Print backtrace when panic happens

Backtrace is printed on the debug level

crates/telio-utils/Cargo.toml

@@ -10,6 +10,7 @@ publish = false
 sn_fake_clock = ["dep:sn_fake_clock"]
 
 [dependencies]
+backtrace = "0.3.74"
 blake3 = "1.5.4"
 futures.workspace = true
 hashlink.workspace = true

crates/telio-utils/src/backtrace.rs

@@ -0,0 +1,31 @@
+use crate::telio_log_debug;
+use backtrace;
+
+/// Print to debug log current backtrace
+pub fn log_current_backtrace() {
+    let mut counter = 0;
+    backtrace::trace(|frame| {
+        let ip = frame.ip();
+        let symbol_address = frame.symbol_address();
+
+        // Resolve this instruction pointer to a symbol name
+        backtrace::resolve_frame(frame, |symbol| {
+            let name = symbol
+                .name()
+                .map(|symbol| symbol.to_string())
+                .unwrap_or_else(|| format!("{symbol_address:?}"));
+
+            let filename = symbol
+                .filename()
+                .map(|filename| filename.to_string_lossy().into_owned())
+                .unwrap_or_else(|| "uknown.file".to_owned());
+
+            let lineno = symbol.lineno().unwrap_or(0);
+
+            telio_log_debug!("backtrace: {counter:3} {ip:?} {filename}:{lineno} {name}");
+            counter += 1;
+        });
+
+        true
+    });
+}

crates/telio-utils/src/lib.rs

@@ -59,3 +59,6 @@ pub mod const_ipnet;
 
 /// Log censoring via postprocessing utilities
 pub mod log_censor;
+
+/// Utilities for working with backtraces/stacktraces/callstacks
+pub mod backtrace;

src/ffi.rs

@@ -33,7 +33,8 @@ use nat_detect::NatType;
 
 // debug tools
 use telio_utils::{
-    commit_sha, telio_log_debug, telio_log_error, telio_log_info, telio_log_warn, version_tag,
+    backtrace::log_current_backtrace, commit_sha, telio_log_debug, telio_log_error, telio_log_info,
+    telio_log_warn, version_tag,
 };
 
 const DEFAULT_PANIC_MSG: &str = "libtelio panicked";
@@ -211,7 +212,9 @@ impl Telio {
             let events = panic_event_dispatcher;
             panic::set_hook(Box::new(move |info| {
                 // We need it on the logs as well ...
-                error!("{}", info);
+                telio_log_error!("{}", info);
+
+                log_current_backtrace();
 
                 let err = {
                     let message = {