@Vald: This is from your attachment: [21965.367843] kernel BUG at /build/linux-azure-njdnVX/linux-azure-4.15.0/net/ipv4/ip_output.c:636! [21965.377590] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.15.0-1056-azure #61-Ubuntu [21965.435777] RIP: 0010:ip_do_fragment+0x571/0x860 [21965.435777] ip_fragment.constprop.47+0x43/0x90 [21965.435777] ip_finish_output+0xf6/0x270 [21965.435777] ip_output+0x75/0xf0 [21965.435777] ip_forward_finish+0x51/0x80 [21965.435777] ip_forward+0x38a/0x480 [21965.435777] ip_rcv_finish+0x122/0x410 [21965.435777] ip_rcv+0x292/0x360 [21965.435777] __netif_receive_skb_core+0x809/0xbc0 [21965.435777] __netif_receive_skb+0x18/0x60 [21965.435777] netif_receive_skb_internal+0x37/0xe0 [21965.435777] napi_gro_receive+0xd0/0xf0 [21965.435777] netvsc_recv_callback+0x16d/0x220 [hv_netvsc] [21965.435777] rndis_filter_receive+0x23b/0x580 [hv_netvsc] [21965.435777] netvsc_poll+0x17e/0x630 [hv_netvsc] [21965.435777] net_rx_action+0x265/0x3b0 [21965.435777] __do_softirq+0xf5/0x2a8 [21965.435777] irq_exit+0x106/0x110 [21965.435777] hyperv_vector_handler+0x63/0x76
So you're running a 4.15.0-1056-azure kernel, which panics at RIP: 0010:ip_do_fragment+0x571/0x860 (net/ipv4/ip_output.c:636). This is a known issue in this version of the kernel and we're working on a new version which will fix the issue: The identified upsream fix is: commit 5d407b071dc369c26a38398326ee2be53651cfe4 Author: Taehee Yoo <ap420...@gmail.com> Date: Mon Sep 10 02:47:05 2018 +0900 Subject: ip: frags: fix crash in ip_do_fragment() ( https://github.com/torvalds/linux/commit/5d407b071dc369c26a38398326ee2be53651cfe4 ) Meanwhile, if it's possible, please downgrade the kernel to from -1056 to -1052, which per support does not crash. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-azure in Ubuntu. https://bugs.launchpad.net/bugs/1822133 Title: Azure Instance never recovered during series of instance reboots. Status in linux-azure package in Ubuntu: Incomplete Bug description: Description: During SRU Testing of various Azure Instances, there will be some cases where the instance will not respond following a system reboot. SRU Testing only restarts a giving instance once, after it preps all of the necessary files to-be-tested. Series: Disco Instance Size: Basic_A3 Region: (Default) US-WEST-2 Kernel Version: 4.18.0-1013-azure #13-Ubuntu SMP Thu Feb 28 22:54:16 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux I initiated a series of tests which rebooted Azure Cloud instances 50 times. During the 49th Reboot, an Instance failed to return from a reboot.. Upon grabbing the console output the following was seen scrolling endlessly. I have seen this failure in cases where the instance only restarted a handful of times >5 [ 84.247704]hyperv_fb: unable to send packet via vmbus [ 84.247704]hyperv_fb: unable to send packet via vmbus [ 84.247704]hyperv_fb: unable to send packet via vmbus [ 84.247704]hyperv_fb: unable to send packet via vmbus [ 84.247704]hyperv_fb: unable to send packet via vmbus [ 84.247704]hyperv_fb: unable to send packet via vmbus [ 84.247704]hyperv_fb: unable to send packet via vmbus [ 84.247704]hyperv_fb: unable to send packet via vmbus In another test attempt I saw the following failure: ERROR ExtHandler /proc/net/route contains no routes ERROR ExtHandler /proc/net/route contains no routes ERROR ExtHandler /proc/net/route contains no routes ERROR ExtHandler /proc/net/route contains no routes ERROR ExtHandler /proc/net/route contains no routes ERROR ExtHandler /proc/net/route contains no routes ERROR ExtHandler /proc/net/route contains no routes Both of these failures broke networking, Both of these failures were seen at least twice to three times, thus may explain why in some cases we never recover from an instance reboot. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1822133/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
