GNU logs - #30986, boring messages

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Subject: bug#30986: =?UTF-8?Q?=E2=80=98guix_?= =?UTF-8?Q?substitute=E2=80=99?= spins forever
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From: ludo@HIDDEN (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Date: Thu, 29 Mar 2018 17:18:40 +0200
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I=E2=80=99ve stumbled upon a situation where =E2=80=98guix substitute=E2=80=
=99 would spin
endlessly.  Tracing the =E2=80=98guix substitute=E2=80=99 process shows tha=
t the
following two =E2=80=9Cinfo=E2=80=9D queries would happen in a loop:

--8<---------------cut here---------------start------------->8---
read(0, "info /gnu/store/cwmia787gmr4pypna6na1nfirqlr8y0p-gcc-5.5.0 \n", 40=
96) =3D 60
openat(AT_FDCWD, "/var/guix/substitute/cache/bzh2rehitrzflwj2f3tcyt25s7xn3h=
wbhxey3r7suq2a65qr2ulq/cwmia787gmr4pypna6na1nfirqlr8y0p", O_RDONLY) =3D 13
fstat(13, {st_mode=3DS_IFREG|0600, st_size=3D1288, ...}) =3D 0
lseek(13, 0, SEEK_CUR)                  =3D 0
read(13, "(narinfo (version 2) (cache-uri \"https://berlin.guixsd.org\") (d=
ate 1522315393) (ttl 3888000) (value \"StorePath: /gnu/store/cwmia787gmr4py=
pna6na1nfirqlr8y0p-gcc-5.5.0\\nURL: nar/gzip/cwmia787gmr4pypna6na1nfirqlr8y=
0p-gcc-5.5.0\\nCompression: gzip\\nNarHash: sha256:039i94jrmfsvn859kjarcmqz=
abs3nspmbz912gy03p0v6n64dr56\\nNarSize: 98156824\\nReferences: 03j2yq30pcd2=
h17np0liarb2jdijg8y4-bash-static-4.4.19 6v2lw5wkb36lwcky5x4i5ris08jabihs-gl=
ibc-2.27 asm7j8dm594ljjv"..., 4096) =3D 1288
close(13)                               =3D 0
write(1, "/gnu/store/cwmia787gmr4pypna6na1nfirqlr8y0p-gcc-5.5.0\n", 54) =3D=
 54
write(1, "/gnu/store/rvmhl8kb58zsj6pg2i2ha8f1dmx8wvm6-gcc-5.5.0.drv\n", 58)=
 =3D 58
write(1, "5\n", 2)                      =3D 2
write(1, "/gnu/store/03j2yq30pcd2h17np0liarb2jdijg8y4-bash-static-4.4.19\n"=
, 63) =3D 63
write(1, "/gnu/store/6v2lw5wkb36lwcky5x4i5ris08jabihs-glibc-2.27\n", 55) =
=3D 55
write(1, "/gnu/store/asm7j8dm594ljjvs0x90h8qivl5qdaz8-gcc-5.5.0-lib\n", 58)=
 =3D 58
write(1, "/gnu/store/cwmia787gmr4pypna6na1nfirqlr8y0p-gcc-5.5.0\n", 54) =3D=
 54
write(1, "/gnu/store/s4nzclq0ma3v19lvg84z8c7nqys9w3ai-zlib-1.2.11\n", 56) =
=3D 56
write(1, "35550259\n", 9)               =3D 9
write(1, "98156824\n", 9)               =3D 9
write(1, "\n", 1)                       =3D 1
read(0, "info /gnu/store/asm7j8dm594ljjvs0x90h8qivl5qdaz8-gcc-5.5.0-lib \n"=
, 4096) =3D 64
openat(AT_FDCWD, "/var/guix/substitute/cache/bzh2rehitrzflwj2f3tcyt25s7xn3h=
wbhxey3r7suq2a65qr2ulq/asm7j8dm594ljjvs0x90h8qivl5qdaz8", O_RDONLY) =3D 13
fstat(13, {st_mode=3DS_IFREG|0600, st_size=3D100, ...}) =3D 0
lseek(13, 0, SEEK_CUR)                  =3D 0
read(13, "(narinfo (version 2) (cache-uri \"https://berlin.guixsd.org\") (d=
ate 1522315402) (ttl 300) (value #f))", 4096) =3D 100
close(13)                               =3D 0
openat(AT_FDCWD, "/var/guix/substitute/cache/s3o7shxygzvof4rs6c3ed5hfifavpy=
43khzg5fyjdmrnlfk3b7va/asm7j8dm594ljjvs0x90h8qivl5qdaz8", O_RDONLY) =3D 13
fstat(13, {st_mode=3DS_IFREG|0600, st_size=3D105, ...}) =3D 0
lseek(13, 0, SEEK_CUR)                  =3D 0
read(13, "(narinfo (version 2) (cache-uri \"https://mirror.hydra.gnu.org\")=
 (date 1522315667) (ttl 10800) (value #f))", 4096) =3D 105
close(13)                               =3D 0
write(1, "\n", 1)                       =3D 1
--8<---------------cut here---------------end--------------->8---

