Messages in this thread | | | Subject | Re: Livelock with the shmctl04 test program from linux test project | From | Alexander Nyberg <> | Date | Thu, 28 Oct 2004 12:59:05 +0200 |
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> 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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