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Subject: RE: cygwin 1.5.20-1, spinning pdksh, 100% CPU
Date: Wed, 1 Aug 2007 14:13:14 -0400
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From: "Ernie Coskrey" <Ernie DOT Coskrey AT steeleye DOT com>
To: <cygwin AT cygwin DOT com>
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> -----Original Message-----
> From: Igor Peshansky [mailto:pechtcha AT cs DOT nyu DOT edu]
> > Here's a stack trace of the thread where the spin is occurring.  The
> > other threads in the process are quiet - the signal thread is is
> > ReadFile as expected, and the other threads are all in stub routines
> > doing WaitForSingleObject.
> >
> > (gdb) bt
> > #0  handle_sigsuspend (tempmask=0)
> >     at ../../../../src/winsup/cygwin/exceptions.cc:694
> > #1  0x61094b93 in sigsuspend (set=0x42db80)
> >     at ../../../../src/winsup/cygwin/signal.cc:477
> > #2  0x610917b8 in _sigfe () at
> > ../../../../src/winsup/cygwin/cygserver.h:82
> > #3  0x0022c588 in ?? ()
> > #4  0x600301dc in ?? ()
>       ^^^^^^^^^^
> This frame is suspicious.  It's some sort of a DLL, but not
> Cygwin1.dll.
> Can you use Process Explorer or something to find out what DLL is
> loaded
> in that range?  It might be something injected by an
antivirus/firewall
> on
> the list of dodgy apps...
> 
> > #5  0x006854d8 in ?? ()
> > #6  0x00000003 in ?? ()
> > #7  0x0022c588 in ?? ()
> > #8  0x006874b8 in ?? ()
> > #9  0x006854d8 in ?? ()
> > #10 0x00000003 in ?? ()
> > #11 0x0022c5a8 in ?? ()
> > #12 0x004126e0 in waitlast () at ../src/jobs.c:729
> > #13 0x004126e0 in waitlast () at ../src/jobs.c:729
> > #14 0x0040b160 in expand (
> >     cp=0x6874b8
> >
>
"\001R\001M\001T\001I\001N\001S\001R\001E\001A\001S\001O\001N\001=\003$
> L
> > KBIN/ins_list -d \"$EQVRMTSYS\" -t \"$EQVRMTTAG\" 2>NUL: | cut
-d\001
> > -f8", wp=0x22c6b0, f=32) at ../src/eval.c:533
> > #15 0x0040a654 in evalstr (
> >     cp=0x6874b8
> >
>
"\001R\001M\001T\001I\001N\001S\001R\001E\001A\001S\001O\001N\001=\003$
> L
> > KBIN/ins_list -d \"$EQVRMTSYS\" -t \"$EQVRMTTAG\" 2>NUL: | cut
-d\001
> > -f8", f=32) at ../src/eval.c:113
> > #16 0x0040d80a in comexec (t=0x6871e0, tp=0x0, ap=0x687350, flags=0)
> >     at ../src/exec.c:555
> > #17 0x0040cc7d in execute (t=0x6871e0, flags=0) at ../src/exec.c:155
> > #18 0x0040ce39 in execute (t=0x687778, flags=0) at ../src/exec.c:192
> > #19 0x0040d311 in execute (t=0x686620, flags=1) at ../src/exec.c:367
> > #20 0x004124c1 in exchild (t=0x686620, flags=74, close_fd=0)
> >     at ../src/jobs.c:641
> > #21 0x0040cdf6 in execute (t=0x686620, flags=10) at
../src/exec.c:185
> > #22 0x0040ce62 in execute (t=0x688470, flags=0) at ../src/exec.c:195
> > #23 0x0040d311 in execute (t=0x684ee0, flags=0) at ../src/exec.c:367
> > #24 0x0041766e in shell (s=0x6839b8, toplevel=1) at
../src/main.c:616
> > #25 0x00417204 in main (argc=6, argv=0x61171f74) at
../src/main.c:429
> >
> > Please let me know if there's any other information that would be
> > useful.  Thanks!
> 
> It would also be nice to find out what static library is linked into
> the
> 0x0022XXXX space...
> 	Igor

