Message-ID: <51E87A2F.5070305@lwfinger.net>
Date:	Thu, 18 Jul 2013 18:28:47 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Aaro Koskinen <aaro.koskinen@....fi>
CC:	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	Felix Fietkau <nbd@...nwrt.org>,
	Johannes Berg <johannes.berg@...el.com>
Subject: Re: v3.10/v3.11-rc1: mac80211/minstrel kernel crash

On 07/18/2013 05:21 PM, Aaro Koskinen wrote:
> Hello,
>
> It seems this has been broken already a while, I bisected it back to
> 06d961a8e210035bff7e82f466107f9ab4a8fd94 (mac80211/minstrel: use the
> new rate control API).
>
> Test case:
>
> 	modprobe b43
> 	ifconfig wlan0 up
> 	iwlist wlan0 scanning
>
> Result:
>
> [   95.244268] b43-phy0: Broadcom 4318 WLAN found (core revision 9)
> [   95.352823] b43-phy0: Found PHY: Analog 3, Type 2 (G), Revision 7
> [   95.423298] ieee80211 phy0: Selected rate control algorithm 'minstrel'
> [   95.438266] Broadcom 43xx driver loaded [ Features: PN ]
> [   99.482832] b43-phy0: Loading firmware version 666.2 (2011-02-23 01:15:07)
> [   99.522916] b43-pci-bridge 0001:01:01.0: Using 32-bit DMA via iommu
> [  123.452854] Unable to handle kernel paging request for data at address 0x00000048
> [  123.466119] Faulting instruction address: 0xc000000000673a1c
> [  123.479072] Oops: Kernel access of bad area, sig: 11 [#1]
> [  123.491678] PREEMPT PowerMac
> [  123.503946] Modules linked in: b43 netconsole
> [  123.515992] CPU: 0 PID: 490 Comm: kworker/u2:4 Not tainted 3.11.0-rc1-imac #1
> [  123.527834] Workqueue: phy0 .ieee80211_scan_work
> [  123.539275] task: c00000011a6bbdb0 ti: c00000011a120000 task.ti: c00000011a120000
> [  123.551071] NIP: c000000000673a1c LR: c000000000653288 CTR: c0000000006739e0
> [  123.563010] REGS: c00000011a123310 TRAP: 0300   Not tainted  (3.11.0-rc1-imac)
> [  123.575142] MSR: 9000000000009032 <SF,HV,EE,ME,IR,DR,RI>  CR: 24002082  XER: 00000000
> [  123.587884] SOFTE: 1
> [  123.600276] DAR: 0000000000000048, DSISR: 40000000
> [  123.612867]
> GPR00: c000000000653288 c00000011a123590 c0000000009dba98 0000000000000000
> GPR04: 0000000000000000 c00000011a123730 c00000011a123730 0000000000000000
> GPR08: c00000011a162609 c0000000009d36d8 c0000000006739e0 c00000011a162600
> GPR12: 0000000024002088 c00000000ffff000 c000000000077d90 c00000011a4dfa70
> GPR16: 0000000000000000 0000000000000000 0000000000000001 0000000000000000
> GPR20: 0000000000000000 0000000000000001 c00000000092df7f c00000011a355130
> GPR24: 000000000000000a c00000011a123b60 c00000011a356660 c00000011a162600
