iostress/fscmprsn break point

NTFSD
1

While running iostress on Server 2003 build 3718 I get the following break
point every 10-15 hours or so.
It looks like its coming from the program fscmprsn. Any idea what this is
all about and how to prevent it.

I’ve never seen it happen on XP.

Thanks,
Ken

0:
--------------------------------------0:------------------------------------

0:
DestFile contents Dump.
0:num files: 5
Offset NumBytes FileName
0:0x000000000 0x0001e3fff hFile: 0x00000067c
C:\WINDOWS\assembly\GAC\System.Windows.Forms\1.0.3300.0__b77a5c561934e089\Sy
stem.Windows.Forms.dll
0:0x0001e4000 0x0001e40f1 hFile: 0x000000680
C:\WINDOWS\assembly\GAC\System.Windows.Forms\1.0.3300.0__b77a5c561934e089__
AssemblyInfo__.ini
0:0x0001e40f2 0x0003d50f1 hFile: 0x00000064c
C:\WINDOWS\assembly\GAC\System.Windows.Forms\1.0.5000.0__b77a5c561934e089\Sy
stem.Windows.Forms.dll
0:0x0003d50f2 0x0003d5217 hFile: 0x000000684
C:\WINDOWS\assembly\GAC\System.Windows.Forms\1.0.5000.0__b77a5c561934e089__
AssemblyInfo__.ini
0:0x0003d5218 0x0004fffff hFile: 0x000000670
C:\WINDOWS\assembly\GAC\System.Xml\1.0.3200.0__b77a5c561934e089\System.Xml.d
ll
0:
0:Miscompare in fscmprsn.exe during verify.
file: G:\stress\fscmprsn.dat
0:fileSys: NTFS, driveType: 3, nCompressors: 2.
0:IBM DNES-309170Y SA60
0:verifyCount: 0, errPos: 0x2 errCount: 273 errEnd: 0x1ff.
0:processId: 0x864 hFile: 0x00000078c dwAttribs:0x820
0:file offset: 0x000340000 numBytes: 512.
0:buffer: 0x0006757C expBuffer: 0x000677AC
0:exp: 0x1a got: 0x4c
0:unbuf got: 0x0 (0x340000, 0x200) 0x800000
0:
--------------------------------------0:------------------------------------

Break instruction exception - code 80000003 (first chance)
ntdll+dd63:
001b:77f4dd63 cc int 3
0: kd> kb
ChildEBP RetAddr Args to Child
WARNING: Stack unwind information not available. Following frames may be
wrong.
00067518 010045d2 00069574 00000002 0000078c ntdll+0xdd63
000679bc 01002bf1 00000000 00000002 00069574 ios_fscmprsn+0x45d2
000679d4 0100394b 00000002 00000000 00000000 ios_fscmprsn+0x2bf1
00067c44 0100372d 0006fe1c 00000000 00069574 ios_fscmprsn+0x394b
00067eb0 0100384a 0006fe1c 00000000 00069574 ios_fscmprsn+0x372d
0006811c 0100372d 0006fe1c 00000000 00069574 ios_fscmprsn+0x384a
00068388 0100384a 0006fe1c 00000000 00069574 ios_fscmprsn+0x372d
000685f4 0100372d 0006fe1c 00000000 00069574 ios_fscmprsn+0x384a
00068860 0100384a 0006fe1c 00000000 00069574 ios_fscmprsn+0x372d
00068acc 0100372d 0006fe1c 00000000 00069574 ios_fscmprsn+0x384a
00068d38 0100384a 0006fe1c 0006fe00 00069574 ios_fscmprsn+0x372d
00068fa4 0100372d 0006fe1c 0006fe00 00069574 ios_fscmprsn+0x384a
00069210 010028c9 0006fe1c 00000000 00000000 ios_fscmprsn+0x372d
0006ff44 010063bb 00000003 00763dd8 00762b70 ios_fscmprsn+0x28c9
0006ffc0 77e58285 00000000 00000000 7ffdf000 ios_fscmprsn+0x63bb
0006fff0 00000000 0100628c 00000000 78746341 kernel32+0x18285

2

Ken -

I seem to recall seeing this problem at PlugFest last Sept. Not sure what
the resolution was. It might have been a problem in fscmprsn or your filter
is messing with user buffers.

You should be able to disable user-mode breakpoints in Windbg?

