Kernel Panic on 2.6.28-omap1 or 2.6.29-omap1

Live forum:


15-04-2009 18:34:05


I bought a Rev.C beagleboard [bb] (http// and compiled an open embedded kernel.
This is not the vanilla 2.6 kernel, I know. There are some patches for the TI OMAP platform applied, but the wireless driver code should not be patched at all.

There is a rt73 based WLAN stick (dlink dwl-g122, HW-rev. C1 ) plugged
in on an usb hub which is connected to the EHCI port on the bb (This
hardware is for a bb based mobile robot).

Finally i got the WLAN with the rt73usb driver working with WPA and
wpa_supplicant (ping ok ). I tried to transfer a "big" file (some MB's)
with scp from my workstation to the bb's tmp directory. After some
seconds (I did some dmesg and pings over the serial console in parallel) the
kernel crashed. I also tried a 2.6.29 kernel (bitbake -p linux- -> This also crashed.

Attached please see the output from the kernel for 2.6.28 and 2.6.29... I
hope somebody can help or point out for any workaround. Please just ask
if more informations should be provided.

I'm a little bit hopeless because the legacy driver rt73.ko (CVS-Code) also didn't work reliable. I cross compiled this driver for arm
with the omap-cross compiler. I also got it to work with WPA-PSK. But the IP connection died after some time.
Data transfer just stopped and ping didn't work anymore (iwlist wlan0 scanning still gave output %-)

I don't know what to do. Please help.

