RPI 3B+. My configuration is as follows: Raspian (buster) 5.4.51-v7+#1333 SMP Mon Aug 10 16:45:19 BST 2020
wlan0 AP, no bridge, fixed IP. wlan1 USB Wifi adapter ppp0 Hologram Nova Modem My application is in the field, so Wifi HotSpots can be unreliable (I can get an IP but can't connect). So I watch to see if I can get to the internet through wlan1 and if I cannot, I switch to cellular. Once on cellular, I look to see if I can get to the Internet via wlan1 (cheaper / faster) by ifconfig wlan1 up. When I do connect, I am sending a lot of data. Hard to pin what actions are triggering the NETDEV WATCHDOG backtrace, but it leaves wlan1 in a state where it cannot come up again: SIOCSIFFLAGS: No such device ip address shows wlan1: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN group default qlen 1000 vcgencmd shows: Aug 6 2020 16:24:09 version af3...d5b337 (clean) (release) (start) Not clear this is the same issue, but I thought I'd report as a use case. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-raspi2 in Ubuntu. https://bugs.launchpad.net/bugs/1861936 Title: Raspberry Pi 3 network dies shortly after a burst of IPv6 tunnel network load ((lan78xx): transmit queue 0 timed out) Status in linux-raspi2 package in Ubuntu: Incomplete Status in linux-raspi2 source package in Eoan: Won't Fix Status in linux-raspi2 source package in Focal: Confirmed Bug description: Desciption changed: Raspberry Pi 3 network partially dies (transmission doesn't work, reception still does) shortly after a burst of network load over IPv6, when IPv6 connectivity is provided by a tunnel from tunnelbroker.net. The triggering load is typically an HTTP(S) download, and replication can be done without actually saving the file (wget -O /dev/null ...). Problem happens within downloading ~10 GB, usually withinthe first 1 GB of traffic) Replication is 100% as long as _all_ of the following conditions are met - 6in4 tunnel to HE.net set up with netplan - ipv6 rules applied (netfilter-persistent) - ipv6 forwarding enabled (edit /etc/sysctl.conf) kern.log message that appears after a while: Feb 4 23:42:59 rpi3 kernel: [ 571.878359] ------------[ cut here ]------------ Feb 4 23:42:59 rpi3 kernel: [ 571.878420] NETDEV WATCHDOG: eth0 (lan78xx): transmit queue 0 timed out Feb 4 23:42:59 rpi3 kernel: [ 571.878550] WARNING: CPU: 3 PID: 0 at net/sched/sch_generic.c:447 dev_watchdog+0x324/0x330 Feb 4 23:42:59 rpi3 kernel: [ 571.878557] Modules linked in: sit tunnel4 ip_tunnel bridge stp llc ip6table_filter ip6_tables xt_tcpudp xt_conntrack nf_conntrack iptable_filter bpfilter nls_ascii dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua btsdio bluetooth ecdh_generic ecc brcmfmac brcmutil cfg80211 bcm2835_v4l2(CE) bcm2835_mmal_vchiq(CE) input_leds vc_sm_cma(CE) v4l2_common videobuf2_vmalloc spidev videobuf2_memops videobuf2_v4l2 raspberrypi_hwmon videobuf2_common videodev mc uio_pdrv_genirq uio sch_fq_codel jool(OE) jool_common(OE) nf_defrag_ipv6 nf_defrag_ipv4 ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor xor_neon raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic usbhid crct10dif_ce sdhci_iproc phy_generic fixed aes_neon_bs aes_neon_blk crypto_simd cryptd aes_arm64 Feb 4 23:42:59 rpi3 kernel: [ 571.878774] CPU: 3 PID: 0 Comm: swapper/3 Tainted: G C OE 5.3.0-1017-raspi2 #19-Ubuntu Feb 4 23:42:59 rpi3 kernel: [ 571.878781] Hardware name: Raspberry Pi 3 Model B Plus Rev 1.3 (DT) Feb 4 23:42:59 rpi3 kernel: [ 571.878789] pstate: 60400005 (nZCv daif +PAN -UAO) Feb 4 23:42:59 rpi3 kernel: [ 571.878800] pc : dev_watchdog+0x324/0x330 Feb 4 23:42:59 rpi3 kernel: [ 571.878807] lr : dev_watchdog+0x324/0x330 Feb 4 23:42:59 rpi3 kernel: [ 571.878812] sp : ffff00001001bd60 Feb 4 23:42:59 rpi3 kernel: [ 571.878817] x29: ffff00001001bd60 x28: 0000000000000140 Feb 4 23:42:59 rpi3 kernel: [ 571.878827] x27: 00000000ffffffff x26: 0000000000000000 Feb 4 23:42:59 rpi3 kernel: [ 571.878836] x25: ffff8ecbefa4e000 x24: ffff305e0f529018 Feb 4 23:42:59 rpi3 kernel: [ 571.878845] x23: 0000000000000000 x22: 0000000000000001 Feb 4 23:42:59 rpi3 kernel: [ 571.878853] x21: ffff8ecbefa4e480 x20: ffff305e0f807000 Feb 4 23:42:59 rpi3 kernel: [ 571.878862] x19: 0000000000000000 x18: 0000000000000000 Feb 4 23:42:59 rpi3 kernel: [ 571.878871] x17: ffff000010fd8218 x16: ffff305e0e30efb8 Feb 4 23:42:59 rpi3 kernel: [ 571.878879] x15: ffff8ecbf922a290 x14: ffffffffffffffff Feb 4 23:42:59 rpi3 kernel: [ 571.878888] x13: 0000000000000000 x12: ffff305e0f944000 Feb 4 23:42:59 rpi3 kernel: [ 571.878897] x11: ffff305e0f82d000 x10: 0000000000000000 Feb 4 23:42:59 rpi3 kernel: [ 571.878905] x9 : 0000000000000004 x8 : 000000000000017f Feb 4 23:42:59 rpi3 kernel: [ 571.878913] x7 : 0000000000000000 x6 : 0000000000000001 Feb 4 23:42:59 rpi3 kernel: [ 571.878921] x5 : 0000000000000000 x4 : 0000000000000008 Feb 4 23:42:59 rpi3 kernel: [ 571.878929] x3 : ffff305e0ee15750 x2 : 0000000000000004 Feb 4 23:42:59 rpi3 kernel: [ 571.878937] x1 : 6abb42c67c954600 x0 : 0000000000000000 Feb 4 23:42:59 rpi3 kernel: [ 571.878946] Call trace: Feb 4 23:42:59 rpi3 kernel: [ 571.878955] dev_watchdog+0x324/0x330 Feb 4 23:42:59 rpi3 kernel: [ 571.878967] call_timer_fn+0x3c/0x178 Feb 4 23:42:59 rpi3 kernel: [ 571.878977] __run_timers.part.0+0x200/0x330 Feb 4 23:42:59 rpi3 kernel: [ 571.878985] run_timer_softirq+0x40/0x78 Feb 4 23:42:59 rpi3 kernel: [ 571.878995] __do_softirq+0x168/0x384 Feb 4 23:42:59 rpi3 kernel: [ 571.879007] irq_exit+0xb0/0xe8 Feb 4 23:42:59 rpi3 kernel: [ 571.879020] __handle_domain_irq+0x70/0xc0 Feb 4 23:42:59 rpi3 kernel: [ 571.879028] bcm2836_arm_irqchip_handle_irq+0x74/0xe0 Feb 4 23:42:59 rpi3 kernel: [ 571.879037] el1_irq+0x108/0x200 Feb 4 23:42:59 rpi3 kernel: [ 571.879050] arch_cpu_idle+0x3c/0x1c8 Feb 4 23:42:59 rpi3 kernel: [ 571.879069] default_idle_call+0x24/0x48 Feb 4 23:42:59 rpi3 kernel: [ 571.879081] do_idle+0x210/0x2a0 Feb 4 23:42:59 rpi3 kernel: [ 571.879091] cpu_startup_entry+0x28/0x30 Feb 4 23:42:59 rpi3 kernel: [ 571.879102] secondary_start_kernel+0x154/0x1c8 Feb 4 23:42:59 rpi3 kernel: [ 571.879108] ---[ end trace 349744d60a20e77a ]--- ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: linux-image-5.3.0-1017-raspi2 5.3.0-1017.19 ProcVersionSignature: Ubuntu 5.3.0-1017.19-raspi2 5.3.13 Uname: Linux 5.3.0-1017-raspi2 aarch64 ApportVersion: 2.20.11-0ubuntu8.2 Architecture: arm64 Date: Tue Feb 4 23:49:19 2020 ProcEnviron: TERM=linux PATH=(custom, no user) LANG=C.UTF-8 SHELL=/bin/bash SourcePackage: linux-raspi2 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1861936/+subscriptions -- 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