RE: kernel BUG in iwl-agn-rs.c:2076,was: iwlagn + some accesspoint = hardlock

[lkml@Think-Future.de]

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  Hi,

  In addition to the previous message it seems that:

  - RFKILL switch, switching radio on, (obviously) is a precondition. But then, it only 
    happens shortly after switching radio on,
  - it happens more frequently and faster after switching radio on when kde + firefox + xy is running

Please find attached an image of the bug. Finally I could catch a glimpse of what happens, I longued
for this quite some time.

Strangely, as stated in the previous message, this bug does only happen in conjunction at a specific 
geographical position, so far it only happened there that is. How does this correlate with the designated
code at line 2076 in iwl-agn-rs.c?:

  /* Sanity-check TPT calculations */
  BUG_ON(window->average_tpt != ((window->success_ratio *
      tbl->expected_tpt[index] + 64) / 128));


Furthermore, it seems like there was already an encounter with this bug before. Previously I had no means 
of grabbing more information off it, though, so I wrote down some notes:

2010-03-20: iwl-agn-rs.c line 2076: bug
The file where I kept my note for this bug contains: 

- crashed during wireless AP scan using wpa_supplicant (after RFKILL switching to on..)
- this happend right after a fresh reboot (after crashing for the same bug)

- afterwards, auth.log contained this (bad, bad where's my data gone?):
Mar 20 18:24:01 localhost CRON[16684]: pam_unix(cron:session): session closed for user root
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@i686; it; rv:1.9.2.1) Gecko/20091211 Firefox/3.5.6 (like Firefox/3.5.11; Debian-3.5.11-1)"

Noticed the line in the bug from 2010-03-20? Yep, the same as in the one of today.

Happy to serve with more info if required (and available..).

  Regards,



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