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[Chris J Arges <1476244@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

[Impact]

Users of openvswitch on ppc64el 4.1+ kernels may run into the following
kernel oops:

[  168.987013] Faulting instruction address: 0xc000000000291d60
[  168.987032] Oops: Kernel access of bad area, sig: 11 [#1]
[  168.987086] SMP NR_CPUS=2048 NUMA PowerNV
[  168.987134] Modules linked in: veth openvswitch libcrc32c ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi btrfs xor raid6_pq powernv_rng uio_pdrv_genirq uio autofs4 ses enclosure ipr
[  168.987473] CPU: 16 PID: 996 Comm: kworker/16:1 Not tainted 4.1.0-1-generic #1~rc2-Ubuntu
[  168.987546] Workqueue: events od_dbs_timer
[  168.987592] task: c000000fe49ea400 ti: c000000fe1380000 task.ti: c000000fe1380000
[  168.987659] NIP: c000000000291d60 LR: c000000000292254 CTR: c000000000292140
[  168.987725] REGS: c000000fe1383170 TRAP: 0300   Not tainted  (4.1.0-1-generic)
[  168.987791] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE>  CR: 28028082  XER: 20000000
[  168.987959] CFAR: c000000000008468 DAR: 00000000ffffffff DSISR: 42000000 SOFTE: 1 
GPR00: c000000000292254 c000000fe13833f0 c0000000014bda00 c000000ff701f800 
GPR04: f0000000003fffc0 00000000ffffffff d0000000120cd694 0000000000002fb2 
GPR08: 0000000000000000 0000000000000000 0000000000210d00 d0000000120d2520 
GPR12: c000000000292140 c00000000fb89000 c0000000000de5f8 000000000000000a 
GPR16: c000000febbe3828 0000000000000001 0000000000000000 c0000000013d0c80 
GPR20: c000000000aa36f8 7fffffffffffffff 0000000000000000 0000000000000001 
GPR24: c0000000013c9200 0000000000210d00 00000000ffffffff c000000ff701f800 
GPR28: 0000000000000001 0000000000000000 0000000000000000 f0000000003fffc0 
[  168.988845] NIP [c000000000291d60] __slab_free+0x90/0x470
[  168.988891] LR [c000000000292254] kmem_cache_free+0x114/0x2d0
[  168.988947] Call Trace:
[  168.988971] [c000000fe13833f0] [c000000fe1383500] 0xc000000fe1383500 (unreliable)
[  168.989049] [c000000fe13834f0] [c000000000292254] kmem_cache_free+0x114/0x2d0
[  168.989118] [c000000fe1383570] [d0000000120cd694] flow_free+0xa4/0x120 [openvswitch]
[  168.989196] [c000000fe13835b0] [c000000000136090] rcu_process_callbacks+0x360/0x730
[  168.989275] [c000000fe1383660] [c0000000000b824c] __do_softirq+0x19c/0x3b0
[  168.989342] [c000000fe1383760] [c0000000000b86d8] irq_exit+0xc8/0x100
[  168.989409] [c000000fe1383780] [c00000000003ed78] doorbell_exception+0xa8/0xe0
[  168.989488] [c000000fe13837b0] [c000000000003314] h_doorbell_common+0x114/0x180
[  168.989567] --- interrupt: e81 at osq_lock+0xb8/0x1f0
[  168.989567]     LR = mutex_optimistic_spin+0xdc/0x280
[  168.989656] [c000000fe1383aa0] [c00000000013e280] add_timer_on+0xc0/0x160 (unreliable)
[  168.989734] [c000000fe1383ad0] [c000000000116f4c] mutex_optimistic_spin+0xdc/0x280
[  168.989813] [c000000fe1383b30] [c000000000a60d04] __mutex_lock_slowpath+0x54/0x1f0
[  168.989891] [c000000fe1383bb0] [c000000000a60f18] mutex_lock+0x78/0xa0
[  168.989959] [c000000fe1383be0] [c0000000008965bc] od_dbs_timer+0x7c/0x1d0
[  168.990026] [c000000fe1383c50] [c0000000000d6434] process_one_work+0x1a4/0x4c0
[  168.990104] [c000000fe1383ce0] [c0000000000d68e4] worker_thread+0x194/0x600
[  168.990171] [c000000fe1383d80] [c0000000000de700] kthread+0x110/0x130
[  168.990239] [c000000fe1383e30] [c0000000000094f4] ret_from_kernel_thread+0x5c/0x68
[  168.990316] Instruction dump:
[  168.990349] 614a0d00 7d484838 2fa80000 409e029c 3f200021 3b800001 63390d00 408200a4 
[  168.990461] e93b0022 82ff0018 ebdf0010 92e10078 <7fda492a> a1210078 3929ffff 79290420 
[  168.990618] ---[ end trace bd509c1e05c7f71f ]---


This seems to not happen in VMs running on ppc64el, and doesn't occur on x86_64. I've also tested latest mainline tree and it also occurs.