The two store items being requested are outputs of the same derivations:

--8<---------------cut here---------------start------------->8---
$ head -c200 /gnu/store/rvmhl8kb58zsj6pg2i2ha8f1dmx8wvm6-gcc-5.5.0.drv
Derive([("lib","/gnu/store/asm7j8dm594ljjvs0x90h8qivl5qdaz8-gcc-5.5.0-lib",=
"",""),("out","/gnu/store/cwmia787gmr4pypna6na1nfirqlr8y0p-gcc-5.5.0","",""=
)],[("/gnu/store/0iwkdrk73cgpj1bq8jd66i8aca5hcm5v-
--8<---------------cut here---------------end--------------->8---

Another time, something similar happened in the middle of a series of
downloads:

--8<---------------cut here---------------start------------->8---
@ substituter-succeeded /gnu/store/wlkhfzz67h4wc3spj2fy8cvqaq8c60il-pkg-con=
fig-0.29.2
substitute: updating list of substitutes from 'https://berlin.guixsd.org'..=
. 100.0%
substitute: updating list of substitutes from 'https://mirror.hydra.gnu.org=
'... 100.0%
@ substituter-started /gnu/store/68yb572zpkn26skh2dp1z91w2dnmrzzb-libgc-7.6=
.4 /gnu/store/fbpk1zjcqd6p4ny8qx48mvlp4v7qfmld-guix-0.14.0-9.bdf0c64/libexe=
c/guix/substitute
Downloading https://berlin.guixsd.org/nar/gzip/68yb572zpkn26skh2dp1z91w2dnm=
rzzb-libgc-7.6.4...
 libgc-7.6.4  398KiB                                                       =
                                                                           =
                                                              2.2MiB/s 00:0=
0 [##################] 100.0%

@ substituter-succeeded /gnu/store/68yb572zpkn26skh2dp1z91w2dnmrzzb-libgc-7=
.6.4
substitute: updating list of substitutes from 'https://berlin.guixsd.org'..=
. 100.0%

[=E2=80=A6 hangs here=E2=80=A6]
--8<---------------cut here---------------end--------------->8---

While it=E2=80=99s hanging, =E2=80=98guix substitute=E2=80=99 receives this=
 one query in a loop:

