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Description:    Ubuntu 16.04 LTS
Linux alpdq5p03 4.4.0-22-generic #40-Ubuntu SMP Thu May 12 22:03:35 UTC 2016 
ppc64le ppc64le ppc64le GNU/Linux

Problem Description :

When I created a vNIC on alpdq5p03 using U78C7.001.KIC1906-P1-C12-T1 via
alpdq5p08 and U78C7.001.KIC1906-P1-C12-T2 via alpdq5p09 as the backing
devices I got a kernel panic.

[  129.977324] ibmvnic 30000004: Virtual Adapter failed (rc=8)
[  129.977346] Unable to handle kernel paging request for data at address 
0x000000f1
[  129.977351] Faulting instruction address: 0xd000000010882434
[  129.977355] Oops: Kernel access of bad area, sig: 11 [#1]
[  129.977359] SMP NR_CPUS=2048 NUMA pSeries
[  129.977364] Modules linked in: ibmvnic rpadlpar_io rpaphp nfsv3 nfs_acl 
rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache dccp_diag dccp 
tcp_diag udp_diag inet_diag unix_diag af_packet_diag netlink_diag rtc_generic 
pseries_rng binfmt_misc sunrpc autofs4 ibmvscsi ibmveth
[  129.977392] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.0-22-generic 
#40-Ubuntu
[  129.977397] task: c0000000015566b0 ti: c000001ffffd8000 task.ti: 
c0000000015b0000
[  129.977401] NIP: d000000010882434 LR: d000000010882420 CTR: c0000000002b25f0
[  129.977406] REGS: c000001ffffdb9c0 TRAP: 0300   Not tainted  
(4.4.0-22-generic)
[  129.977410] MSR: 8000000000009033 <SF,EE,ME,IR,DR,RI,LE>  CR: 48048224  XER: 
20000010
[  129.977422] CFAR: c000000000008468 DAR: 00000000000000f1 DSISR: 40000000 
SOFTE: 0 
GPR00: d000000010882420 c000001ffffdbc40 d000000010894240 0000000000000000 
GPR04: c000001ff4039ee0 0000000000000000 0000001ffdd80000 0000000000002082 
GPR08: c000000000f9fda8 c000000000f9fda8 0000001ffdd80000 d0000000108896e8 
GPR12: c0000000002b25f0 c00000000e7e0000 c0000000015eef18 c000000000f9d678 
GPR16: 0000000000000001 0000000000000000 c000001fd3960e18 c000001fd3960db0 
GPR20: c0000000015b0000 c000001fd3960d98 c000001fd3960e08 c000001fd3960900 
GPR24: c000001fd3960d88 c000001fd39bf000 c000001fd39bf048 0000000000000000 
GPR28: 0000000000000100 0000000000000200 00000000000000f0 c000001fd3960900 
[  129.977482] NIP [d000000010882434] ibmvnic_free_inflight+0x104/0x330 
[ibmvnic]
[  129.977488] LR [d000000010882420] ibmvnic_free_inflight+0xf0/0x330 [ibmvnic]
[  129.977492] Call Trace:
[  129.977496] [c000001ffffdbc40] [d000000010882420] 
ibmvnic_free_inflight+0xf0/0x330 [ibmvnic] (unreliable)
[  129.977503] [c000001ffffdbce0] [d000000010887188] 
ibmvnic_handle_crq+0x3a8/0x2010 [ibmvnic]
[  129.977509] [c000001ffffdbda0] [d000000010888ea8] 
ibmvnic_interrupt+0xb8/0x198 [ibmvnic]
[  129.977517] [c000001ffffdbe10] [c000000000130660] 
handle_irq_event_percpu+0xa0/0x320
[  129.977523] [c000001ffffdbed0] [c000000000130948] handle_irq_event+0x68/0xc0
[  129.977528] [c000001ffffdbf00] [c000000000135c2c] 
handle_fasteoi_irq+0xec/0x2b0
[  129.977534] [c000001ffffdbf30] [c00000000012f844] 
generic_handle_irq+0x54/0x80
[  129.977539] [c000001ffffdbf60] [c000000000011320] __do_irq+0x80/0x1d0
[  129.977545] [c000001ffffdbf90] [c000000000024800] call_do_irq+0x14/0x24
[  129.977550] [c0000000015b39a0] [c000000000011508] do_IRQ+0x98/0x140
[  129.977555] [c0000000015b39f0] [c000000000002594] 
hardware_interrupt_common+0x114/0x180
[  129.977563] --- interrupt: 501 at plpar_hcall_norets+0x1c/0x28
[  129.977563]     LR = check_and_cede_processor+0x34/0x50
[  129.977570] [c0000000015b3ce0] [c00000000090d9f0] 
check_and_cede_processor+0x20/0x50 (unreliable)
[  129.977576] [c0000000015b3d40] [c00000000090da94] 
dedicated_cede_loop+0x74/0x190
[  129.977582] [c0000000015b3d80] [c00000000090ac20] 
cpuidle_enter_state+0x160/0x410
[  129.977588] [c0000000015b3de0] [c000000000119a88] call_cpuidle+0x78/0xd0
[  129.977593] [c0000000015b3e20] [c000000000119e5c] 
cpu_startup_entry+0x37c/0x480
[  129.977599] [c0000000015b3ee0] [c00000000000bdcc] rest_init+0xac/0xc0
[  129.977605] [c0000000015b3f00] [c000000000ea3f5c] start_kernel+0x53c/0x558
[  129.977610] [c0000000015b3f90] [c000000000008c6c] start_here_common+0x20/0xa8
[  129.977615] Instruction dump:
[  129.977617] e95e0010 7fc3f378 f92a0008 f9490000 fb9e0010 fbbe0018 480072cd 
e8410018 
[  129.977626] ebde0010 7fb6f040 3bdefff0 419e00f4 <893e0001> 2f890009 409effb4 
7ea3ab78 
[  129.977636] ---[ end trace 79d415687d3074f2 ]---
[  129.979495] 
[  131.979529] Kernel panic - not syncing: Fatal exception in interrupt
[  131.985480] ---[ end Kernel panic - not syncing: Fatal exception in interrupt

There was a fix for this particular bug in the ibmvnic_free_inflight
function pushed upstream.

Here is the commit (actually noticed by someone else independently
before I could push my own patch)

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=96183182ad05d1ce31b9048921c12bf4ad621eaf

This patch should fix this kernel panic.

A test kernel needs to be built and tested but mirroring to Launchpad
for a heads up to Canonical.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New


** Tags: architecture-ppc64le bugnameltc-142343 severity-high 
targetmilestone-inin16041
-- 
STC860:alpine-pdq:alpdq5p03: kernel panic when adding vnic
https://bugs.launchpad.net/bugs/1626222
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