On 07/27/14 02:10, Adrian Chadd wrote:
On 26 July 2014 12:13, Hans Petter Selasky <h...@selasky.org> wrote:
On 07/26/14 20:36, Adrian Chadd wrote:
Hi,
We should likely review how the PLCP bits are being used and why it's
getting a rate of 0 in the first place.
So, why's it getting a rate of 0 passed into the transmit path?
Hi Adrian,
Here is the backtrace of the panic:
Fatal trap 18: integer divide fault while in kernel mode
cpuid = 2; apic id = 02
instruction pointer = 0x20:0xffffffff807826cf
stack pointer = 0x28:0xffffff8000305090
frame pointer = 0x28:0xffffff80003050a0
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 15 (usbus0)
trap number = 18
panic: integer divide fault
cpuid = 2
KDB: stack backtrace:
#0 0xffffffff809257e6 at kdb_backtrace+0x66
#1 0xffffffff808eb3ae at panic+0x1ce
#2 0xffffffff80cd2c30 at trap_fatal+0x290
#3 0xffffffff80cd3480 at trap+0x250
#4 0xffffffff80cbc783 at calltrap+0x8
#5 0xffffffff80783d90 at ural_start+0x1d0
#6 0xffffffff809aa2ea at if_transmit+0xea
#7 0xffffffff809ef7b2 at ieee80211_start+0x542
#8 0xffffffff809aa2ea at if_transmit+0xea
#9 0xffffffff809ae8b3 at ether_output_frame+0x33
#10 0xffffffff809aee30 at ether_output+0x530
#11 0xffffffff80a186b4 at ip_output+0xd74
#12 0xffffffff80a87d2a at tcp_output+0xfea
#13 0xffffffff80a82222 at tcp_do_segment+0xc02
#14 0xffffffff80a85219 at tcp_input+0xa29
#15 0xffffffff80a155fa at ip_input+0xaa
#16 0xffffffff809b7808 at netisr_dispatch_src+0x218
#17 0xffffffff809ae3fd at ether_demux+0x14d
Hm, so at some point that rate was not assigned to something. Can you
trace the ural_start path to see where it's supposed to be calculating
the rate?
Rate comes from this:
tp = &vap->iv_txparms[ieee80211_chan2mode(ni->ni_chan)];
if (IEEE80211_IS_MULTICAST(wh->i_addr1))
rate = tp->mcastrate;
else if (tp->ucastrate != IEEE80211_FIXED_RATE_NONE)
rate = tp->ucastrate;
else
rate = ni->ni_txrate;
--HPS
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