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[Bug 1425202] Comment bridged from LTC Bugzilla

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Date: Fri, 13 Mar 2015 14:30:24 -0000
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------- Comment From chavez@xxxxxxxxxx 2015-03-13 14:23 EDT-------
*** Bug 122738 has been marked as a duplicate of this bug. ***

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https://bugs.launchpad.net/bugs/1425202

Title:
  ISST-LTE: Ubuntu 15.04 lpar crashes at iommu_free_table after adapter
  DLPAR operation

Status in linux package in Ubuntu:
  Triaged

Bug description:
  Description:
  ------------------------

  I have installed all packages required for DLPAR in Ubuntu 15.04. When
  i am trying to do network adapter DLPAR operation, lpar crashes.

  root@highlp1:/etc/network# [  454.482742] kernel BUG at /build/buildd/linux-3.18.0/arch/powerpc/kernel/iommu.c:732!
  cpu 0xa: Vector: 700 (Program Check) at [c00000016e67f850]
      pc: c000000000040484: iommu_free_table+0x64/0x140
      lr: c00000000004047c: iommu_free_table+0x5c/0x140
      sp: c00000016e67fad0
     msr: 8000000000029033
    current = 0xc00000016b4277e0
    paca    = 0xc000000007b35a00   softe: 0        irq_happened: 0x01
      pid   = 3288, comm = drmgr
  kernel BUG at /build/buildd/linux-3.18.0/arch/powerpc/kernel/iommu.c:732!
  enter ? for help
  [c00000016e67fb40] c000000000083428 iommu_reconfig_notifier+0x88/0x160
  [c00000016e67fb70] c0000000000dab38 notifier_call_chain+0x98/0x100
  [c00000016e67fbc0] c0000000000db244 __blocking_notifier_call_chain+0x74/0xe0
  [c00000016e67fc10] c000000000877290 of_reconfig_notify+0x40/0xa0
  [c00000016e67fc40] c000000000877cdc of_detach_node+0x8c/0xb0
  [c00000016e67fc70] c0000000000809b8 ofdt_write+0x1f8/0x7b0
  [c00000016e67fd40] c0000000003459f0 proc_reg_write+0xb0/0x110
  [c00000016e67fd90] c0000000002b950c vfs_write+0xdc/0x260
  [c00000016e67fde0] c0000000002ba0ac SyS_write+0x6c/0x110
  [c00000016e67fe30] c00000000000927c syscall_exit+0x0/0x7c
  --- Exception: c01 (System Call) at 00001000001ba638
  SP (3fffdba63300) is in userspace
  a:mon>
  a:mon>
  a:mon>
  a:mon> t
  [c00000016e67fb40] c000000000083428 iommu_reconfig_notifier+0x88/0x160
  [c00000016e67fb70] c0000000000dab38 notifier_call_chain+0x98/0x100
  [c00000016e67fbc0] c0000000000db244 __blocking_notifier_call_chain+0x74/0xe0
  [c00000016e67fc10] c000000000877290 of_reconfig_notify+0x40/0xa0
  [c00000016e67fc40] c000000000877cdc of_detach_node+0x8c/0xb0
  [c00000016e67fc70] c0000000000809b8 ofdt_write+0x1f8/0x7b0
  [c00000016e67fd40] c0000000003459f0 proc_reg_write+0xb0/0x110
  [c00000016e67fd90] c0000000002b950c vfs_write+0xdc/0x260
  [c00000016e67fde0] c0000000002ba0ac SyS_write+0x6c/0x110
  [c00000016e67fe30] c00000000000927c syscall_exit+0x0/0x7c
  --- Exception: c01 (System Call) at 00001000001ba638
  SP (3fffdba63300) is in userspace

  a:mon> e
  cpu 0xa: Vector: 700 (Program Check) at [c00000016e67f850]
      pc: c000000000040484: iommu_free_table+0x64/0x140
      lr: c00000000004047c: iommu_free_table+0x5c/0x140
      sp: c00000016e67fad0
     msr: 8000000000029033
    current = 0xc00000016b4277e0
    paca    = 0xc000000007b35a00   softe: 0        irq_happened: 0x01
      pid   = 3288, comm = drmgr
  kernel BUG at /build/buildd/linux-3.18.0/arch/powerpc/kernel/iommu.c:732!

  
  Original patch posted https://lists.ozlabs.org/pipermail/linuxppc-dev/2015-February/125068.html

  Updated patch posted as: https://lists.ozlabs.org/pipermail/linuxppc-
  dev/2015-February/125133.html

  Will update again once merged into mpe's tree.

  -Nish

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