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Subject: bug#29826: nondeterministic Broken pipe
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From: Alex Vong <alexvong1995@HIDDEN>
Date: Sun, 24 Dec 2017 04:23:44 +0800
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--=-=-=
Content-Type: text/plain
Hello,
I get the following error when running ``guix --version | head -n 1''. I
can get similar after replacing ``--version'' with ``--help''. Also, the
error is nondeterministic. Any idea?
$ LC_ALL=C guix --version | head -n 1
guix (GNU Guix) 91213c384b62bc422896d39005efa922e4fa75f2
Backtrace:
In ice-9/boot-9.scm:
160: 14 [catch #t #<catch-closure 5628460c6140> ...]
In unknown file:
?: 13 [apply-smob/1 #<catch-closure 5628460c6140>]
In ice-9/boot-9.scm:
66: 12 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
432: 11 [eval # #]
In ice-9/boot-9.scm:
2404: 10 [save-module-excursion #<procedure 5628460e8900 at ice-9/boot-9.scm:4051:3 ()>]
4056: 9 [#<procedure 5628460e8900 at ice-9/boot-9.scm:4051:3 ()>]
1727: 8 [%start-stack load-stack ...]
1732: 7 [#<procedure 5628460fdb40 ()>]
In unknown file:
?: 6 [primitive-load "/usr/local/bin/guix"]
In guix/ui.scm:
390: 5 [show-version-and-exit "guix"]
In ice-9/format.scm:
1593: 4 [format #t "Copyright ~a 2017 ~a" "(C)" "the Guix authors\n"]
766: 3 [format:format-work "Copyright ~a 2017 ~a" ("(C)" "the Guix authors\n")]
264: 2 [tilde-dispatch]
73: 1 [format:out-obj-padded #f "the Guix authors\n" #f ()]
In unknown file:
?: 0 [display "the Guix authors\n" #<output: file 1>]
ERROR: In procedure display:
ERROR: In procedure scm_flush: Broken pipe
Backtrace:
In ice-9/boot-9.scm:
160: 1 [catch #t #<catch-closure 562846cd3020> ...]
In unknown file:
?: 0 [apply-smob/1 #<catch-closure 562846cd3020>]
ERROR: In procedure apply-smob/1:
ERROR: In procedure scm_flush: Broken pipe
Cheers,
Alex
--=-=-=
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Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Alex Vong <alexvong1995@HIDDEN> Subject: bug#29826: Acknowledgement (nondeterministic Broken pipe) Message-ID: <handler.29826.B.15140606569479.ack <at> debbugs.gnu.org> References: <874lohdwhb.fsf@HIDDEN> X-Gnu-PR-Message: ack 29826 X-Gnu-PR-Package: guix Reply-To: 29826 <at> debbugs.gnu.org Date: Sat, 23 Dec 2017 20:25:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-guix@HIDDEN If you wish to submit further information on this problem, please send it to 29826 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 29826: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D29826 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: bug#29826: nondeterministic Broken pipe
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Date: Sat, 23 Dec 2017 21:48:28 +0100
From: Andreas Enge <andreas@HIDDEN>
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On Sun, Dec 24, 2017 at 04:23:44AM +0800, Alex Vong wrote:
> ERROR: In procedure display:
> ERROR: In procedure scm_flush: Broken pipe
Interesting! I get a different error message:
ERROR: In procedure display:
In procedure fport_write: Broken pipe
Andreas
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Subject: bug#29826: nondeterministic Broken pipe
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From: Alex Vong <alexvong1995@HIDDEN>
References: <874lohdwhb.fsf@HIDDEN> <20171223204828.GA3290@jurong>
Date: Sun, 24 Dec 2017 16:37:53 +0800
In-Reply-To: <20171223204828.GA3290@jurong> (Andreas Enge's message of "Sat,
23 Dec 2017 21:48:28 +0100")
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Andreas Enge <andreas@HIDDEN> writes:
> On Sun, Dec 24, 2017 at 04:23:44AM +0800, Alex Vong wrote:
>> ERROR: In procedure display:
>> ERROR: In procedure scm_flush: Broken pipe
>
> Interesting! I get a different error message:
>
> ERROR: In procedure display:
> In procedure fport_write: Broken pipe
>
> Andreas
Hmm... This may due to the fact I am using Guile 2.0 instead of 2.2
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X-Loop: help-debbugs@HIDDEN
Subject: bug#29826: nondeterministic Broken pipe
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Alex Vong <alexvong1995@HIDDEN> writes:
> I get the following error when running ``guix --version | head -n 1''. I
> can get similar after replacing ``--version'' with ``--help''. Also, the
> error is nondeterministic. Any idea?
