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https://github.com/RGBCube/serenity
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76c20642f0
This fixes a null RefPtr deref (which asserts) in the scheduler if a file descriptor being select()'ed is closed by a second thread while blocked in select(). Test: Kernel/null-deref-close-during-select.cpp
36 lines
687 B
C++
36 lines
687 B
C++
#include <pthread.h>
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#include <stdio.h>
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#include <sys/select.h>
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#include <unistd.h>
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int pipefds[2];
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int main(int, char**)
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{
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pipe(pipefds);
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pthread_t tid;
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pthread_create(
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&tid, nullptr, [](void*) -> void* {
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sleep(1);
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printf("ST: close()\n");
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close(pipefds[1]);
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pthread_exit(nullptr);
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return nullptr;
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},
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nullptr);
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fd_set rfds;
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FD_ZERO(&rfds);
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FD_SET(pipefds[1], &rfds);
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printf("MT: select()\n");
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int rc = select(pipefds[1] + 1, &rfds, nullptr, nullptr, nullptr);
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if (rc < 0) {
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perror("select");
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return 1;
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}
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printf("ok\n");
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return 0;
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}
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