linux-ext4 - [Bug 89131] New: Hangs when checking torrent through libtorrent; kernel BUG at mm/iov

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Date:	Mon, 01 Dec 2014 13:19:19 +0000
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 89131] New: Hangs when checking torrent through libtorrent;
 kernel BUG at mm/iov_iter.c:219!

https://bugzilla.kernel.org/show_bug.cgi?id=89131

            Bug ID: 89131
           Summary: Hangs when checking torrent through libtorrent; kernel
                    BUG at mm/iov_iter.c:219!
           Product: File System
           Version: 2.5
    Kernel Version: 3.17.3
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: ext4
          Assignee: fs_ext4@...nel-bugs.osdl.org
          Reporter: kokoko3k@...il.com
        Regression: No

Created attachment 159351
  --> https://bugzilla.kernel.org/attachment.cgi?id=159351&action=edit
Backtraces from both the systems

When i use qbittorrent (libtorrent) by explicitely disable the os cache and do
the hash-check on a specific torrent data (it does not happen on all of the
torrents), linux hangs leaving me no choice but to reboot somehow.

I managed to get two backtraces from completely different systems (an e7300
desktop and an ivybridge laptop), they're attached.

As a reference, i started to talk about the issue here:
https://github.com/qbittorrent/qBittorrent/issues/2200#issuecomment-64951598

...seems the issue is given by the use of the O_DIRECT flag

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