Bug#695169: linux-image-3.6-trunk-amd64: soft lockup in b43 under load
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Hi,
> > BUG: soft lockup - CPU#0 stuck for 22s! [irq-17:0002]
>
> Please send the log messages that appear immediately after this.
There are no messages after this. The I/O part of the kernel goes into a
deadlock and the system becomes unresponsible. I can move the mouse and
click around in XFCE, but opening menues and everything that would require
disk access fails and freezes the process requesting it.
> > I haven't really figured out how to reproduce it but it does lead to data loss.
> [...]
>
> I don't think we would class this as 'data loss'. See
> <http://kernel-handbook.alioth.debian.org/ch-bugs.html#s9.1.2>.
As it freezes the entire I/O, there is risk of data loss. In fact, it
corrupted one of my git repositories on disk because some cached writes
didn't sync.
I tried to open a text editor and save the error message (the one I psoted
above), but I couldn't start up the editor. I then used my shell's
built-in cat to store the message in a file, the file appeared in the
filesystem, but never got written to the disk.
I could not even trigger an emergency sync via SysRq. It just didn't
happen.
Once the b43 driver goes into the freeze, the whoe kernel fails to do any
I/O.
I, personally, consider this as a risk of data loss.
- --
* mirabilos is handling my post-1990 smartphone *
<mirabilos> Aaah, it vibrates! Wherefor art thou, daemonic device??
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