Re: [Make-wifi-fast] [PATCH RFC v4 3/4] mac80211: Add airtime accounting and scheduling to TXQs

[Rajkumar Manoharan <rmanohar@codeaurora.org>]

[-- Attachment #1: Type: text/plain, Size: 721 bytes --]

On 2018-10-02 01:22, Toke Høiland-Jørgensen wrote:
> Rajkumar Manoharan <rmanohar@codeaurora.org> writes:
> 
>>> Great! I'll fold in the rest, test it with ath9k and submit as a 
>>> proper
>>> patch :)
>>> 
>> Toke,
>> 
>> I noticed a race condition b/w sta cleanup and kick_airtime tasklet.
>> How do you plan to exit kick_airtime gracefully during sta_cleanup?
> 
> Ah, right, there's a lot of stuff going on before we get to purge_txq.
> Hmm, I guess we should either make sure we remove the station from
> active_txqs earlier in the sta cleanup process, or maybe it'd enough to
> just check the removed flag in the tasklet?
> 
> Does the below patch fix the issue?
> 

No. Attaching backtrace. Any clue?

-Rajkumar

[-- Attachment #2: sta_remove.txt --]
[-- Type: text/plain, Size: 16773 bytes --]

[  612.084685] INFO: rcu_preempt self-detected stall on CPU { 0}  (t=2101 jiffie
s g=3643 c=3642 q=107)
[  612.092689] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.77 #9
[  612.094702] INFO: rcu_preempt detected stalls on CPUs/tasks: { 0} (detected b
y 1, t=2102 jiffies, g=3643, c=3642, q=107)
[  612.094705] Task dump for CPU 0:
[  612.094716] swapper/0       R running      0     0      0 0x00001002
[  612.094745] [<c020ec20>] (__schedule) from [<c0218304>] (arch_cpu_idle+0x38/0
x5c)
[  612.094834] [<c0218304>] (arch_cpu_idle) from [<ffffffff>] (0xffffffff)
[  612.133149] [<c021d9ac>] (unwind_backtrace) from [<c021aa40>] (show_stack+0x1
0/0x14)
[  612.140874] [<c021aa40>] (show_stack) from [<c03c59d4>] (dump_stack+0x80/0xa0
)
[  612.148079] [<c03c59d4>] (dump_stack) from [<c026e1dc>] (rcu_check_callbacks+
0x230/0x6a8)
[  612.156239] [<c026e1dc>] (rcu_check_callbacks) from [<c0238814>] (update_proc
ess_times+0x38/0x58)
[  612.165092] [<c0238814>] (update_process_times) from [<c0276780>] (tick_sched
_timer+0x44/0x74)
[  612.173683] [<c0276780>] (tick_sched_timer) from [<c024a828>] (__run_hrtimer+
0x50/0xc8)
[  612.181668] [<c024a828>] (__run_hrtimer) from [<c024aff8>] (hrtimer_interrupt
+0x130/0x27c)
[  612.189917] [<c024aff8>] (hrtimer_interrupt) from [<c05175ac>] (msm_timer_int
errupt+0x38/0x44)
[  612.198510] [<c05175ac>] (msm_timer_interrupt) from [<c0268a6c>] (handle_perc
pu_devid_irq+0x68/0x84)
[  612.207625] [<c0268a6c>] (handle_percpu_devid_irq) from [<c02653e0>] (generic
_handle_irq+0x20/0x30)
[  612.216653] [<c02653e0>] (generic_handle_irq) from [<c021803c>] (handle_IRQ+0
x68/0x90)
[  612.224548] [<c021803c>] (handle_IRQ) from [<c02084e0>] (gic_handle_irq+0x3c/
0x60)
[  612.232101] [<c02084e0>] (gic_handle_irq) from [<c02095c0>] (__irq_svc+0x40/0
x70)
[  612.239562] Exception stack(0xc085de68 to 0xc085deb0)
[  612.244597] de60:                   00000000 d65490a0 00000000 00000010 d4d20