> GPR28: c00000011a461fc0 c00000011a162600 c00000011a123730 0000000000000000
> [  123.728058] NIP [c000000000673a1c] .minstrel_get_rate+0x3c/0x2e0
> [  123.740466] LR [c000000000653288] .rate_control_get_rate+0xf8/0x140
> [  123.752720] Call Trace:
> [  123.764951] [c00000011a123590] [c00000011a123620] 0xc00000011a123620 (unreliable)
> [  123.777526] [c00000011a123630] [c000000000653288] .rate_control_get_rate+0xf8/0x140
> [  123.790079] [c00000011a1236c0] [c000000000660ac8] .invoke_tx_handlers+0x8c8/0x14f0
> [  123.802633] [c00000011a1237f0] [c000000000662304] .ieee80211_tx+0x84/0x140
> [  123.815205] [c00000011a1238e0] [c000000000663c70] .__ieee80211_tx_skb_tid_band+0x70/0xa0
> [  123.827893] [c00000011a123970] [c000000000669b70] .ieee80211_send_probe_req+0x100/0x150
> [  123.840688] [c00000011a123a20] [c000000000645290] .ieee80211_scan_state_send_probe+0xc0/0x120
> [  123.853578] [c00000011a123af0] [c00000000064624c] .ieee80211_scan_work+0x26c/0x530
> [  123.866581] [c00000011a123bd0] [c00000000006ef5c] .process_one_work+0x17c/0x410
> [  123.879178] [c00000011a123c70] [c00000000006fd80] .worker_thread+0x180/0x4d0
> [  123.891354] [c00000011a123d40] [c000000000077e78] .kthread+0xe8/0xf0
> [  123.903468] [c00000011a123e30] [c000000000008ea0] .ret_from_kernel_thread+0x5c/0xbc
> [  123.915706] Instruction dump:
> [  123.927916] fbe1fff8 fb61ffd8 fba1ffe8 f8010010 f821ff61 7cbf2b78 7c7c1b78 7cc53378
> [  123.940781] 7c832378 7fe4fb78 7cde3378 eba60018 <8b7f0048> 4bfdec61 60000000 2fa30000
> [  123.953961] ---[ end trace 5ead5367d5fdf880 ]---
> [  123.966739]
> [  124.969488] Kernel panic - not syncing: Fatal exception in interrupt
> [  124.982408] Rebooting in 180 seconds..
>
> Kernel config:
>
> #
> # Automatically generated file; DO NOT EDIT.
> # Linux/powerpc 3.11.0-rc1 Kernel Configuration
> #
> CONFIG_PPC64=y
>
> #
> # Processor support
> #
> CONFIG_PPC_BOOK3S_64=y
> # CONFIG_PPC_BOOK3E_64 is not set
> # CONFIG_GENERIC_CPU is not set
> # CONFIG_CELL_CPU is not set
> CONFIG_POWER4_CPU=y
> # CONFIG_POWER5_CPU is not set
> # CONFIG_POWER6_CPU is not set
> # CONFIG_POWER7_CPU is not set
> CONFIG_PPC_BOOK3S=y
> CONFIG_POWER3=y
> CONFIG_POWER4=y
> # CONFIG_TUNE_CELL is not set
> CONFIG_PPC_FPU=y
> CONFIG_ALTIVEC=y
> # CONFIG_VSX is not set
> # CONFIG_PPC_ICSWX is not set
> CONFIG_PPC_STD_MMU=y
> CONFIG_PPC_STD_MMU_64=y
> # CONFIG_PPC_MM_SLICES is not set
> CONFIG_PPC_HAVE_PMU_SUPPORT=y
> CONFIG_PPC_PERF_CTRS=y
> # CONFIG_SMP is not set
> # CONFIG_PPC_DOORBELL is not set
> CONFIG_64BIT=y
> CONFIG_WORD_SIZE=64
> CONFIG_ARCH_PHYS_ADDR_T_64BIT=y
