9e66e5872c
For errno spoiling reports we only print the stack where the signal handler is invoked. And the top frame is the signal handler function, which is supposed to give the info for debugging. But in same cases the top frame can be some common thunk, which does not give much info. E.g. for Go/cgo it's always runtime.cgoSigtramp. Print the signal number. This is what we can easily gather and it may give at least some hints regarding the issue. Reviewed By: melver, vitalybuka Differential Revision: https://reviews.llvm.org/D121979
53 lines
1.3 KiB
C++
53 lines
1.3 KiB
C++
// RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
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// This test fails on powerpc64 BE (VMA=44), it does not appear to be
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// a functional problem, but the Tsan report is missing some info.
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// XFAIL: powerpc64-unknown-linux-gnu
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#include "test.h"
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#include <signal.h>
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#include <sys/types.h>
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#include <errno.h>
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pthread_t mainth;
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volatile int done;
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static void MyHandler(int, siginfo_t *s, void *c) {
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errno = 1;
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done = 1;
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}
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static void* sendsignal(void *p) {
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barrier_wait(&barrier);
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pthread_kill(mainth, SIGPROF);
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return 0;
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}
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static __attribute__((noinline)) void loop() {
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barrier_wait(&barrier);
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while (done == 0) {
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volatile char *p = (char*)malloc(1);
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p[0] = 0;
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free((void*)p);
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sched_yield();
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}
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}
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int main() {
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barrier_init(&barrier, 2);
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mainth = pthread_self();
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struct sigaction act = {};
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act.sa_sigaction = &MyHandler;
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sigaction(SIGPROF, &act, 0);
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pthread_t th;
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pthread_create(&th, 0, sendsignal, 0);
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loop();
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pthread_join(th, 0);
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return 0;
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}
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// CHECK: WARNING: ThreadSanitizer: signal handler spoils errno
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// CHECK: Signal 27 handler invoked at:
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// CHECK: #0 MyHandler(int, {{(__)?}}siginfo{{(_t)?}}*, void*) {{.*}}signal_errno.cpp
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// CHECK: main
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// CHECK: SUMMARY: ThreadSanitizer: signal handler spoils errno{{.*}}MyHandler
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