d18 d4d20d00
[  612.252758] de80: d4d20c20 00000002 00000030 00000018 d6549000 00000006 00000
000 c085deb0
[  612.260917] dea0: bf84bc94 c020cb24 60000113 ffffffff
[  612.265959] [<c02095c0>] (__irq_svc) from [<c020cb24>] (_test_and_clear_bit+0
x3c/0x48)
[  612.273915] [<c020cb24>] (_test_and_clear_bit) from [<bf84bc94>] (ieee80211_k
ick_airtime+0x90/0x1a8 [mac80211])
[  612.284028] [<bf84bc94>] (ieee80211_kick_airtime [mac80211]) from [<c02331ec>
] (tasklet_action+0x8c/0xec)
[  612.293474] [<c02331ec>] (tasklet_action) from [<c02327e4>] (__do_softirq+0x1
04/0x294)
[  612.301370] [<c02327e4>] (__do_softirq) from [<c0232c60>] (irq_exit+0x9c/0x11
c)
[  612.308663] [<c0232c60>] (irq_exit) from [<c0218040>] (handle_IRQ+0x6c/0x90)
[  612.315695] [<c0218040>] (handle_IRQ) from [<c02084e0>] (gic_handle_irq+0x3c/
0x60)
[  612.323244] [<c02084e0>] (gic_handle_irq) from [<c02095c0>] (__irq_svc+0x40/0
x70)
[  612.330706] Exception stack(0xc085df60 to 0xc085dfa8)
[  612.335744] df60: ffffffed 00000000 1d3c2000 c020a040 c085c000 c085c030 fffff
fff c08b3014
[  612.343903] df80: c08643c0 c08539c8 ddffcc80 c08b3010 c086d288 c085dfa8 c0218
300 c0218304
[  612.352061] dfa0: 60000013 ffffffff
[  612.355539] [<c02095c0>] (__irq_svc) from [<c0218304>] (arch_cpu_idle+0x38/0x
5c)
[  612.362918] [<c0218304>] (arch_cpu_idle) from [<c026534c>] (cpu_startup_entry
+0xa4/0x108)
[  612.371084] [<c026534c>] (cpu_startup_entry) from [<c0832af0>] (start_kernel+
0x358/0x3cc)
[  632.204687] BUG: soft lockup - CPU#1 stuck for 22s! [nmbd:1458]
[  632.209569] Modules linked in: ath10k_pci ath10k_core ath mac80211 cfg80211 c
ompat ecm iptable_nat nf_nat_pptp nf_nat_ipv4 nf_nat_amanda nf_conntrack_pptp nf
_conntrack_ipv6 nf_conntrack_ipv4 nf_conntrack_amanda xt_time xt_tcpudp xt_tcpms
s xt_string xt_statistic xt_state xt_recent xt_quota xt_policy xt_pkttype xt_phy
sdev xt_owner xt_nat xt_multiport xt_mark xt_mac xt_limit xt_length xt_hl xt_hel
per xt_esp xt_ecn xt_dscp xt_conntrack xt_connmark xt_connlimit xt_connbytes xt_
comment xt_addrtype xt_TCPMSS xt_REDIRECT xt_LOG xt_HL xt_DSCP xt_CT xt_CLASSIFY
 usbnet ts_kmp ts_fsm ts_bm r8152 pppoe ppp_mppe ppp_async nf_nat_tftp nf_nat_sn
mp_basic nf_nat_sip nf_nat_rtsp nf_nat_proto_gre nf_nat_irc nf_nat_h323 nf_nat_f
tp nf_defrag_ipv6 nf_defrag_ipv4 nf_conntrack_tftp nf_conntrack_snmp nf_conntrac
k_sip nf_conntrack_rtsp nf_conntrack_proto_gre nf_conntrack_irc nf_conntrack_h32
3 nf_conntrack_ftp nf_conntrack_broadcast l2tp_ppp iptable_raw iptable_mangle ip
table_filter ipt_ah ipt_REJECT ipt_MASQUERADE ipt_ECN ip_tables crc_ccitt arptab
le_filter arpt_mangle arp_tables sch_teql sch_tbf sch_sfq sch_red sch_prio sch_p
ie sch_htb sch_gred sch_fq sch_dsmark sch_codel em_text em_nbyte em_meta em_cmp
cls_basic act_police act_ipt act_connmark act_skbedit act_mirred em_u32 cls_u32
cls_tcindex cls_flow cls_route cls_fw sch_hfsc sch_ingress qca_nss_ipsec qca_nss
