Verfied fix by reporter ** Tags removed: amd64 apport-bug apport-collected verification-needed-xenial xenial ** Tags added: verification-done-xenial
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1824687 Title: 4.4.0-145-generic Kernel Panic ip6_expire_frag_queue Status in linux package in Ubuntu: Triaged Status in linux source package in Xenial: Fix Committed Status in linux source package in Cosmic: Incomplete Status in linux source package in Disco: Triaged Bug description: [SRU Justification] == Impact == Since 05c0b86b96 "ipv6: frags: rewrite ip6_expire_frag_queue()" the 16.04/4.4 kernel crashes whenever that functions gets called (on busy systems this can be every 3-4 hours). While this potentially affects Cosmic and later, too, the fix differs on later kernels (Bionic is not yet affected as it does not yet carry updates to the frags handling). == Fix == For Xenial and Cosmic, the proposed fix would be additional changes to ip6_expipre_frag_queue(), taken from follow-up changes to ip_expire(). For Disco, I would hold back because we have a backlog of stable patches there and depending on what got backported to 5.0.y there would be a simpler fix. For current development kernels, one just needs to ensure that the following upstream change is included: 47d3d7fdb10a "ip6: fix skb leak in ip6frag_expire_frag_queue()". == Testcase == Unfortunately this could not be re-created locally. But a test kernel which had the proposed fix applied was showing good testing (see comment #37 and #38). == Risk of Regression == The modified function is only called in rare cases and the positive testing in production would cover this. So I would consider it low. --- Description: Ubuntu 16.04.6 LTS Release: 16.04 After upgrading our server to this Kernel we experience frequent Kernel panics (Attachment). Every 3 hours. Our machine has a throuput of about 600 Mbits/s The Panics are around the area of ip6_expire_frag_queue. __pskb_pull_tail ip6_dst_lookup_tail _decode_session6 __xfrm_decode_session icmpv6_route_lookup icmp6_send It seems similar to Bug Report in Debian. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=922488 According to the bug finder of above bug it also occurred after using a Kernel with the change of rewrite ip6_expire_frag_queue() Intermediate solution. We disabled IPv6 on this machine to avoid further Panics. Please let me know what information is missing. The ubuntu-bug linux was send. And I hope it is attached to this report. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-145-generic 4.4.0-145.171 ProcVersionSignature: Ubuntu 4.4.0-145.171-generic 4.4.176 Uname: Linux 4.4.0-145-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.18 Architecture: amd64 Date: Sun Apr 14 11:40:11 2019 InstallationDate: Installed on 2018-03-18 (391 days ago) InstallationMedia: Ubuntu-Server 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228) ProcEnviron: LANGUAGE=en_GB:en TERM=xterm-256color PATH=(custom, no user) LANG=en_GB.UTF-8 SHELL=/bin/bash SourcePackage: linux-signed UpgradeStatus: Upgraded to xenial on 2018-10-21 (174 days ago) --- AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Apr 12 21:04 seq crw-rw---- 1 root audio 116, 33 Apr 12 21:04 timer AplayDevices: Error: [Errno 2] No such file or directory ApportVersion: 2.20.1-0ubuntu2.18 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: DistroRelease: Ubuntu 16.04 HibernationDevice: RESUME=/dev/mapper/tor3--vg-swap_1 InstallationDate: Installed on 2018-03-18 (393 days ago) InstallationMedia: Ubuntu-Server 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228) IwConfig: Error: [Errno 2] No such file or directory Lsusb: Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 003: ID 0557:2221 ATEN International Co., Ltd Winbond Hermon Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Supermicro X9SRE/X9SRE-3F/X9SRi/X9SRi-3F Package: linux (not installed) PciMultimedia: ProcEnviron: LANGUAGE=en_GB:en TERM=xterm-256color PATH=(custom, no user) LANG=en_GB.UTF-8 SHELL=/bin/bash ProcFB: 0 VESA VGA ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-145-generic root=/dev/mapper/hostname--vg-root ro ProcVersionSignature: Ubuntu 4.4.0-145.171-generic 4.4.176 RelatedPackageVersions: linux-restricted-modules-4.4.0-145-generic N/A linux-backports-modules-4.4.0-145-generic N/A linux-firmware 1.157.21 RfKill: Error: [Errno 2] No such file or directory Tags: xenial xenial Uname: Linux 4.4.0-145-generic x86_64 UpgradeStatus: Upgraded to xenial on 2018-10-21 (176 days ago) UserGroups: _MarkForUpload: True dmi.bios.date: 10/08/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1.0c dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: X9SRE/X9SRE-3F/X9SRi/X9SRi-3F dmi.board.vendor: Supermicro dmi.board.version: 1.2 dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: Supermicro dmi.chassis.version: 0123456789 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.0c:bd10/08/2012:svnSupermicro:pnX9SRE/X9SRE-3F/X9SRi/X9SRi-3F:pvr0123456789:rvnSupermicro:rnX9SRE/X9SRE-3F/X9SRi/X9SRi-3F:rvr1.2:cvnSupermicro:ct3:cvr0123456789: dmi.product.name: X9SRE/X9SRE-3F/X9SRi/X9SRi-3F dmi.product.version: 0123456789 dmi.sys.vendor: Supermicro To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1824687/+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