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Date: Wed, 05 Dec 2007 10:40:29 -0800
From: srp <sean_pierce AT symantec DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: 1.5.24 format.com hangs through ssh
References: <120320072211 DOT 2441 DOT 47547F1A000B21E0000009892216566276CFCECF9F9D9C AT comcast DOT net> <475484D4 DOT 50807 AT cygwin DOT com> <47548955 DOT 1030703 AT symantec DOT com> <fj2kvn$i0p$1 AT ger DOT gmane DOT org> <475581D6 DOT 7070205 AT symantec DOT com> <fj43uf$c36$1 AT ger DOT gmane DOT org> <4756EB42 DOT 70509 AT symantec DOT com> <04c401c8376c$b4bd2730$2e08a8c0 AT CAM DOT ARTIMI DOT COM>
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Your good Dave.

$ echo "y
" | format.com Z: /FS:NTFS /Q /V:zlbl
The type of the file system is RAW.
The new file system is NTFS.

WARNING, ALL DATA ON NON_REMOVABLE DISK
DRIVE Z: WILL BE LOST!
Proceed with Format (Y/N)?
QuickFormatting 100m
Creating file system structures.
Format complete.
    102399 KB total disk space.
    100126 KB are available

Yay!  Thank you.

-srp



Dave Korn wrote:
> On 05 December 2007 18:18, srp wrote:
> 
>> windbg stack after answering "Proceed with Format (Y/N)?" is
>> 0:002> ~*
>>     0  Id: 5bc.ce0 Suspend: 1 Teb: 7ffdf000 Unfrozen
>>        Start: format!mainCRTStartup (010067ea)
>>        Priority: 0  Priority class: 32  Affinity: f
>>     1  Id: 5bc.fac Suspend: 1 Teb: 7ffde000 Unfrozen
>>        Start: kernel32!BaseThreadStartThunk (77e617ec)
>>        Priority: 0  Priority class: 32  Affinity: f
>> .  2  Id: 5bc.d34 Suspend: 1 Teb: 7ffdd000 Unfrozen
>>        Start: ntdll!DbgUiRemoteBreakin (7c83fdb4)
>>        Priority: 0  Priority class: 32  Affinity: f
> 
>   Thread 2 is a special thread created by the debugger to get your process stopped and under debug control by issuing an exception from within the process context.
> 
>   Thread 1 is the cygwin signal-handling thread.
> 
>   Thread 0 is the actual main application itself.
> 
> 
>> 0:001> ~0s
>> ntdll!KiFastSystemCallRet:
>> 7c8285ec c3              ret
>> 0:000> k
>> ChildEBP RetAddr
>> 0006f748 7c82776b ntdll!KiFastSystemCallRet
>> 0006f74c 77e418b2 ntdll!NtReadFile+0xc
>> 0006f7b4 71f8b9ba kernel32!ReadFile+0x16c
>> 0006f7dc 71f84ea8 ulib!PIPE_STREAM::FillBuffer+0x3c
>> 0006f820 71f8523c ulib!BUFFER_STREAM::GetBuffer+0x30
>> 0006f898 71f8c72c ulib!BUFFER_STREAM::ReadString+0x44
>> 0006f8d4 71f8c857 ulib!STREAM_MESSAGE::ReadLine+0x5c
>> 0006f934 01005b8c ulib!STREAM_MESSAGE::IsYesResponse+0x70
>> 0006ff44 01006919 format!main+0x992
>> 0006ffc0 77e6f23b format!mainCRTStartup+0x12f
>> 0006fff0 00000000 kernel32!BaseProcessStart+0x23
> 
>> I am unable to step into ~0 without hitting the hang.
> 
>   I think all this means is that the thread is in a wait state, as in it has called WaitForMultipleObjects or similar.  The thread is not really hung so much as it is in a not-ready-for-scheduling state, so the kernel is not giving it any cpu time.
> 
>> I am able to trace into ~1 after waiting a bit for the initial step to
>> complete. ~1 seems to be spinning un-checked.  I see what seems to be a
>> regular repeated pattern of cmds here.
>>
>> Process Explorer prior to "Proceed with Format (Y/N)?" PE shows the that
>> the thread stack is:
>>     format.com+<address>
>>     ntdll.dll!RtlSetLastWin32ErrorAndNtStatusFromNtStatus+0x59
>>
>> After answering (Y/N)? ntdll.dll! goes away.
>>
>> No new threads start and the format stack does not change.  The state
>> continues to be Wait:Executive and no user or kernel time accumulates.
>> Am I missing the thread seen in windbg or am I stuck in the kernel
>> somewhere?
> 
>   You are seeing thread 0, the main thread, in the wait state.  It might be instructive if you could find out what handle it is waiting for - looking at the presence of "IsYesResponse" in the stack trace, it seems as if despite your pressing Y or N, the key event has not been delivered to wake up the thread.
> 
>     cheers,
>       DaveK


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