Hello, Abdul.

Sorry about the long delay.

On Mon, Jun 12, 2017 at 04:53:42PM +0530, Abdul Haleem wrote:

linux-next kernel crashed while running CPU offline and online.

Machine: Power 8 LPAR
Kernel : 4.12.0-rc4-next-20170609
gcc : version 5.2.1
config: attached
testcase: CPU off/on

for i in $(seq 100);do 
    for j in $(seq 0 15);do 
        echo 0 >  /sys/devices/system/cpu/cpu$j/online
        sleep 5
        echo 1 > /sys/devices/system/cpu/cpu$j/online
    done
done

...

NIP [c0000000001d6868] cpuset_can_attach+0x58/0x1b0

Can you please map this to the source line?

LR [c0000000001d6858] cpuset_can_attach+0x48/0x1b0
Call Trace:
[c00000000c72b9a0] [c0000000001d6858] cpuset_can_attach+0x48/0x1b0
(unreliable)
[c00000000c72ba00] [c0000000001cbe80] cgroup_migrate_execute+0xb0/0x450
[c00000000c72ba80] [c0000000001d3754] cgroup_transfer_tasks+0x1c4/0x360
[c00000000c72bba0] [c0000000001d923c] cpuset_hotplug_workfn+0x86c/0xa20
[c00000000c72bca0] [c00000000011aa44] process_one_work+0x1e4/0x580
[c00000000c72bd30] [c00000000011ae78] worker_thread+0x98/0x5c0
[c00000000c72bdc0] [c000000000124058] kthread+0x168/0x1b0
[c00000000c72be30] [c00000000000b2e8] ret_from_kernel_thread+0x5c/0x74
Instruction dump:
f821ffa1 7c7d1b78 60000000 60000000 38810020 7fa3eb78 3f42ffed 4bff4c25 
60000000 3b5a0448 3d420020 eb610020 <e9230960> 7f43d378 e9290000
f92af200 

Thanks.

-- 
tejun