REPLY/6 state of vc

I have “distributed” client/server application. Computers are connected via
ethernet. Lately I have found that client is blocked on vc to server, state
of VC is REPLY/6. Is there any automatic recovery out of this state
(Reply/6) ?

Thanks,

Pavol Kycina

Can you post a sin ver so we can see what version of QNX4 (namely Proc)
you’re using.


Cheers,
Adam

QNX Software Systems Ltd.
[ amallory@qnx.com ]

With a PC, I always felt limited by the software available.
On Unix, I am limited only by my knowledge.
–Peter J. Schoenster <pschon@baste.magibox.net>
“Pavol Kycina” <kycina@microstep-hdo.sk> wrote in message
news:3d32abcf$1@asrpx.mshdo

I have “distributed” client/server application. Computers are connected
via
ethernet. Lately I have found that client is blocked on vc to server,
state
of VC is REPLY/6. Is there any automatic recovery out of this state
(Reply/6) ?

Thanks,

Pavol Kycina

Adam Mallory <amallory@qnx.com> wrote:

Can you post a sin ver so we can see what version of QNX4 (namely Proc)
you’re using.

Also, could you throw in a “sin” and “sin vc” on both sides of the
transaction? That is, on both machines. That would be helpful too,
so that we can see the state of all the pieces involved.

Thanks,
-David


QNX Training Services
http://www.qnx.com/support/training/
Please followup in this newsgroup if you have further questions.

I am attaching several files, output of commands sin, sin ve, sin vc from
both nodes.
Node 12 - db server, Node 10 - client node.

Problem seems to be in state of vcs on node 10.

Thanks, Pavol Kycina




“Adam Mallory” <amallory@qnx.com> wrote in message
news:agut4b$h56$1@nntp.qnx.com

Can you post a sin ver so we can see what version of QNX4 (namely Proc)
you’re using.


Cheers,
Adam

QNX Software Systems Ltd.
[ > amallory@qnx.com > ]

With a PC, I always felt limited by the software available.
On Unix, I am limited only by my knowledge.
–Peter J. Schoenster <> pschon@baste.magibox.net
“Pavol Kycina” <> kycina@microstep-hdo.sk> > wrote in message
news:3d32abcf$> 1@asrpx.mshdo> …
I have “distributed” client/server application. Computers are connected
via
ethernet. Lately I have found that client is blocked on vc to server,
state
of VC is REPLY/6. Is there any automatic recovery out of this state
(Reply/6) ?

Thanks,

Pavol Kycina

\

begin 666 vc10.txt
M("!,3T-!3" @(" @(" @(" @(" @(" @(" @(" @(" @(" @(" @(" @("!2
M14U/5$4*("!6240@("!0240@3$L@("!35$%412!04D]‘4D%-(" @(" @(" @
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M15!,62\V("\O,3 O*F5X<%]A;&%R;5]T9B @(" @,3(@(#DX-C,@,3DX-#4@
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M-3 @(" *,S$U,S4@(" U-S4@(#$@4D503%DO-B O+S$P+RHO97AP7VAD;R @
M(" @(" @,3(@,C P,34@,3DX-#4@+R\Q,B\J+V1B<W)V-3 @(" *,C@V-#(@
M(" W-C0@(#$@4D5!1%DO,2 O+S$P+RHO4G5N+VUA:6X@(" @(" @,3(@,C(W
;-CD@,3DX-#4@+R\Q,B\J+V1B<W)V-3 @(" *
`
end

