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SubjectRe: Livelock with the shmctl04 test program from linux test project
From
Date
> Hi Alexander,
>
> >I'm seeing some sort of livelock on my dual amd64 with the shmctl04 test program
> >
> What do you mean with "sort of livelock"? Does it recover after a few
> minutes, does it recover if you send a signal to the shmctl04 test app?
> What is the contents of /proc/sysvipc/shm while xfce4 is running/not
> running?

Sorry for late reply, but I just can't understand why & how this happens, been trying to grasp
the IPC/SHM part but I'm missing something. One processor gets locked up and never released.
I did:

printk("taking lock\n");
spin_lock(&info->lock);
printk("lock taken\n");

and it never prints out "lock taken" so i know where it locks up. Now the fun part,
spinlock debugging doesn't catch it, but I did a simple patch to show who is holding a lock
at the current time, and it appears noone has taken the lock. I really don't get this.


With xfce4 running:
key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime
0 32768 1600 393216 629 608 2 1000 1000 1000 1000 1098960009 0 1098960009
0 65537 1600 196608 644 608 2 1000 1000 1000 1000 1098960009 0 1098960009
0 98306 1600 393216 646 668 2 1000 1000 1000 1000 1098960014 1098960014 1098960009
0 131075 1600 393216 648 608 2 1000 1000 1000 1000 1098960021 0 1098960021
0 163844 1600 393216 666 700 2 1000 1000 1000 1000 1098960029 1098960029 1098960023
0 196613 1600 196608 666 700 2 1000 1000 1000 1000 1098960029 1098960029 1098960023
0 229382 1600 393216 643 608 2 1000 1000 1000 1000 1098960023 0 1098960023
0 262151 1600 393216 668 681 2 1000 1000 1000 1000 1098960025 1098960025 1098960025
0 294920 1600 196608 648 608 2 1000 1000 1000 1000 1098960026 0 1098960026
0 360457 1600 393216 706 711 2 1000 1000 1000 1000 1098960036 1098960036 1098960035
0 425994 1600 393216 715 716 2 1000 1000 1000 1000 1098960039 1098960084 1098960039
0 458763 1600 196608 715 608 2 1000 1000 1000 1000 1098960041 0 1098960041
0 491532 1600 393216 642 608 2 1000 1000 1000 1000 1098960059 0 1098960059


Console only:
key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime


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