_cfi_ocf qca_nss_tunipip6 qca_nss_tun6rd qca_nss_ipsecmgr qca_nss_cfi_cryptoapi
qca_nss_qdisc qca_nss_macsec qca_nss_crypto_tool qca_nss_crypto qca_nss_pptp ppt
p pppox qca_nss_map_t qca_nss_lag_mgr qca_nss_l2tpv2 ppp_generic slhc qca_nss_gr
e hyfi_bridging nf_nat_proto_sctp nf_nat libcrc32c ledtrig_usbdev nf_conntrack_p
roto_sctp essedma ip6t_REJECT ip6table_raw ip6table_mangle ip6table_filter ip6_t
ables x_tables qca_mcs qca_85xx_sw msdos bonding ip6_gre ip_gre gre ifb nat46 si
t qca_nss_drv l2tp_netlink l2tp_core ipcomp6 xfrm6_tunnel xfrm6_mode_tunnel xfrm
6_mode_transport xfrm6_mode_beet esp6 ah6 ipcomp xfrm4_tunnel xfrm4_mode_tunnel
xfrm4_mode_transport xfrm4_mode_beet esp4 ah4 ip6_tunnel qca_nss_gmac tunnel6 tu
nnel4 ip_tunnel snd_pcm_oss snd_mixer_oss snd_rawmidi snd_seq_device qca_ssdk af
_key xfrm_user xfrm_ipcomp xfrm_algo vfat fat ntfs qrfs nf_conntrack nls_iso8859
_1 nls_cp437 shortcut_fe_drv aq_phy shortcut_fe_ipv6 shortcut_fe sha1_generic qc
rypto cryptosoft cryptodev ocf md5 hmac ecb des_generic cbc authenc usb_storage
leds_gpio bootconfig xhci_hcd dwc3 udc_core dwc3_qcom dwc3_ipq40xx phy_qcom_ssus
b phy_qcom_hsusb phy_qca_uniphy phy_qca_baldur sd_mod ahci_platform gpio_button_
hotplug button_hotplug input_core usbcore nls_base usb_common mii [last unloaded
: compat]
[  632.439690]
[  632.441168] CPU: 1 PID: 1458 Comm: nmbd Not tainted 3.14.77 #9
[  632.446985] task: dcf5dc80 ti: d5ce4000 task.ti: d5ce4000
[  632.452369] PC is at _raw_spin_lock_bh+0x48/0x5c
[  632.457012] LR is at ieee80211_tx_dequeue+0x6e8/0x8ec [mac80211]
[  632.462956] pc : [<c0211fb4>]    lr : [<bf846224>]    psr: 20000013
[  632.462956] sp : d5ce5b20  ip : d4314038  fp : 00000000
[  632.474412] r10: d4d20cb4  r9 : d4d20ca8  r8 : d4d20cac
[  632.479622] r7 : 00000000  r6 : d6d17a80  r5 : d6997478  r4 : d4d20c20
[  632.486132] r3 : 0000d769  r2 : 0000d76a  r1 : 00000000  r0 : d4d20d00
[  632.492644] Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
[  632.499760] Control: 10c5787d  Table: 57c4c06a  DAC: 00000015
[  632.505490] CPU: 1 PID: 1458 Comm: nmbd Not tainted 3.14.77 #9
[  632.511317] [<c021d9ac>] (unwind_backtrace) from [<c021aa40>] (show_stack+0x1
0/0x14)
[  632.519040] [<c021aa40>] (show_stack) from [<c03c59d4>] (dump_stack+0x80/0xa0
)
[  632.526250] [<c03c59d4>] (dump_stack) from [<c028269c>] (watchdog_timer_fn+0x
10c/0x160)
[  632.534231] [<c028269c>] (watchdog_timer_fn) from [<c024a828>] (__run_hrtimer
+0x50/0xc8)
[  632.542301] [<c024a828>] (__run_hrtimer) from [<c024aff8>] (hrtimer_interrupt
+0x130/0x27c)
[  632.550550] [<c024aff8>] (hrtimer_interrupt) from [<c05175ac>] (msm_timer_int
errupt+0x38/0x44)
[  632.559143] [<c05175ac>] (msm_timer_interrupt) from [<c0268a6c>] (handle_perc
pu_devid_irq+0x68/0x84)
[  632.568259] [<c0268a6c>] (handle_percpu_devid_irq) from [<c02653e0>] (generic
_handle_irq+0x20/0x30)
