Re: Panic in ieee80211 tx mgmt timeout

On Wednesday, June 29, 2011 03:50:08 Adrian Chadd wrote:
> This is kinda strange; that symbol doesn't exist in the net80211 or ath source.
> 
> What the heck?
> 
> 
> 
> adrian
> 
> 
> 
> On 28 June 2011 17:28, Stefan Esser <st_esser_at_t-online.de> wrote:
> > Hi,
> >
> > is this a known issue?
> >
> > My -CURRENT system (r223560M, amd64, 8GB, Atheros WLAN) panics after
> > minutes to hours of uptime with the following message:
> >
> > Fatal trap 12: page fault while in kernel mode
> > cpuid = 0; apic id = 0
> > fault virtual address   = 0xffffff807f502000
> > fault code              = supervisor data read, page not present
> > ...
> > processor eflags        = interrupt enabled, resume, IOPL = 0
> > current process         = 11 (swi4: clock)
> > [ thread pid 11 tid 1000012 ]
> > Stopped at      ieee80211_tx_mgmt_timeout+0x1:  movq     (%rdi),%rdi
> >
> > db> bt
> > Tracing pid 11 tid 100012 td 0xfffffe00032e0000
> > ieee80211_tx_mgmt_timeout() at ieee80211_tx_mgmt_timeout+0x1
> > intr_event_execute_handlers() at intr_event_execute_handlers+0x66
> > ithread_loop() at ithread_loop+0x96
> > fork_exit() at fork_exit+0x11d
> > fork_trampoline() at fork_trampoline+0xe
> > --- trap 0, rip = 0, rsp = 0xffffff8000288d00, rbp = 0 ---
> >
> > This panic message is manually transcribed, since the GPT-only
> > partitioning prevents dumping of a kernel core. (Why, BTW?)
> > I could add a swap partition on a MBR disk, if a core dump seems
> > neccessary to diagnose the problem. I'm also willing to wait for that
> > panic to occur again and to gather more debug output.
> >
> >
> > Other information: The Atheros WLAN in this system is unused (not
> > associated) but both ath0 and wlan0 were "UP" at the time of the panic.
> >
> > Initial testing shows the system to be stable with both wlan0 and ath0
> > set to "down" after boot. But still, the timeout should not panic the
> > kernel, if WLAN is active but not fully configured (e.g. no SSID).
> >
> > Any ideas?

It's name is ieee80211_tx_mgt_timeout used to track AUTH/ASSOC
requests. Afaik there is even a similar PR about that.

Adrian, you've got a AP set up to drop either a AUTH or ASSOC
response frame?

-- 
Bernhard