f831d6fc80
FdClose is a subjet to the same atomicity problem as MemoryRangeFreed (memory state is not "monotoic" wrt race detection). So we need to lock the thread slot in FdClose the same way we do in MemoryRangeFreed. This fixes the modified stress.cpp test. Reviewed By: vitalybuka, melver Differential Revision: https://reviews.llvm.org/D121143
103 lines
2.8 KiB
C++
103 lines
2.8 KiB
C++
// This run stresses global reset happenning concurrently with everything else.
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// RUN: %clangxx_tsan -O1 %s -o %t && %env_tsan_opts=flush_memory_ms=1:flush_symbolizer_ms=1:memory_limit_mb=1 %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-NORACE
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// This run stresses race reporting happenning concurrently with everything else.
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// RUN: %clangxx_tsan -O1 %s -DRACE=1 -o %t && %env_tsan_opts=suppress_equal_stacks=0:suppress_equal_addresses=0 %deflake %run %t | FileCheck %s --check-prefix=CHECK-RACE
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#include "test.h"
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#include <fcntl.h>
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#include <string.h>
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volatile long stop;
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long atomic, read_only, racy;
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int fds[2];
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__attribute__((noinline)) void *SecondaryThread(void *x) {
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__atomic_fetch_add(&atomic, 1, __ATOMIC_ACQ_REL);
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return NULL;
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}
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void *Thread(void *x) {
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const int me = (long)x;
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volatile long sink = 0;
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int fd = -1;
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while (!stop) {
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// If me == 0, we do all of the following,
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// otherwise only 1 type of action.
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if (me == 0 || me == 1) {
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// just read the stop variable
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}
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if (me == 0 || me == 2) {
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__atomic_store_n(&atomic, sink, __ATOMIC_RELEASE);
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}
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if (me == 0 || me == 3) {
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sink += __atomic_fetch_add(&atomic, 1, __ATOMIC_ACQ_REL);
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}
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if (me == 0 || me == 4) {
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SecondaryThread(NULL);
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}
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if (me == 0 || me == 5) {
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write(fds[1], fds, 1);
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}
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if (me == 0 || me == 6) {
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char buf[2];
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read(fds[0], &buf, sizeof(buf));
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}
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if (me == 0 || me == 7) {
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pthread_t th;
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pthread_create(&th, NULL, SecondaryThread, NULL);
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pthread_join(th, NULL);
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}
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if (me == 0 || me == 8) {
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long buf;
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memcpy(&buf, &read_only, sizeof(buf));
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sink += buf;
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}
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if (me == 0 || me == 9) {
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#if RACE
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sink += racy++;
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#else
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sink += racy;
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#endif
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}
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if (me == 0 || me == 10) {
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fd = open("/dev/null", O_RDONLY);
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if (fd != -1) {
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close(fd);
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fd = -1;
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}
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}
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// If you add more actions, update kActions in main.
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}
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return NULL;
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}
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int main() {
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ANNOTATE_BENIGN_RACE(stop);
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if (pipe(fds))
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exit((perror("pipe"), 1));
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if (fcntl(fds[0], F_SETFL, O_NONBLOCK))
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exit((perror("fcntl"), 1));
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if (fcntl(fds[1], F_SETFL, O_NONBLOCK))
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exit((perror("fcntl"), 1));
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const int kActions = 11;
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#if RACE
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const int kMultiplier = 1;
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#else
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const int kMultiplier = 4;
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#endif
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pthread_t t[kActions * kMultiplier];
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for (int i = 0; i < kActions * kMultiplier; i++)
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pthread_create(&t[i], NULL, Thread, (void *)(long)(i % kActions));
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sleep(5);
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stop = 1;
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for (int i = 0; i < kActions * kMultiplier; i++)
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pthread_join(t[i], NULL);
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fprintf(stderr, "DONE\n");
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return 0;
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}
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// CHECK-NORACE-NOT: ThreadSanitizer:
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// CHECK-NORACE: DONE
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// CHECK-NORACE-NOT: ThreadSanitizer:
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// CHECK-RACE: ThreadSanitizer: data race
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// CHECK-RACE: DONE
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