Now the kernel output


Unable to handle kernel paging request at virtual address b7400000
pgd = c0004000
[b7400000] *pgd=00000000
Internal error Oops 5 [#1]
Modules linked in
CPU 0 Not tainted (2.6.28-omap1 #4)
PC is at skb_release_data+0xa0/0xc4
LR is at __kfree_skb+0x20/0xb8
pc [<c0330f64>] lr [<c0330c30>] psr a0000113
sp c051bd28 ip c051bd48 fp c051bd44
r10 00000000 r9 cf9f41c0 r8 cfbd8032
r7 00000002 r6 00000000 r5 cfbd2160 r4 cfbd2160
r3 00000000 r2 cfbd89c0 r1 000000b4 r0 b7400000
Flags NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel
Control 10c5387d Table 8edc4018 DAC 00000017
Process swapper (pid 0, stack limit = 0xc051a2e8)
Stack (0xc051bd28 to 0xc051c000)
bd20 c0330ac0 cfbd2160 cf9f4884 00000000
c051bd5c c051bd48
bd40 c0330c30 c0330ed0 00000000 cfbd8036 c051bd6c c051bd60
c0330d10 c0330c1c
bd60 c051bdfc c051bd70 c03dcfa0 c0330cd4 cfa75260 00000000
c051bd94 c051bd88
bd80 cfbd803c cf9f4884 cfbd2160 cfbd8038 cfbd803a cfbd8036
cfbd2160 00000000
bda0 cf9f41c0 00000000 00000000 00000000 c051be48 cf9c1180
00000000 00000002
bdc0 00000000 0000000e 00000000 00000000 c051be24 00000018
cfbd8032 c051be48
bde0 00000000 00000000 c051be48 cf9f41c0 c051be44 c051be00
c03dd7c4 c03dc9bc
be00 c051be24 c051be10 c006e0f8 00000000 cf9c1180 cfbd2160
00003d22 cfbd2160
be20 cf9f41c0 c051be48 cf9f42a0 cf9f4294 00000000 0000000a
c051be94 c051be48
be40 c03cd698 c03dd288 00000000 00000000 00000000 0000096c
ffffffc6 00000000
be60 0000003b 00000001 00000000 00000000 c051beb4 00000000
c055e560 c055e604
be80 00000000 c055e5f0 c051beb4 c051be98 c00692ac c03cd618
00000100 00000014
bea0 c051a000 00000001 c051beec c051beb8 c00698c0 c0069240
cf9db660 00000000
bec0 c051beec 0000004d 00000000 c051e0e4 c003ae4c c05573c8
411fc083 0000001f
bee0 c051bf04 c051bef0 c00699a4 c0069868 0000004d 0000004d
c051bf1c c051bf08
bf00 c003906c c0069968 ffffffff d8200000 c051bf8c c051bf20
c0039a30 c003900c
bf20 32fa4e8b a0000013 009959d0 00000000 c0045054 c051a000
c051e0e4 c003ae4c
bf40 c05573c8 411fc083 0000001f c051bf8c c051bf90 c051bf68
c003ae1c c0045150
bf60 60000013 ffffffff c0045054 c051a000 c051e0e4 c003ae4c
c05573c8 0000001f
bf80 c051bfb4 c051bf90 c003ae1c c0045060 c0556f68 c056fa14
c0556f68 c002df00
bfa0 c051df78 8002c100 c051bfc4 c051bfb8 c03e97ec c003add8
c051bff4 c051bfc8
bfc0 c0008974 c03e97a4 c0008468 00000000 00000000 c002df00
00000000 10c5387d
bfe0 c0557434 c002e304 00000000 c051bff8 80008034 c0008714
00000000 00000000
[<c0330ec4>] (skb_release_data+0x0/0xc4) from [<c0330c30>]
r600000000 r5cf9f4884 r4cfbd2160
[<c0330c10>] (__kfree_skb+0x0/0xb8) from [<c0330d10>] (kfree_skb
[<c0330cc8>] (kfree_skb+0x0/0x4c) from [<c03dcfa0>]
[<c03dc9b0>] (__ieee80211_rx_handle_packet+0x0/0x618) from
[<c03dd7c4>] (__ieee80211_rx+0x548/0x5ac)
[<c03dd27c>] (__ieee80211_rx+0x0/0x5ac) from [<c03cd698>]
[<c03cd60c>] (ieee80211_tasklet_handler+0x0/0x114) from
[<c00692ac>] (tasklet_action+0x78/0xb8)
r8c055e5f0 r700000000 r6c055e604 r5c055e560 r400000000
[<c0069234>] (tasklet_action+0x0/0xb8) from [<c00698c0>]
r700000001 r6c051a000 r500000014 r400000100
[<c006985c>] (__do_softirq+0x0/0x100) from [<c00699a4>] (irq_exit
[<c006995c>] (irq_exit+0x0/0x88) from [<c003906c>]
[<c0039000>] (__exception_text_start+0x0/0x88) from [<c0039a30>]
Exception stack(0xc051bf20 to 0xc051bf68)
bf20 32fa4e8b a0000013 009959d0 00000000 c0045054 c051a000
c051e0e4 c003ae4c
bf40 c05573c8 411fc083 0000001f c051bf8c c051bf90 c051bf68
c003ae1c c0045150
bf60 60000013 ffffffff
r5d8200000 r4ffffffff
[<c0045054>] (omap3_pm_idle+0x0/0x130) from [<c003ae1c>] (cpu_idle
[<c003adcc>] (cpu_idle+0x0/0x80) from [<c03e97ec>] (rest_init
r88002c100 r7c051df78 r6c002df00 r5c0556f68 r4c056fa14
[<c03e9798>] (rest_init+0x0/0x68) from [<c0008974>] (start_kernel
[<c0008708>] (start_kernel+0x0/0x2d4) from [<80008034>]
r6c002e304 r5c0557434 r410c5387d
Code e3500000 0a000006 e3a03000 e5823014 (e5904000)
Kernel panic - not syncing Fatal exception in interrupt


