Re: unkillable process ?

6 Apr 2003

      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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Here's what sampler can tell me about the process. Hope it can give you

valuable information. Please let me know if you think that I should fill

in a bug report.

Thanks,

Pejvan
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Report #0 - Sampling cdrdao (process 1054)
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Stacks at 2003-04-06 13:23:05 +0200
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Samples (displayed/total): 1697/1697
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Call graph:
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1697 Thread_5607

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1697 start

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1697 _start

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1697 main

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1697 setupDevice(Command, char const*, char const*, int, int, int, int, int)

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1697 ScsiIf::init()

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1697 scg_open

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1697 scg__open

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1697 scgo_open

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1697 SCSITaskDeviceClass::ObtainExclusiveAccess()

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1697 IOConnectMethodScalarIScalarO

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1697 io_connect_method_scalarI_scalarO

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1697 mach_msg

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1697 mach_msg_trap

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1697 mach_msg_trap [STACK TOP]

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Total number in stack (recursive counted multiple, when >=5):
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Sort by top of stack, same collapsed (when >= 5):
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mach_msg_trap [STACK TOP]        1697
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