> CONFIG_ARCH_DMA_ADDR_T_64BIT=y
> CONFIG_MMU=y
> CONFIG_HAVE_SETUP_PER_CPU_AREA=y
> CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK=y
> CONFIG_NR_IRQS=512
> CONFIG_STACKTRACE_SUPPORT=y
> CONFIG_HAVE_LATENCYTOP_SUPPORT=y
> CONFIG_TRACE_IRQFLAGS_SUPPORT=y
> CONFIG_LOCKDEP_SUPPORT=y
> CONFIG_RWSEM_XCHGADD_ALGORITHM=y
> CONFIG_ARCH_HAS_ILOG2_U32=y
> CONFIG_ARCH_HAS_ILOG2_U64=y
> CONFIG_GENERIC_HWEIGHT=y
> CONFIG_PPC=y
> CONFIG_EARLY_PRINTK=y
> CONFIG_COMPAT=y
> CONFIG_SYSVIPC_COMPAT=y
> CONFIG_SCHED_OMIT_FRAME_POINTER=y
> CONFIG_ARCH_MAY_HAVE_PC_FDC=y
> CONFIG_PPC_OF=y
> # CONFIG_PPC_UDBG_16550 is not set
> CONFIG_GENERIC_TBSYNC=y
> CONFIG_AUDIT_ARCH=y
> CONFIG_GENERIC_BUG=y
> # CONFIG_EPAPR_BOOT is not set
> # CONFIG_DEFAULT_UIMAGE is not set
> CONFIG_ARCH_HIBERNATION_POSSIBLE=y
> CONFIG_ARCH_SUSPEND_POSSIBLE=y
> # CONFIG_PPC_DCR_NATIVE is not set
> # CONFIG_PPC_DCR_MMIO is not set
> # CONFIG_PPC_OF_PLATFORM_PCI is not set
> CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC=y
> CONFIG_ARCH_SUPPORTS_UPROBES=y
> CONFIG_PPC_EMULATE_SSTEP=y
> CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
> CONFIG_IRQ_WORK=y
>
> #
> # General setup
> #
> CONFIG_BROKEN_ON_SMP=y
> CONFIG_INIT_ENV_ARG_LIMIT=32
> CONFIG_CROSS_COMPILE=""
> # CONFIG_COMPILE_TEST is not set
> CONFIG_LOCALVERSION="-imac"
> CONFIG_LOCALVERSION_AUTO=y
> CONFIG_DEFAULT_HOSTNAME="(none)"
> CONFIG_SWAP=y
> CONFIG_SYSVIPC=y
> CONFIG_SYSVIPC_SYSCTL=y
> CONFIG_POSIX_MQUEUE=y
> CONFIG_POSIX_MQUEUE_SYSCTL=y
> # CONFIG_FHANDLE is not set
> # CONFIG_AUDIT is not set
> CONFIG_HAVE_GENERIC_HARDIRQS=y
>
> #
> # IRQ subsystem
> #
> CONFIG_GENERIC_HARDIRQS=y
> CONFIG_GENERIC_IRQ_SHOW=y
> CONFIG_GENERIC_IRQ_SHOW_LEVEL=y
> CONFIG_IRQ_DOMAIN=y
> CONFIG_IRQ_FORCED_THREADING=y
> CONFIG_SPARSE_IRQ=y
> CONFIG_GENERIC_TIME_VSYSCALL_OLD=y
> CONFIG_GENERIC_CLOCKEVENTS=y
> CONFIG_GENERIC_CLOCKEVENTS_BUILD=y
> CONFIG_GENERIC_CMOS_UPDATE=y
>
> #
> # Timers subsystem
> #
> CONFIG_TICK_ONESHOT=y
> CONFIG_NO_HZ_COMMON=y
> # CONFIG_HZ_PERIODIC is not set
> CONFIG_NO_HZ_IDLE=y
> CONFIG_NO_HZ=y
> CONFIG_HIGH_RES_TIMERS=y
>
> #
> # CPU/Task time and stats accounting
> #
> CONFIG_VIRT_CPU_ACCOUNTING=y
> # CONFIG_TICK_CPU_ACCOUNTING is not set
> CONFIG_VIRT_CPU_ACCOUNTING_NATIVE=y
> # CONFIG_BSD_PROCESS_ACCT is not set
> # CONFIG_TASKSTATS is not set
>
> #
> # RCU Subsystem
> #
> CONFIG_TREE_PREEMPT_RCU=y
> CONFIG_PREEMPT_RCU=y
> CONFIG_RCU_STALL_COMMON=y
> CONFIG_RCU_FANOUT=64
> CONFIG_RCU_FANOUT_LEAF=16
> # CONFIG_RCU_FANOUT_EXACT is not set
> # CONFIG_TREE_RCU_TRACE is not set
> # CONFIG_RCU_BOOST is not set