begin 666 s12.txt
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M(" Q,&@(%)%0U8@(" @(# @(" @,39K(" @(#(P:PH@(#0@(" W-C(@+R\Q
M,"\J+V)I;B]H;W1K97ES(" @(" @,35O("!214-6(" @(" P(" @-C$T-" @
M(" Q-FL
(" V(" @-S8T("\O,3 O2$1/0R]2=6XO;6%I;B @(" @(#$P;R @
M4D5#5B @(" @," @(#@V-&L@(#$U,3EK"B @," @(#<W-B O+S$P+V)I;B]T
M:6YI=" @(" @(" @(" Q,&@(%=!250@(" @+3$@(" @,39K(" @(#(X:PH@
M(# @(" W-SD@+R\Q,"](1$]#+U)U;B]P<F]T,G-Q;" @,3-O(%)%4$Q9(" @
M(" P(" @(#4S:R @(#,Y,VL*(" P(" @-S@R("\O,3 O2$1/0R]2=6XO<’)O
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M-2 O+S$P+V)I;B]L;V=I;B @(" @(" @(" Q,&@4D503%D@(" @,C(@(" @
M,C1K(" @(#(P:PH@(# @(#$Q.3,@+R\Q,"](1$]#+U)U;B]X<F5M,B @(" @
M,3!O("!214-6(" @(" P(" @,C T." @(" Q-FL*(" P(" Q,C P("\O,3 O
M2$1/0R]2=6XO>’)E;3(@(" @(#$P;R @4D5#5B @(" @," @(#(P-#@@(" @
M,39K"B @," @,3(P." O+S$P+TA$3T,O4G5N+WAR96TR(" @(" Q,&@(%)%
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M;B]X<F5M,B @(" @,3!O("!214-6(" @(" P(" @,C T." @(" Q-FL*(" P
M(" T.#,S("\O,3 O2$1/0R]2=6XO>’)E;3(@(" @(#$P;R @4D5#5B @(" @
M," @(#(P-#@@(" @,39K"B @," @-38Y." O+S$P+RHO=7-R+W5C8B]F=’!D
M(" @(" Q,&@4D503%D@(" Q.#$@(" @,C9K(" @(#0P:PH@(# @(#@T,#4@
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M,B @(" T.6L*(" R(" X-3@X("\O,3 O8FEN+VMS:" @(" @(" @(" @(#$P
M;R @5T%)5" @(" M,2 @(" T-VL@(" @-#5K"B @." R,#DS," O+S$P+V)I
M;B]K<V@@(" @(" @(" @(" Q,&@(%=!250@(" @+3$@(" @-#=K(" @(#0U
M:PH@(# @,C$R.#D@+R\Q,"](1$]#+U)U;B]X<F5M,B @(" @,3!O("!214-6
M(" @(" P(" @,C T." @(" Q-FL*(" P(#(R-C U("\O,3 OB]2=6XO:V]M
M;U]G:&]S=" @(#$P;R!215!,62 @(#(T-R @(#,P-S(@(" @-#EK"B @," R
M,S,V-" O+S$P+TA$3T,O4G5N+WAR96TR(" @(" Q,&@(%)%0U8@(" @(# @
M(" R,#0X(" @(#$V:PH@(# @,C0U-38@+R\Q,"\J+W5S<B]U8V(O9G1P9" @
M(" @,3!O(%)%4$Q9(" @,3@Q(" @(#(V:R @(" T,&L
(" P(#(U-S,P("\O
M,3 OB]2=6XO:V]M;U]G:&]S=" @(#$P;R!215!,62 @(#(T-R @(#,P-S(@
M(" @-#EK"B @." R-C<R.2 O+S$P+V)I;B]S:6X@(" @(" @(" @(" Q,&@
M4D503%D@(" @(#$@(" @-#5K(" @(#0Y:PH@(#(@,S(U,S8@+R\Q,"\J+V)I
M;B]E>’!?86QA<FU?=&8@,3!O(%)%4$Q9(#,R-30P(" @(#<W:R @(#(R,6L

