib/x86_64-linux-gnu/libgcrypt.so.20...(no debugging symbols found)...done. Reading symbols from /lib/x86_64-linux-gnu/libcap-ng.so.0...(no debugging symbols found)...done. Reading symbols from /lib/x86_64-linux-gnu/libkeyutils.so.1...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libheimntlm.so.0...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libkrb5.so.26...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libasn1.so.8...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libhcrypto.so.4...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libroken.so.18...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libp11-kit.so.0...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libidn2.so.0...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libunistring.so.2...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libtasn1.so.6...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libnettle.so.6...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libhogweed.so.4...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libgmp.so.10...(no debugging symbols found)...done. Reading symbols from /lib/x86_64-linux-gnu/libgpg-error.so.0...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libwind.so.0...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libheimbase.so.1...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libhx509.so.5...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libsqlite3.so.0...(no debugging symbols found)...done. Reading symbols from /lib/x86_64-linux-gnu/libcrypt.so.1...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libcrypt-2.27.so...done. done. Reading symbols from /usr/lib/x86_64-linux-gnu/libffi.so.6...(no debugging symbols found)...done. Reading symbols from /lib/x86_64-linux-gnu/libnss_files.so.2...Reading symbols from /usr/lib/debug//lib/x86_64-linux-gnu/libnss_files-2.27.so...done. done. Reading symbols from /usr/lib/postgresql/12/lib/postgis-3.so...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libgeos_c.so.1...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libproj.so.12...(no debugging symbols found)...done. Reading symbols from /lib/x86_64-linux-gnu/libjson-c.so.3...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libprotobuf-c.so.1...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libSFCGAL.so.1...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libgeos-3.7.1.so...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libCGAL_Core.so.13...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libboost_thread.so.1.65.1...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libboost_serialization.so.1.65.1...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libCGAL.so.13...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libgmpxx.so.4...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libmpfr.so.6...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libboost_system.so.1.65.1...(no debugging symbols found)...done. Reading symbols from /usr/lib/postgresql/12/lib/plpgsql.so...(no debugging symbols found)...done. Reading symbols from /usr/lib/postgresql/12/lib/llvmjit.so...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libLLVM-6.0.so.1...(no debugging symbols found)...done. Reading symbols from /usr/lib/x86_64-linux-gnu/libedit.so.2...(no debugging symbols found)...done. Reading symbols from /lib/x86_64-linux-gnu/libtinfo.so.5...(no debugging symbols found)...done. Reading symbols from /usr/lib/postgresql/12/lib/utf8_and_iso8859.so...(no debugging symbols found)...done. 0x00007f4d3f073b77 in epoll_wait (epfd=5, events=0x55f735ff1260, maxevents=1, timeout=-1) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30 30 ../sysdeps/unix/sysv/linux/epoll_wait.c: No such file or directory. (gdb) p MemoryContextStats(TopMemoryContext) 'TopMemoryContext' has unknown type; cast it to its declared type (gdb)