Core dump collects only process space but not the shared memory which is created for Inter-process communication. How can I make core dump to include shared memory of running process too?
Set the core file filter in /proc/PID/coredump_filter per http://man7.org/linux/man-pages/man5/core.5.html:
Controlling which mappings are written to the core dump
Since kernel 2.6.23, the Linux-specific /proc/PID/coredump_filter
file can be used to control which memory segments are written to the
core dump file in the event that a core dump is performed for the
process with the corresponding process ID.
The value in the file is a bit mask of memory mapping types (see
mmap(2)). If a bit is set in the mask, then memory mappings of the
corresponding type are dumped; otherwise they are not dumped. The
bits in this file have the following meanings:
bit 0 Dump anonymous private mappings.
bit 1 Dump anonymous shared mappings.
bit 2 Dump file-backed private mappings.
bit 3 Dump file-backed shared mappings.
bit 4 (since Linux 2.6.24)
Dump ELF headers.
bit 5 (since Linux 2.6.28)
Dump private huge pages.
bit 6 (since Linux 2.6.28)
Dump shared huge pages.
bit 7 (since Linux 4.4)
Dump private DAX pages.
bit 8 (since Linux 4.4)
Dump shared DAX pages.
By default, the following bits are set: 0, 1, 4 (if the
CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS kernel configuration option is
enabled), and 5. This default can be modified at boot time using the
coredump_filter boot option.
The core file captures the complete process address space including the shared memory. You can check by generating the core file using gcore command on Linux and then checking specific contents you have stored in shared memory in the core file.