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Crash log is a log file automatically created on Set top boxes when a crash occurs. This information is useful for offline debugging. 

Core Dump and Minidump

What is Coredump?

Core dump files generated after an uncaught signal in a process (as a SIGSEGV or SIGQUIT), are generated in the base directory where the program was executed, and the core dumps starts with the name  as “core” or “core.PID”.

By default size of the core will be zero, To generate the core, we need to set the size of the core to unlimited. 

• ulimit -c unlimited

By default, core will be generated in the current directory with the file name "core". We can change the core generating directory from current directory to another by editing the kernel configuration file core pattern(/proc/sys/kernel/core_pattern)  in the kernel.

• echo "newpattern" > /proc/sys/kernel/core_pattern

Core pattern is helpful in the case if there are couple of core dumps files in one directory and we don't know which program caused it.

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Minidump

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• A list of the executable and shared libraries that were loaded in the process at the time the dump was created. This list includes both file names and identifiers for the particular versions of those files that were loaded.
• A list of threads present in the process. For each thread, the minidump includes the state of the processor registers, and the contents of the threads' stack memory.
• Other information about the system on which the dump was collected: processor and operating system versions, the reason for the dump, and so on. 

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• uploadDumps.sh collects core dumps/ mini dumps  to crash server whenever any applications crashes.

 Coredump

Core dump files generated after an uncaught signal in a process (as a SIGSEGV or SIGQUIT), are generated in the base directory where the program was executed, and the core dumps starts with the name  as “core” or “core.PID”.

By default size of the core will be zero, To generate the core, we need to set the size of the core to unlimited. 

• ulimit -c unlimited

By default, core will be generated in the current directory with the file name "core". We can change the core generating directory from current directory to another by editing the kernel configuration file core pattern(/proc/sys/kernel/core_pattern)  in the kernel.

• echo "newpattern" > /proc/sys/kernel/core_pattern

Core pattern is helpful in the case if there are couple of core dumps files in one directory and we don't know which program caused it.