--8<---------------cut here---------------start------------->8---
read(0, "info /gnu/store/w91m22j33vxj3vvfa8lv04qjansdzr0d-libgc-7.6.4-debug=
 \n", 4096) =3D 68
openat(AT_FDCWD, "/var/guix/substitute/cache/bzh2rehitrzflwj2f3tcyt25s7xn3h=
wbhxey3r7suq2a65qr2ulq/w91m22j33vxj3vvfa8lv04qjansdzr0d", O_RDONLY) =3D 13
fstat(13, {st_mode=3DS_IFREG|0600, st_size=3D100, ...}) =3D 0
lseek(13, 0, SEEK_CUR)                  =3D 0
read(13, "(narinfo (version 2) (cache-uri \"https://berlin.guixsd.org\") (d=
ate 1522315814) (ttl 300) (value #f))", 4096) =3D 100
close(13)                               =3D 0
openat(AT_FDCWD, "/var/guix/substitute/cache/s3o7shxygzvof4rs6c3ed5hfifavpy=
43khzg5fyjdmrnlfk3b7va/w91m22j33vxj3vvfa8lv04qjansdzr0d", O_RDONLY) =3D 13
fstat(13, {st_mode=3DS_IFREG|0600, st_size=3D105, ...}) =3D 0
lseek(13, 0, SEEK_CUR)                  =3D 0
read(13, "(narinfo (version 2) (cache-uri \"https://mirror.hydra.gnu.org\")=
 (date 1522315814) (ttl 10800) (value #f))", 4096) =3D 105
close(13)                               =3D 0
write(1, "\n", 1)                       =3D 1
--8<---------------cut here---------------end--------------->8---

To unlock it, I did:

--8<---------------cut here---------------start------------->8---
$ sudo rm "/var/guix/substitute/cache/bzh2rehitrzflwj2f3tcyt25s7xn3hwbhxey3=
r7suq2a65qr2ulq/w91m22j33vxj3vvfa8lv04qjansdzr0d"
# =E2=80=A6 narinfo gets redownloaded and file gets regenerated:
$ sudo cat "/var/guix/substitute/cache/bzh2rehitrzflwj2f3tcyt25s7xn3hwbhxey=
3r7suq2a65qr2ulq/w91m22j33vxj3vvfa8lv04qjansdzr0d"
(narinfo (version 2) (cache-uri "https://berlin.guixsd.org") (date 15223164=
03) (ttl 3888000) (value "StorePath: /gnu/store/w91m22j33vxj3vvfa8lv04qjans=
dzr0d-libgc-7.6.4-debug\nURL: nar/gzip/w91m22j33vxj3vvfa8lv04qjansdzr0d-lib=
gc-7.6.4-debug\nCompression: gzip\nNarHash: sha256:0jrrknph5qs3n8v1prmmx4pg=
ixhhdnqjh04i066c3fp12yx35hb7\nNarSize: 1462960\nReferences: 68yb572zpkn26sk=
h2dp1z91w2dnmrzzb-libgc-7.6.4 6v2lw5wkb36lwcky5x4i5ris08jabihs-glibc-2.27 a=
sm7j8dm594ljjvs0x90h8qivl5qdaz8-gcc-5.5.0-lib cwmia787gmr4pypna6na1nfirqlr8=
y0p-gcc-5.5.0 fbclk7l7fn4qh6nwi1xl1wbszhhj6yfd-libatomic-ops-7.6.2\nFileSiz=
e: 543891\nSystem: x86_64-linux\nDeriver: 9c7ilc15k8p5b84lxhgn2jy6l6xgbdpj-=
libgc-7.6.4.drv\nSignature: 1;berlin.guixsd.org;KHNpZ25hdHVyZSAKIChkYXRhIAo=
gIChmbGFncyByZmM2OTc5KQogIChoYXNoIHNoYTI1NiAjRTBGRUExNkQ5ODU5Mjk1QjQ4N0IwOT=
c2RTVFRkIxNDUzRTdCOUVFNkJBNUFBRkY5NUFEQTg1REY5QUJENkI4QSMpCiAgKQogKHNpZy12Y=
WwgCiAgKGVjZHNhIAogICAociAjMDY0MkZCQUYwRDExNDM2NTc3NUY1QTI2REU3NDYyOTMyQzg5=
RjhCM0U4RDg5MzQ4MzRBNTQwRDAwMEVBQTk5QiMpCiAgIChzICMwMzQ1RUFCMDM1MzBEMzRFOTE=
wNzVFMzFFMUFENjM4OEI3NDAwRTQxRjRBOTExRjg0RDE0NEQ3M0QxMkVCMzY5IykKICAgKQogIC=
kKIChwdWJsaWMta2V5IAogIChlY2MgCiAgIChjdXJ2ZSBFZDI1NTE5KQogICAocSAjOEQxNTZGM=
jk1RDI0QjBEOUE4NkZBNTc0MUE4NDBGRjJEMjRGNjBGN0I2QzQxMzQ4MTRBRDU1NjI1OTcxQjM5=
NCMpCiAgICkKICApCiApCg=3D=3D\n"))
--8<---------------cut here---------------end--------------->8---

