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Thread: Causes for perpetual hash fails?

  1. #1
    Intr4ns1t's Avatar Pro-antinegativist BT Rep: +4
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    So, I am curious for a technical view of what the different causes for a seeder sending not a single healthy piece of a file they are seeding would be. Many different pieces, all failing hash check, without exception. My client bans them, then they come back after the ban expires, feed me 5 or so more pieces that all fail the hash check, then get banned again. I have never seen this before in my peer lists, so I have to ask what the possible causes are, and what the probable causes are. The peer is in the same country as me and is confounding me on several files that they are only seeder on.
    Quote Originally Posted by KFlint
    Think 9 is the new 10.

  2. BitTorrent   -   #2
    Quarterquack's Avatar sprclfrglstcxpldcs BT Rep: +3
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    Happened to me once before. I'd get about 80% of a piece before the check fails and it's reset. Reported it to a staffer and they said nothing could be done about the fact that a torrent I was downloading which was 4gb large had downloaded 20+gb's (ratio woes, oh how you treat me).
    Ellipses go here.

  3. BitTorrent   -   #3
    Happens most often on MP3 files. A user changes the tags on the files and saves them, while they are still seeding in their client. Their bittorrent client has no reason to suspect the files have changed. so it keeps sending pieces, unaware that they do not hash properly.

  4. BitTorrent   -   #4
    Polarbear's Avatar deep funk BT Rep: +5
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    There are many reasons why peers send bad data. It simply means that the data was not saved correctly or has been modified in some way.
    Mostly it's a faulty HD but it could be anything on the remote machine that changes the original files.
    A good client can detect those peers and ban them. I can even set specific rules when to ban peers.



    I can also choose if the ban is permanent or lifted after a certain period.

    When your client doesn't support this, it may happen that you download gigs of bad data that are all counted towards your download stats. Happened to me on HDBits some years ago.

    Now if there's only one seeder with corrupt data there's nothing you can do but ask for another seeder that has the proper files. Never happened to me to be honest.

    It's also true that you'll find more bad peers on music trackers because people manually change the files they're still seeding.

    I advice everyone to use a client that detects and bans these peers. Otherwise there may be some ratio suprises.

  5. BitTorrent   -   #5
    Quarterquack's Avatar sprclfrglstcxpldcs BT Rep: +3
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    I actually learnt something new and useful today. Thank you, cbb/Polarbear. I could never explain why this happened before or what would cause it, but now I know the why and how, thanks to you two.
    Ellipses go here.

  6. BitTorrent   -   #6
    Intr4ns1t's Avatar Pro-antinegativist BT Rep: +4
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    Quote Originally Posted by Darth Rings View Post


    I actually learnt something new and useful today. Thank you, cbb/Polarbear. I could never explain why this happened before or what would cause it, but now I know the why and how, thanks to you two.
    I second that, and chrisbeebops post specifically, as I am sure that is exactly what is wrong. I have never been a big audiophile, so I am not terribly in tune with mp3 tracks, but seeing as these are all audio, it fits the scenario perfectly.
    Quote Originally Posted by KFlint
    Think 9 is the new 10.

  7. BitTorrent   -   #7
    Besides what the guys above said (which is a pretty thorough explanation), it could also happen that the problem is in your side. This is less likely, but if you have a faulty RAM stick or hard drive or even a malfunctioning router you can also get hashfails, and I've seen it happen.

    uTorrent also has settings like the ones Polarbear posted a screen of, although less intuitive - they're found under "Advanced Settings", but that's nothing a quick look at the help file can't help you with.
    "Come visit sometime, okay? We'll always be here for you. We... we all love you."

  8. BitTorrent   -   #8
    Intr4ns1t's Avatar Pro-antinegativist BT Rep: +4
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    Quote Originally Posted by anon-sbi View Post
    Besides what the guys above said (which is a pretty thorough explanation), it could also happen that the problem is in your side. This is less likely, but if you have a faulty RAM stick or hard drive or even a malfunctioning router you can also get hashfails, and I've seen it happen.

    uTorrent also has settings like the ones Polarbear posted a screen of, although less intuitive - they're found under "Advanced Settings", but that's nothing a quick look at the help file can't help you with.
    Yeah, I already had it set to ban, but not for long enough, and wouldn't have been bothered if they weren't the only seeder. I know it's not on my end, as all the failed pieces were from the same peer, and due to ipv6, they were connecting and getting banned multiple times, on multiple torrents, so I know the prob was on their end. Log files ftw.(sort of) I was more curious about the why, and would rather ask than assume to know I can now guess that it's either someone who routinely renames files, or someone with a dying drive, though the renaming seems much more likely in this instance.
    Quote Originally Posted by KFlint
    Think 9 is the new 10.

  9. BitTorrent   -   #9
    Polarbear's Avatar deep funk BT Rep: +5
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    You can rename files and seed them, that's fine. With Azureus you can even move them to different folders. Tagging is what changes them. All you need to do is open a mp3 you're still seeding with iTunes. With the wrong settings it'll change the tags.

  10. BitTorrent   -   #10
    Intr4ns1t's Avatar Pro-antinegativist BT Rep: +4
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    Quote Originally Posted by Polarbear View Post
    You can rename files and seed them, that's fine. With Azureus you can even move them to different folders. Tagging is what changes them. All you need to do is open a mp3 you're still seeding with iTunes. With the wrong settings it'll change the tags.
    Hmm... Interesting. Thanks for the clarification, I don't use itunes, so I don't have much exposure to those types of issues.
    Quote Originally Posted by KFlint
    Think 9 is the new 10.

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