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fix: Provide macos-specific backtrace printing to avoid terminal death #17869

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Merged
ggerganov merged 2 commits into from
Dec 9, 2025
Merged

fix: Provide macos-specific backtrace printing to avoid terminal death #17869

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aa25b42
fix: Provide macos-specific backtrace printing to avoid terminal death
gabe-l-hart Dec 8, 2025
87297bd
fix: Add GGML_BACKTRACE_LLDB env var to enable using lldb for backtrace
gabe-l-hart Dec 9, 2025
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21 changes: 21 additions & 0 deletions ggml/src/ggml.c
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Original file line number Diff line number Diff line change
Expand Up @@ -124,6 +124,13 @@ static void ggml_print_backtrace_symbols(void) {
int nptrs = backtrace(trace, sizeof(trace)/sizeof(trace[0]));
backtrace_symbols_fd(trace, nptrs, STDERR_FILENO);
}
#elif defined(__APPLE__)
#include <execinfo.h>
static void ggml_print_backtrace_symbols(void) {
void * trace[100];
int nptrs = backtrace(trace, sizeof(trace)/sizeof(trace[0]));
backtrace_symbols_fd(trace, nptrs, STDERR_FILENO);
}
#else
static void ggml_print_backtrace_symbols(void) {
// platform not supported
Expand All @@ -135,6 +142,20 @@ void ggml_print_backtrace(void) {
if (GGML_NO_BACKTRACE) {
return;
}
#if defined(__APPLE__)
// On macOS, fork+debugger attachment is problematic due to:
// 1. libdispatch "poisons" forked child processes
// 2. lldb has issues attaching to parent from forked child
// Use simple backtrace() instead to avoid Terminal.app crashes
const char * GGML_BACKTRACE_LLDB = getenv("GGML_BACKTRACE_LLDB");
if (!GGML_BACKTRACE_LLDB) {
fprintf(stderr, "WARNING: Using native backtrace. Set GGML_BACKTRACE_LLDB for more info.\n");
fprintf(stderr, "WARNING: GGML_BACKTRACE_LLDB may cause native MacOS Terminal.app to crash.\n");
fprintf(stderr, "See: https://github.com/ggml-org/llama.cpp/pull/17869\n");
ggml_print_backtrace_symbols();
return;
}
#endif
#if defined(__linux__)
FILE * f = fopen("/proc/self/status", "r");
size_t size = 0;
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