root@beagleboard~# [ 130.690216] Unable to handle kernel paging
request at virtual address 1a000000
[ 130.697540] pgd = c0004000
[ 130.700256] [1a000000] *pgd=00000000
[ 130.704010] Internal error Oops 5 [#1]
[ 130.707977] Modules linked in
[ 130.711059] CPU 0 Not tainted (2.6.29-omap1 #1)
[ 130.716064] PC is at skb_release_data+0xa0/0xc4
[ 130.720611] LR is at __kfree_skb+0x20/0xb8
[ 130.724731] pc [<c0358638>] lr [<c0358484>] psr
[ 130.724761] sp c0555d38 ip c0555d58 fp c0555d54
[ 130.736297] r10 00000000 r9 cfb441a0 r8 cfcaa02e
[ 130.741546] r7 00000006 r6 00000000 r5 cfd0ed60 r4
[ 130.748107] r3 00000000 r2 cfcaa9c0 r1 0000002d r0
[ 130.754669] Flags nzCv IRQs on FIQs on Mode SVC_32 ISA ARM
Segment kernel
[ 130.762023] Control 10c5387d Table 8fd78019 DAC 00000017
[ 130.767791] Process swapper (pid 0, stack limit = 0xc05542e8)
[ 130.773681] Stack (0xc0555d38 to 0xc0556000)
[ 130.778045]
5d20 c035732c
[ 130.786437] 5d40 cfb44800 00000000 c0555d6c c0555d58 c0358484
c03585a4 5de57b23 cfcaa038
[ 130.794799] 5d60 c0555d7c c0555d70 c0358564 c0358470 c0555e0c
c0555d80 c040a7d4 c0358528
[ 130.803192] 5d80 c0555dac c0555d90 c02c1d98 c02c3660 cfcaa038
cfb44800 cfd0ed60 cfcaa034
[ 130.811553] 5da0 cfcaa036 cfcaa032 c02d2768 cfd0ed60 00000000
cfb441a0 00000000 00000000
[ 130.819946] 5dc0 00000000 c0555e50 cfb87180 00000006 00000000
00000004 00000000 00000000
[ 130.828308] 5de0 ffc01180 00000018 cfcaa02e 00000000 cfb442a4
00000000 c0555e50 cfb441a0
[ 130.836700] 5e00 c0555e4c c0555e10 c040b074 c040a1c8 00001da0
00000800 cfb87180 cfd0ed60
[ 130.845062] 5e20 00000000 cfd0ed60 cfb441a0 c0555e50 cfb442a4
cfb44298 00000000 0000000a
[ 130.853454] 5e40 c0555e9c c0555e50 c03fad3c c040aadc 00000000
00000000 00000000 0000096c
[ 130.861816] 5e60 ffffffc2 00000000 0000002e 00000001 00000000
00000008 c02d71a4 00000000
[ 130.870208] 5e80 c05984a0 c059853c 00000000 c0598528 c0555ebc
c0555ea0 c0062da0 c03facbc
[ 130.878601] 5ea0 00000100 00000014 c0554000 00000001 c0555ef4
c0555ec0 c00633c8 c0062d34
[ 130.886962] 5ec0 c0555eec c0555ed0 c0563930 0000004d 00000000
c0557ffc c003ce4c c05923a8
[ 130.895355] 5ee0 411fc083 0000001f c0555f04 c0555ef8 c00634a8
c0063370 c0555f1c c0555f08
[ 130.903717] 5f00 c003b05c c0063470 ffffffff d8200000 c0555f8c
c0555f20 c003ba30 c003b00c
[ 130.912109] 5f20 31d364dc a0000013 0061ca53 00000000 c004738c
c0554000 c0557ffc c003ce4c
[ 130.920471] 5f40 c05923a8 411fc083 0000001f c0555f8c c0555f90
c0555f68 c003ce1c c0047488
[ 130.928863] 5f60 60000013 ffffffff c004738c c0554000 c0557ffc
c003ce4c c05923a8 0000001f
