Re: unkillable process ?

5 Apr 2003

      Here are some more info I found in the cdrdao manual:
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BUGS
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If  the  program is terminated during the write/simulation

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process used  IPC  resources  may  not  be  released.  Use

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ipcs(8) and ipcrm(8) to delete them.
It seems that ipcs and ipcrm are not available in Mac OS X.

Any suggestions?

Thanks,

Pejvan

Pejvan BEIGUI wrote:
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jmagee@apple.com wrote:
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On Thursday, April 3, 2003, at 12:12PM, Pejvan BEIGUI wrote:
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I've got a real and weird problem, which seems to come from the
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kernel, and hence I haven't been able to find the answer anywhere
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else, i'm asking it here:
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How can anyone explain this:
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[2:10:22pm] _pejvan_ ~ >> kill -9 1026
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[2:21:32pm] _pejvan_ ~ >> kill -9 1026
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[2:21:33pm] _pejvan_ ~ >> kill -9 1026
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[2:21:33pm] _pejvan_ ~ >> kill -9 1026
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[2:21:34pm] _pejvan_ ~ >> sudo kill -9 1026
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Password:
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[2:21:42pm] _pejvan_ ~ >> sudo kill -9 1026
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[2:21:44pm] _pejvan_ ~ >> sudo kill -9 1026
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[2:21:45pm] _pejvan_ ~ >> ps -U pejvan | grep 1026
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1026  ??  Us     0:00.02 /Users/pejvan/devel/[...]
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That "U" means that the process (or more appropriately, one of the
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threads in the process) is blocked in the kernel in an
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"uninterruptible" state.  It is unacceptable for the kernel/drivers to
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so mark a thread and then non make forward progress on it.  Do you
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have any non-standard kernel extensions?  What system call was thread
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making when it got into this state?  You can find the latter by
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running the sample tool on the process (or attaching with gdb).
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In fact, this error doesn't come from my sources, it comes sometimes
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when I use cdrdao. I only have one non-standard kernel extension: the
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MSMouse kext.
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I'll try to run the sample tool on it next time i get this crash, and
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I'll report it to you. "Hopefully" this week-end.
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I really need to be able to kill this process, since it totally
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blocks the launching of any graphical app when it crashes, and
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there's no way for me to restart the computer in clean way:
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$ sudo shutdown now
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will fail and after two or three minutes, I get in the text mode
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output, with a message telling me that there have been some IPC
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failure, which leads me to the question:
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does the process crash and blocks some stuff? (which is totally wrong
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on a preemptive OS)
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does the IPC mechanism fail somewhere and make this process crash?
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(which is weirder)
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What you asked for [with that shutdown command] was not to reboot the
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machine, but instead to bring it back down to single-user-mode.  Two
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things of note about that:
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1. the un-interruptible process will still be blocked, more than
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likely, unless the shutdown killed off the facility that it was
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blocked waiting on (not likely).
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2. Mac OS X/Darwin does not like being brought down to single-user
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mode after it was already running in multi-user-mode.  Many of the key
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system services are implemented in user space.  Bringing the system
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down to single-user-mode killed those off.  The IPC messages you see
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are because you killed off the mach_init process that manages the
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namespace of public mach ports.  But you also killed off the dynamic
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pager, which manages your swap files, and it doesn't like to get
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restarted either.
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You probably wanted "shutdown -r now" where the "-r" is to force a
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reboot.
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well, after being unsuccessfull with "sudo shutdown -r now" "sudo
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reboot" "kill -9 -1" and Apple Menu > Log Out, I tried the "sudo shutdown".
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Thanks for the info though, it's very intresting.
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I'll keep you updated anyway.
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Cheers,
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Pejvan
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