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// RUN: %clangxx_tsan -O1 %s -o %t
// `handle_sigbus=0` is required because when the rdar://problem/58789439 bug was
// present TSan's runtime could derefence bad memory leading to SIGBUS being raised.
// If the signal was caught TSan would deadlock because it would try to run the
// symbolizer again.
// RUN: %env_tsan_opts=handle_sigbus=0,symbolize=1 %run %t 2>&1 | FileCheck %s
// RUN: %env_tsan_opts=handle_sigbus=0,symbolize=1 __check_mach_ports_lookup=some_value %run %t 2>&1 | FileCheck %s
#include <sanitizer/common_interface_defs.h>
#include <stdio.h>
#include <stdlib.h>
const char *kEnvName = "__UNLIKELY_ENV_VAR_NAME__";
int main() {
if (getenv(kEnvName)) {
fprintf(stderr, "Env var %s should not be set\n", kEnvName);
abort();
}
// This will set an environment variable that isn't already in
// the environment array. This will cause Darwin's Libc to
// malloc() a new array.
if (setenv(kEnvName, "some_value", /*overwrite=*/1)) {
fprintf(stderr, "Failed to set %s \n", kEnvName);
abort();
}
// rdar://problem/58789439
// Now trigger symbolization. If symbolization tries to call
// to `setenv` that adds a new environment variable, then Darwin
// Libc will call `realloc()` and TSan's runtime will hit
// an assertion failure because TSan's runtime uses a different
// allocator during symbolization which leads to `realloc()` being
// called on a pointer that the allocator didn't allocate.
//
// CHECK: #{{[0-9]}} main {{.*}}no_call_setenv_in_symbolize.cpp:[[@LINE+1]]
__sanitizer_print_stack_trace();
// CHECK: DONE
fprintf(stderr, "DONE\n");
return 0;
}
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