Attempts to write to a pipe that has already been closed on the other
end results in EPIPE. From the write(2) man page:
EPIPE fd is connected to a pipe or socket whose reading end is closed.
When this happens the writing process will also receive a
SIGPIPE signal. (Thus, the write return value is seen only if
the program catches, blocks or ignores this signal.)
In this case, there's a race condition. The result depends on whether
"head -n 1" closes its end of the pipe before or after "guix --version"
is finished writing all of its output. If "head -n 1" closes the pipe
first, then "guix --version" will receive EPIPE while attempting to
write to it.
What normally happens is that the sending process receives SIGPIPE,
which simply causes it to exit prematurely without ever receiving this
error. However, since Guix arranges to ignore SIGPIPE in
'initialize-guix' in guix/ui.scm, we receive EPIPE.
That's what's happening here. I'll need to think on how best to fix it.
Regards,
Mark
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Subject: bug#29826: nondeterministic Broken pipe
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From: Alex Vong <alexvong1995@HIDDEN>
References: <874lohdwhb.fsf@HIDDEN> <87d133lqsb.fsf@HIDDEN>
Date: Mon, 25 Dec 2017 22:02:58 +0800
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--=-=-=
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Mark H Weaver <mhw@HIDDEN> writes:
> Alex Vong <alexvong1995@HIDDEN> writes:
>
>> I get the following error when running ``guix --version | head -n 1''. I
>> can get similar after replacing ``--version'' with ``--help''. Also, the
>> error is nondeterministic. Any idea?
>
> Attempts to write to a pipe that has already been closed on the other
> end results in EPIPE. From the write(2) man page:
>
> EPIPE fd is connected to a pipe or socket whose reading end is closed.
> When this happens the writing process will also receive a
> SIGPIPE signal. (Thus, the write return value is seen only if
> the program catches, blocks or ignores this signal.)
>
> In this case, there's a race condition. The result depends on whether
> "head -n 1" closes its end of the pipe before or after "guix --version"
> is finished writing all of its output. If "head -n 1" closes the pipe
> first, then "guix --version" will receive EPIPE while attempting to
> write to it.
>
> What normally happens is that the sending process receives SIGPIPE,
> which simply causes it to exit prematurely without ever receiving this
> error. However, since Guix arranges to ignore SIGPIPE in
> 'initialize-guix' in guix/ui.scm, we receive EPIPE.
>
> That's what's happening here. I'll need to think on how best to fix it.
>
> Regards,
> Mark
Nice explaination as always! I forget to mention that I reported a bug
of similar flavour before <http://bugs.gnu.org/27017>. I agree that
thought is needed to fix all instances of this type of bug.
Cheers,
Alex
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Subject: bug#29826: nondeterministic Broken pipe
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Content preview: Hi,
Alex Vong <alexvong1995@HIDDEN> skribis: > Mark H Weaver
<mhw@HIDDEN> writes: > >> Alex Vong <alexvong1995@HIDDEN> writes:
>> >>> I get the following error when running ``guix --version | head -n 1''.