`
end

begin 666 vc12.txt
M("!,3T-!3" @(" @(" @(" @(" @(" @(" @(" @(" @(" @(" @(" @("!2
M14U/5$4*("!6240@("!0240@3$L@("!35$%412!04D]‘4D%-(" @(" @(" @
M(" @("!.240@("!6240@("!0240@4%)/1U)!30HR,# Q-2 Q.3@T-2 @,2!2
M15!,62\Q("\O,3(OB]D8G-R=C4P(" @(" @(" Q," S,34S-2 @(#4W-2 O
M+S$P+RHO97AP7VAD;R @( H@.3@V,R Q.3@T-2 @,2!215!,62\Q("\O,3(O
M
B]D8G-R=C4P(" @(" @(" Q," S,C4T," S,C4S-B O+S$P+RIE>’!?86QA
M<FU?=&8*,C V.#D@,3DX-#4@(#$@4D5!1%DO,2 O+S$R+RHO9&)S<G8U," @
M(" @(" @,3,@(" W,3(@,S(Q-C<@+R\Q,R\J9&%T85]D;&]A9&5R"C(R-S8Y
M(#$Y.#0U(" Q(%)%0419+S$@+R\Q,B\J+V1B<W)V-3 @(" @(" @(#$P(#(X
M-C0R(" @-S8T("\O,3 OB]2=6XO;6%I;B @“B W-3,Y(#$Y.#0U(” Q(%)%
M0419+S$@+R\Q,B\J+V1B<W)V-3 @(" @(" @(#$S(#$S,3(Q(" @,C@Q("\O
M,3,O
B]C;&5A;F5R7V1B"C(P,S0Q(#$Y.#0U(" R(%)%0419+S$@+R\Q,B\J
M+V1B<W)V-3 @(" @(" @(#$S(" V,3DT(#$R,38V("\O,3,OB]C;7!?=GES
M;" @“C$Y.#<R(#$Y.#0U(” Q(%)%4$Q9+S$@+R\Q,B\J+V1B<W)V-3 @(" @
M(" @(#$P(" Q,S$P(" @-S@R("\O,3 O
B]P<F]T,G-Q;" @“C$V.# U(” @
M(" Q(" Q(%)%4$Q9+S$@<WES+U!R;V,S,B @(" @(" @(" @(#$P(#$T-C(Y
9(" Y-3 W("\O,3 O8FEN+W-I;B @(" @"@``
`
end

begin 666 ve10.txt
M4%)/1U)!32 @(" @(" @(" @(" @(" @3D%-12 @(" @(" @(%9%4E-)3TX@
M1$%410IS>7,O4’)O8S,R(" @(" @(" @(" @("!0<F]C(" @(" @(" @-“XR
M-4@@(”!397 @,C0@,3DY. IS>7,O4’)O8S,R(" @(" @(" @(" @("!3;&EB
M,38@(" @(" @-“XR,T<@(”!/8W0@,#0@,3DY-@IS>7,O4VQI8C,R(" @(" @
M(" @(" @("!3;&EB,S(@(" @(" @-“XR-$(@(”!!=6<@,3(@,3DY-PHO8FEN
M+T9S>7,@(" @(" @(" @(" @("!&<WES,S(@(" @(" @-“XR-%,@(”!=6P@
M,38@,3DY. HO8FEN+T9S>7,@(" @(" @(" @(" @("!&;&]P<'D@(" @(" @
M-“XR-$(@(”!!=6<@,3D@,3DY-PHO8FEN+T9S>7,N96ED92 @(" @(" @("!E
M:61E(" @(" @(" @-“XR-$T@(”!-87D@,3,@,3DY. HO+S$P+V)I;B]$978S
M,B @(" @(" @("!$978S,B @(" @(" @-“XR,T<@(”!/8W0@,#0@,3DY-@HO
M+S$P+V)I;B]$978S,BYA;G-I(" @("!$978S,BYA;G-I(" @-“XR,T@@(”!.
M;W8@,C$@,3DY-@HO+S$P+V)I;B]$978S,BYS97(@(" @("!$978S,BYS97(@
M(" @-“XR,TD@(”!
=6X@,C<@,3DY-PHO+S$P+V)I;B]$978S,BYS97(@(" @
M("!$978S,BYS97(@(" @-“XR,TD@(”!=6X@,C<@,3DY-PHO+S$P+V)I;B]$
M978S,BYS97(@(" @("!$978S,BYS97(@(" @-“XR,TD@(”!
=6X@,C<@,3DY
M-PHO+S$P+V)I;B]$978S,BYP87(@(" @("!$978S,BYP87(@(" @-“XR,T<@
M(”!/8W0@,#0@,3DY-@HO+S$P+V)I;B]0:7!E(" @(" @(" @("!0:7!E(" @
M(" @(" @-“XR,T$@(”!&96(@,C8@,3DY-@HO+S$P+V)I;B]-;W5S92 @(" @
M(" @("!-;W5S92 @(" @(" @-“XR-$$@(”!!=6<@,C(@,3DY-PHO+S$P+V)I
M;B].970@(" @(" @(" @("!.970@(" @(" @(" @-“XR-4(@(”!=6P@,C<@
M,3DY. HO+S$P+V)I;B].970N971H97(Q,# P("!.970N971H97(Q,# @-“XR
M-$(@(”!
=6P@,C0@,3DY. HO+S$P+V)I;B].970N971H97(Q,# P("!.970N
M971H97(Q,# @-“XR-$(@(”!=6P@,C0@,3DY. HO+S$P+W5S<B]B:6XO;’!S
M<G9R(" @("!L<’-R=G(@(" @(" @-“XR-$$@(”!
=6X@,C8@,3DY-PHO+S$P
M+RHO8FEN+V=R+G9G82 @(" @("!61T$@1W)A9G@@(" @,2XP,T<@("!&96(@
M,C@@,3DY-@HO+S$P+RHO8FEN+W%W<VQI8B @(" @("!15U-L:6(@(" @(" @
M-“XR,48@(”!&96(@,3D@,3DY-@HO+S$P+RHO8FEN+W-C<F5E;B @(" @("!1
M5VEN9&]W<R @(" @-“XR,4(@(”!&96(@,C4@,3DY-@HO+S$P+V)I;B]$;W-F
M<WES(" @(" @("!$;W-F<WES(" @(" @-“XR,T4@(”!*86X@,C$@,3DY-PHO
M+S$P+RHO8FEN+W-C<F5E;E]E=F5N="!15R!E=F5N=" @(" @-“XR,4(@(”!&
M96(@,C4@,3DY-@HO+S$P+V)I;B]$978S,BYP='D@(" @("!$978S,BYP='D@
M(" @-“XR,T<@(”!/8W0@,#0@,3DY-@HO+S$P+RHO=7-R+W5C8B]3;V-K970@
M("!3;V-K970@(" @(" @-“XR,T,@(”!/8W0@,#<@,3DY-@HO+S$P+V)I;B]C
M<F]N(" @(" @(" @("!C<F]N(" @(" @(" @-“XR,T(@(”!/8W0@,S @,3DY
"-PH
end

