#11862: ath: Failed to stop TX DMA, queues=0x004
------------------------------+---------------------------------------
Reporter: igor@… | Owner: nbd
Type: defect | Status: assigned
Priority: response-needed | Milestone: Attitude Adjustment 12.09
Component: kernel | Version: Trunk
Resolution: | Keywords:
------------------------------+---------------------------------------
Comment (by anonymous):
I added the tcpdump capture running on r41296.
My behavior is now different. NO TX DMA errors so far. Now the wlan0
interface switches from 40MHz operation to 20 MHz without any error. For
me, the switching from 40 to 20mhz is still common among all builds which
have the problem.
No errors in r40948, however everything I have built from r41055 and
onwards, has had these issues. Can't say anything for changes between
r40948 and r41055 ( have not tested them).
The problem is very easy for me to replicate. I have a Notebook PC with an
AR9285 802.11bgn card (150mbps max) which when connecting to the AP
broadcasting at 40MHz mode, brings down the operation to 20MHz mode.
Again, for me this is happening since r41055. This error log is running
r41296. Last error free build for me was r40948.
Hopefully the tcpdumps can help in getting to the bottom of the issue.
Here are the kernel and system logs respectively:
{{{
[ 189.770000] ------------[ cut here ]------------
[ 189.770000] WARNING: at /home/chirag/bb/mynet/build_dir/target-
mips_34kc_uClibc-0.9.33.2/linux-ar71xx_generic/compat-
wireless-2014-05-22/net/mac80211/chan.c:535
ieee80211_recalc_chanctx_min_def+0x4f8/0x6c4 [mac80211]()
[ 189.790000] Modules linked in: ath9k ath9k_common pppoe ppp_async
iptable_nat ath9k_hw ath pppox ppp_generic nf_nat_ipv4 nf_conntrack_ipv4
mac80211 ipt_MASQUERADE cfg80211 xt_time xt_tcpudp xt_state xt_nat
xt_multiport xt_mark xt_mac xt_limit xt_conntrack xt_comment xt_TCPMSS
xt_REDIRECT xt_LOG xt_CT ums_usbat ums_sddr55 ums_sddr09 ums_karma
ums_jumpshot ums_isd200 ums_freecom ums_datafab ums_cypress ums_alauda
slhc nf_nat_irc nf_nat_ftp nf_nat nf_defrag_ipv4 nf_conntrack_irc
nf_conntrack_ftp iptable_raw iptable_mangle iptable_filter ipt_REJECT
ip_tables crc_ccitt compat fuse sg ledtrig_usbdev ip6t_REJECT ip6table_raw
ip6table_mangle ip6table_filter ip6_tables x_tables nf_conntrack_ipv6
nf_conntrack nf_defrag_ipv6 vfat fat ntfs nls_utf8 nls_iso8859_1 nls_cp850
nls_cp437 ipv6 arc4 crypto_blkcipher usb_storage uhci_hcd ohci_hcd
ehci_platform ehci_hcd sd_mod scsi_mod gpio_button_hotplug ext4 crc16 jbd2
mbcache usbcore nls_base usb_common crypto_hash
[ 189.890000] CPU: 0 PID: 2176 Comm: hostapd Not tainted 3.10.36 #2
[ 189.890000] Stack : 00000000 00000000 00000000 00000000 80362eba
00000035 86f6c5d8 87229274
[ 189.890000] 802bb240 8030921b 00000880 80362664 86f6c5d8 87229274
86ed9b88 0000002c
[ 189.890000] 875496e0 80078f34 00000003 800769b4 8734bdd0 87229274
802bcb00 86ed9a7c
[ 189.890000] 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000
[ 189.890000] 00000000 00000000 00000000 00000000 00000000 00000000
00000000 86ed9a08
[ 189.890000] ...