[  632.577287] [<c02653e0>] (generic_handle_irq) from [<c021803c>] (handle_IRQ+0
x68/0x90)
[  632.585184] [<c021803c>] (handle_IRQ) from [<c02084e0>] (gic_handle_irq+0x3c/
0x60)
[  632.592734] [<c02084e0>] (gic_handle_irq) from [<c02095c0>] (__irq_svc+0x40/0
x70)
[  632.600193] Exception stack(0xd5ce5ad8 to 0xd5ce5b20)
[  632.605231] 5ac0:                                                       d4d20
d00 00000000
[  632.613392] 5ae0: 0000d76a 0000d769 d4d20c20 d6997478 d6d17a80 00000000 d4d20
cac d4d20ca8
[  632.621552] 5b00: d4d20cb4 00000000 d4314038 d5ce5b20 bf846224 c0211fb4 20000
013 ffffffff
[  632.629715] [<c02095c0>] (__irq_svc) from [<c0211fb4>] (_raw_spin_lock_bh+0x4
8/0x5c)
[  632.637487] [<c0211fb4>] (_raw_spin_lock_bh) from [<bf846224>] (ieee80211_tx_
dequeue+0x6e8/0x8ec [mac80211])
[  632.647339] [<bf846224>] (ieee80211_tx_dequeue [mac80211]) from [<bf846350>]
(ieee80211_tx_dequeue+0x814/0x8ec [mac80211])
[  632.658361] [<bf846350>] (ieee80211_tx_dequeue [mac80211]) from [<bf848c28>]
(ieee80211_subif_8023_start_xmit+0x314/0x35c [mac80211])
[  632.670302] [<bf848c28>] (ieee80211_subif_8023_start_xmit [mac80211]) from [<
c059bf40>] (dev_hard_start_xmit+0x320/0x454)
[  632.681192] [<c059bf40>] (dev_hard_start_xmit) from [<c059c3ec>] (__dev_queue
_xmit+0x378/0x454)
[  632.689877] [<c059c3ec>] (__dev_queue_xmit) from [<c0655eb8>] (br_dev_queue_p
ush_xmit+0xbc/0xc4)
[  632.698640] [<c0655eb8>] (br_dev_queue_push_xmit) from [<c0655df4>] (deliver_
clone+0x40/0x48)
[  632.707145] [<c0655df4>] (deliver_clone) from [<c06561e8>] (maybe_deliver+0x5
c/0x6c)
[  632.714870] [<c06561e8>] (maybe_deliver) from [<c0656284>] (br_flood+0x8c/0xf
c)
[  632.722162] [<c0656284>] (br_flood) from [<c06563e8>] (br_flood_deliver+0x18/
0x24)
[  632.729716] [<c06563e8>] (br_flood_deliver) from [<c06543c0>] (br_dev_xmit+0x
2a8/0x2c4)
[  632.737702] [<c06543c0>] (br_dev_xmit) from [<c059bf40>] (dev_hard_start_xmit
+0x320/0x454)
[  632.745947] [<c059bf40>] (dev_hard_start_xmit) from [<c059c3ec>] (__dev_queue
_xmit+0x378/0x454)
[  632.754635] [<c059c3ec>] (__dev_queue_xmit) from [<c05c9ef8>] (ip_finish_outp
ut+0x434/0x4a4)
[  632.763054] [<c05c9ef8>] (ip_finish_output) from [<c05cbdfc>] (ip_send_skb+0x
10/0x98)
[  632.770865] [<c05cbdfc>] (ip_send_skb) from [<c05ebe44>] (udp_send_skb+0x184/
0x234)
[  632.778503] [<c05ebe44>] (udp_send_skb) from [<c05ed464>] (udp_sendmsg+0x6bc/
0x6e4)
[  632.786143] [<c05ed464>] (udp_sendmsg) from [<c0584420>] (sock_sendmsg+0x70/0
x84)
[  632.793607] [<c0584420>] (sock_sendmsg) from [<c05867a4>] (SyS_sendto+0xe4/0x
128)
[  632.801070] [<c05867a4>] (SyS_sendto) from [<c0208c80>] (ret_fast_syscall+0x0
/0x44)
[  636.124678] BUG: soft lockup - CPU#0 stuck for 22s! [swapper/0:0]
[  636.129726] Modules linked in: ath10k_pci ath10k_core ath mac80211 cfg80211 c
ompat ecm iptable_nat nf_nat_pptp nf_nat_ipv4 nf_nat_amanda nf_conntrack_pptp nf
_conntrack_ipv6 nf_conntrack_ipv4 nf_conntrack_amanda xt_time xt_tcpudp xt_tcpms