=E2=80=A6 and the daemon went on to substitute libgc-7.6.4-debug.

This apparently has to do with multiple-output derivations where not all
of the outputs are substitutable.  The loop could come from
SubstitutionGoal::tryNext, which recurses:

    SubstitutablePathInfos infos;
    PathSet dummy(singleton<PathSet>(storePath));
    worker.store.querySubstitutablePathInfos(sub, dummy, infos);
    SubstitutablePathInfos::iterator k =3D infos.find(storePath);
    if (k =3D=3D infos.end()) { tryNext(); return; }
    info =3D k->second;
    hasSubstitute =3D true;

Ludo=E2=80=99.

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: ludo@HIDDEN (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#30986: Acknowledgement (=?UTF-8?Q?=E2=80=98guix_?=
 =?UTF-8?Q?substitute=E2=80=99?= spins forever)
Message-ID: <handler.30986.B.152233674018615.ack <at> debbugs.gnu.org>
References: <87po3mvrjj.fsf@HIDDEN>
X-Gnu-PR-Message: ack 30986
X-Gnu-PR-Package: guix
Reply-To: 30986 <at> debbugs.gnu.org
Date: Thu, 29 Mar 2018 15:19:02 +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.

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30986: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D30986
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Message sent to bug-guix@HIDDEN:

Subject: bug#30986: =?UTF-8?Q?=E2=80=98guix_?= =?UTF-8?Q?substitute=E2=80=99?= spins forever
Resent-From: Simon Tournier <zimon.toutoune@HIDDEN>
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Resent-Date: Mon, 16 Jun 2025 11:50:03 +0000
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To: ludo@HIDDEN (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Cc: 30986 <at> debbugs.gnu.org
From: Simon Tournier <zimon.toutoune@HIDDEN>
In-Reply-To: <87po3mvrjj.fsf@HIDDEN> ("Ludovic =?UTF-8?Q?Court=C3=A8s?="'s message of "Thu, 29 Mar 2018 17:18:40 +0200")
References: <87po3mvrjj.fsf@HIDDEN>
Date: Mon, 16 Jun 2025 12:05:37 +0200
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Hi Ludo,

Digging into the bug tracker for some triage, I hit this:

    https://issues.guix.gnu.org/issue/30986

and it reminds me our recent discussion here:

    https://codeberg.org/guix/guix/issues/430

WDYT?

On Thu, 29 Mar 2018 at 17:18, ludo@HIDDEN (Ludovic Court=C3=A8s) wrote:

> I=E2=80=99ve stumbled upon a situation where =E2=80=98guix substitute=E2=
=80=99 would spin
> endlessly.  Tracing the =E2=80=98guix substitute=E2=80=99 process shows t=
hat the
> following two =E2=80=9Cinfo=E2=80=9D queries would happen in a loop:
>
> read(0, "info /gnu/store/cwmia787gmr4pypna6na1nfirqlr8y0p-gcc-5.5.0 \n", =
4096) =3D 60
> openat(AT_FDCWD, "/var/guix/substitute/cache/bzh2rehitrzflwj2f3tcyt25s7xn=
3hwbhxey3r7suq2a65qr2ulq/cwmia787gmr4pypna6na1nfirqlr8y0p", O_RDONLY) =3D 13
> fstat(13, {st_mode=3DS_IFREG|0600, st_size=3D1288, ...}) =3D 0
> lseek(13, 0, SEEK_CUR)                  =3D 0
> read(13, "(narinfo (version 2) (cache-uri \"https://berlin.guixsd.org\") =
(date 1522315393) (ttl 3888000) (value \"StorePath: /gnu/store/cwmia787gmr4=
pypna6na1nfirqlr8y0p-gcc-5.5.0\\nURL: nar/gzip/cwmia787gmr4pypna6na1nfirqlr=
8y0p-gcc-5.5.0\\nCompression: gzip\\nNarHash: sha256:039i94jrmfsvn859kjarcm=
qzabs3nspmbz912gy03p0v6n64dr56\\nNarSize: 98156824\\nReferences: 03j2yq30pc=
d2h17np0liarb2jdijg8y4-bash-static-4.4.19 6v2lw5wkb36lwcky5x4i5ris08jabihs-=
glibc-2.27 asm7j8dm594ljjv"..., 4096) =3D 1288
> close(13)                               =3D 0
> write(1, "/gnu/store/cwmia787gmr4pypna6na1nfirqlr8y0p-gcc-5.5.0\n", 54) =
=3D 54
> write(1, "/gnu/store/rvmhl8kb58zsj6pg2i2ha8f1dmx8wvm6-gcc-5.5.0.drv\n", 5=
8) =3D 58
> write(1, "5\n", 2)                      =3D 2
> write(1, "/gnu/store/03j2yq30pcd2h17np0liarb2jdijg8y4-bash-static-4.4.19\=
n", 63) =3D 63
> write(1, "/gnu/store/6v2lw5wkb36lwcky5x4i5ris08jabihs-glibc-2.27\n", 55) =
=3D 55
> write(1, "/gnu/store/asm7j8dm594ljjvs0x90h8qivl5qdaz8-gcc-5.5.0-lib\n", 5=
8) =3D 58
> write(1, "/gnu/store/cwmia787gmr4pypna6na1nfirqlr8y0p-gcc-5.5.0\n", 54) =
=3D 54
> write(1, "/gnu/store/s4nzclq0ma3v19lvg84z8c7nqys9w3ai-zlib-1.2.11\n", 56)=
 =3D 56
> write(1, "35550259\n", 9)               =3D 9
> write(1, "98156824\n", 9)               =3D 9
> write(1, "\n", 1)                       =3D 1
> read(0, "info /gnu/store/asm7j8dm594ljjvs0x90h8qivl5qdaz8-gcc-5.5.0-lib \=
n", 4096) =3D 64
> openat(AT_FDCWD, "/var/guix/substitute/cache/bzh2rehitrzflwj2f3tcyt25s7xn=
3hwbhxey3r7suq2a65qr2ulq/asm7j8dm594ljjvs0x90h8qivl5qdaz8", O_RDONLY) =3D 13
> fstat(13, {st_mode=3DS_IFREG|0600, st_size=3D100, ...}) =3D 0
> lseek(13, 0, SEEK_CUR)                  =3D 0
> read(13, "(narinfo (version 2) (cache-uri \"https://berlin.guixsd.org\") =
(date 1522315402) (ttl 300) (value #f))", 4096) =3D 100
> close(13)                               =3D 0
> openat(AT_FDCWD, "/var/guix/substitute/cache/s3o7shxygzvof4rs6c3ed5hfifav=
py43khzg5fyjdmrnlfk3b7va/asm7j8dm594ljjvs0x90h8qivl5qdaz8", O_RDONLY) =3D 13
> fstat(13, {st_mode=3DS_IFREG|0600, st_size=3D105, ...}) =3D 0