> # CONFIG_RCU_NOCB_CPU is not set
> # CONFIG_IKCONFIG is not set
> CONFIG_LOG_BUF_SHIFT=17
> CONFIG_CGROUPS=y
> # CONFIG_CGROUP_DEBUG is not set
> # CONFIG_CGROUP_FREEZER is not set
> # CONFIG_CGROUP_DEVICE is not set
> # CONFIG_CPUSETS is not set
> # CONFIG_CGROUP_CPUACCT is not set
> # CONFIG_RESOURCE_COUNTERS is not set
> # CONFIG_CGROUP_PERF is not set
> CONFIG_CGROUP_SCHED=y
> CONFIG_FAIR_GROUP_SCHED=y
> # CONFIG_CFS_BANDWIDTH is not set
> # CONFIG_RT_GROUP_SCHED is not set
> # CONFIG_BLK_CGROUP is not set
> # CONFIG_CHECKPOINT_RESTORE is not set
> # CONFIG_NAMESPACES is not set
> CONFIG_UIDGID_CONVERTED=y
> # CONFIG_UIDGID_STRICT_TYPE_CHECKS is not set
> CONFIG_SCHED_AUTOGROUP=y
> # CONFIG_SYSFS_DEPRECATED is not set
> # CONFIG_RELAY is not set
> CONFIG_BLK_DEV_INITRD=y
> CONFIG_INITRAMFS_SOURCE=""
> # CONFIG_RD_GZIP is not set
> # CONFIG_RD_BZIP2 is not set
> CONFIG_RD_LZMA=y
> # CONFIG_RD_XZ is not set
> # CONFIG_RD_LZO is not set
> # CONFIG_RD_LZ4 is not set
> # CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
> CONFIG_SYSCTL=y
> CONFIG_ANON_INODES=y
> CONFIG_SYSCTL_EXCEPTION_TRACE=y
> CONFIG_EXPERT=y
> # CONFIG_SYSCTL_SYSCALL is not set
> CONFIG_KALLSYMS=y
> CONFIG_KALLSYMS_ALL=y
> CONFIG_PRINTK=y
> CONFIG_BUG=y
> CONFIG_ELF_CORE=y
> CONFIG_BASE_FULL=y
> CONFIG_FUTEX=y
> CONFIG_EPOLL=y
> CONFIG_SIGNALFD=y
> CONFIG_TIMERFD=y
> CONFIG_EVENTFD=y
> CONFIG_SHMEM=y
> CONFIG_AIO=y
> CONFIG_PCI_QUIRKS=y
> # CONFIG_EMBEDDED is not set
> CONFIG_HAVE_PERF_EVENTS=y
>
> #
> # Kernel Performance Events And Counters
> #
> CONFIG_PERF_EVENTS=y
> # CONFIG_DEBUG_PERF_USE_VMALLOC is not set
> CONFIG_VM_EVENT_COUNTERS=y
> CONFIG_SLUB_DEBUG=y
> # CONFIG_COMPAT_BRK is not set
> # CONFIG_SLAB is not set
> CONFIG_SLUB=y
> # CONFIG_SLOB is not set
> CONFIG_SLUB_CPU_PARTIAL=y
> CONFIG_PROFILING=y
> CONFIG_OPROFILE=m
> CONFIG_HAVE_OPROFILE=y
> # CONFIG_KPROBES is not set
> # CONFIG_JUMP_LABEL is not set
> # CONFIG_HAVE_64BIT_ALIGNED_ACCESS is not set
> CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS=y
> CONFIG_ARCH_USE_BUILTIN_BSWAP=y
> CONFIG_HAVE_IOREMAP_PROT=y
> CONFIG_HAVE_KPROBES=y
> CONFIG_HAVE_KRETPROBES=y
> CONFIG_HAVE_ARCH_TRACEHOOK=y
> CONFIG_HAVE_DMA_ATTRS=y
> CONFIG_GENERIC_SMP_IDLE_THREAD=y
> CONFIG_HAVE_REGS_AND_STACK_ACCESS_API=y
> CONFIG_HAVE_DMA_API_DEBUG=y
> CONFIG_HAVE_HW_BREAKPOINT=y
> CONFIG_HAVE_ARCH_JUMP_LABEL=y
> CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG=y
> CONFIG_ARCH_WANT_IPC_PARSE_VERSION=y
> CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION=y