I >>> can get similar after replacing ``--version'' with ``--help''. Also,
the >>> error is nondeterministic. Any idea? >> >> Attempts to write to a
pipe that has already been closed on the other >> end results in EPIPE. From
the write(2) man page: >> >> EPIPE fd is connected to a pipe or socket whose
reading end is closed. >> When this happens the writing process will also
receive a >> SIGPIPE signal. (Thus, the write return value is seen only if
>> the program catches, blocks or ignores this signal.) >> >> In this case,
there's a race condition. The result depends on whether >> "head -n 1" closes
its end of the pipe before or after "guix --version" >> is finished writing
all of its output. If "head -n 1" closes the pipe >> first,
then "guix --version"
will receive EPIPE while attempting to >> write to it. >> >> What normally
happens is that the sending process receives SIGPIPE, >> which simply causes
it to exit prematurely without ever receiving this >> error. However, since
Guix arranges to ignore SIGPIPE in >> 'initialize-guix' in guix/ui.scm, we
receive EPIPE. >> >> That's what's happening here. I'll need to think on
how best to fix it. >> >> Regards, >> Mark > > Nice explaination as always!
I forget to mention that I reported a bug > of similar flavour before
<http://bugs.gnu.org/27017>.
I agree that > thought is needed to fix all instances of this type of bug.
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Content preview: Hi, Alex Vong <alexvong1995@HIDDEN> skribis: > Mark H Weaver
<mhw@HIDDEN> writes: > >> Alex Vong <alexvong1995@HIDDEN> writes:
>> >>> I get the following error when running ``guix --version | head -n 1''.
I >>> can get similar after replacing ``--version'' with ``--help''. Also,
the >>> error is nondeterministic. Any idea? >> >> Attempts to write to a
pipe that has already been closed on the other >> end results in EPIPE. From
the write(2) man page: >> >> EPIPE fd is connected to a pipe or socket whose
reading end is closed. >> When this happens the writing process will also
receive a >> SIGPIPE signal. (Thus, the write return value is seen only if
>> the program catches, blocks or ignores this signal.) >> >> In this case,
there's a race condition. The result depends on whether >> "head -n 1" closes
its end of the pipe before or after "guix --version" >> is finished writing
all of its output. If "head -n 1" closes the pipe >> first, then "guix --version"
will receive EPIPE while attempting to >> write to it. >> >> What normally
happens is that the sending process receives SIGPIPE, >> which simply causes
it to exit prematurely without ever receiving this >> error. However, since
Guix arranges to ignore SIGPIPE in >> 'initialize-guix' in guix/ui.scm, we
receive EPIPE. >> >> That's what's happening here. I'll need to think on
how best to fix it. >> >> Regards, >> Mark > > Nice explaination as always!
I forget to mention that I reported a bug > of similar flavour before <http://bugs.gnu.org/27017>.
I agree that > thought is needed to fix all instances of this type of bug.
[...]
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Hi,
Alex Vong <alexvong1995@HIDDEN> skribis:
> Mark H Weaver <mhw@HIDDEN> writes:
>
>> Alex Vong <alexvong1995@HIDDEN> writes:
>>
>>> I get the following error when running ``guix --version | head -n 1''. I
>>> can get similar after replacing ``--version'' with ``--help''. Also, the
>>> error is nondeterministic. Any idea?
>>
>> Attempts to write to a pipe that has already been closed on the other
>> end results in EPIPE. From the write(2) man page:
>>
>> EPIPE fd is connected to a pipe or socket whose reading end is closed.
>> When this happens the writing process will also receive a
>> SIGPIPE signal. (Thus, the write return value is seen only if
>> the program catches, blocks or ignores this signal.)
>>
>> In this case, there's a race condition. The result depends on whether
>> "head -n 1" closes its end of the pipe before or after "guix --version"
>> is finished writing all of its output. If "head -n 1" closes the pipe
>> first, then "guix --version" will receive EPIPE while attempting to
>> write to it.
>>
>> What normally happens is that the sending process receives SIGPIPE,
>> which simply causes it to exit prematurely without ever receiving this
>> error. However, since Guix arranges to ignore SIGPIPE in
>> 'initialize-guix' in guix/ui.scm, we receive EPIPE.
