ORA-07445: exception encountered: core dump [skgfr_reap64()+235] [SIGSEGV] [Address not mapped to object] [0x2AEE7443A188] [] []

In the database alert log there is continuous message "WARNING: Oracle process running out of OS kernel I/O resources". In the trace file you will notice following message.
WARNING:io_submit failed due to kernel limitations MAXAIO for process=128 pending aio=81
WARNING:asynch I/O kernel limits is set at AIO-MAX-NR=1048576 AIO-NR=67968
WARNING:Oracle process running out of OS kernel I/O resources

Cause of the Problem
This is Oracle bug. Oracle named this bug as Bug 6687381 or Bug 7523755. This problem only occurs on platforms where the kernel cannot dynamically allocate Async IO descriptors.

Solution of the Problem
Workaround you can disable the asynchronous IO by setting disk_asynch_io to FALSE but that is not recommended because if disk_asynch_io=FALSE, then asynchronous I/O is not enabled, which may have a detrimental effect on performance.

This bug is fixed in following versions.
- 11.1.0.7 (Server Patch Set)
- 10.2.0.5 (Server Patch Set)
- 10.2.0.4.2 (Patch Set Update)
- 10.2.0.4 Patch 26 on Windows Platforms
- 11.2g

So upgrading to your oracle database is the viable solution.