diff options
Diffstat (limited to 'test/asan/TestCases/Linux/signal_during_stop_the_world.cc')
-rw-r--r-- | test/asan/TestCases/Linux/signal_during_stop_the_world.cc | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/test/asan/TestCases/Linux/signal_during_stop_the_world.cc b/test/asan/TestCases/Linux/signal_during_stop_the_world.cc new file mode 100644 index 000000000000..b1a41fe20c05 --- /dev/null +++ b/test/asan/TestCases/Linux/signal_during_stop_the_world.cc @@ -0,0 +1,60 @@ +// Test StopTheWorld behavior during signal storm. +// Historically StopTheWorld crashed because did not handle EINTR properly. +// The test is somewhat convoluted, but that's what caused crashes previously. + +// RUN: %clangxx_asan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s + +#include <stdio.h> +#include <stdlib.h> +#include <signal.h> +#include <unistd.h> +#include <sys/types.h> +#include <sys/prctl.h> +#include <sys/wait.h> +#include <time.h> +#include <pthread.h> +#include <sanitizer/lsan_interface.h> + +static void handler(int signo); +static void *thr(void *arg); + +int main() { + struct sigaction act = {}; + act.sa_handler = handler; + sigaction(SIGPROF, &act, 0); + + pid_t pid = fork(); + if (pid < 0) { + fprintf(stderr, "failed to fork\n"); + exit(1); + } + if (pid == 0) { + // Child constantly sends signals to parent to cause spurious return from + // waitpid in StopTheWorld. + prctl(PR_SET_PDEATHSIG, SIGTERM, 0, 0, 0); + pid_t parent = getppid(); + for (;;) { + // There is no strong reason for these two particular signals, + // but at least one of them ought to unblock waitpid. + kill(parent, SIGCHLD); + kill(parent, SIGPROF); + } + } + usleep(10000); // Let the child start. + __lsan_do_leak_check(); + // Kill and join the child. + kill(pid, SIGTERM); + waitpid(pid, 0, 0); + sleep(1); // If the tracer thread still runs, give it time to crash. + fprintf(stderr, "DONE\n"); +// CHECK: DONE +} + +static void handler(int signo) { +} + +static void *thr(void *arg) { + for (;;) + sleep(1); + return 0; +} |