[Test Case]

# apt-get install openvswitch-switch
# ip link add type veth peer name testveth0
# ovs-vsctl add-br integbr

** Affects: linux (Ubuntu)
     Importance: Medium
     Assignee: Chris J Arges (arges)
         Status: In Progress


** Tags: bug-exists-upstream ppc64el

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https://bugs.launchpad.net/bugs/1476244

Title:
  openvswitch, ppc64el: oops when calling kmem_cache_free from flow_free

Status in linux package in Ubuntu:
  In Progress

Bug description:
  [Impact]

  Users of openvswitch on ppc64el 4.1+ kernels may run into the
  following kernel oops:

  [  168.987013] Faulting instruction address: 0xc000000000291d60
  [  168.987032] Oops: Kernel access of bad area, sig: 11 [#1]
  [  168.987086] SMP NR_CPUS=2048 NUMA PowerNV
  [  168.987134] Modules linked in: veth openvswitch libcrc32c ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi btrfs xor raid6_pq powernv_rng uio_pdrv_genirq uio autofs4 ses enclosure ipr
  [  168.987473] CPU: 16 PID: 996 Comm: kworker/16:1 Not tainted 4.1.0-1-generic #1~rc2-Ubuntu
  [  168.987546] Workqueue: events od_dbs_timer
  [  168.987592] task: c000000fe49ea400 ti: c000000fe1380000 task.ti: c000000fe1380000
  [  168.987659] NIP: c000000000291d60 LR: c000000000292254 CTR: c000000000292140
  [  168.987725] REGS: c000000fe1383170 TRAP: 0300   Not tainted  (4.1.0-1-generic)
  [  168.987791] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE>  CR: 28028082  XER: 20000000
  [  168.987959] CFAR: c000000000008468 DAR: 00000000ffffffff DSISR: 42000000 SOFTE: 1 
  GPR00: c000000000292254 c000000fe13833f0 c0000000014bda00 c000000ff701f800 
  GPR04: f0000000003fffc0 00000000ffffffff d0000000120cd694 0000000000002fb2 
  GPR08: 0000000000000000 0000000000000000 0000000000210d00 d0000000120d2520 
  GPR12: c000000000292140 c00000000fb89000 c0000000000de5f8 000000000000000a 
  GPR16: c000000febbe3828 0000000000000001 0000000000000000 c0000000013d0c80 
  GPR20: c000000000aa36f8 7fffffffffffffff 0000000000000000 0000000000000001 
  GPR24: c0000000013c9200 0000000000210d00 00000000ffffffff c000000ff701f800 
  GPR28: 0000000000000001 0000000000000000 0000000000000000 f0000000003fffc0 
  [  168.988845] NIP [c000000000291d60] __slab_free+0x90/0x470
  [  168.988891] LR [c000000000292254] kmem_cache_free+0x114/0x2d0
  [  168.988947] Call Trace:
  [  168.988971] [c000000fe13833f0] [c000000fe1383500] 0xc000000fe1383500 (unreliable)
  [  168.989049] [c000000fe13834f0] [c000000000292254] kmem_cache_free+0x114/0x2d0
  [  168.989118] [c000000fe1383570] [d0000000120cd694] flow_free+0xa4/0x120 [openvswitch]
  [  168.989196] [c000000fe13835b0] [c000000000136090] rcu_process_callbacks+0x360/0x730
  [  168.989275] [c000000fe1383660] [c0000000000b824c] __do_softirq+0x19c/0x3b0
  [  168.989342] [c000000fe1383760] [c0000000000b86d8] irq_exit+0xc8/0x100
  [  168.989409] [c000000fe1383780] [c00000000003ed78] doorbell_exception+0xa8/0xe0
  [  168.989488] [c000000fe13837b0] [c000000000003314] h_doorbell_common+0x114/0x180
  [  168.989567] --- interrupt: e81 at osq_lock+0xb8/0x1f0
  [  168.989567]     LR = mutex_optimistic_spin+0xdc/0x280
  [  168.989656] [c000000fe1383aa0] [c00000000013e280] add_timer_on+0xc0/0x160 (unreliable)
  [  168.989734] [c000000fe1383ad0] [c000000000116f4c] mutex_optimistic_spin+0xdc/0x280
  [  168.989813] [c000000fe1383b30] [c000000000a60d04] __mutex_lock_slowpath+0x54/0x1f0
  [  168.989891] [c000000fe1383bb0] [c000000000a60f18] mutex_lock+0x78/0xa0
  [  168.989959] [c000000fe1383be0] [c0000000008965bc] od_dbs_timer+0x7c/0x1d0
  [  168.990026] [c000000fe1383c50] [c0000000000d6434] process_one_work+0x1a4/0x4c0
  [  168.990104] [c000000fe1383ce0] [c0000000000d68e4] worker_thread+0x194/0x600
  [  168.990171] [c000000fe1383d80] [c0000000000de700] kthread+0x110/0x130
  [  168.990239] [c000000fe1383e30] [c0000000000094f4] ret_from_kernel_thread+0x5c/0x68
  [  168.990316] Instruction dump:
  [  168.990349] 614a0d00 7d484838 2fa80000 409e029c 3f200021 3b800001 63390d00 408200a4 
  [  168.990461] e93b0022 82ff0018 ebdf0010 92e10078 <7fda492a> a1210078 3929ffff 79290420 
  [  168.990618] ---[ end trace bd509c1e05c7f71f ]---

  
  This seems to not happen in VMs running on ppc64el, and doesn't occur on x86_64. I've also tested latest mainline tree and it also occurs.

  [Test Case]

  # apt-get install openvswitch-switch
  # ip link add type veth peer name testveth0
  # ovs-vsctl add-br integbr

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