Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.19 kernel[0]. If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19-rc6 ** Package changed: linux-hwe (Ubuntu) => linux (Ubuntu) ** Changed in: linux (Ubuntu) Importance: Undecided => High ** Changed in: linux (Ubuntu) Status: New => Triaged ** Tags added: kernel-da-key ** Changed in: linux (Ubuntu) Status: Triaged => Incomplete -- 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/1795659 Title: kernel panic using CIFS share smb2_push_mandatory_locks Status in linux package in Ubuntu: Incomplete Bug description: Description: Ubuntu 16.04.5 LTS Release: 16.04 Kernel: 4.15.0-36-generic #39~16.04.1-Ubuntu SMP Tue Sep 25 08:59:23 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Under load, getting a system crash when accessing files on an SMB3 share. dmesg from crash attached. I can upload the crash dump if needed. Share is mounted with the following options: "ro,_netdev,username=*****,password=*****,domain=*****,vers=3.02,sec=ntlmsspi,nounix,noserverino,nobrl,cache=none" Dmesg points to the cifs module [ 2192.662345] BUG: unable to handle kernel NULL pointer dereference at 0000000000000038 [ 2192.662407] IP: smb2_push_mandatory_locks+0x10e/0x3b0 [cifs] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795659/+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