s xt_string xt_statistic xt_state xt_recent xt_quota xt_policy xt_pkttype xt_phy
sdev xt_owner xt_nat xt_multiport xt_mark xt_mac xt_limit xt_length xt_hl xt_hel
per xt_esp xt_ecn xt_dscp xt_conntrack xt_connmark xt_connlimit xt_connbytes xt_
comment xt_addrtype xt_TCPMSS xt_REDIRECT xt_LOG xt_HL xt_DSCP xt_CT xt_CLASSIFY
 usbnet ts_kmp ts_fsm ts_bm r8152 pppoe ppp_mppe ppp_async nf_nat_tftp nf_nat_sn
mp_basic nf_nat_sip nf_nat_rtsp nf_nat_proto_gre nf_nat_irc nf_nat_h323 nf_nat_f
tp nf_defrag_ipv6 nf_defrag_ipv4 nf_conntrack_tftp nf_conntrack_snmp nf_conntrac
k_sip nf_conntrack_rtsp nf_conntrack_proto_gre nf_conntrack_irc nf_conntrack_h32
3 nf_conntrack_ftp nf_conntrack_broadcast l2tp_ppp iptable_raw iptable_mangle ip
table_filter ipt_ah ipt_REJECT ipt_MASQUERADE ipt_ECN ip_tables crc_ccitt arptab
le_filter arpt_mangle arp_tables sch_teql sch_tbf sch_sfq sch_red sch_prio sch_p
ie sch_htb sch_gred sch_fq sch_dsmark sch_codel em_text em_nbyte em_meta em_cmp
cls_basic act_police act_ipt act_connmark act_skbedit act_mirred em_u32 cls_u32
cls_tcindex cls_flow cls_route cls_fw sch_hfsc sch_ingress qca_nss_ipsec qca_nss
_cfi_ocf qca_nss_tunipip6 qca_nss_tun6rd qca_nss_ipsecmgr qca_nss_cfi_cryptoapi
qca_nss_qdisc qca_nss_macsec qca_nss_crypto_tool qca_nss_crypto qca_nss_pptp ppt
p pppox qca_nss_map_t qca_nss_lag_mgr qca_nss_l2tpv2 ppp_generic slhc qca_nss_gr
e hyfi_bridging nf_nat_proto_sctp nf_nat libcrc32c ledtrig_usbdev nf_conntrack_p
roto_sctp essedma ip6t_REJECT ip6table_raw ip6table_mangle ip6table_filter ip6_t
ables x_tables qca_mcs qca_85xx_sw msdos bonding ip6_gre ip_gre gre ifb nat46 si
t qca_nss_drv l2tp_netlink l2tp_core ipcomp6 xfrm6_tunnel xfrm6_mode_tunnel xfrm
6_mode_transport xfrm6_mode_beet esp6 ah6 ipcomp xfrm4_tunnel xfrm4_mode_tunnel
xfrm4_mode_transport xfrm4_mode_beet esp4 ah4 ip6_tunnel qca_nss_gmac tunnel6 tu
nnel4 ip_tunnel snd_pcm_oss snd_mixer_oss snd_rawmidi snd_seq_device qca_ssdk af
_key xfrm_user xfrm_ipcomp xfrm_algo vfat fat ntfs qrfs nf_conntrack nls_iso8859
_1 nls_cp437 shortcut_fe_drv aq_phy shortcut_fe_ipv6 shortcut_fe sha1_generic qc
rypto cryptosoft cryptodev ocf md5 hmac ecb des_generic cbc authenc usb_storage
leds_gpio bootconfig xhci_hcd dwc3 udc_core dwc3_qcom dwc3_ipq40xx phy_qcom_ssus
b phy_qcom_hsusb phy_qca_uniphy phy_qca_baldur sd_mod ahci_platform gpio_button_
hotplug button_hotplug input_core usbcore nls_base usb_common mii [last unloaded
: compat]
[  636.359847]
[  636.361324] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.77 #9
[  636.367314] task: c0868750 ti: c085c000 task.ti: c085c000
[  636.372723] PC is at ieee80211_kick_airtime+0x7c/0x1a8 [mac80211]
[  636.378798] LR is at ieee80211_kick_airtime+0x90/0x1a8 [mac80211]
[  636.384848] pc : [<bf84bc80>]    lr : [<bf84bc94>]    psr: 20000113
[  636.384848] sp : c085deb0  ip : 00000000  fp : 00000006
[  636.396306] r10: d6549000  r9 : 00000018  r8 : 00000030
