523cc097fd
HwasanThreadList::DontNeedThread clobbers Thread::next_, Breaking the freelist. As a result, only the top of the freelist ever gets reused, and the rest of it is lost. Since the Thread object with its associated ring buffer is only 8Kb, this is typically only noticable in long running processes, such as fuzzers. Fix the problem by switching from an intrusive linked list to a vector. Differential Revision: https://reviews.llvm.org/D91392
56 lines
1.3 KiB
C++
56 lines
1.3 KiB
C++
// Test that Thread objects are reused.
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// RUN: %clangxx_hwasan -mllvm -hwasan-instrument-stack=0 %s -o %t && %env_hwasan_opts=verbose_threads=1 %run %t 2>&1 | FileCheck %s
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#include <assert.h>
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#include <fcntl.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sanitizer/hwasan_interface.h>
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#include "../utils.h"
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pthread_barrier_t bar;
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void *threadfn(void *) {
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pthread_barrier_wait(UNTAG(&bar));
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return nullptr;
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}
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void start_stop_threads() {
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constexpr int N = 2;
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pthread_t threads[N];
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pthread_barrier_init(UNTAG(&bar), nullptr, N + 1);
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for (auto &t : threads)
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pthread_create(&t, nullptr, threadfn, nullptr);
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pthread_barrier_wait(UNTAG(&bar));
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for (auto &t : threads)
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pthread_join(t, nullptr);
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pthread_barrier_destroy(UNTAG(&bar));
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}
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int main() {
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// Cut off initial threads.
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// CHECK: === test start ===
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untag_fprintf(stderr, "=== test start ===\n");
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// CHECK: Creating : T{{[0-9]+}} [[A:0x[0-9a-f]+]] stack:
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// CHECK: Creating : T{{[0-9]+}} [[B:0x[0-9a-f]+]] stack:
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start_stop_threads();
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// CHECK-DAG: Creating : T{{[0-9]+}} [[A]] stack:
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// CHECK-DAG: Creating : T{{[0-9]+}} [[B]] stack:
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start_stop_threads();
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// CHECK-DAG: Creating : T{{[0-9]+}} [[A]] stack:
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// CHECK-DAG: Creating : T{{[0-9]+}} [[B]] stack:
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start_stop_threads();
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return 0;
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}
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