Hi Kleber, I tested the Xenial kernel from -proposed and got the following crash:
Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262084] BUG: unable to handle kernel NULL pointer dereference at (null) Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262087] IP: [<ffffffffc034151c>] cifs_discard_remaining_data+0xc/0x70 [cifs] Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262098] PGD 7db4fb067 PUD 7d5e3a067 PMD 0 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262100] Oops: 0000 [#1] SMP Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262340] Modules linked in: cifs drbg ansi_cprng cmac arc4 md4 nls_utf8 ccm fscache crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel i2c_piix4 aes_x86_64 8250_fintek lrw hyperv_fb gf128mul hv_balloon glue_helper ablk_helper cryptd input_leds serio_raw joydev mac_hid nfsd auth_rpcgss nfs_acl lockd grace sunrpc parport_pc ppdev lp parport autofs4 hid_generic hv_netvsc hv_utils ptp hid_hyperv hv_storvsc pps_core hid scsi_transport_fc hyperv_keyboard psmouse pata_acpi hv_vmbus floppy fjes [last unloaded: cifs] Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262360] CPU: 2 PID: 18568 Comm: cifsd Not tainted 4.4.0-85-generic #108-Ubuntu Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262361] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090006 01/06/2017 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262362] task: ffff8807e1440f00 ti: ffff8807da868000 task.ti: ffff8807da868000 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262363] RIP: 0010:[<ffffffffc034151c>] [<ffffffffc034151c>] cifs_discard_remaining_data+0xc/0x70 [cifs] Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262371] RSP: 0018:ffff8807da86bdc0 EFLAGS: 00010246 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262372] RAX: 00000000ffffffc3 RBX: ffff8807df0ae200 RCX: 0000000000000000 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262373] RDX: ffffffffc0390b80 RSI: 0000000000000000 RDI: ffff8807db71c000 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262373] RBP: ffff8807da86bdd0 R08: 000000000000004d R09: ffff8807da86bcfc Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262374] R10: 00000000000001fc R11: 0000000000000000 R12: 000000000000004d Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262375] R13: ffff8800f2fa1c00 R14: ffff8800f2fa1c00 R15: ffff8807df2ea680 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262376] FS: 0000000000000000(0000) GS:ffff8807e5680000(0000) knlGS:0000000000000000 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262377] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262377] CR2: 0000000000000000 CR3: 00000007de707000 CR4: 00000000003406e0 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262379] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262380] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262380] Stack: Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262381] ffff8807df0ae200 000000000000004d ffff8807da86bdf8 ffffffffc034159e Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262382] ffff8807db71c000 000000000000004d ffff8807df0ae200 ffff8807da86be40 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262383] ffffffffc0341694 0000000000000000 0000000000000000 ffff8807e1440f00 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262385] Call Trace: Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262391] [<ffffffffc034159e>] cifs_readv_discard+0x1e/0x40 [cifs] Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262396] [<ffffffffc0341694>] cifs_readv_receive+0xd4/0x590 [cifs] Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262402] [<ffffffffc034f4f8>] cifs_demultiplex_thread+0x778/0xac0 [cifs] Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262408] [<ffffffffc034ed80>] ? cifs_handle_standard+0x130/0x130 [cifs] Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262410] [<ffffffff810a0c85>] kthread+0xe5/0x100 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262412] [<ffffffff810a0ba0>] ? kthread_create_on_node+0x1e0/0x1e0 