>>
>> That's what's happening here. I'll need to think on how best to fix it.
>>
>> Regards,
>> Mark
>
> Nice explaination as always! I forget to mention that I reported a bug
> of similar flavour before <http://bugs.gnu.org/27017>. I agree that
> thought is needed to fix all instances of this type of bug.
Not sure! We specifically ignore EPIPE in cases where it matters, such
as for the output of =E2=80=98guix package --search=E2=80=99, =E2=80=98guix=
package -A=E2=80=99, etc.
In other cases, it=E2=80=99s probably an error, so it=E2=80=99s worth repor=
ting.
WDYT?
In C such errors are usually ignored, which is nice for shell hackery
but otherwise not so great.
Ludo=E2=80=99.
X-Loop: help-debbugs@HIDDEN
Subject: bug#29826: nondeterministic Broken pipe
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From: Alex Vong <alexvong1995@HIDDEN>
References: <874lohdwhb.fsf@HIDDEN> <87d133lqsb.fsf@HIDDEN>
<87608uaorx.fsf@HIDDEN> <87k1x32on0.fsf@HIDDEN>
Date: Tue, 02 Jan 2018 20:07:41 +0800
In-Reply-To: <87k1x32on0.fsf@HIDDEN> ("Ludovic
\=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\=
\=\?utf-8\?Q\?s\?\= message of "Sun, 31 Dec 2017 11:11:15 +0100")
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--=-=-=
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Hello,
ludo@HIDDEN (Ludovic Court=C3=A8s) writes:
> Hi,
>
> Alex Vong <alexvong1995@HIDDEN> skribis:
>
>> Mark H Weaver <mhw@HIDDEN> writes:
>>
>>> Alex Vong <alexvong1995@HIDDEN> writes:
>>>
>>>> I get the following error when running ``guix --version | head -n 1''.=
I
>>>> can get similar after replacing ``--version'' with ``--help''. Also, t=
he
>>>> error is nondeterministic. Any idea?
>>>
>>> Attempts to write to a pipe that has already been closed on the other
>>> end results in EPIPE. From the write(2) man page:
>>>
>>> EPIPE fd is connected to a pipe or socket whose reading end is closed.
>>> When this happens the writing process will also receive a
>>> SIGPIPE signal. (Thus, the write return value is seen only if
>>> the program catches, blocks or ignores this signal.)
>>>
>>> In this case, there's a race condition. The result depends on whether
>>> "head -n 1" closes its end of the pipe before or after "guix --version"
>>> is finished writing all of its output. If "head -n 1" closes the pipe
>>> first, then "guix --version" will receive EPIPE while attempting to
>>> write to it.
>>>
>>> What normally happens is that the sending process receives SIGPIPE,
>>> which simply causes it to exit prematurely without ever receiving this
>>> error. However, since Guix arranges to ignore SIGPIPE in
>>> 'initialize-guix' in guix/ui.scm, we receive EPIPE.
>>>
>>> That's what's happening here. I'll need to think on how best to fix it.
>>>
>>> Regards,
>>> Mark
>>
>> Nice explaination as always! I forget to mention that I reported a bug
>> of similar flavour before <http://bugs.gnu.org/27017>. I agree that
>> thought is needed to fix all instances of this type of bug.
>
> Not sure! We specifically ignore EPIPE in cases where it matters, such
> as for the output of =E2=80=98guix package --search=E2=80=99, =E2=80=98gu=
ix package -A=E2=80=99, etc.
> In other cases, it=E2=80=99s probably an error, so it=E2=80=99s worth rep=
orting.
>
> WDYT?
>
> In C such errors are usually ignored, which is nice for shell hackery
> but otherwise not so great.
>
> Ludo=E2=80=99.