> lseek(13, 0, SEEK_CUR)                  =3D 0
> read(13, "(narinfo (version 2) (cache-uri \"https://mirror.hydra.gnu.org\=
") (date 1522315667) (ttl 10800) (value #f))", 4096) =3D 105
> close(13)                               =3D 0
> write(1, "\n", 1)                       =3D 1
>
>
> The two store items being requested are outputs of the same derivations:
>
> $ head -c200 /gnu/store/rvmhl8kb58zsj6pg2i2ha8f1dmx8wvm6-gcc-5.5.0.drv
> Derive([("lib","/gnu/store/asm7j8dm594ljjvs0x90h8qivl5qdaz8-gcc-5.5.0-lib=
","",""),("out","/gnu/store/cwmia787gmr4pypna6na1nfirqlr8y0p-gcc-5.5.0","",=
"")],[("/gnu/store/0iwkdrk73cgpj1bq8jd66i8aca5hcm5v-
>
>
> Another time, something similar happened in the middle of a series of
> downloads:
>
> @ substituter-succeeded /gnu/store/wlkhfzz67h4wc3spj2fy8cvqaq8c60il-pkg-c=
onfig-0.29.2
> substitute: updating list of substitutes from 'https://berlin.guixsd.org'=
... 100.0%
> substitute: updating list of substitutes from 'https://mirror.hydra.gnu.o=
rg'... 100.0%
> @ substituter-started /gnu/store/68yb572zpkn26skh2dp1z91w2dnmrzzb-libgc-7=
.6.4 /gnu/store/fbpk1zjcqd6p4ny8qx48mvlp4v7qfmld-guix-0.14.0-9.bdf0c64/libe=
xec/guix/substitute
> Downloading https://berlin.guixsd.org/nar/gzip/68yb572zpkn26skh2dp1z91w2d=
nmrzzb-libgc-7.6.4...
>  libgc-7.6.4  398KiB                                                     =
                                                                           =
                                                                2.2MiB/s 00=
:00 [##################] 100.0%
>
> @ substituter-succeeded /gnu/store/68yb572zpkn26skh2dp1z91w2dnmrzzb-libgc=
-7.6.4
> substitute: updating list of substitutes from 'https://berlin.guixsd.org'=
... 100.0%
>
> [=E2=80=A6 hangs here=E2=80=A6]
>
>
> While it=E2=80=99s hanging, =E2=80=98guix substitute=E2=80=99 receives th=
is one query in a loop:
>
> read(0, "info /gnu/store/w91m22j33vxj3vvfa8lv04qjansdzr0d-libgc-7.6.4-deb=
ug \n", 4096) =3D 68
> openat(AT_FDCWD, "/var/guix/substitute/cache/bzh2rehitrzflwj2f3tcyt25s7xn=
3hwbhxey3r7suq2a65qr2ulq/w91m22j33vxj3vvfa8lv04qjansdzr0d", O_RDONLY) =3D 13
> fstat(13, {st_mode=3DS_IFREG|0600, st_size=3D100, ...}) =3D 0
> lseek(13, 0, SEEK_CUR)                  =3D 0
> read(13, "(narinfo (version 2) (cache-uri \"https://berlin.guixsd.org\") =
(date 1522315814) (ttl 300) (value #f))", 4096) =3D 100
> close(13)                               =3D 0
> openat(AT_FDCWD, "/var/guix/substitute/cache/s3o7shxygzvof4rs6c3ed5hfifav=
py43khzg5fyjdmrnlfk3b7va/w91m22j33vxj3vvfa8lv04qjansdzr0d", O_RDONLY) =3D 13
> fstat(13, {st_mode=3DS_IFREG|0600, st_size=3D105, ...}) =3D 0
> lseek(13, 0, SEEK_CUR)                  =3D 0