/ted

-----Original Message-----
From: Ken Galipeau [mailto:xxxxx@legato.com]
Sent: Friday, January 31, 2003 11:36 AM
To: File Systems Developers
Subject: [ntfsd] iostress/fscmprsn break point

While running iostress on Server 2003 build 3718 I get the following break
point every 10-15 hours or so.
It looks like its coming from the program fscmprsn. Any idea what this is
all about and how to prevent it.

I’ve never seen it happen on XP.

Thanks,
Ken

0:
--------------------------------------0:------------------------------------

0:
DestFile contents Dump.
0:num files: 5
Offset NumBytes FileName
0:0x000000000 0x0001e3fff hFile: 0x00000067c
C:\WINDOWS\assembly\GAC\System.Windows.Forms\1.0.3300.0__b77a5c561934e089\Sy
stem.Windows.Forms.dll
0:0x0001e4000 0x0001e40f1 hFile: 0x000000680
C:\WINDOWS\assembly\GAC\System.Windows.Forms\1.0.3300.0__b77a5c561934e089__
AssemblyInfo__.ini
0:0x0001e40f2 0x0003d50f1 hFile: 0x00000064c
C:\WINDOWS\assembly\GAC\System.Windows.Forms\1.0.5000.0__b77a5c561934e089\Sy
stem.Windows.Forms.dll
0:0x0003d50f2 0x0003d5217 hFile: 0x000000684
C:\WINDOWS\assembly\GAC\System.Windows.Forms\1.0.5000.0__b77a5c561934e089__
AssemblyInfo__.ini
0:0x0003d5218 0x0004fffff hFile: 0x000000670
C:\WINDOWS\assembly\GAC\System.Xml\1.0.3200.0__b77a5c561934e089\System.Xml.d
ll
0:
0:Miscompare in fscmprsn.exe during verify.
file: G:\stress\fscmprsn.dat
0:fileSys: NTFS, driveType: 3, nCompressors: 2.
0:IBM DNES-309170Y SA60
0:verifyCount: 0, errPos: 0x2 errCount: 273 errEnd: 0x1ff.
0:processId: 0x864 hFile: 0x00000078c dwAttribs:0x820
0:file offset: 0x000340000 numBytes: 512.
0:buffer: 0x0006757C expBuffer: 0x000677AC
0:exp: 0x1a got: 0x4c
0:unbuf got: 0x0 (0x340000, 0x200) 0x800000
0:
--------------------------------------0:------------------------------------

Break instruction exception - code 80000003 (first chance)
ntdll+dd63:
001b:77f4dd63 cc int 3
0: kd> kb
ChildEBP RetAddr Args to Child
WARNING: Stack unwind information not available. Following frames may be
wrong.
00067518 010045d2 00069574 00000002 0000078c ntdll+0xdd63
000679bc 01002bf1 00000000 00000002 00069574 ios_fscmprsn+0x45d2
000679d4 0100394b 00000002 00000000 00000000 ios_fscmprsn+0x2bf1
00067c44 0100372d 0006fe1c 00000000 00069574 ios_fscmprsn+0x394b
00067eb0 0100384a 0006fe1c 00000000 00069574 ios_fscmprsn+0x372d
0006811c 0100372d 0006fe1c 00000000 00069574 ios_fscmprsn+0x384a
00068388 0100384a 0006fe1c 00000000 00069574 ios_fscmprsn+0x372d
000685f4 0100372d 0006fe1c 00000000 00069574 ios_fscmprsn+0x384a
00068860 0100384a 0006fe1c 00000000 00069574 ios_fscmprsn+0x372d
00068acc 0100372d 0006fe1c 00000000 00069574 ios_fscmprsn+0x384a
00068d38 0100384a 0006fe1c 0006fe00 00069574 ios_fscmprsn+0x372d
00068fa4 0100372d 0006fe1c 0006fe00 00069574 ios_fscmprsn+0x384a
00069210 010028c9 0006fe1c 00000000 00000000 ios_fscmprsn+0x372d
0006ff44 010063bb 00000003 00763dd8 00762b70 ios_fscmprsn+0x28c9
0006ffc0 77e58285 00000000 00000000 7ffdf000 ios_fscmprsn+0x63bb
0006fff0 00000000 0100628c 00000000 78746341 kernel32+0x18285

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