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262414] [<ffffffff8184224f>] ret_from_fork+0x3f/0x70 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262415] [<ffffffff810a0ba0>] ? kthread_create_on_node+0x1e0/0x1e0 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262416] Code: 84 69 fe ff ff 44 89 f0 eb 92 41 81 4d 00 00 00 02 00 e9 31 ff ff ff e8 03 fc d3 c0 0f 1f 00 0f 1f 44 00 00 55 48 89 e5 41 54 53 <8b> 06 bb 04 00 00 00 2b 9f 60 03 00 00 49 89 fc 0f c8 25 ff ff Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262429] RIP [<ffffffffc034151c>] cifs_discard_remaining_data+0xc/0x70 [cifs] Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262435] RSP <ffff8807da86bdc0> Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262435] CR2: 0000000000000000 Jul 13 14:38:05 ubuntu-vm kernel: [ 770.262437] ---[ end trace 5ac5926a1424b7e6 ]--- I think this issue is caused by commit http://kernel.ubuntu.com/git/ubuntu/ubuntu-xenial.git/commit/?h=master- next&id=bdf2bdef7c7b61663266d942fabd528a4c7eddda which is a copy of upstream commit. In upstream the issue has been fixed by commit https://github.com/torvalds/linux/commit/350be257ea83029daee974c72b1fe2e6f1f8e615. I did cherry-picked it into your Xenial branch and run small tests - it went well. Can you please apply the latter commit as well to the proposed kernel? Also, you might want to consider merging one more commit for encryption series to your branches (small bugfix) - https://github.com/torvalds/linux/commit/517a6e43c4872c89794af5b377fa085e47345952. -- 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/1670508 Title: CIFS: Enable encryption for SMB3 Status in linux package in Ubuntu: Fix Released Status in linux source package in Xenial: Fix Committed Status in linux source package in Yakkety: Fix Released Status in linux source package in Zesty: Fix Released Bug description: There has been work upstream to enable encryption support for SMB3 connections. This is a particularly valuable (and commonly requested) feature with the Azure Files service as encryption is required to connect to an Azure Files storage share from on-prem or from a different Azure region. The relevant commits are as follows: CIFS: Fix possible use after free in demultiplex thread Commit 61cfac6f267dabcf2740a7ec8a0295833b28b5f5 CIFS: Allow to switch on encryption with seal mount option Commit ae6f8dd4d0c87bfb72da9d9b56342adf53e69c31 CIFS: Add capability to decrypt big read responses Commit c42a6abe3012832a68a371dabe17c2ced97e62ad CIFS: Decrypt and process small encrypted packets Commit 4326ed2f6a16ae9d33e4209b540dc9a371aba840 CIFS: Add copy into pages callback for a read operation Commit d70b9104b1ca586f73aaf59426756cec3325a40e CIFS: Add mid handle callback Commit 9b7c18a2d4b798963ea80f6769701dcc4c24b55e CIFS: Add transform header handling callbacks Commit 9bb17e0916a03ab901fb684e874d77a1e96b3d1e CIFS: Encrypt SMB3 requests before sending Commit 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 CIFS: Enable encryption during session setup phase Commit cabfb3680f78981d26c078a26e5c748531257ebb CIFS: Add capability to transform requests before sending Commit 7fb8986e7449d0a5cebd84d059927afa423fbf85 CIFS: Separate RFC1001 length processing for SMB2 read Commit b8f57ee8aad414a3122bff72d7968a94baacb9b6 CIFS: Separate SMB2 sync header processing Commit cb200bd6264a80c04e09e8635fa4f3901cabdaef CIFS: Send RFC1001 length in a separate iov Commit 738f9de5cdb9175c19d24cfdf90b4543fc3b47bf CIFS: Make send_cancel take rqst as argument Commit fb2036d817584df42504910fe104f68517e8990e CIFS: Make SendReceive2() takes resp iov Commit da502f7df03d2d0b416775f92ae022f3f82bedd5 CIFS: Separate SMB2 header structure Commit 31473fc4f9653b73750d3792ffce6a6e1bdf0da7 cifs: Add soft dependencies Commit b9be76d585d48cb25af8db0d35e1ef9030fbe13a cifs: Only select the required crypto modules Commit 3692304bba6164be3810afd41b84ecb0e1e41db1 cifs: Simplify SMB2 and SMB311 dependencies Commit c1ecea87471bbb614f8121e00e5787f363140365 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1670508/+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