I'm not sure how gdb does backtrace across _sigfe and _sigbe - I think
there's some "stack magic" that happens in these routines.  The bt
output doesn't make sense to me between entries #3 and #11.  I'm pretty
sure that these addresses are invalid - for instance 22c588 is a stack
location on this thread, and "3" is obviously not a function address.
The addresses don't match up with any loaded DLL's:

(gdb) info dll
DLL Name                                   Load Address
/cygdrive/c/WINDOWS/system32/ntdll.dll     7c801000
/cygdrive/c/WINDOWS/system32/kernel32.dll  77e41000
/bin/cygwin1.dll                           61001000
/cygdrive/c/WINDOWS/system32/advapi32.dll  77f51000
/cygdrive/c/WINDOWS/system32/rpcrt4.dll    77c51000
/cygdrive/c/WINDOWS/system32/secur32.dll   76f51000
/cygdrive/c/WINDOWS/system32/psapi.dll     76b71000
/cygdrive/c/WINDOWS/system32/winmm.dll     76aa1000
/cygdrive/c/WINDOWS/system32/user32.dll    77381000
/cygdrive/c/WINDOWS/system32/gdi32.dll     77c01000
/cygdrive/c/WINDOWS/system32/imm32.dll     76291000
/cygdrive/c/WINDOWS/system32/lpk.dll       7f001000
/cygdrive/c/WINDOWS/system32/usp10.dll     75491000
/cygdrive/c/WINDOWS/system32/rdpsnd.dll    71bc1000
/cygdrive/c/WINDOWS/system32/winsta.dll    771f1000
/cygdrive/c/WINDOWS/system32/msvcrt.dll    77ba1000
/cygdrive/c/WINDOWS/system32/netapi32.dll  71c41000

The stack itself looks pretty nice - you can trace straight back from
cancelable_wait down into pdksh code (%ebp is 0x22c518):

0x22c518:       0x0022c548      0x61017667      0x00000000
0x600301dc
0x22c528:       0x61117610      0x61117630      0x00000000
0x00000000
0x22c538:       0x0022c568      0x006874b8      0x006842a0
0x00000004
0x22c548:       0x0022c558      0x61094b93      0x00000000
0x006874b8
0x22c558:       0x0022c588      0x610917b8      0x0042db80
0x0068b3f0
0x22c568:       0x0022c588      0x600301dc      0x006854d8
0x00000003
0x22c578:       0x0022c588      0x006874b8      0x006854d8
0x00000003
0x22c588:       0x0022c5a8      0x004126e0      0x006842a0
0x00000000
0x22c598:       0x0042972b      0x006874b8      0x00000000
0x006874b8
0x22c5a8:       0x0022c698      0x0040b160      0x0068b3f0
0x00000000
0x22c5b8:       0x0068a614      0x00000001      0x0022c680
0x00000019
0x22c5c8:       0x0068bbe8      0x00000000      0x61171d44
0x00680000
0x22c5d8:       0x00000000      0xffffffff      0x61171dd4
0x00000001
0x22c5e8:       0x00000000      0x00000000      0x00000001
0x00000000
0x22c5f8:       0x0022c640      0x00000000      0x00000000
0x00000000
0x22c608:       0x00687518      0x00000000      0x00000004
0x00685470
0x22c618:       0x0068ad98      0x00000000      0x00000001
0x61104ab4
0x22c628:       0x00000003      0x00000001      0x00000668
0x0068a614
0x22c638:       0x00685478      0x610564f7      0x0068ad98
0x006854bc
0x22c648:       0x00000001      0x0068ad60      0x0068ad60
0x00000000
0x22c658:       0x00685ae0      0x00000001      0x00000000
0x0068b3f0
0x22c668:       0x0022c698      0x00400001      0x00685530
0x006854b0
0x22c678:       0x00000080      0x0068a614      0x00000001
0x006854bc
0x22c688:       0x000000cb      0x006874b8      0x00000000
0x00687350
0x22c698:       0x0022c6c8      0x0040a654      0x006874b8
0x0022c6b0
0x22c6a8:       0x00000020      0x6105642c      0x00685498
0x00685498
0x22c6b8:       0x0068549c      0x0000001d      0x00000000
0x00000000
0x22c6c8:       0x0022c718      0x0040d80a      0x006874b8
0x00000020
0x22c6d8:       0x0068a610      0x00000000      0x0000001d
0x00000000

Ernie Coskrey
SteelEye Technology, Inc.

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