svn commit: r269127 - head/sys/dev/usb/wlan

[Hans Petter Selasky]

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

#0  doadump (textdump=<value optimized out>) at pcpu.h:235
235	pcpu.h: No such file or directory.
	in pcpu.h
(kgdb) #0  doadump (textdump=<value optimized out>) at pcpu.h:235
#1  0xffffffff808eae86 in kern_reboot (howto=260)
     at /usr/img/freebsd.9/sys/kern/kern_shutdown.c:454
#2  0xffffffff808eb387 in panic (fmt=0x1 <Address 0x1 out of bounds>)
     at /usr/img/freebsd.9/sys/kern/kern_shutdown.c:642
#3  0xffffffff80cd2c30 in trap_fatal (frame=0x12, eva=<value optimized out>)
     at /usr/img/freebsd.9/sys/amd64/amd64/trap.c:878
#4  0xffffffff80cd3480 in trap (frame=0xffffff8000304fe0)
     at /usr/img/freebsd.9/sys/amd64/amd64/trap.c:598
#5  0xffffffff80cbc783 in calltrap ()
     at /usr/img/freebsd.9/sys/amd64/amd64/exception.S:232
#6  0xffffffff807826cf in ural_setup_tx_desc (sc=<value optimized out>,
     desc=0xfffffe0002c2a500, flags=<value optimized out>,
     len=<value optimized out>, rate=0)
     at /usr/img/freebsd.9/sys/dev/usb/wlan/if_ural.c:1040
#7  0xffffffff80783d90 in ural_start (ifp=0xfffffe0005a64800)
     at /usr/img/freebsd.9/sys/dev/usb/wlan/if_ural.c:1335
#8  0xffffffff809aa2ea in if_transmit (ifp=0xfffffe0005a64800,
     m=<value optimized out>) at /usr/img/freebsd.9/sys/net/if.c:3395
#9  0xffffffff809ef7b2 in ieee80211_start (ifp=0xfffffe00054f2800)
     at /usr/img/freebsd.9/sys/net80211/ieee80211_output.c:365
#10 0xffffffff809aa2ea in if_transmit (ifp=0xfffffe00054f2800,
     m=<value optimized out>) at /usr/img/freebsd.9/sys/net/if.c:3395
#11 0xffffffff809ae8b3 in ether_output_frame (ifp=0xfffffe00054f2800,
     m=0xfffffe014400a200) at /usr/img/freebsd.9/sys/net/if_ethersubr.c:447
#12 0xffffffff809aee30 in ether_output (ifp=0xfffffe00054f2800,
     m=0xfffffe014400a200, dst=<value optimized out>, ro=<value 
optimized out>)
     at /usr/img/freebsd.9/sys/net/if_ethersubr.c:418
#13 0xffffffff80a186b4 in ip_output (m=0xfffffe014400a200,
     opt=<value optimized out>, ro=0xffffff8000305480,
     flags=<value optimized out>, imo=0x0, inp=0xfffffe0005911498)
     at /usr/img/freebsd.9/sys/netinet/ip_output.c:631
#14 0xffffffff80a87d2a in tcp_output (tp=0xfffffe0005908b70)
     at /usr/img/freebsd.9/sys/netinet/tcp_output.c:1281
#15 0xffffffff80a82222 in tcp_do_segment (m=0xfffffe0005701700,
     th=0xfffffe0144913338, so=0xfffffe01449132a8, tp=0xfffffe0005908b70,
     drop_hdrlen=52, tlen=1424, iptos=0 '\0', ti_locked=1)
     at /usr/img/freebsd.9/sys/netinet/tcp_input.c:1860
#16 0xffffffff80a85219 in tcp_input (m=0xfffffe0005701700,
     off0=<value optimized out>)
     at /usr/img/freebsd.9/sys/netinet/tcp_input.c:1410
#17 0xffffffff80a155fa in ip_input (m=0xfffffe0005701700)
     at /usr/img/freebsd.9/sys/netinet/ip_input.c:760
#18 0xffffffff809b7808 in netisr_dispatch_src (proto=1,
     source=<value optimized out>, m=<value optimized out>)
     at /usr/img/freebsd.9/sys/net/netisr.c:1013
#19 0xffffffff809ae3fd in ether_demux (ifp=0xfffffe00054f2800,
     m=0xfffffe0005701700) at /usr/img/freebsd.9/sys/net/if_ethersubr.c:943
#20 0xffffffff809ae6de in ether_nh_input (m=<value optimized out>)
     at /usr/img/freebsd.9/sys/net/if_ethersubr.c:762
#21 0xffffffff809b7808 in netisr_dispatch_src (proto=9,
     source=<value optimized out>, m=<value optimized out>)
     at /usr/img/freebsd.9/sys/net/netisr.c:1013
#22 0xffffffff809fdf7d in sta_input (ni=0xffffff8001f5d000,
     m=0xfffffe0005701700, rssi=73, nf=-95)
     at /usr/img/freebsd.9/sys/net80211/ieee80211_sta.c:827
#23 0xffffffff8078582d in ural_bulk_read_callback (xfer=0xffffff8001f56a00,
     error=<value optimized out>)
     at /usr/img/freebsd.9/sys/dev/usb/wlan/if_ural.c:968
#24 0xffffffff8075d9c4 in usbd_callback_wrapper (pq=<value optimized out>)
     at /usr/img/freebsd.9/sys/dev/usb/usb_transfer.c:2270
#25 0xffffffff8075b8d6 in usb_command_wrapper (pq=0xffffff8001f56060,
     xfer=<value optimized out>)
     at /usr/img/freebsd.9/sys/dev/usb/usb_transfer.c:2921
#26 0xffffffff8075e160 in usb_callback_proc (_pm=<value optimized out>)
     at /usr/img/freebsd.9/sys/dev/usb/usb_transfer.c:2135
#27 0xffffffff80758653 in usb_process (arg=<value optimized out>)
     at /usr/img/freebsd.9/sys/dev/usb/usb_process.c:169
#28 0xffffffff808b934f in fork_exit (
     callout=0xffffffff80758580 <usb_process>, arg=0xffffff80008a91f0,
     frame=0xffffff8000305b00) at 
/usr/img/freebsd.9/sys/kern/kern_fork.c:996
#29 0xffffffff80cbccae in fork_trampoline ()
     at /usr/img/freebsd.9/sys/amd64/amd64/exception.S:606

--HPS