GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-120.el7
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /opt/couchbase/bin/memcached...Reading symbols from /usr/lib/debug/opt/couchbase/bin/memcached.debug...done.
done.
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To enable execution of this file add
	add-auto-load-safe-path /usr/lib64/libthread_db-1.0.so
line to your configuration file "/root/.gdbinit".
To completely disable this security protection add
	set auto-load safe-path /
line to your configuration file "/root/.gdbinit".
For more information about this security protection see the
"Auto-loading safe path" section in the GDB manual.  E.g., run from the shell:
	info "(gdb)Auto-loading safe path"
Core was generated by `/opt/couchbase/bin/memcached -C /opt/couchbase/var/lib/couchbase/config/memcach'.
#0  __atomic_add (__val=1, __mem=0x235ca) at /opt/gcc-10.2.0/include/c++/10.2.0/ext/atomicity.h:96

Thread 59 (LWP 99459):
#0  0x00007fb3560b6fc3 in pread64 () at ../sysdeps/unix/syscall-template.S:81
#1  0x000000000097f6c8 in magma::BasicFile::Read(long, unsigned long, char*, unsigned long*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/file/file_impl_linux.cc:145
#2  0x00000000009de96a in magma::FileWithStats::Read(long, unsigned long, char*, unsigned long*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/file/file_impl_stats.cc:39
#3  0x0000000000983956 in magma::BufferedFileReader::Read(magma::File*, long, unsigned long, magma::Slice&, unsigned long&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/rw_file.cc:273
#4  0x000000000098eb74 in magma::ReadAndTransform(magma::File*, long, unsigned long, std::function<magma::Status (char const*, unsigned long, std::unique_ptr<char [], std::default_delete<char []> >&, unsigned long&)>, std::unique_ptr<char [], std::default_delete<char []> >&, unsigned long&, unsigned long&, magma::BufferedFileReader*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/magma/util/block_cache.cc:39
No core file now.