(cherry picked from commit 292144f)

…290)

* Fix use-after-free in CallTraceStorage and optimize trace collection

The original issue was a use-after-free bug in CallTraceStorage::processTraces()
where trace pointers were accessed after the memory was deallocated during
triple-buffer rotation.

Key changes:
- Fixed use-after-free by copying preserved traces immediately using putWithExistingId()
- Added optional hook parameter to CallTraceHashTable::collect() for inline processing
- Eliminated separate trace buffers (_standby_traces_buffer, _active_traces_buffer)
- Simplified processTraces() to collect directly to _traces_buffer with hooks
- Removed double iteration pattern (collect then iterate) in favor of single pass
- Added regression test to catch use-after-free with frame content access

The fix ensures memory safety while improving performance by eliminating
unnecessary buffer copying and reducing iteration overhead.

Co-Authored-By: Claude <[email protected]>
(cherry picked from commit 91fc9ec)

…lers (#293)

* Avoid potential deadlocks from using std::* operations in signal handlers

* Avoid intermittent failures in traceid generation tests

* Mark fields with concurrent access as volatile

(cherry picked from commit 8070f3c)

…rder

(cherry picked from commit af11ba0)

… index (#296)

(cherry picked from commit dcfc396)

(cherry picked from commit 5ec6f6a)

(cherry picked from commit e800295)

Backport critical fixes to 1.34.4