Re: [Bugme-new] [Bug 33842] New: NULL pointer dereference in ip_fragment

(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Sat, 23 Apr 2011 07:51:56 GMT bugzilla-daemon@bugzilla.kernel.org wrote:

https://bugzilla.kernel.org/show_bug.cgi?id=33842

           Summary: NULL pointer dereference in ip_fragment

oops in ip_defragment().  Kernel is 2.6.39-rc4.  There are some
screenshots attached to the report.

           Product: Networking
           Version: 2.5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
        AssignedTo: acme@ghostprotocols.net
        ReportedBy: tom@dbservice.com
        Regression: No


The host is using the ath9k driver. eth0+wlan0 are bridged. Shortly after I
start using the wireless network with my macbook, the bug triggers. No idea if
it's wireless related, because there's also a rtl8169_rx_interrupt entry in the
stacktrace.

This is a transcript, since I don't (have/know of) any way to get the backtrace
out of a crashed box.

IP: ip_fragment+0x52/0x840
Call Trace:
  <IRQ>
  br_parse_ip_options
  br_flood_deliver
  br_parse_ip_options
  br_nf_dev_queue_xmit
  br_nf_post_routing
  nf_iterate

then also:
  lots of br_flood_deliver
  lots of br_*_finish
  one ? rtl8169_interrupt
  one ? ath9k_ioread32