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SubjectRe: 2.6.8.1-mm1
From
Date
I can consistently hit this BUG_ON in migration_call's CPU_DEAD handling
by doing:

while true ; do
echo 0 > /sys/devices/system/cpu/cpu1/online
echo 1 > /sys/devices/system/cpu/cpu1/online
done

and then starting a kernel build. It seems to take less than 20
minutes. I can also recreate it on ppc64, but only with
CONFIG_PREEMPT=y (I haven't tried without preempt on i386 yet).

kernel BUG at kernel/sched.c:4035!
invalid operand: 0000 [#1]
PREEMPT SMP
Modules linked in:
CPU: 0
EIP: 0060:[<c0122b1b>] Not tainted VLI
EFLAGS: 00010202 (2.6.8.1-mm1)
EIP is at migration_call+0x1bb/0x300
eax: 00000001 ebx: c1410f60 ecx: 00000000 edx: deee8ec8
esi: deee8000 edi: 00000001 ebp: deee8ee0 esp: deee8eb8
ds: 007b es: 007b ss: 0068
Process bash (pid: 2956, threadinfo=deee8000 task=df448150)
Stack: deee8ed4 de6f6630 de6f6630 deee8ed4 00000296 deee8ee4 00000296 c04a5b78
00000001 00000006 deee8ef4 c0136928 deee8000 00000001 c04a7a40 deee8f2c
c01405ac c01a8d79 c04f5700 00000000 deee8000 00000001 00000001 000000ff
Call Trace:
[<c01082ea>] show_stack+0x7a/0x90
[<c0108472>] show_registers+0x152/0x1c0
[<c01086a0>] die+0x110/0x200
[<c0108b99>] do_invalid_op+0xe9/0xf0
[<c0107ed9>] error_code+0x2d/0x38
[<c0136928>] notifier_call_chain+0x28/0x50
[<c01405ac>] cpu_down+0x11c/0x230
[<c02a5d98>] store_online+0x38/0x40
[<c02a3117>] sysdev_store+0x37/0x40
[<c01a8b8e>] flush_write_buffer+0x2e/0x40
[<c01a8bea>] sysfs_write_file+0x4a/0x60
[<c016b362>] vfs_write+0xa2/0x100
[<c016b471>] sys_write+0x41/0x70
[<c010746f>] syscall_call+0x7/0xb
Code: 0b cd 0f 6f 54 43 c0 eb 8e c7 04 24 6f 34 43 c0 b8 54 2a 12 c0 89 44 24 04
e8 e2 3f 00 00 0f 0b 89 00 82 d4 42 c0 e9 4a ff ff ff <0f> 0b c3 0f 6f 54 43 c0
e9 2c ff ff ff e8 53 87 2f 00 e9 17 ff

Nathan

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