BertLammers:

Running OpenWrt SNAPSHOT, r7297-f9a42ae on a Xiaomi Mir3g router.

A kernel crash occurred during a speedtest on www.dslreports.com. No eth0 connectivity seems to be possible after this crash. Wifi connectivity is not impacted. Running '/etc/init.d/network restart' does not restore internet connectivity. After a reboot everything is normal again.

This crash can be easily reproduced by running a speedtest again.

I suspect that this issue is introduced by commit: lede-project/source@9a4253b

Kernel log of the crash:

[ 192.072375] ------------[ cut here ]------------
[ 192.077059] WARNING: CPU: 3 PID: 0 at net/sched/sch_generic.c:320 dev_watchdog+0x1ac/0x324
[ 192.085409] NETDEV WATCHDOG: eth0 (mtk_soc_eth): transmit queue 0 timed out
[ 192.092401] Modules linked in: pppoe ppp_async pppox ppp_generic nf_conntrack_ipv6 mt76x2e mt7603e mt76 mac80211 iptable_nat ipt_REJECT ipt_MASQUERADE cfg80211 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_ecn xt_dscp xt_conntrack xt_connmark xt_connlimit xt_connbytes xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_HL xt_FLOWOFFLOAD xt_DSCP xt_CLASSIFY slhc nf_reject_ipv4 nf_nat_redirect nf_nat_masquerade_ipv4 nf_conntrack_ipv4 nf_nat_ipv4 nf_nat nf_log_ipv4 nf_flow_table_hw nf_flow_table nf_defrag_ipv6 nf_defrag_ipv4 nf_conntrack_rtcache iptable_mangle iptable_filter ipt_ECN ip_tables crc_ccitt compat fuse sch_cake nf_conntrack act_skbedit act_mirred em_u32 cls_u32 cls_tcindex cls_flow cls_route cls_fw sch_tbf sch_htb
[ 192.163227] sch_hfsc sch_ingress ledtrig_usbport ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables x_tables ifb usb_storage leds_gpio xhci_mtk xhci_plat_hcd xhci_pci xhci_hcd sd_mod scsi_mod gpio_button_hotplug usbcore nls_base usb_common
[ 192.188593] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 4.14.50 #0
[ 192.194612] Stack : 00000000 00000000 00000000 00000000 805d7ad2 00000034 00000000 00000000
[ 192.203028] 8fc44e74 805688c7 804f66ac 00000003 00000000 00000001 8fc15d68 1cc282d2
[ 192.211432] 00000000 00000000 805d0000 000066a8 00000000 0000014b 00000008 00000000
[ 192.219811] 00000000 80570000 0002e0b1 00000000 00000000 00000000 80590000 8035e888
[ 192.228184] 00000009 00000140 00000003 8fe71a40 00000003 80288998 0000000c 805d000c
[ 192.236562] ...
[ 192.239067] Call Trace:
[ 192.241604] [<80010558>] show_stack+0x58/0x100
[ 192.246138] [<8043be4c>] dump_stack+0x9c/0xe0
[ 192.250560] [<8002e218>] __warn+0xe0/0x114
[ 192.254741] [<8002e27c>] warn_slowpath_fmt+0x30/0x3c
[ 192.259772] [<8035e888>] dev_watchdog+0x1ac/0x324
[ 192.264537] [<80086014>] call_timer_fn.isra.3+0x24/0x84
[ 192.269753] [<8008622c>] run_timer_softirq+0x1b8/0x244
[ 192.274957] [<80459028>] __do_softirq+0x128/0x2ec
[ 192.279734] [<80032920>] irq_exit+0x98/0xcc
[ 192.283994] [<8023d16c>] plat_irq_dispatch+0xfc/0x138
[ 192.289103] [<8000b5a8>] except_vec_vi_end+0xb8/0xc4
[ 192.294122] [<8000cf70>] r4k_wait_irqoff+0x1c/0x24
[ 192.299010] [<800662cc>] do_idle+0xe4/0x168
[ 192.303278] [<80066548>] cpu_startup_entry+0x24/0x2c
[ 192.308376] ---[ end trace ba676a4fa342a1a1 ]---
[ 192.313013] mtk_soc_eth 1e100000.ethernet eth0: transmit timed out
[ 192.319179] mtk_soc_eth 1e100000.ethernet eth0: dma_cfg:80000067
[ 192.325200] mtk_soc_eth 1e100000.ethernet eth0: tx_ring=0, base=0eb40000, max=0, ctx=523, dtx=510, fdx=501, next=523
[ 192.335692] mtk_soc_eth 1e100000.ethernet eth0: rx_ring=0, base=0e2d0000, max=0, calc=1782, drx=1783
[ 192.745873] mtk_soc_eth 1e100000.ethernet: 0x100 = 0x5f60000c, 0x10c = 0x80818
[ 192.760124] mtk_soc_eth 1e100000.ethernet: PPE started