[10.1.467.2-1] No SSID in the air

Tue Aug 11 15:48:25 PDT 2015

I have an issue with 10.1.467.2-1 firmware - SSID disappears from the
air within a few hours from the launch of an access-point software.
I'm using OpenWrt 15.05-rc3 as an OS and a QCA9880 v2 based WiFi adapter.

There are repeating messages in the system console:

[324035.117841] ath10k_warn: 50 callbacks suppressed
[324035.126637] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[324035.220322] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[324035.322824] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[324035.425270] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[324035.527811] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[324035.630281] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[324035.712817] ath10k_pci 0000:00:05.0: Spurious quick kickout for
STA xx:xx:xx:xx:xx:xx
[324035.721568] ath10k_pci 0000:00:05.0: Spurious quick kickout for
STA yy:yy:yy:yy:yy:yy
[324035.732879] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[324035.835361] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
...

Then I changed firmware to the Candelatech's
firmware-2-ct-full-community.bin (it's beta-15, I think). It's working
for a day, but there's the following output in the console:

[15331.556099] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15331.658618] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15331.761139] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15331.863636] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15331.966167] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15332.068767] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15332.171227] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15332.273745] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15332.376242] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15332.478767] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15334.401723] ------------[ cut here ]------------
[15334.405688] WARNING: CPU: 0 PID: 1699 at
/home/buildbot/slave-local/x86_64/build/build_dir/target-x86_64_uClibc-0.9.33.2/linux-x86_64/compat-wireless-2015-03-09/net/mac80211/sta_info.c:909
sta_set_sinfo+0x659/0x710 [mac80211]()
[15334.421678] Modules linked in: pppoe ppp_async iptable_nat pppox
ppp_generic nf_nat_ipv4 nf_conntrack_ipv6 nf_conntrack_ipv4 ipt_REJECT
ipt_MASQUERADE xt_time xt_tcpudp xt_tcpmss xt_statistic xt_state
xt_recent xt_nat xt_multiport xt_mark xt_mac xt_limit xt_length xt_id
xt_hl xt_helper xt_ecn xt_dscp xt_conntrack xt_connmark xt_connlimit
xt_connbytes xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_HL xt_DSCP
xt_CT xt_CLASSIFY slhc r8169 nf_reject_ipv4 nf_nat_masquerade_ipv4
nf_nat_ftp nf_nat nf_log_ipv4 nf_defrag_ipv6 nf_defrag_ipv4
nf_conntrack_rtcache nf_conntrack_ftp iptable_raw iptable_mangle
iptable_filter ipt_ECN ip_tables e1000e crc_ccitt act_connmark
nf_conntrack act_skbedit act_mirred em_u32 cls_u32 cls_tcindex
cls_flow cls_route cls_fw sch_hfsc sch_ingress ath10k_pci ath10k_core
ath mac80211 cfg80211 compat ip6t_REJECT nf_reject_ipv6 nf_log_ipv6
nf_log_common ip6table_raw ip6table_mangle ip6table_filter ip6_tables
x_tables e1000 ifb ipv6 arc4 crypto_blkcipher ptp pps_core mii
[15334.508476] CPU: 0 PID: 1699 Comm: hostapd Not tainted 3.18.17 #1
[15334.513515]  0000000000000000 0000000000000009 ffffffff813df544
0000000000000000
[15334.520310]  ffffffff8103d29d ffff88000e6bc000 ffff88000e788d40
ffff88000ecfb730
[15334.527151]  ffff88000e6b2740 0000000000000000 ffffffffa00fcb39
ffff88000e70a1c0
[15334.534096] Call Trace:
[15334.536241]  [<ffffffff813df544>] ? dump_stack+0x41/0x51
[15334.540543]  [<ffffffff8103d29d>] ? warn_slowpath_common+0x6d/0x90
[15334.545642]  [<ffffffffa00fcb39>] ? sta_set_sinfo+0x659/0x710 [mac80211]
[15334.551094]  [<ffffffffa00fcc11>] ? __sta_info_destroy+0x21/0x30 [mac80211]
[15334.556819]  [<ffffffffa00fcca2>] ?
sta_info_destroy_addr_bss+0x32/0x50 [mac80211]
[15334.563075]  [<ffffffffa00c17c8>] ?
cfg80211_check_station_change+0xba8/0xf30 [cfg80211]
[15334.569613]  [<ffffffff8135ccc5>] ? genl_family_rcv_msg+0x285/0x300
[15334.574774]  [<ffffffff8135cdb5>] ? genl_rcv_msg+0x75/0xa0
[15334.579250]  [<ffffffff8135cd40>] ? genl_family_rcv_msg+0x300/0x300
[15334.584410]  [<ffffffff8135c12d>] ? netlink_rcv_skb+0x3d/0x90
[15334.589021]  [<ffffffff8135ca2f>] ? genl_rcv+0x1f/0x30
[15334.593408]  [<ffffffff8135bab9>] ? netlink_unicast+0x119/0x200
[15334.596826]  [<ffffffff8135bf67>] ? netlink_sendmsg+0x347/0x3c0
[15334.599640]  [<ffffffff8131f313>] ? sock_sendmsg+0x63/0x80
[15334.602322]  [<ffffffff81320e72>] ? move_addr_to_kernel+0x22/0x40
[15334.605156]  [<ffffffff8132cae8>] ? verify_iovec+0x58/0xc0
[15334.607751]  [<ffffffff81320a47>] ? ___sys_sendmsg.part.34+0x207/0x230
[15334.610810]  [<ffffffff81320ba1>] ? ___sys_recvmsg.part.35+0x131/0x180
[15334.613934]  [<ffffffff81060656>] ? pick_next_task_fair+0x126/0x3f0
[15334.616871]  [<ffffffff810f5a7f>] ? __inode_wait_for_writeback+0x5f/0xa0
[15334.620019]  [<ffffffff811071b2>] ? fsnotify_clear_marks_by_inode+0x22/0x120
[15334.623347]  [<ffffffff81320046>] ? sock_destroy_inode+0x16/0x30
[15334.626162]  [<ffffffff810e7a48>] ? __dentry_kill+0x168/0x1a0
[15334.628894]  [<ffffffff810e7bb1>] ? dput+0x131/0x160
[15334.631256]  [<ffffffff810d55ec>] ? __fput+0x17c/0x1b0
[15334.633777]  [<ffffffff813219a6>] ? __sys_sendmsg+0x46/0x70
[15334.636419]  [<ffffffff813e39c9>] ? system_call_fastpath+0x12/0x17
[15334.639351] ---[ end trace 97da1af6d0d2e5cb ]---
[15336.682094] ath10k_warn: 41 callbacks suppressed
[15336.682887] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15336.784608] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15336.887139] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15336.989644] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15337.092180] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15337.194685] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15337.297223] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15337.399746] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15337.502271] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[15337.604789] ath10k_pci 0000:00:05.0: SWBA overrun on vdev 0,
skipped old beacon
[18934.163332] ath10k_warn: 22 callbacks suppressed
[18934.166516] ath10k_pci 0000:00:05.0: Spurious quick kickout for STA
zz:zz:zz:zz:zz:zz
[29356.544292] CE: hpet2 increased min_delta_ns to 28800 nsec
[29356.544584] CE: hpet2 increased min_delta_ns to 43200 nsec
[29356.544850] CE: hpet2 increased min_delta_ns to 64800 nsec
[71227.201511] CE: hpet2 increased min_delta_ns to 97200 nsec
[71227.201945] CE: hpet2 increased min_delta_ns to 145800 nsec

However, it's still working.

I'll be glad to get help in regard to this issue.