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[Bug 1425202] [NEW] ISST-LTE: Ubuntu 15.04 lpar crashes at iommu_free_table after adapter DLPAR operation

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Launchpad Bug Tracker <1425202@xxxxxxxxxxxxxxxxxx>
Date: Tue, 24 Feb 2015 18:08:22 -0000
Reply-to: Bug 1425202 <1425202@xxxxxxxxxxxxxxxxxx>
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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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: architecture-ppc64le bugnameltc-121306 severity-critical targetmilestone-inin1504
-- 
ISST-LTE: Ubuntu 15.04 lpar crashes at iommu_free_table after adapter DLPAR operation
https://bugs.launchpad.net/bugs/1425202
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