I manually simplified the reproducer.
It is quite strange that removing unshare() hides this lockup bug.
Also, explicitly closing by "close()" hides this lockup bug.
Triggering "fput() from do_exit()" from "different namespace"
somehow affects this lockup bug?
----------------------------------------
#define _GNU_SOURCE
#include <fcntl.h>
#include <sched.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/soundcard.h>
int main(int argc, char *argv[])
{
const int fd = open("/dev/dsp1", O_RDWR);
int frag = (0 << 16) | 0;
char buf[48] = { };
unshare(CLONE_NEWNS);
ioctl(fd, SNDCTL_DSP_SETFRAGMENT, &frag);
write(fd, buf, sizeof(buf));
return 0;
}
----------------------------------------
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