'Swapper' causes kernel crash. What causes it ??

Why does swapper cause kernel crash ?? -- Linux general technology-Linux technology and application information. For details, refer to the following section. My kernel is linux 2.6.34, the hardware is POWERPC8313, and two 10/100 m network ports are extended. When the extended network port is used for tcp communication,
The system crashes in about two days. Please help me analyze the following information. What may be the cause ??

BUG: soft lockup-CPU #0 stuck for 61 s! [Swapper: 0]
Modules linked in:
NIP: c01ff824 LR: c01ff7c0 CTR: c01ff798
REGS: c0403b70 TRAP: 0901 Not tainted (2.6.34)
MSR: 00009032 CR: 24002088 XER: 20000000
TASK = c03e2410 [0] 'swapper' THREAD: c0402000
Upl00: c004f520 c0403c20 c03e2410 00000001 cee85800 00001032 cf403000 00000038
GPRS 08: 00000000 cee85af8 00000001 00000001 00000000
Call Trace:
[C0403c20] [c01ffbac] 0xc01ffbac (unreliable)
[C040360] [c004f520] 0xc004f520
[C0403c80] [c00520a8] 0xc00520a8
[C0403c90] [c0006164] 0xc0006164
[C0403cb0] [c00114c8] 0xc00114c8
--- Exception: 501 at 0xc004f4f0
LR = 0xc00520a8
[C0403d70] [c0042c28] 0xc0042c28 (unreliable)
[C0403d90] [c00520a8] 0xc00520a8
[C0403da0] [c0006164] 0xc0006164
[C0403dc0] [c00114c8] 0xc00114c8
--- Exception: 501 at 0xc004f4f0
LR = 0xc00520a8
[C0403e80] [0ff37b25] 0xff37b25 (unreliable)
[C0403ea0] [c00520a8] 0xc00520a8
[C0403eb0] [c0006164] 0xc0006164
[C0403ed0] [c00114c8] 0xc00114c8
--- Exception: 501 at 0xc0008fb0
LR = 0xc0008fb0
[C0403f90] [c0008f60] 0xc0008f60 (unreliable)
[C0403fb0] [c0003e1c] 0xc0003e1c
[C0403fc0] [c03b5874] 0xc03b5874
[C0403ff0] [00003438] 0x003438