Review Request 125613: Race condition and error notification loss in ListJob

[Albert Astals Cid]

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Do you think you can add an unittest for this or is it hard to recreate the conditionts?

- Albert Astals Cid


On oct. 12, 2015, 7:11 p.m., Alberto Jiménez Ruiz wrote:
> 
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> https://git.reviewboard.kde.org/r/125613/
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> (Updated oct. 12, 2015, 7:11 p.m.)
> 
> 
> Review request for kdelibs.
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> Bugs: 333436
>     http://bugs.kde.org/show_bug.cgi?id=333436
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> Repository: kdelibs
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> Description
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> Race condition and error notification loss in ListJob
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> Diffs
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>   kio/kio/job.cpp 91712e3 
>   kio/kio/jobclasses.h d771cfe 
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> Diff: https://git.reviewboard.kde.org/r/125613/diff/
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> 
> Testing
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> Tests done on Kubuntu 15.10:
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> With this folder structure in ~:
> src
> ######c (Folder)
> ##############b (Folder chmod'ed to 700 and owned by root)
> #######################d (10MB file made of /dev/urandom data)
> ##############a (10MB file made of /dev/urandom data)
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> Then, (as a normal user execute: "kioclient ~/src ~/dst")
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> Expected result: Notification that some files were not able to be copied (Cannot access "b" folder)
> Result with latest kdelibs: Silent copying where b folder is owned by user but nothing inside.
> ---When all kdebugdialog flags are set, a backtrace is also seen.
>       
> subError notifications for listjob subjobs are lost, Copyjob uses this signal to skip data.
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> Also, this fix prevents a race condition. 
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> ListJob has another ListJob as a subjob.
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> Chaild fails for whatever reason and calls error, which calls slotError, which calls slotsFinished and emitResult.
> The result of the child gets collected by parent. slotResult of parent gets called, removes subjob and emitsresult because there are no subjobs left.
> ---That's fine as long as the slave associated with the parent emits finished before the child fails. If it doesn't, parent calls emitsResult twice.
> 
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> Result after patch: kioclient shows a MessageBox telling the copy operation could not be completed.
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> 
> Thanks,
> 
> Alberto Jiménez Ruiz
> 
>

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