Public bug reported:
"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 000000000000000..."
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Thadeu Lima de Souza Cascardo (cascardo)
Status: In Progress
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https://bugs.launchpad.net/bugs/1704857
Title:
CIFS causes oops
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