[  636.401514] r7 : 00000002  r6 : d4d20c20  r5 : d4d20d00  r4 : d4d20d18
[  636.408025] r3 : 00000000  r2 : 000000b9  r1 : 00000001  r0 : 00000000
[  636.414536] Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kern
el
[  636.421827] Control: 10c5787d  Table: 586cc06a  DAC: 00000015
[  636.427557] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.77 #9
[  636.433552] [<c021d9ac>] (unwind_backtrace) from [<c021aa40>] (show_stack+0x1
0/0x14)
[  636.441276] [<c021aa40>] (show_stack) from [<c03c59d4>] (dump_stack+0x80/0xa0
)
[  636.448482] [<c03c59d4>] (dump_stack) from [<c028269c>] (watchdog_timer_fn+0x
10c/0x160)
[  636.456468] [<c028269c>] (watchdog_timer_fn) from [<c024a828>] (__run_hrtimer
+0x50/0xc8)
[  636.464539] [<c024a828>] (__run_hrtimer) from [<c024aff8>] (hrtimer_interrupt
+0x130/0x27c)
[  636.472787] [<c024aff8>] (hrtimer_interrupt) from [<c05175ac>] (msm_timer_int
errupt+0x38/0x44)
[  636.481380] [<c05175ac>] (msm_timer_interrupt) from [<c0268a6c>] (handle_perc
pu_devid_irq+0x68/0x84)
[  636.490495] [<c0268a6c>] (handle_percpu_devid_irq) from [<c02653e0>] (generic
_handle_irq+0x20/0x30)
[  636.499524] [<c02653e0>] (generic_handle_irq) from [<c021803c>] (handle_IRQ+0
x68/0x90)
[  636.507422] [<c021803c>] (handle_IRQ) from [<c02084e0>] (gic_handle_irq+0x3c/
0x60)
[  636.514972] [<c02084e0>] (gic_handle_irq) from [<c02095c0>] (__irq_svc+0x40/0
x70)
[  636.522436] Exception stack(0xc085de68 to 0xc085deb0)
[  636.527471] de60:                   00000000 00000001 000000b9 00000000 d4d20
d18 d4d20d00
[  636.535631] de80: d4d20c20 00000002 00000030 00000018 d6549000 00000006 00000
000 c085deb0
[  636.543791] dea0: bf84bc94 bf84bc80 20000113 ffffffff
[  636.548854] [<c02095c0>] (__irq_svc) from [<bf84bc80>] (ieee80211_kick_airtim
e+0x7c/0x1a8 [mac80211])
[  636.558056] [<bf84bc80>] (ieee80211_kick_airtime [mac80211]) from [<c02331ec>
] (tasklet_action+0x8c/0xec)
[  636.567578] [<c02331ec>] (tasklet_action) from [<c02327e4>] (__do_softirq+0x1
04/0x294)
[  636.575477] [<c02327e4>] (__do_softirq) from [<c0232c60>] (irq_exit+0x9c/0x11
c)
[  636.582770] [<c0232c60>] (irq_exit) from [<c0218040>] (handle_IRQ+0x6c/0x90)
[  636.589800] [<c0218040>] (handle_IRQ) from [<c02084e0>] (gic_handle_irq+0x3c/
0x60)
[  636.597351] [<c02084e0>] (gic_handle_irq) from [<c02095c0>] (__irq_svc+0x40/0
x70)
[  636.604813] Exception stack(0xc085df60 to 0xc085dfa8)
[  636.609851] df60: ffffffed 00000000 1d3c2000 c020a040 c085c000 c085c030 fffff
fff c08b3014
[  636.618009] df80: c08643c0 c08539c8 ddffcc80 c08b3010 c086d288 c085dfa8 c0218
300 c0218304
[  636.626167] dfa0: 60000013 ffffffff
[  636.629644] [<c02095c0>] (__irq_svc) from [<c0218304>] (arch_cpu_idle+0x38/0x
5c)
[  636.637024] [<c0218304>] (arch_cpu_idle) from [<c026534c>] (cpu_startup_entry
+0xa4/0x108)
[  636.645184] [<c026534c>] (cpu_startup_entry) from [<c0832af0>] (start_kernel+
0x358/0x3cc)