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Not a bug: compute derivation: null bytes, hardware issue, how to recove


From: André Batista
Subject: Not a bug: compute derivation: null bytes, hardware issue, how to recover #41362
Date: Sun, 28 Feb 2021 22:54:22 -0300

Hello Guix,

This is not a request for help, but just for reference, so you may skip it.

Recently I fell pray to a hardware issue which rendered one of my guix
machines stuck and unable to upgrade. Issue #41362 seems related and user
also confirmed a hardware issue. Nonetheless, after solving the imediate
hardware problem I was stuck with a system which would refuse to pull
newer generations.

I first tried to roll-back guix pull, system and package to no avail.
I've tried time-machine as well and it did not help. I've also tried a
'--bootstrap' guile flag when pulling and got an unrelated issue. I was
about to bust the system and reinstall when guix gc came to rescue.

The procedure was simple enough but it took me some time to figure: switch
guix pull to last good generation; delete the one where the corruption
started; garbage collect everything; pull again.

Ref: https://issues.guix.gnu.org/41362

----

Updating channel 'guix' from Git repository at 
'https://git.savannah.gnu.org/git/guix.git'...
Authenticating channel 'guix', commits 9edb3f6 to 337cb4a (31 new commits)...

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Building from this channel:
  guix      https://git.savannah.gnu.org/git/guix.git   337cb4a
substitute: 
substitute: updating substitutes from 'https://ci.guix.gnu.org'...   0.0%
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
substitute: 
substitute: updating substitutes from 'https://ci.guix.gnu.org'...   0.0%
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
substitute: 
substitute: updating substitutes from 'https://ci.guix.gnu.org'...   0.0%
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
downloading from 
https://ci.guix.gnu.org/nar/lzip/818xvny8yl4lqba1hsh1pq7gzrpdcbqn-module-import 
...

 module-import  2KiB                   15KiB/s 00:00 [##################] 
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 module-import  2KiB                   11KiB/s 00:00 [##################] 
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downloading from 
https://ci.guix.gnu.org/nar/lzip/i2cwrk8amgms88p1vgw8z9qxzwgyj9d8-module-import-compiled
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downloading from 
https://ci.guix.gnu.org/nar/gzip/h1gwz8klgy95wlr3a4398jl8aijwy35b-compute-guix-derivation
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Computing Guix derivation for 'x86_64-linux'...  Backtrace:
In ice-9/boot-9.scm:
   3380:4 19 (define-module* _ #:filename _ #:pure _ #:version _ #:imports _ 
#:exports _ #:replacements _ # _ # _ # _ ?)
  3393:24 18 (_)
   222:29 17 (map1 _)
   222:29 16 (map1 _)
   222:29 15 (map1 _)
   222:29 14 (map1 _)
   222:29 13 (map1 _)
   222:29 12 (map1 _)
   222:29 11 (map1 _)
   222:17 10 (map1 (((gnu packages check)) ((gnu packages docbook)) ((gnu 
packages emacs)) ((gnu packages hurd)) # ?))
  3297:17  9 (resolve-interface (gnu packages check) #:select _ #:hide _ 
#:prefix _ #:renamer _ #:version _)
In ice-9/threads.scm:
    390:8  8 (_ _)
In ice-9/boot-9.scm:
  3223:13  7 (_)
In ice-9/threads.scm:
    390:8  6 (_ _)
In ice-9/boot-9.scm:
  3507:20  5 (_)
   2806:4  4 (save-module-excursion _)
  3527:26  3 (_)
In unknown file:
           2 (primitive-load-path "gnu/packages/check" #<procedure 7efec272a9a0 
at ice-9/boot-9.scm:3514:37 ()>)
In ice-9/eval.scm:
   223:20  1 (proc #<module (#{ g129}#) 7efec1290500>)
In unknown file:
           0 (%resolve-variable (7 . #) #<module (#{ g129}#) 7efec1290500>)

ERROR: In procedure %resolve-variable:
error: #{\x0;\x0;\x0;----[cut some KB]-----\x0;\x0;}#: unbound variable
guix pull: error: You found a bug: the program 
'/gnu/store/h1gwz8klgy95wlr3a4398jl8aijwy35b-compute-guix-derivation'
failed to compute the derivation for Guix (version: 
"337cb4a0481ed08b672cc70d601d1b60f2edcebd"; system: "x86_64-linux";
host version: "022d90cd9e1ac145fddb7fe81c8d5f6cf11c4584"; pull-version: 1).
Please report it by email to <bug-guix@gnu.org>.


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