Wireless-testing's b43 panics in b43_generate_txhdr on packet transmit

[Stefanik Gábor]

In the latest wireless-testing kernel, I get a panic when I try to
connect to a network or inject a packet in monitor mode using b43
(stack obtained using kdump and crash):

crash> bt -l
PID: 0      TASK: c0431340  CPU: 0   COMMAND: "swapper"
 #0 [c04617bc] crash_kexec at c015ce2a
    /usr/src/wl-hack/wireless-testing/kernel/kexec.c: 1077
 #1 [c046180c] die at c01054ba
    /usr/src/wl-hack/wireless-testing/arch/x86/kernel/traps_32.c: 476
 #2 [c0461828] do_page_fault at c034ef1f
    /usr/src/wl-hack/wireless-testing/arch/x86/mm/fault.c: 858
 #3 [c0461994] error_code (via page_fault) at c034d2e8
    /usr/src/wl-hack/wireless-testing/arch/i386/kernel/entry.S
    EAX: 00000000  EBX: 00000000  ECX: f6103000  EDX: f75ed4a0  EBP: c0461a58
    DS:  007b      ESI: 00000002  ES:  007b      EDI: 00000074
    CS:  0060      EIP: f8dd3a99  ERR: ffffffff  EFLAGS: 00010046
 #4 [c04619c8] b43_generate_txhdr at f8dd3a99
 #5 [c0461a5c] b43_dma_tx at f8dd83d7
 #6 [c0461ae4] b43_op_tx at f8dc4d32
 #7 [c0461afc] __ieee80211_tx at f89c3ed4
 #8 [c0461b14] ieee80211_master_start_xmit at f89c4b6d
 #9 [c0461b74] dev_hard_start_xmit at c02d4cb5
    /usr/src/wl-hack/wireless-testing/net/core/dev.c: 1558
#10 [c0461ba0] __qdisc_run at c02e678d
    /usr/src/wl-hack/wireless-testing/net/sched/sch_generic.c: 155
#11 [c0461bd8] dev_queue_xmit at c02d5172
    include/net/pkt_sched.h: 89
#12 [c0461c04] ieee80211_subif_start_xmit at f89c45db
#13 [c0461cc0] dev_hard_start_xmit at c02d4cb5
    /usr/src/wl-hack/wireless-testing/net/core/dev.c: 1558
#14 [c0461cec] __qdisc_run at c02e678d
    /usr/src/wl-hack/wireless-testing/net/sched/sch_generic.c: 155
#15 [c0461d24] dev_queue_xmit at c02d5172
    include/net/pkt_sched.h: 89
#16 [c0461d50] neigh_resolve_output at c02dac3e
    /usr/src/wl-hack/wireless-testing/net/core/neighbour.c: 1215
#17 [c0461d90] ip6_output_finish at f8d55c9e
#18 [c0461db0] ip6_output2 at f8d57e63
#19 [c0461dd4] ip6_output at f8d58418
#20 [c0461e50] mld_sendpack at f8d70d8d
#21 [c0461ebc] mld_ifc_timer_expire at f8d71a94
#22 [c0461ef0] run_timer_softirq at c0138547
    /usr/src/wl-hack/wireless-testing/kernel/timer.c: 798
#23 [c0461f34] __do_softirq at c0134230
    /usr/src/wl-hack/wireless-testing/kernel/softirq.c: 234
#24 [c0461f50] do_softirq at c0134318
    /usr/src/wl-hack/wireless-testing/kernel/softirq.c: 271
#25 [c0461f5c] irq_exit at c01344b0
    /usr/src/wl-hack/wireless-testing/kernel/softirq.c: 310
#26 [c0461f64] smp_apic_timer_interrupt at c0113583
    /usr/src/wl-hack/wireless-testing/arch/x86/kernel/apic_32.c: 619
#27 [c0461f7c] apic_timer_interrupt at c0104963
    include/linux/kdev_t.h: 52
#28 [c0461fbc] cpu_idle at c0102d69
    /usr/src/wl-hack/wireless-testing/arch/x86/kernel/process_32.c: 188

No out-of-tree patches applied on b43. (I used to have a patch
applied, but I removed it to test reproducibility of this crash.)

Any ideas why this happens?

Thanks,
Gábor
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