> CONFIG_ARCH_WANT_OLD_COMPAT_IPC=y
> CONFIG_HAVE_VIRT_CPU_ACCOUNTING=y
> CONFIG_HAVE_MOD_ARCH_SPECIFIC=y
> CONFIG_MODULES_USE_ELF_RELA=y
> CONFIG_CLONE_BACKWARDS=y
> CONFIG_OLD_SIGSUSPEND=y
> CONFIG_COMPAT_OLD_SIGACTION=y
>
> #
> # GCOV-based kernel profiling
> #
> # CONFIG_HAVE_GENERIC_DMA_COHERENT is not set
> CONFIG_SLABINFO=y
> CONFIG_RT_MUTEXES=y
> CONFIG_BASE_SMALL=0
> CONFIG_MODULES=y
> # CONFIG_MODULE_FORCE_LOAD is not set
> CONFIG_MODULE_UNLOAD=y
> # CONFIG_MODULE_FORCE_UNLOAD is not set
> # CONFIG_MODVERSIONS is not set
> # CONFIG_MODULE_SRCVERSION_ALL is not set
> # CONFIG_MODULE_SIG is not set
> CONFIG_BLOCK=y
> CONFIG_BLK_DEV_BSG=y
> # CONFIG_BLK_DEV_BSGLIB is not set
> # CONFIG_BLK_DEV_INTEGRITY is not set
>
> #
> # Partition Types
> #
> CONFIG_PARTITION_ADVANCED=y
> # CONFIG_ACORN_PARTITION is not set
> # CONFIG_AIX_PARTITION is not set
> # CONFIG_OSF_PARTITION is not set
> # CONFIG_AMIGA_PARTITION is not set
> # CONFIG_ATARI_PARTITION is not set
> CONFIG_MAC_PARTITION=y
> CONFIG_MSDOS_PARTITION=y
> # CONFIG_BSD_DISKLABEL is not set
> # CONFIG_MINIX_SUBPARTITION is not set
> # CONFIG_SOLARIS_X86_PARTITION is not set
> # CONFIG_UNIXWARE_DISKLABEL is not set
> # CONFIG_LDM_PARTITION is not set
> # CONFIG_SGI_PARTITION is not set
> # CONFIG_ULTRIX_PARTITION is not set
> # CONFIG_SUN_PARTITION is not set
> # CONFIG_KARMA_PARTITION is not set
> CONFIG_EFI_PARTITION=y
> # CONFIG_SYSV68_PARTITION is not set
> CONFIG_BLOCK_COMPAT=y
>
> #
> # IO Schedulers
> #
> CONFIG_IOSCHED_NOOP=y
> # CONFIG_IOSCHED_DEADLINE is not set
> CONFIG_IOSCHED_CFQ=y
> CONFIG_DEFAULT_CFQ=y
> # CONFIG_DEFAULT_NOOP is not set
> CONFIG_DEFAULT_IOSCHED="cfq"
> CONFIG_UNINLINE_SPIN_UNLOCK=y
> CONFIG_FREEZER=y
> CONFIG_PPC_MSI_BITMAP=y
> # CONFIG_PPC_XICS is not set
> # CONFIG_PPC_ICP_NATIVE is not set
> # CONFIG_PPC_ICP_HV is not set
> # CONFIG_PPC_ICS_RTAS is not set
> # CONFIG_GE_FPGA is not set
>
> #
> # Platform support
> #
> # CONFIG_PPC_POWERNV is not set
> CONFIG_POWERNV_MSI=y
> # CONFIG_PPC_PSERIES is not set
> CONFIG_PPC_PMAC=y
> CONFIG_PPC_PMAC64=y
> # CONFIG_PPC_MAPLE is not set
> # CONFIG_PPC_PASEMI is not set
> # CONFIG_PPC_PS3 is not set
> # CONFIG_PPC_CELL is not set
> # CONFIG_PPC_CELL_NATIVE is not set
> # CONFIG_PPC_IBM_CELL_BLADE is not set
> # CONFIG_PPC_CELLEB is not set
> # CONFIG_PPC_CELL_QPACE is not set
> # CONFIG_PQ2ADS is not set
> # CONFIG_PPC_WSP is not set
> # CONFIG_KVM_GUEST is not set
> # CONFIG_EPAPR_PARAVIRT is not set
> CONFIG_PPC_NATIVE=y
> CONFIG_PPC_OF_BOOT_TRAMPOLINE=y
> # CONFIG_IPIC is not set
> CONFIG_MPIC=y
