Re: Possible race condition with git-rebase + .git/index.lock

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On Tuesday, March 12 2019, Elijah Newren wrote:

> On Tue, Mar 12, 2019 at 12:32 PM Sergio Durigan Junior
> <sergiodj@xxxxxxxxxxxx> wrote:
>>
>> On Tuesday, March 12 2019, Elijah Newren wrote:
>>
>> > On Tue, Mar 12, 2019 at 9:48 AM Sergio Durigan Junior
>> > <sergiodj@xxxxxxxxxxxx> wrote:
>> >> On Tuesday, March 12 2019, Duy Nguyen wrote:
>> >>
>> >> > On Tue, Mar 12, 2019 at 5:18 AM Sergio Durigan Junior
>> >> > <sergiodj@xxxxxxxxxxxx> wrote:
>> >> >> This works without problems most of the time (well, usually there are
>> >> >> conflicts and all, but that's a burden I have to carry).  However,
>> >> >> sometimes I notice that git fails with:
>> >> >>
>> >> >>   # git rebase origin/master
>> >> >>   ...
>> >> >>   Applying: commitX
>> >> >>   Applying: commitY
>> >> >>   Applying: commitZ
>> >> >>   fatal: Unable to create '/home/xyz/dir1/dir2/.git/index.lock': File exists.
>> >> >>
>> >> >> The first thing I did was to check whether the index.lock file existed,
>> >> >> but it doesn't.
>> >> >
>> >> > Is the output this clean? What I'm looking for is signs of automatic
>> >> > garbage collection kicking in the middle of the rebase. Something like
>> >> > "Auto packing the repository blah blah for optimum performance".
>> >>
>> >> Yeah, this is the exact output.  I also thought about "git gc", but I
>> >> don't see any output related to it.  Is it possible that it's being
>> >> executed in the background and not printing anything?
>> >
>> > Any chance you have a cronjob or other task execution mechanism that
>> > is running git commands in various directories (even simple commands
>> > like 'git status' since it's not read-only contrary to what some
>> > expect, or 'git fetch' which might trigger a background gc)?
>>
>> Nope, nothing like this.  AFAIK, nothing is touching that repository at
>> the same time that I am.  Besides, even if I wait some minutes before
>> trying again, the bug manifests again.
>
> Well, even though you didn't see the output Duy was looking for, if
> you set gc.auto to 0 and gc.autoPackLimit to 0 (and maybe
> gc.autoDetach to false just for good measure), does the problem still
> occur?

Thanks, I was indeed going to try this.  I'll test when I have time, and
will let you know.

-- 
Sergio
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