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
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