> # CONFIG_PPC_EPAPR_HV_PIC is not set
> # CONFIG_MPIC_WEIRD is not set
> # CONFIG_MPIC_MSGR is not set
> # CONFIG_PPC_I8259 is not set
> CONFIG_U3_DART=y
> # CONFIG_PPC_RTAS is not set
> # CONFIG_MMIO_NVRAM is not set
> CONFIG_MPIC_U3_HT_IRQS=y
> # CONFIG_PPC_MPC106 is not set
> CONFIG_PPC_970_NAP=y
> # CONFIG_PPC_P7_NAP is not set
>
> #
> # CPU Frequency scaling
> #
> CONFIG_CPU_FREQ=y
> CONFIG_CPU_FREQ_TABLE=y
> CONFIG_CPU_FREQ_GOV_COMMON=y
> CONFIG_CPU_FREQ_STAT=y
> # CONFIG_CPU_FREQ_STAT_DETAILS is not set
> # CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
> # CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE is not set
> # CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
> CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
> # CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set
> CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
> # CONFIG_CPU_FREQ_GOV_POWERSAVE is not set
> # CONFIG_CPU_FREQ_GOV_USERSPACE is not set
> CONFIG_CPU_FREQ_GOV_ONDEMAND=y
> # CONFIG_CPU_FREQ_GOV_CONSERVATIVE is not set
>
> #
> # PowerPC CPU frequency scaling drivers
> #
> CONFIG_CPU_FREQ_PMAC64=y
>
> #
> # CPUIdle driver
> #
> # CONFIG_CPU_IDLE is not set
> # CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED is not set
> # CONFIG_FSL_ULI1575 is not set
> # CONFIG_SIMPLE_GPIO is not set
>
> #
> # Kernel options
> #
> CONFIG_HZ_100=y
> # CONFIG_HZ_250 is not set
> # CONFIG_HZ_300 is not set
> # CONFIG_HZ_1000 is not set
> CONFIG_HZ=100
> CONFIG_SCHED_HRTICK=y
> # CONFIG_PREEMPT_NONE is not set
> # CONFIG_PREEMPT_VOLUNTARY is not set
> CONFIG_PREEMPT=y
> CONFIG_PREEMPT_COUNT=y
> CONFIG_BINFMT_ELF=y
> CONFIG_COMPAT_BINFMT_ELF=y
> CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS=y
> CONFIG_BINFMT_SCRIPT=y
> # CONFIG_HAVE_AOUT is not set
> # CONFIG_BINFMT_MISC is not set
> CONFIG_COREDUMP=y
> CONFIG_IOMMU_HELPER=y
> # CONFIG_SWIOTLB is not set
> CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
> CONFIG_ARCH_HAS_WALK_MEMORY=y
> CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE=y
> # CONFIG_KEXEC is not set
> # CONFIG_CRASH_DUMP is not set
> # CONFIG_NUMA is not set
> CONFIG_ARCH_SELECT_MEMORY_MODEL=y
> CONFIG_ARCH_FLATMEM_ENABLE=y
> CONFIG_ARCH_SPARSEMEM_ENABLE=y
> CONFIG_SYS_SUPPORTS_HUGETLBFS=y
> CONFIG_SELECT_MEMORY_MODEL=y
> CONFIG_FLATMEM_MANUAL=y
> # CONFIG_SPARSEMEM_MANUAL is not set
> CONFIG_FLATMEM=y
> CONFIG_FLAT_NODE_MEM_MAP=y
> CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y
> CONFIG_HAVE_MEMBLOCK=y
> CONFIG_HAVE_MEMBLOCK_NODE_MAP=y
> # CONFIG_HAVE_BOOTMEM_INFO_NODE is not set