[ 189.930000] Call Trace:
[ 189.930000] [<8006e200>] show_stack+0x48/0x70
[ 189.940000] [<80076ab0>] warn_slowpath_common+0x78/0xa8
[ 189.950000] [<80076b68>] warn_slowpath_null+0x18/0x24
[ 189.950000] [<8732b464>] ieee80211_recalc_chanctx_min_def+0x4f8/0x6c4
[mac80211]
[ 189.960000]
[ 189.960000] ---[ end trace 6f2a8844e1cf1894 ]---
}}}
{{{
Sun Jun 22 02:38:24 2014 daemon.info hostapd: wlan0: STA 4c:xx:xx:xx:xx:xx
IEEE 802.11: Switching to 20 MHz operation
Sun Jun 22 02:38:24 2014 kern.warn kernel: [ 189.770000] ------------[
cut here ]------------
Sun Jun 22 02:38:24 2014 kern.warn kernel: [ 189.770000] WARNING: at
/home/chirag/bb/mynet/build_dir/target-mips_34kc_uClibc-0.9.33.2/linux-
ar71xx_generic/compat-wireless-2014-05-22/net/mac80211/chan.c:535
ieee80211_recalc_chanctx_min_def+0x4f8/0x6c4 [mac80211]()
Sun Jun 22 02:38:24 2014 kern.warn kernel: [ 189.790000] Modules linked
in: ath9k ath9k_common pppoe ppp_async iptable_nat ath9k_hw ath pppox
ppp_generic nf_nat_ipv4 nf_conntrack_ipv4 mac80211 ipt_MASQUERADE cfg80211
xt_time xt_tcpudp xt_state xt_nat xt_multiport xt_mark xt_mac xt_limit
xt_conntrack xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_CT ums_usbat
ums_sddr55 ums_sddr09 ums_karma ums_jumpshot ums_isd200 ums_freecom
ums_datafab ums_cypress ums_alauda slhc nf_nat_irc nf_nat_ftp nf_nat
nf_defrag_ipv4 nSun Jun 22 02:38:24 2014 kern.warn kernel: [ 189.890000]
CPU: 0 PID: 2176 Comm: hostapd Not tainted 3.10.36 #2
Sun Jun 22 02:38:24 2014 kern.warn kernel: [ 189.890000] Stack : 00000000
00000000 00000000 00000000 80362eba 00000035 86f6c5d8 87229274
Sun Jun 22 02:38:24 2014 kern.warn kernel: [ 189.890000] 802bb240
8030921b 00000880 80362664 86f6c5d8 87229274 86ed9b88 0000002c
Sun Jun 22 02:38:24 2014 kern.warn kernel: [ 189.890000] 875496e0
80078f34 00000003 800769b4 8734bdd0 87229274 802bcb00 86ed9a7c
Sun Jun 22 02:38:24 2014 kern.warn kernel: [ 189.890000] 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000
Sun Jun 22 02:38:24 2014 kern.warn kernel: [ 189.890000] 00000000
00000000 00000000 00000000 00000000 00000000 00000000 86ed9a08
Sun Jun 22 02:38:24 2014 kern.warn kernel: [ 189.890000] ...
Sun Jun 22 02:38:24 2014 kern.warn kernel: [ 189.930000] Call Trace:
Sun Jun 22 02:38:24 2014 kern.warn kernel: [ 189.930000] [<8006e200>]
show_stack+0x48/0x70
Sun Jun 22 02:38:24 2014 kern.warn kernel: [ 189.940000] [<80076ab0>]
warn_slowpath_common+0x78/0xa8
Sun Jun 22 02:38:24 2014 kern.warn kernel: [ 189.950000] [<80076b68>]
warn_slowpath_null+0x18/0x24
Sun Jun 22 02:38:24 2014 kern.warn kernel: [ 189.950000] [<8732b464>]
ieee80211_recalc_chanctx_min_def+0x4f8/0x6c4 [mac80211]
Sun Jun 22 02:38:24 2014 kern.warn kernel: [ 189.960000]
Sun Jun 22 02:38:24 2014 kern.warn kernel: [ 189.960000] ---[ end trace
6f2a8844e1cf1894 ]---
}}}
--
Ticket URL: <https://dev.openwrt.org/ticket/11862#comment:240>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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