lkml.org 
[lkml]   [2018]   [Apr]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: INFO: rcu detected stall in io_playback_transfer
From
Date
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;
}
----------------------------------------

\
 
 \ /
  Last update: 2018-04-08 15:01    [W:0.037 / U:0.396 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site