[ath9k-devel] Failed to stop TX DMA

[Ben Greear <greearb@candelatech.com>]

On 01/27/2012 10:30 AM, Sune M?lgaard wrote:
> Ben Greear wrote:
>> On 01/27/2012 03:47 AM, Sune M?lgaard wrote:

>> If you hit the problem on my kernel, please send me a full bug report
>> (kernel splat, 'lspci', brief
>> description of how you caused the problem, how reproducible it is, etc).
>>
>> I can't promise I can fix it, but I will definitely take a good look at it
>> and will try to reproduce the problem on my systems. If we can ever find
>> a way to reliably reproduce these problems, then the ath9k developers will
>> have a much easier time fixing the problem.
>>
>> Thanks,
>> Ben
>>
>
> Attached. I even hit it with WMM and 11n disabled.
>
> I hit it with high speeds occurring - it took 5 cycles of hostapd for the syslog file to be scp'ed over (the complete file was 24Mb, though).

Ok, this is the first obvious error I see, and that FATAL interrupt looks bad, and my guess
is that the IRQ problem is the root cause.

This is caused by the AR_INTR_SYNC_HOST1_FATAL interrupt, but I don't have any idea what can cause that
interrupt, and I don't have access to any of the datasheets for ath9k chips.  Maybe one
of the ath9k devs has some ideas on this?

I am not sure I have a NIC with your chipset.
Can you let me know the exact brand & part number of your NIC.


Jan 27 19:06:38 jadis kernel: ath: received PCI FATAL interrupt
Jan 27 19:06:38 jadis kernel: ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
Jan 27 19:06:38 jadis kernel: ath: Could not stop RX, we could be confusing the DMA engine when we start RX up
Jan 27 19:06:38 jadis kernel: ------------[ cut here ]------------
Jan 27 19:06:38 jadis kernel: WARNING: at drivers/net/wireless/ath/ath9k/recv.c:528 ath_stoprecv+0xbc/0xe0 [ath9k]()
Jan 27 19:06:38 jadis kernel: Hardware name: 8366-8233
Jan 27 19:06:38 jadis kernel: Modules linked in: cryptd aes_i586 aes_generic ip6table_filter tun xt_CHECKSUM xt_TCPMSS act_police cls_flow cls_fw cls_u32 
sch_tbf sch_prio sch_htb sch_hfsc sch_ingress sch_sfq xt_time xt_connlimit xt_realm xt_addrtype iptable_raw xt_comment xt_recent xt_policy ipt_ULOG ipt_REDIRECT 
ipt_NETMAP ipt_MASQUERADE ipt_ECN ipt_ecn ipt_CLUSTERIP ipt_ah xt_set ip_set nf_nat_tftp nf_nat_snmp_basic nf_conntrack_snmp nf_nat_sip nf_nat_pptp 
nf_nat_proto_gre nf_nat_irc nf_nat_h323 nf_nat_ftp nf_nat_amanda ts_kmp nf_conntrack_amanda nf_conntrack_sane nf_conntrack_tftp nf_conntrack_sip 
nf_conntrack_proto_sctp nf_conntrack_pptp nf_conntrack_proto_gre nf_conntrack_netlink nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_irc 
nf_conntrack_h323 nf_conntrack_ftp xt_TPROXY nf_tproxy_core ip6_tables nf_defrag_ipv6 xt_tcpmss xt_pkttype xt_physdev xt_owner xt_NFQUEUE xt_NFLOG nfnetlink_log 
xt_multiport xt_mark xt_mac xt_limit xt_length xt_iprange xt_helper xt_hashlimit xt_DSCP xt_dscp xt_dccp xt
Jan 27 19:06:38 jadis kernel: _connmark xt_CLASSIFY xt_AUDIT ipt_LOG iptable_nat nf_nat iptable_mangle nfnetlink sit tunnel4 reiserfs bridge ipv6 stp llc arc4 
snd_cs4236 snd_wss_lib snd_via82xx snd_ac97_codec snd_opl3_lib ppdev snd_hwdep ac97_bus ath9k snd_pcm mac80211 snd_timer ath9k_common ath9k_hw snd_page_alloc 
snd_mpu401 i2c_viapro snd_mpu401_uart snd_rawmidi ath via_ircc snd_seq_device irda snd cfg80211 soundcore crc_ccitt ns558 gameport parport_pc hwmon_vid hwmon lp 
parport 8139too ata_generic pata_acpi 8139cp sundance pata_via sata_sil mii floppy raid10 raid456 async_raid6_recov async_pq raid6_pq async_xor xor async_memcpy 
async_tx raid1 raid0 multipath linear
Jan 27 19:06:38 jadis kernel: Pid: 4298, comm: java Not tainted 3.0.18-sune-1 #3
Jan 27 19:06:38 jadis kernel: Call Trace:
Jan 27 19:06:38 jadis kernel: [<c0431086>] warn_slowpath_common+0x63/0x78
Jan 27 19:06:38 jadis kernel: [<f851eaab>] ? ath_stoprecv+0xbc/0xe0 [ath9k]
Jan 27 19:06:38 jadis kernel: [<c04310aa>] warn_slowpath_null+0xf/0x13
Jan 27 19:06:38 jadis kernel: [<f851eaab>] ath_stoprecv+0xbc/0xe0 [ath9k]
Jan 27 19:06:38 jadis kernel: [<f851d782>] ath_reset+0x64/0x17c [ath9k]
Jan 27 19:06:38 jadis kernel: [<c07771e1>] ? _raw_spin_unlock_irqrestore+0x12/0x15
Jan 27 19:06:38 jadis kernel: [<f851d9ef>] ath9k_tasklet+0x27/0x133 [ath9k]
Jan 27 19:06:38 jadis kernel: [<c0435308>] tasklet_action+0x65/0xa7
Jan 27 19:06:38 jadis kernel: [<c04355e0>] __do_softirq+0x6c/0xe6
Jan 27 19:06:38 jadis kernel: [<c0435574>] ? local_bh_enable+0xa/0xa
Jan 27 19:06:38 jadis kernel: <IRQ>  [<c04357b8>] ? irq_exit+0x35/0x84
Jan 27 19:06:38 jadis kernel: [<c0403a78>] ? do_IRQ+0x6c/0x80
Jan 27 19:06:38 jadis kernel: [<c077be69>] ? common_interrupt+0x29/0x30
Jan 27 19:06:38 jadis kernel: ---[ end trace 46bdcea34024800a ]---
Jan 27 19:06:38 jadis kernel: ath: Failed to stop TX DMA!
Jan 27 19:06:38 jadis kernel: ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
Jan 27 19:06:38 jadis kernel: ath: Could not stop RX, we could be confusing the DMA engine when we start RX up
Jan 27 19:06:38 jadis kernel: ath: Failed to stop TX DMA!
....

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com