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    SubjectRe: Boot failure with next-20120208
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    On 2/13/2012 12:05 PM, Andrew Morton wrote:
    > On Mon, 13 Feb 2012 06:18:34 -0800 Arjan van de Ven
    > <arjan@linux.intel.com> wrote:
    >
    >> On 2/12/2012 7:04 PM, Michael Neuling wrote:
    >>>> Just a quick note to say I got a boot OOPs with next-20120208
    >>>> and 9 on a Power7 blade (my other PowerPC boot tests are ok.
    >>>> I'll investigate this further on Monday.
    >
    > Thanks for testing linux-next. Very useful.
    >
    >>>> The line referenced below is:
    >>>>
    >>>> BUG_ON(!kobj || !kobj->sd || !attr);
    >>>>
    >>>> in sysfs_create_file().
    >
    > Yes, this is exactly why we should never use BUG_ON(a || b). We
    > don't know which of those three expressions triggered.
    >
    >>>> calling .topology_init+0x0/0x1ac @ 1 initcall
    >>>> 7_.async_cpu_up+0x0/0x40 returned 0 after 9765 usecs
    >>>> async_continuing @ 20 after 9765 usec ------------[ cut here
    >>>> ]------------ kernel BUG at fs/sysfs/file.c:573! Oops:
    >>>> Exception in kernel mode, sig: 5 [#1] SMP NR_CPUS=32 NUMA
    >>>> pSeries Modules linked in: NIP: c00000000024a35c LR:
    >>>> c0000000004ee050 CTR: c00000000083ca24 REGS: c0000003fd9e7560
    >>>> TRAP: 0700 Not tainted (3.3.0-rc2-autokern1) MSR:
    >>>> 8000000000029032 <SF,EE,ME,IR,DR,RI> CR: 88002082 XER:
    >>>> 0000000f CFAR: c00000000024a370 TASK = c0000003fd9e8000[20]
    >>>> 'kworker/u:6' THREAD: c0000003fd9e4000 CPU: 0 GPR00:
    >>>> 0000000000000001 c0000003fd9e77e0 c000000000d19bb8
    >>>> 0000000000000000 GPR04: c000000000bf37a8 0000000000000008
    >>>> 8000000002096400 0000000000000000 GPR08: 0000000000000000
    >>>> c000000000f80028 c000000000d52bd8 0000000000000000 GPR12:
    >>>> 0000000048002088 c00000000f33b000 0000000001affa78
    >>>> 00000000009aa000 GPR16: 0000000000e1f3c8 0000000002d517f0
    >>>> 0000000001aff984 0000000000000060 GPR20: 0000000000000000
    >>>> ffffffffffffffff 0000000000000000 c000000000c45128 GPR24:
    >>>> 0000000000000000 0000000000000008 0000000000000000
    >>>> c000000000c44200 GPR28: c000000000f80028 0000000000000008
    >>>> c000000000c85038 0000000000000002 NIP [c00000000024a35c]
    >>>> .sysfs_create_file+0x1c/0x40 LR [c0000000004ee050]
    >>>> .device_create_file+0x20/0x40 Call Trace: [c0000003fd9e77e0]
    >>>> [c0000003fd9e78a0] 0xc0000003fd9e78a0 (unreliable)
    >>>> [c0000003fd9e7850] [c00000000083c9a4]
    >>>> .register_cpu_online+0x1d0/0x250 [c0000003fd9e7900]
    >>>> [c00000000083ca8c] .sysfs_cpu_notify+0x68/0x28c
    >>>> [c0000003fd9e79b0] [c00000000083769c]
    >>>> .notifier_call_chain+0x9c/0x100 [c0000003fd9e7a50]
    >>>> [c0000000000a5878] .__cpu_notify+0x38/0x80 [c0000003fd9e7ad0]
    >>>> [c00000000083e124] ._cpu_up+0x10c/0x178 [c0000003fd9e7b90]
    >>>> [c00000000083e2c8] .cpu_up+0x138/0x164 [c0000003fd9e7c20]
    >>>> [c000000000ba46d0] .async_cpu_up+0x28/0x40 [c0000003fd9e7ca0]
    >>>> [c0000000000d81ec] .async_run_entry_fn+0xbc/0x1f0
    >>>> [c0000003fd9e7d50] [c0000000000c7cbc]
    >>>> .process_one_work+0x19c/0x590 [c0000003fd9e7e10]
    >>>> [c0000000000c8618] .worker_thread+0x188/0x4b0
    >>>> [c0000003fd9e7ed0] [c0000000000ce57c] .kthread+0xbc/0xd0
    >>>> [c0000003fd9e7f90] [c000000000021448]
    >>>> .kernel_thread+0x54/0x70 Instruction dump: 7fa3eb78 ebe1fff8
    >>>> eba1ffe8 7c0803a6 4e800020 2c230000 41820024 e8630030
    >>>> 7c800074 7800d182 2fa30000 419e0014 <0b000000> 38a00002
    >>>> 4bfffebc e8630030 ---[ end trace 31fd0ba7d8756001 ]---
    >>>> initcall .topology_init+0x0/0x1ac returned 0 after 0 usecs
    >>>> calling .pcibios_init+0x0/0xe8 @ 1 PCI: Probing PCI
    >>>> hardware PCI: Probing PCI hardware done initcall
    >>>> .pcibios_init+0x0/0xe8 returned 0 after 0 usecs calling
    >>>> .add_system_ram_resources+0x0/0x140 @ 1 initcall
    >>>> .add_system_ram_resources+0x0/0x140 returned 0 after 0 usecs
    >>>> calling
    >>>> .__machine_initcall_powermac_pmac_i2c_create_platform_devices+0x0/0xc8
    >>>> @ 1 initcall
    >>>> .__machine_initcall_powermac_pmac_i2c_create_platform_devices+0x0/0xc8
    >>>> returned 0 after 0 usecs calling .opal_init+0x0/0x1cc @ 1
    >>>> opal: Node not found initcall .opal_init+0x0/0x1cc returned
    >>>> -19 after 0 usecs calling
    >>>> .__machine_initcall_pseries_ioei_init+0x0/0xa0 @ 1
    >>>
    >>> Reverting "smp: start up non-boot CPUs asynchronously"
    >>> (8de7a96405 from next-20120208) fixes this problem for me.
    >>>
    >> if that fixes it, it means PPC has a race somewhere in the cpu
    >> hotplug code, since all the patch does is hotplug the cpus one by
    >> one (which the normal kernel also does, just not in parallel with
    >> other work)
    >
    > The bug looks pretty generic, nothing very PPC-specific there. It
    > might affect other architectures - we won't know until we find out
    > wht caused it.

    well one half of the race looks pretty generic...
    ..... doesn't mean the other half of the race is though....


    >
    > Ho hum, I suppose I should pull the patch out of linux-next, to
    > avoid disrupting other testing. This means it's going to be hard
    > to get the bug fixed.

    it means losing this one big PPC machine indeed.... until they hit
    that same race some other way with regular real cpu hotplug ;-(
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