> CONFIG_PAGEFLAGS_EXTENDED=y
> CONFIG_SPLIT_PTLOCK_CPUS=4
> CONFIG_COMPACTION=y
> CONFIG_MIGRATION=y
> CONFIG_PHYS_ADDR_T_64BIT=y
> CONFIG_ZONE_DMA_FLAG=1
> CONFIG_BOUNCE=y
> # CONFIG_KSM is not set
> CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
> # CONFIG_CROSS_MEMORY_ATTACH is not set
> CONFIG_NEED_PER_CPU_KM=y
> # CONFIG_CLEANCACHE is not set
> # CONFIG_FRONTSWAP is not set
> # CONFIG_ZBUD is not set
> # CONFIG_PPC_HAS_HASH_64K is not set
> CONFIG_PPC_4K_PAGES=y
> # CONFIG_PPC_64K_PAGES is not set
> CONFIG_FORCE_MAX_ZONEORDER=13
> # CONFIG_PPC_DENORMALISATION is not set
> # CONFIG_CMDLINE_BOOL is not set
> CONFIG_EXTRA_TARGETS=""
> CONFIG_ARCH_WANTS_FREEZER_CONTROL=y
> CONFIG_SUSPEND=y
> CONFIG_SUSPEND_FREEZER=y
> # CONFIG_HIBERNATION is not set
> CONFIG_PM_SLEEP=y
> # CONFIG_PM_AUTOSLEEP is not set
> # CONFIG_PM_WAKELOCKS is not set
> # CONFIG_PM_RUNTIME is not set
> CONFIG_PM=y
> # CONFIG_PM_DEBUG is not set
> # CONFIG_WQ_POWER_EFFICIENT_DEFAULT is not set
> # CONFIG_SECCOMP is not set
> CONFIG_ISA_DMA_API=y
>
> #
> # Bus options
> #
> CONFIG_ZONE_DMA=y
> CONFIG_NEED_DMA_MAP_STATE=y
> CONFIG_NEED_SG_DMA_LENGTH=y
> CONFIG_GENERIC_ISA_DMA=y
> # CONFIG_PPC_INDIRECT_PCI is not set
> CONFIG_PCI=y
> CONFIG_PCI_DOMAINS=y
> CONFIG_PCI_SYSCALL=y
> # CONFIG_PCIEPORTBUS is not set
> CONFIG_ARCH_SUPPORTS_MSI=y
> CONFIG_PCI_MSI=y
> # CONFIG_PCI_DEBUG is not set
> # CONFIG_PCI_REALLOC_ENABLE_AUTO is not set
> # CONFIG_PCI_STUB is not set
> # CONFIG_PCI_IOV is not set
> # CONFIG_PCI_PRI is not set
> # CONFIG_PCI_PASID is not set
>
> #
> # PCI host controller drivers
> #
> # CONFIG_PCCARD is not set
> # CONFIG_HOTPLUG_PCI is not set
> # CONFIG_HAS_RAPIDIO is not set
> # CONFIG_RAPIDIO is not set
> # CONFIG_NONSTATIC_KERNEL is not set
> # CONFIG_RELOCATABLE is not set
> CONFIG_PAGE_OFFSET=0xc000000000000000
> CONFIG_KERNEL_START=0xc000000000000000
> CONFIG_PHYSICAL_START=0x00000000
> CONFIG_NET=y
> CONFIG_COMPAT_NETLINK_MESSAGES=y
>
> #
> # Networking options
> #
> CONFIG_PACKET=y
> # CONFIG_PACKET_DIAG is not set
> CONFIG_UNIX=y
> # CONFIG_UNIX_DIAG is not set
> # CONFIG_XFRM_USER is not set
> # CONFIG_NET_KEY is not set
> CONFIG_INET=y
> # CONFIG_IP_MULTICAST is not set
> # CONFIG_IP_ADVANCED_ROUTER is not set
> # CONFIG_IP_PNP is not set
> # CONFIG_NET_IPIP is not set
> # CONFIG_NET_IPGRE_DEMUX is not set
> # CONFIG_NET_IP_TUNNEL is not set
> # CONFIG_ARPD is not set
> # CONFIG_SYN_COOKIES is not set
> # CONFIG_INET_AH is not set
> # CONFIG_INET_ESP is not set
> # CONFIG_INET_IPCOMP is not set
