[seekdb][lib] Fix lbt addr2line for non-PIE executables

[hnwyllmm]

Task Description

Fix the lbt utility's address calculation so that stack trace addresses printed in logs can be correctly resolved using addr2line when the seekdb executable is built with -no-pie (disabling Position Independent Executables).

Solution Description

Previously, lbt always subtracted the process load base address, assuming the executable was a PIE (ET_DYN type). When built with -no-pie, the executable type becomes ET_EXEC. The fix detects the executable type by reading the ELF header from /proc/self/exe during initialization. For ET_EXEC (non-PIE) executables, the raw backtrace addresses are printed without modification. For ET_DYN (PIE) executables, the load bias is still subtracted as before to produce addresses usable by addr2line.

Passed Regressions

• Rebuilt seekdb and verified lbt output addresses resolve correctly via addr2line -pCfe ./bin/seekdb <addrs> on a running process (tested with gdb).

Upgrade Compatibility

No impact.

Other Information

• Fixed branch: master
• Workaround for old builds: Manually add back the load base address when using addr2line.
• Internal reference: DIMA-2026062400116954150
• Development branch: task/2026062400116954150

Release Note

Fix: The lbt utility now correctly prints stack trace addresses for addr2line resolution when seekdb is built with the -no-pie compiler flag.

[hnwyllmm]

The mapping Dima issue is a stack address error.