https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240989
Bug ID: 240989
Summary: Linuxulator: futexes can't be shared between 32- and
64-bit applications
Product: Base System
Version: 12.0-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Here's a small example:
#define _GNU_SOURCE
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <linux/futex.h>
#define SHM_FILE_PATH "/futex-bug"
int main() {
int fd = shm_open(SHM_FILE_PATH, O_CREAT | O_RDWR, 0777);
assert(fd != -1);
ftruncate(fd, 4);
int* addr = mmap(NULL, 4, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
assert(addr != MAP_FAILED);
close(fd);
#ifdef WAIT
struct timespec timeout = {.tv_sec = 1, .tv_nsec = 0};
int err = -1;
do {
err = syscall(SYS_futex, addr, FUTEX_WAIT, 0, &timeout, NULL, 0);
if (err == -1) {
printf("FUTEX_WAIT: %d [%s]\n", err, strerror(errno));
} else {
printf("FUTEX_WAIT: %d\n", err);
}
} while (err == -1 && errno == ETIMEDOUT);
shm_unlink(SHM_FILE_PATH);
#else
int err = syscall(SYS_futex, addr, FUTEX_WAKE, 1, NULL, NULL, 0);
printf("FUTEX_WAKE: %d\n", err);
#endif
return 0;
}
Compile this with:
/compat/linux/bin/cc -DWAIT -m32 --sysroot=/compat/linux futex_bug.c -lrt -o
wait32
/compat/linux/bin/cc -m32 --sysroot=/compat/linux futex_bug.c -lrt -o
wake32
/compat/linux/bin/cc -m64 --sysroot=/compat/linux futex_bug.c -lrt -o
wake64
Run wait32, then try wake64 and wake32.
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