> read(13, "(narinfo (version 2) (cache-uri \"https://mirror.hydra.gnu.org\=
") (date 1522315814) (ttl 10800) (value #f))", 4096) =3D 105
> close(13)                               =3D 0
> write(1, "\n", 1)                       =3D 1
>
>
> To unlock it, I did:
>
> $ sudo rm "/var/guix/substitute/cache/bzh2rehitrzflwj2f3tcyt25s7xn3hwbhxe=
y3r7suq2a65qr2ulq/w91m22j33vxj3vvfa8lv04qjansdzr0d"
> # =E2=80=A6 narinfo gets redownloaded and file gets regenerated:
> $ sudo cat "/var/guix/substitute/cache/bzh2rehitrzflwj2f3tcyt25s7xn3hwbhx=
ey3r7suq2a65qr2ulq/w91m22j33vxj3vvfa8lv04qjansdzr0d"
> (narinfo (version 2) (cache-uri "https://berlin.guixsd.org") (date 152231=
6403) (ttl 3888000) (value "StorePath: /gnu/store/w91m22j33vxj3vvfa8lv04qja=
nsdzr0d-libgc-7.6.4-debug\nURL: nar/gzip/w91m22j33vxj3vvfa8lv04qjansdzr0d-l=
ibgc-7.6.4-debug\nCompression: gzip\nNarHash: sha256:0jrrknph5qs3n8v1prmmx4=
pgixhhdnqjh04i066c3fp12yx35hb7\nNarSize: 1462960\nReferences: 68yb572zpkn26=
skh2dp1z91w2dnmrzzb-libgc-7.6.4 6v2lw5wkb36lwcky5x4i5ris08jabihs-glibc-2.27=
 asm7j8dm594ljjvs0x90h8qivl5qdaz8-gcc-5.5.0-lib cwmia787gmr4pypna6na1nfirql=
r8y0p-gcc-5.5.0 fbclk7l7fn4qh6nwi1xl1wbszhhj6yfd-libatomic-ops-7.6.2\nFileS=
ize: 543891\nSystem: x86_64-linux\nDeriver: 9c7ilc15k8p5b84lxhgn2jy6l6xgbdp=
j-libgc-7.6.4.drv\nSignature: 1;berlin.guixsd.org;KHNpZ25hdHVyZSAKIChkYXRhI=
AogIChmbGFncyByZmM2OTc5KQogIChoYXNoIHNoYTI1NiAjRTBGRUExNkQ5ODU5Mjk1QjQ4N0Iw=
OTc2RTVFRkIxNDUzRTdCOUVFNkJBNUFBRkY5NUFEQTg1REY5QUJENkI4QSMpCiAgKQogKHNpZy1=
2YWwgCiAgKGVjZHNhIAogICAociAjMDY0MkZCQUYwRDExNDM2NTc3NUY1QTI2REU3NDYyOTMyQz=
g5RjhCM0U4RDg5MzQ4MzRBNTQwRDAwMEVBQTk5QiMpCiAgIChzICMwMzQ1RUFCMDM1MzBEMzRFO=
TEwNzVFMzFFMUFENjM4OEI3NDAwRTQxRjRBOTExRjg0RDE0NEQ3M0QxMkVCMzY5IykKICAgKQog=
ICkKIChwdWJsaWMta2V5IAogIChlY2MgCiAgIChjdXJ2ZSBFZDI1NTE5KQogICAocSAjOEQxNTZ=
GMjk1RDI0QjBEOUE4NkZBNTc0MUE4NDBGRjJEMjRGNjBGN0I2QzQxMzQ4MTRBRDU1NjI1OTcxQj=
M5NCMpCiAgICkKICApCiApCg=3D=3D\n"))
>
> =E2=80=A6 and the daemon went on to substitute libgc-7.6.4-debug.
>
> This apparently has to do with multiple-output derivations where not all
> of the outputs are substitutable.  The loop could come from
> SubstitutionGoal::tryNext, which recurses:
>
>     SubstitutablePathInfos infos;
>     PathSet dummy(singleton<PathSet>(storePath));
>     worker.store.querySubstitutablePathInfos(sub, dummy, infos);
>     SubstitutablePathInfos::iterator k =3D infos.find(storePath);
>     if (k =3D=3D infos.end()) { tryNext(); return; }
>     info =3D k->second;
>     hasSubstitute =3D true;

BTW, if it appears to you unrelated, what is the status of this old bug
with only one message? :-)

Cheers,
simon

Last modified: Mon, 16 Jun 2025 12:00:02 UTC

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.