Messages in this thread | | | From | Dmitry Vyukov <> | Date | Sun, 8 Apr 2018 15:09:55 +0200 | Subject | Re: INFO: rcu detected stall in io_playback_transfer |
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On Sun, Apr 8, 2018 at 2:58 PM, Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> wrote: > 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; > } > ----------------------------------------
Takashi has already fixed this. See this thread: https://groups.google.com/forum/#!searchin/syzkaller-bugs/%22INFO$3A$20rcu$20detected$20stall$20in$20snd_pcm_oss_write3$20(2)%22%7Csort:date/syzkaller-bugs/D2xWV7WTRDk/sCw_gImmCAAJ
The fix commit includes tag this bug: Reported-by: syzbot+4f2016cf5185da7759dc@syzkaller.appspotmail.com But it's just that it's mentioned in the thread for another bug.
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