[ 130.937225] 5f80 c0555fb4 c0555f90 c003ce1c c0047398 c0591f64
c05cba54 c0591f64 c002eea4
[ 130.945617] 5fa0 c0557e90 8002cd8c c0555fc4 c0555fb8 c04104f0
c003cdd8 c0555ff4 c0555fc8
[ 130.953979] 5fc0 c0008950 c04104a4 c0008468 00000000 00000000
c002eea4 00000000 10c5387d
[ 130.962371] 5fe0 c0592414 c002f2a8 00000000 c0555ff8 80008034
c0008714 00000000 00000000
[ 130.970733] Backtrace
[ 130.973205] [<c0358598>] (skb_release_data+0x0/0xc4) from
[<c0358484>] (__kfree_skb+0x20/0xb8)
[ 130.981903] r600000000 r5cfb44800 r4cfd0ed60
[ 130.986572] [<c0358464>] (__kfree_skb+0x0/0xb8) from
[<c0358564>] (kfree_skb+0x48/0x4c)
[ 130.994659] r4cfcaa038
[ 130.997192] [<c035851c>] (kfree_skb+0x0/0x4c) from [<c040a7d4>]
[ 131.006958] [<c040a1bc>] (__ieee80211_rx_handle_packet
+0x0/0x640) from [<c040b074>] (__ieee80211_rx+0x5a4/0x608)
[ 131.017211] [<c040aad0>] (__ieee80211_rx+0x0/0x608) from
[<c03fad3c>] (ieee80211_tasklet_handler+0x8c/0x120)
[ 131.027160] [<c03facb0>] (ieee80211_tasklet_handler+0x0/0x120)
from [<c0062da0>] (tasklet_action+0x78/0xb8)
[ 131.036987] r8c0598528 r700000000 r6c059853c r5c05984a0
[ 131.043762] [<c0062d28>] (tasklet_action+0x0/0xb8) from
[<c00633c8>] (__do_softirq+0x64/0x100)
[ 131.052459] r700000001 r6c0554000 r500000014 r400000100
[ 131.058197] [<c0063364>] (__do_softirq+0x0/0x100) from
[<c00634a8>] (irq_exit+0x44/0x88)
[ 131.066345] [<c0063464>] (irq_exit+0x0/0x88) from [<c003b05c>]
[ 131.075317] [<c003b000>] (__exception_text_start+0x0/0x70) from
[<c003ba30>] (__irq_svc+0x30/0x80)
[ 131.084350] Exception stack(0xc0555f20 to 0xc0555f68)
[ 131.089416] 5f20 31d364dc a0000013 0061ca53 00000000 c004738c
c0554000 c0557ffc c003ce4c
[ 131.097808] 5f40 c05923a8 411fc083 0000001f c0555f8c c0555f90
c0555f68 c003ce1c c0047488
[ 131.106170] 5f60 60000013 ffffffff
[ 131.114562] r5d8200000 r4ffffffff
[ 131.118164] [<c004738c>] (omap3_pm_idle+0x0/0x130) from
[<c003ce1c>] (cpu_idle+0x50/0x80)
[ 131.126434] [<c003cdcc>] (cpu_idle+0x0/0x80) from [<c04104f0>]
[ 131.134277] r88002cd8c r7c0557e90 r6c002eea4 r5c0591f64
[ 131.141052] [<c0410498>] (rest_init+0x0/0x6c) from [<c0008950>]
[ 131.149383] [<c0008708>] (start_kernel+0x0/0x2a4) from
[<80008034>] (0x80008034)
[ 131.156860] r6c002f2a8 r5c0592414 r410c5387d
[ 131.161529] Code e3500000 0a000006 e3a03000 e5823014 (e5904000)
[ 131.168457] Kernel panic - not syncing Fatal exception in

thanks and greets,



15-04-2009 18:57:10

All problems seem to occur within the mac80211 stack,
could you try the compat-wireless package from

If that fails as well, I recommend reporting the bug in
or send a mail to the mailinglist.