begin 666 ve12.txt
M4%)/1U)!32 @(" @(" @(" @(" @(" @3D%-12 @(" @(" @(%9%4E-)3TX@
M1$%410IS>7,O4’)O8S,R(" @(" @(" @(" @("!0<F]C(" @(" @(" @-“XR
M-4@@(”!397 @,C0@,3DY. IS>7,O4’)O8S,R(" @(" @(" @(" @("!3;&EB
M,38@(" @(" @-“XR,T<@(”!/8W0@,#0@,3DY-@IS>7,O4VQI8C,R(" @(" @
M(" @(" @("!3;&EB,S(@(" @(" @-“XR-$(@(”!!=6<@,3(@,3DY-PHO8FEN
M+T9S>7,@(" @(" @(" @(" @("!&<WES,S(@(" @(" @-“XR-%,@(”!=6P@
M,38@,3DY. HO8FEN+T9S>7,@(" @(" @(" @(" @("!&;&]P<'D@(" @(" @
M-“XR-$(@(”!!=6<@,3D@,3DY-PHO8FEN+T9S>7,N96ED92 @(" @(" @("!E
M:61E(" @(" @(" @-“XR-$T@(”!-87D@,3,@,3DY. HO+S$R+V)I;B]$978S
M,B @(" @(" @("!$978S,B @(" @(" @-“XR,T<@(”!/8W0@,#0@,3DY-@HO
M+S$R+V)I;B]$978S,BYA;G-I(" @("!$978S,BYA;G-I(" @-“XR,T@@(”!.
M;W8@,C$@,3DY-@HO+S$R+V)I;B]$978S,BYS97(@(" @("!$978S,BYS97(@
M(" @-“XR,TD@(”!
=6X@,C<@,3DY-PHO+S$R+V)I;B]$978S,BYS97(@(" @
M("!$978S,BYS97(@(" @-“XR,TD@(”!=6X@,C<@,3DY-PHO+S$R+V)I;B]$
M978S,BYS97(@(" @("!$978S,BYS97(@(" @-“XR,TD@(”!
=6X@,C<@,3DY
M-PHO+S$R+V)I;B]$978S,BYP87(@(" @("!$978S,BYP87(@(" @-“XR,T<@
M(”!/8W0@,#0@,3DY-@HO+S$R+V)I;B]0:7!E(" @(" @(" @("!0:7!E(" @
M(" @(" @-“XR,T$@(”!&96(@,C8@,3DY-@HO+S$R+V)I;B]-;W5S92 @(" @
M(" @("!-;W5S92 @(" @(" @-“XR-$$@(”!!=6<@,C(@,3DY-PHO+S$R+V)I
M;B].970@(" @(" @(" @("!.970@(" @(" @(" @-“XR-4(@(”!=6P@,C<@
M,3DY. HO+S$R+V)I;B].970N971H97(Q,# P("!.970N971H97(Q,# @-“XR
M-$(@(”!
=6P@,C0@,3DY. HO+S$R+V)I;B].970N<G1L(" @(" @("!.970N
M<G1L(" @(" @-“XR-4,@(”!*86X@,#D@,C P,0HO+S$R+V)I;B]$;W-F<WES
M(" @(" @("!$;W-F<WES(" @(" @-“XR,T4@(”!*86X@,C$@,3DY-PHO+S$R
M+V)I;B]$978S,BYP='D@(" @("!$978S,BYP='D@(" @-“XR,T<@(”!/8W0@
M,#0@,3DY-@HO+S$R+RHO=7-R+W5C8B]3;V-K970@("!3;V-K970@(" @(" @
M-“XR-4,@(”!!=6<@,3D@,3DY. HO+S$R+RHO8FEN+V1B<W)V-3 @(" @("!3
M44P@06YY=VAE<F4@-2XU,$0@(" +R\Q,B]B:6XO8W)O;B @(" @(" @(" @
A8W)O;B @(" @(" @(#0N,C-"(" @3V-T(#,P(#$Y.3<

