GNU bug report logs - #34006
Guix gc killed live roots - broke git

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: swedebugia <at> riseup.net
Subject: bug#34006: closed (Re: bug#34006: Guix gc killed live roots -
 broke git)
Date: Sat, 12 Jan 2019 19:03:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#34006: Guix gc killed live roots - broke git

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 34006 <at> debbugs.gnu.org.

-- 
34006: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=34006
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: swedebugia <at> riseup.net
To: Mark H Weaver <mhw <at> netris.org>
Cc: Ricardo Wurmus <rekado <at> elephly.net>, 34006-done <at> debbugs.gnu.org
Subject: Re: bug#34006: Guix gc killed live roots - broke git
Date: Sat, 12 Jan 2019 11:02:16 -0800

On 2019-01-08 07:50, Mark H Weaver wrote:
> Hi,
> 
> swedebugia <swedebugia <at> riseup.net> writes:
> 
>> On 2019-01-07 12:31, Ricardo Wurmus wrote:
>>>
>>>> $ git pull swedebugia
>>>> fatal: unable to fork
>>>>
>>>> Stracing it reveals that it is missing something (see full attached):
>>>
>>> Where do you see that?
>>
>> Ah, sorry the full command was:
>> strace git pull swedebugia
> 
> I looked at the strace output you provided, and didn't find any evidence
> of a missing file, which I doubt would lead to the error message "unable
> to fork" anyway.  The short excerpt that you quoted in your earlier mail
> showed the failure to find "/etc/ld.so.preload", but that's expected,
> and does not indicate a problem.  The problem might be happening in the
> child process (/home/sdb/.guix-profile/libexec/git-core/git), so adding
> the -f option to strace, i.e. "strace -f git pull swedebugia", might
> yield more useful information.
> 
> If I'm not mistaken, "unable to fork" more likely indicates a lack of
> available resources, possibly due to configured resource limits (see
> ulimit(3) and the 'ulimit' bash builtin, e.g. try "ulimit -a").
> Otherwise, I guess it could be due to restrictions imposed by the use of
> a security framework.

Tried again with "strace -f" and got this:

stat("/home/sdb/.guix-profile/libexec/git-core/ssh", 0x7ffe26617620) =
-1 ENOENT (No such file or directory)
stat("/gnu/store/6ff29rxibnfzabp17qj3mzpc8jggrmsn-profile/bin/ssh",
0x7ffe26617620) = -1 ENOENT (No such file or directory)
stat("/gnu/store/6ff29rxibnfzabp17qj3mzpc8jggrmsn-profile/sbin/ssh",
0x7ffe26617620) = -1 ENOENT (No such file or directory)
stat("/home/sdb/.local/bin;/home/sdb/.guix-profile/bin/ssh",
0x7ffe26617620) = -1 ENOENT (No such file or directory)
stat("/home/sdb/.guix-profile/sbin/ssh", 0x7ffe26617620) = -1 ENOENT (No
such file or directory)
stat("/run/setuid-programs/ssh", 0x7ffe26617620) = -1 ENOENT (No such
file or directory)
stat("/home/sdb/.config/guix/current/bin/ssh", 0x7ffe26617620) = -1
ENOENT (No such file or directory)
stat("/home/sdb/.guix-profile/bin/ssh", 0x7ffe26617620) = -1 ENOENT (No
such file or directory)
stat("/home/sdb/.guix-profile/sbin/ssh", 0x7ffe26617620) = -1 ENOENT (No
such file or directory)
stat("/run/current-system/profile/bin/ssh", 0x7ffe26617620) = -1 ENOENT
(No such file or directory)
stat("/run/current-system/profile/sbin/ssh", 0x7ffe26617620) = -1 ENOENT
(No such file or directory)
close(14)                               = 0

So installing ssh might be a good idea >D

Solved! :D

-- 
Cheers 
Swedebugia

[Message part 3 (message/rfc822, inline)]

From: swedebugia <at> riseup.net
To: bug-guix <at> gnu.org
Subject: Guix gc killed live roots - broke git
Date: Mon, 07 Jan 2019 02:07:42 -0800

[Message part 4 (text/plain, inline)]

Hi

Yesterday I hacked on guix. Everything was fine. Store was 43G.
I ran guix gc to clean up.

Afterwards git broke:

$ git pull swedebugia 
fatal: unable to fork

Stracing it reveals that it is missing something (see full attached):
execve("/home/sdb/.guix-profile/bin/git", ["git", "pull", "swedebugia"],
0x7ffe05bad790 /* 66 vars */) = 0
brk(NULL)                               = 0xbfe000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7f61627a1000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or
directory)
...

$ which git
/home/sdb/.guix-profile/bin/git
$ guix --version
guix (GNU Guix) 0.16.0 <- vanilla 0.16 initted from the installer

$ guix package -l|grep -5 git
Generation 1	Dec 24 2018 07:36:14
 
emacs-paredit	24	out	/gnu/store/1zha5anxg029qfl7r569aap5lfyrb66a-emacs-paredit-24
 
emacs-no-x	26.1	out	/gnu/store/9v7m3c83rm1rgi99ph5xdkpnnd0c62x4-emacs-no-x-26.1
 
setxkbmap	1.3.1	out	/gnu/store/3px1119mhx9q7xzmi5jlg5wylhkx84cr-setxkbmap-1.3.1
  git	2.19.2	out	/gnu/store/iffgahfxnk13narndlaqf9xm0yhyhyyv-git-2.19.2

Is this a bug?

If yes I think it is serious.

-- 
Cheers 
Swedebugia

[strace-git.txt (text/plain, attachment)]

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