[eBPF] Fix memory leak when reading lost statistics from perf buffer

[yinjiping]

This PR is for:

Caused a memory leak problem in the optimization PR(#5669) submitted earlier. When the user-mode program receives data from the perf buffer, the address of the handle is fwd_info instead of tracer. In this case, an error occurs when tracer->lost is read.

Here is the memory check information:

==16372== Invalid write of size 8
==16372==    at 0xC33AF4: atomic64_add (atomic.h:138)
==16372==    by 0xC33AF4: reader_lost_cb_a (perf_profiler.c:298)
==16372==    by 0xC3ACD5: perf_reader_event_read (perf_reader.c:205)
==16372==    by 0xC34AFD: reader_event_read (perf_reader.h:76)
==16372==    by 0xC34AFD: process_bpf_stacktraces (perf_profiler.c:985)
==16372==    by 0xC34AFD: cp_reader_work (perf_profiler.c:1076)
==16372==    by 0x4C51AC2: start_thread (pthread_create.c:442)
==16372==    by 0x4CE2A03: clone (clone.S:100)
==16372==  Address 0x40970898 is 24 bytes inside a block of size 30 alloc'd
==16372==    at 0x4848899: malloc (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==16372==    by 0x65F333: alloc::raw_vec::RawVec<T,A>::allocate_in (alloc.rs:98)
==16372==    by 0x6B9A7E: <deepflow_agent::flow_generator::protocol_logs::sql::mysql::MysqlLog as deepflow_agent::common::l7_protocol_log::L7ProtocolParserInterface>::parse_payload (raw_vec.rs:145)
==16372==    by 0x9F2E6A: deepflow_agent::flow_generator::perf::FlowLog::l7_parse_log (l7_protocol_log.rs:218)
==16372==    by 0x9ED85C: deepflow_agent::flow_generator::flow_map::FlowMap::collect_metric (mod.rs:455)
==16372==    by 0x9EA3F6: deepflow_agent::flow_generator::flow_map::FlowMap::inject_meta_packet (flow_map.rs:869)
==16372==    by 0x9DFBB2: deepflow_agent::ebpf_dispatcher::ebpf_dispatcher::EbpfDispatcher::run (ebpf_dispatcher.rs:251)
==16372==    by 0x855337: std::sys_common::backtrace::__rust_begin_short_backtrace (ebpf_dispatcher.rs:736)
==16372==    by 0x8694AD: core::ops::function::FnOnce::call_once{{vtable.shim}} (mod.rs:529)
==16372==    by 0x1765694: std::sys::pal::unix::thread::Thread::new::thread_start (boxed.rs:2015)
==16372==    by 0x4C51AC2: start_thread (pthread_create.c:442)
==16372==    by 0x4CE2A03: clone (clone.S:100)

• Agent

Affected branches

• main
• v6.4