Do you mean there are use-cases where the EPIPE signal really means
there is an error? What I think is that the 'guix' command is meant to
be used in a shell script, so it should work nice with other shell tools
in a pipe, including head & tail. But maybe it will cause other problems
if we always ignore EPIPE, I don't know...=20
--=-=-=
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X-Loop: help-debbugs@HIDDEN
Subject: bug#29826: nondeterministic Broken pipe
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<87608uaorx.fsf@HIDDEN> <87k1x32on0.fsf@HIDDEN>
Date: Tue, 02 Jan 2018 14:04:16 -0500
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\=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\=
\=\?utf-8\?Q\?s\?\= message of "Sun, 31 Dec 2017 11:11:15 +0100")
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Hi,
ludo@HIDDEN (Ludovic Court=C3=A8s) writes:
> Alex Vong <alexvong1995@HIDDEN> skribis:
>
>> Mark H Weaver <mhw@HIDDEN> writes:
>>
>>> Alex Vong <alexvong1995@HIDDEN> writes:
>>>
>>>> I get the following error when running ``guix --version | head -n 1''.=
I
>>>> can get similar after replacing ``--version'' with ``--help''. Also, t=
he
>>>> error is nondeterministic. Any idea?
>>>
>>> Attempts to write to a pipe that has already been closed on the other
>>> end results in EPIPE. From the write(2) man page:
>>>
>>> EPIPE fd is connected to a pipe or socket whose reading end is closed.
>>> When this happens the writing process will also receive a
>>> SIGPIPE signal. (Thus, the write return value is seen only if
>>> the program catches, blocks or ignores this signal.)
>>>
>>> In this case, there's a race condition. The result depends on whether
>>> "head -n 1" closes its end of the pipe before or after "guix --version"
>>> is finished writing all of its output. If "head -n 1" closes the pipe
>>> first, then "guix --version" will receive EPIPE while attempting to
>>> write to it.
>>>
>>> What normally happens is that the sending process receives SIGPIPE,
>>> which simply causes it to exit prematurely without ever receiving this
>>> error. However, since Guix arranges to ignore SIGPIPE in
>>> 'initialize-guix' in guix/ui.scm, we receive EPIPE.
>>>
>>> That's what's happening here. I'll need to think on how best to fix it.
>>>
>>> Regards,
>>> Mark
>>
>> Nice explaination as always! I forget to mention that I reported a bug
>> of similar flavour before <http://bugs.gnu.org/27017>. I agree that
>> thought is needed to fix all instances of this type of bug.
>
> Not sure! We specifically ignore EPIPE in cases where it matters, such
> as for the output of =E2=80=98guix package --search=E2=80=99, =E2=80=98gu=
ix package -A=E2=80=99, etc.
> In other cases, it=E2=80=99s probably an error, so it=E2=80=99s worth rep=
orting.
>
> WDYT?
I see from the comment in (guix ui) where SIGPIPE is ignored, the
rationale:
;; Ignore SIGPIPE. If the daemon closes the connection, we prefer to be
;; notified via an EPIPE later.
(sigaction SIGPIPE SIG_IGN)
Instead of unconditionally ignoring SIGPIPE here in (initialize-guix),
it might be better to ignore SIGPIPE only if we open a connection to the
daemon with the intent of mutating the store, and perhaps in some other
cases where we're mutating information on disk (e.g. switching
generations). In those cases, we have a job to do that should ideally
be completed regardless of whether anyone is still listening to our
STDOUT.
However, in many other cases, we don't mutate anything on disk, and our
*only* job is printing information to the user, e.g. when showing
version/usage information, the list of available packages, the list of
generations, etc. In those cases, I think it would be better to let
SIGPIPE kill us, because there is no reason to keep the 'guix' process
alive if its output is going nowhere. These are also the cases where
it's most useful to pipe 'guix' output into other commands.
So, I think we should consider removing (sigaction SIGPIPE SIG_IGN) from
(initialize-guix), and instead putting it in various other selected
places.
What do you think?