`
end

Pavol Kycina <kycina@microstep-hdo.sk> wrote:

I am attaching several files, output of commands sin, sin ve, sin vc from
both nodes.
Node 12 - db server, Node 10 - client node.

Problem seems to be in state of vcs on node 10.

I’ve looked at the various outputs – it looks like you have a
client shown as REPLY blocked on the vc, with both ends of the
vc showing a REPLY blocked state, and the server still alive.

This looks like a sane & healthy state for the vcs from the OS
point of view.

So, what is the problem? In your original question, you asked whether
there is some way to break out of that state – if the server has set
the _PPF_SIGCATCH flag (check “sin fl” on node 12), then the client
can’t be broken out with a signal unless the server releases it.

/bin/kill_vcs is a sledgehammer, no make that a chainsaw, that will
rip down all vcs associated with a node – but it does not do it in
a clean way, it forces them all to fail by playing with polling and
such. It can not be used to deal with individual vcs.

The other thing to look at is the process the vcs are attached to:
dbserver50 – is it in a sane & healthy state? Are those REPLY blocked
vcs/processes because it is still working on their requests? Or, has
it somehow “forgotten” about them? If it has such a bug, and it is
_PPF_SIGCATCH, then that is a problem that can really only be solved
at its end.

-David

QNX Training Services
http://www.qnx.com/support/training/
Please followup in this newsgroup if you have further questions.

“David Gibbs” <dagibbs@qnx.com> wrote in message
news:ah1fv9$h2j$1@nntp.qnx.com

Pavol Kycina <> kycina@microstep-hdo.sk> > wrote:
I am attaching several files, output of commands sin, sin ve, sin vc
from
both nodes.
Node 12 - db server, Node 10 - client node.

Problem seems to be in state of vcs on node 10.

I’ve looked at the various outputs – it looks like you have a
client shown as REPLY blocked on the vc, with both ends of the
vc showing a REPLY blocked state, and the server still alive.

This looks like a sane & healthy state for the vcs from the OS
point of view.

So, what is the problem? In your original question, you asked whether
there is some way to break out of that state – if the server has set
the _PPF_SIGCATCH flag (check “sin fl” on node 12), then the client
can’t be broken out with a signal unless the server releases it.

/bin/kill_vcs is a sledgehammer, no make that a chainsaw, that will
rip down all vcs associated with a node – but it does not do it in
a clean way, it forces them all to fail by playing with polling and
such. It can not be used to deal with individual vcs.

The other thing to look at is the process the vcs are attached to:
dbserver50 – is it in a sane & healthy state? Are those REPLY blocked
vcs/processes because it is still working on their requests? Or, has
it somehow “forgotten” about them? If it has such a bug, and it is
_PPF_SIGCATCH, then that is a problem that can really only be solved
at its end.

dbserver seems to be in healthy state, several other clients talk to it
successfully. It must have “forgotten” about these two clients. The problem
is that dbserver is Sybase SQL Anywhere server, which is no longer
supported. ;-(

Thank you very much,

Pavol Kycina