OpenWrt 19.07.2 ,The system crashes after a period of wifi relay

[113407.483787] Data bus error, epc == 8014fe20, ra == 8014fe20
[113407.489649] Oops[#1]:
[113407.492086] CPU: 0 PID: 9896 Comm: sh Not tainted 4.14.171 #0
[113407.498112] task: 87de72a0 task.stack: 86b12000
[113407.502875] $ 0   : 00000000 0045dccf 86fd4000 86fd2000
[113407.508366] $ 4   : 81109070 00000001 02d4d8f6 02d4d8f7
[113407.513858] $ 8   : 00000000 875ec000 00000010 2d6d6970
[113407.519352] $12   : 8788758c 00000040 00000009 00000000
[113407.524844] $16   : 86f14980 0000001a 01400000 80510000
[113407.530336] $20   : 86f14d80 fffffff8 00000001 80510000
[113407.535828] $24   : 00000010 8007b730                  
[113407.541321] $28   : 86b12000 86b13d90 86b13dd8 8014fe20
[113407.546815] Hi    : 00000006
[113407.549879] Lo    : 0000003d
[113407.552965] epc   : 8014fe20 getname_kernel+0x3c/0xf4
[113407.558270] ra    : 8014fe20 getname_kernel+0x3c/0xf4
[113407.563570] Status: 1000fc03	KERNEL EXL IE 
[113407.567979] Cause : 5080841c (ExcCode 07)
[113407.572208] PrId  : 00019374 (MIPS 24Kc)
[113407.576346] Modules linked in: ath9k ath9k_common rt2800usb rt2800lib pppoe ppp_async option ath9k_hw ath usb_wwan sierra rt2x00usb rt2x00lib rndis_host qmi_wwan pppox ppp_mppe ppp_generic nf_nat_pptp nf_conntrack_pptp nf_conntrack_ipv6 mac80211 iptable_nat ipt_REJECT ipt_MASQUERADE huawei_cdc_ncm cp210x cfg80211 cdc_ncm cdc_ether xt_u32 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_hl xt_helper xt_hashlimit xt_ecn xt_dscp xt_conntrack xt_connmark xt_connlimit xt_connbytes xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_IPMARK xt_HL xt_FLOWOFFLOAD xt_DSCP xt_CT xt_CLASSIFY wireguard usbserial usbnet ts_fsm ts_bm slhc nf_reject_ipv4 nf_nat_tftp nf_nat_snmp_basic nf_nat_sip nf_nat_redirect nf_nat_proto_gre nf_nat_masquerade_ipv4 nf_nat_irc
[113407.649953]  nf_conntrack_ipv4 nf_nat_ipv4 nf_nat_h323 nf_nat_amanda nf_nat nf_log_ipv4 nf_flow_table_hw nf_flow_table nf_defrag_ipv6 nf_defrag_ipv4 nf_conntrack_tftp nf_conntrack_snmp nf_conntrack_sip nf_conntrack_rtcache nf_conntrack_proto_gre nf_conntrack_irc nf_conntrack_h323 nf_conntrack_broadcast ts_kmp nf_conntrack_amanda iptable_raw iptable_mangle iptable_filter ipt_ECN ipheth ip_tables crc_ccitt compat_xtables compat cdc_wdm cdc_acm fuse sch_teql sch_sfq sch_red sch_prio sch_pie sch_multiq sch_gred sch_fq sch_dsmark sch_codel sch_cbq em_text em_nbyte em_meta em_cmp act_simple act_police act_pedit act_ipt act_gact act_csum libcrc32c act_connmark nf_conntrack sch_tbf sch_ingress sch_htb sch_hfsc em_u32 cls_u32 cls_tcindex cls_route cls_matchall cls_fw cls_flow cls_basic act_skbedit act_mirred
[113407.723272]  ledtrig_usbport xt_set ip_set_list_set ip_set_hash_netportnet ip_set_hash_netport ip_set_hash_netnet ip_set_hash_netiface ip_set_hash_net ip_set_hash_mac ip_set_hash_ipportnet ip_set_hash_ipportip ip_set_hash_ipport ip_set_hash_ipmark ip_set_hash_ip ip_set_bitmap_port ip_set_bitmap_ipmac ip_set_bitmap_ip ip_set nfnetlink nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 ip6_udp_tunnel udp_tunnel tun vfat fat ntfs nls_utf8 nls_iso8859_1 nls_cp437 sha1_generic ecb uas usb_storage uhci_hcd ohci_platform ohci_hcd ehci_platform sd_mod scsi_mod ehci_hcd gpio_button_hotplug ext4 mbcache jbd2 exfat usbcore nls_base usb_common crc16 mii aead crypto_null cryptomgr crc32c_generic crypto_hash
[113407.791831] Process sh (pid: 9896, threadinfo=86b12000, task=87de72a0, tls=78005efc)
[113407.799906] Stack : fffffff8 8013feb4 000007fc 00000000 86f14980 86ae4a00 86f14d9a 868aa420
[113407.808632]         80520000 80145a80 868aa420 8013feb4 00000000 00000154 86f14980 86f14980
[113407.817359]         86ae4a00 8018dc4c 86b13e8c 7fffff4d 00000000 00000000 868d4c40 87de72a0
[113407.826087]         00000001 8011ab40 00000002 868d4c40 00000000 00000001 00002017 86b13e8c
[113407.834813]         00000000 00000000 868d4c78 00002817 00000000 86f14d80 00000005 868aa400
[113407.843541]         ...
[113407.846159] Call Trace:
[113407.848776] [<8014fe20>] getname_kernel+0x3c/0xf4
[113407.853729] [<80145a80>] open_exec+0x14/0x60
[113407.858225] [<8018dc4c>] load_elf_binary+0x1fc/0x13c0
[113407.863529] [<80145f7c>] search_binary_handler.part.47+0x70/0x21c
[113407.869909] [<8014763c>] do_execveat_common+0x498/0x638
[113407.875392] [<80147a00>] SyS_execve+0x34/0x48
[113407.879988] [<8006fd0c>] syscall_common+0x34/0x58
[113407.884936] Code: 264500c0  0c04daef  24510001 <10400023> 00408025  2e220ff1  10400004  2a221001  26040010 
[113407.895106] 
[113407.898547] ---[ end trace d07ea14259cf0fbe ]---
[113407.905934] Kernel panic - not syncing: Fatal exception
[113407.912561] Rebooting in 3 seconds..

Has anyone encountered this problem ?

use taget ath79