Mark
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Subject: bug#29826: nondeterministic Broken pipe
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From: ludo@HIDDEN (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
References: <874lohdwhb.fsf@HIDDEN> <87d133lqsb.fsf@HIDDEN>
<87608uaorx.fsf@HIDDEN> <87k1x32on0.fsf@HIDDEN>
<87inckxetr.fsf@HIDDEN>
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In-Reply-To: <87inckxetr.fsf@HIDDEN> (Mark H. Weaver's message of "Tue, 02
Jan 2018 14:04:16 -0500")
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Hello,
Mark H Weaver <mhw@HIDDEN> skribis:
> ludo@HIDDEN (Ludovic Court=C3=A8s) writes:
[...]
>> Not sure! We specifically ignore EPIPE in cases where it matters, such
>> as for the output of =E2=80=98guix package --search=E2=80=99, =E2=80=98g=
uix package -A=E2=80=99, etc.
>> In other cases, it=E2=80=99s probably an error, so it=E2=80=99s worth re=
porting.
>>
>> WDYT?
>
> I see from the comment in (guix ui) where SIGPIPE is ignored, the
> rationale:
>
> ;; Ignore SIGPIPE. If the daemon closes the connection, we prefer to be
> ;; notified via an EPIPE later.
> (sigaction SIGPIPE SIG_IGN)
>
> Instead of unconditionally ignoring SIGPIPE here in (initialize-guix),
> it might be better to ignore SIGPIPE only if we open a connection to the
> daemon with the intent of mutating the store, and perhaps in some other
> cases where we're mutating information on disk (e.g. switching
> generations). In those cases, we have a job to do that should ideally
> be completed regardless of whether anyone is still listening to our
> STDOUT.
>
> However, in many other cases, we don't mutate anything on disk, and our
> *only* job is printing information to the user, e.g. when showing
> version/usage information, the list of available packages, the list of
> generations, etc. In those cases, I think it would be better to let
> SIGPIPE kill us, because there is no reason to keep the 'guix' process
> alive if its output is going nowhere. These are also the cases where
> it's most useful to pipe 'guix' output into other commands.
>
> So, I think we should consider removing (sigaction SIGPIPE SIG_IGN) from
> (initialize-guix), and instead putting it in various other selected
> places.
>
> What do you think?
Why not. An option would be to move (sigaction SIGPIPE SIG_IGN) to
=E2=80=98open-connection=E2=80=99, though that=E2=80=99s not following =E2=
=80=9Clibrary design best
practices.=E2=80=9D
If we do that, can we really remove the =E2=80=98leave-on-EPIPE=E2=80=99 us=
es that we
have in (guix scripts package) for instance? At first sight they are in
=E2=80=98process-query=E2=80=99, which corresponds to operations that don=
=E2=80=99t rely on the
store, so that should be safe.
There are a few other uses of =E2=80=98leave-on-EPIPE=E2=80=99 that happen =
while the
store is opened (in =E2=80=98guix size=E2=80=99, =E2=80=98guix challenge=E2=
=80=99). We=E2=80=99d have to keep
these.
Thoughts?
Ludo=E2=80=99.
X-Loop: help-debbugs@HIDDEN
Subject: bug#29826: nondeterministic Broken pipe
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From: Oleg Pykhalov <go.wigust@HIDDEN>
References: <874lohdwhb.fsf@HIDDEN>
Date: Wed, 14 Feb 2018 15:21:38 +0300
In-Reply-To: <874lohdwhb.fsf@HIDDEN> (Alex Vong's message of "Sun, 24 Dec
2017 04:23:44 +0800")
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--=-=-=
Content-Type: text/plain; charset=utf-8
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Hello Alex,
Alex Vong <alexvong1995@HIDDEN> writes:
> I get the following error when running ``guix --version | head -n 1''. I
> can get similar after replacing ``--version'' with ``--help''. Also, the
> error is nondeterministic. Any idea?
>
> $ LC_ALL=3DC guix --version | head -n 1
> guix (GNU Guix) 91213c384b62bc422896d39005efa922e4fa75f2
As a workaround =E2=80=98LC_ALL=3DC head -n 1 <(guix --version)=E2=80=99.
[=E2=80=A6]
Oleg.
--=-=-=
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