Messages in this thread | | | Date | Mon, 14 Dec 2009 16:41:54 +0530 | From | Sachin Sant <> | Subject | Re: [Next] CPU Hotplug test failures on powerpc |
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Peter Zijlstra wrote: > On Fri, 2009-12-11 at 16:23 +0530, Sachin Sant wrote: > >> While executing cpu_hotplug(from autotest) tests against latest >> next on a power6 box, the machine locks up. A soft reset shows >> the following trace >> >> cpu 0x0: Vector: 100 (System Reset) at [c00000000c9333d0] >> pc: c0000000003433d8: .find_next_bit+0x54/0xc4 >> lr: c000000000342f10: .cpumask_next_and+0x4c/0x94 >> sp: c00000000c933650 >> msr: 8000000000089032 >> current = 0xc00000000c173840 >> paca = 0xc000000000bc2600 >> pid = 2602, comm = hotplug06.top.s >> enter ? for help >> [link register ] c000000000342f10 .cpumask_next_and+0x4c/0x94 >> [c00000000c933650] c0000000000e9f34 .cpuset_cpus_allowed_locked+0x38/0x74 (unreliable) >> [c00000000c9336e0] c000000000090074 .move_task_off_dead_cpu+0xc4/0x1ac >> [c00000000c9337a0] c0000000005e4e5c .migration_call+0x304/0x830 >> [c00000000c933880] c0000000005e0880 .notifier_call_chain+0x68/0xe0 >> [c00000000c933920] c00000000012a92c ._cpu_down+0x210/0x34c >> [c00000000c933a90] c00000000012aad8 .cpu_down+0x70/0xa8 >> [c00000000c933b20] c000000000525940 .store_online+0x54/0x894 >> [c00000000c933bb0] c000000000463430 .sysdev_store+0x3c/0x50 >> [c00000000c933c20] c0000000001f8320 .sysfs_write_file+0x124/0x18c >> [c00000000c933ce0] c00000000017edac .vfs_write+0xd4/0x1fc >> [c00000000c933d80] c00000000017efdc .SyS_write+0x58/0xa0 >> [c00000000c933e30] c0000000000085b4 syscall_exit+0x0/0x40 >> --- Exception: c01 (System Call) at 00000fff9fa8a8f8 >> SP (fffe7aef200) is in userspace >> 0:mon> e >> cpu 0x0: Vector: 100 (System Reset) at [c00000000c9333d0] >> pc: c0000000003433d8: .find_next_bit+0x54/0xc4 >> lr: c000000000342f10: .cpumask_next_and+0x4c/0x94 >> sp: c00000000c933650 >> msr: 8000000000089032 >> current = 0xc00000000c173840 >> paca = 0xc000000000bc2600 >> pid = 2602, comm = hotplug06.top.s >> >> Last few messages from the dmesg log shows >> > > > >> After some debugging a possible suspect seems to be commit >> 6ad4c18.. : sched: Fix balance vs hotplug race >> > > > Oh, wonderful :-/ > > So what is that thing whining about? Not being able to read a cpumask or > something? > > Does your .config have cpusets enabled (there's a different > cpuset_cpus_allowed_locked implementation depending on that)? > Yes CPUSETS config is enabled. I have attached the config.
Thanks -Sachin
> I know of at least one remaining race and am working on closing that, > but I'm not sure I can explain this crash with that. > >
--
--------------------------------- Sachin Sant IBM Linux Technology Center India Systems and Technology Labs Bangalore, India ---------------------------------
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