> # CONFIG_INET_XFRM_TUNNEL is not set
> # CONFIG_INET_TUNNEL is not set
> # CONFIG_INET_XFRM_MODE_TRANSPORT is not set
> # CONFIG_INET_XFRM_MODE_TUNNEL is not set
> # CONFIG_INET_XFRM_MODE_BEET is not set
> CONFIG_INET_LRO=y
> # CONFIG_INET_DIAG is not set
> # CONFIG_TCP_CONG_ADVANCED is not set
> CONFIG_TCP_CONG_CUBIC=y
> CONFIG_DEFAULT_TCP_CONG="cubic"
> # CONFIG_TCP_MD5SIG is not set
> # CONFIG_IPV6 is not set
> # CONFIG_NETWORK_SECMARK is not set
> # CONFIG_NETWORK_PHY_TIMESTAMPING is not set
> # CONFIG_NETFILTER is not set
> # CONFIG_IP_DCCP is not set
> # CONFIG_IP_SCTP is not set
> # CONFIG_RDS is not set
> # CONFIG_TIPC is not set
> # CONFIG_ATM is not set
> # CONFIG_L2TP is not set
> # CONFIG_BRIDGE is not set
> CONFIG_HAVE_NET_DSA=y
> # CONFIG_VLAN_8021Q is not set
> # CONFIG_DECNET is not set
> # CONFIG_LLC2 is not set
> # CONFIG_IPX is not set
> # CONFIG_ATALK is not set
> # CONFIG_X25 is not set
> # CONFIG_LAPB is not set
> # CONFIG_PHONET is not set
> # CONFIG_IEEE802154 is not set
> # CONFIG_NET_SCHED is not set
> # CONFIG_DCB is not set
> # CONFIG_BATMAN_ADV is not set
> # CONFIG_OPENVSWITCH is not set
> # CONFIG_VSOCKETS is not set
> # CONFIG_NETLINK_MMAP is not set
> # CONFIG_NETLINK_DIAG is not set
> # CONFIG_NET_MPLS_GSO is not set
> # CONFIG_NETPRIO_CGROUP is not set
> CONFIG_NET_LL_RX_POLL=y
> CONFIG_BQL=y
> # CONFIG_BPF_JIT is not set
>
> #
> # Network testing
> #
> # CONFIG_NET_PKTGEN is not set
> # CONFIG_HAMRADIO is not set
> # CONFIG_CAN is not set
> # CONFIG_IRDA is not set
> # CONFIG_BT is not set
> # CONFIG_AF_RXRPC is not set
> CONFIG_WIRELESS=y
> CONFIG_WEXT_CORE=y
> CONFIG_WEXT_PROC=y
> CONFIG_CFG80211=y
> # CONFIG_NL80211_TESTMODE is not set
> # CONFIG_CFG80211_DEVELOPER_WARNINGS is not set
> # CONFIG_CFG80211_REG_DEBUG is not set
> # CONFIG_CFG80211_CERTIFICATION_ONUS is not set
> CONFIG_CFG80211_DEFAULT_PS=y
> # CONFIG_CFG80211_INTERNAL_REGDB is not set
> CONFIG_CFG80211_WEXT=y
> # CONFIG_LIB80211 is not set
> CONFIG_MAC80211=y
> CONFIG_MAC80211_HAS_RC=y
> # CONFIG_MAC80211_RC_PID is not set
> CONFIG_MAC80211_RC_MINSTREL=y
> # CONFIG_MAC80211_RC_MINSTREL_HT is not set
> CONFIG_MAC80211_RC_DEFAULT_MINSTREL=y
> CONFIG_MAC80211_RC_DEFAULT="minstrel"

Does it help if you enable CONFIG_MAC80211_RC_MINSTREL_HT and make it default? I 
also have a PPC box with a PCMCIA-based BCM4318 and I do not see the problem 
with those differences. The other difference that I see is that I use the LXDE 
desktop and control the network with NetworkManager.

Larry


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