vfree 函数导致的oops

1. spin_lock_bh(&sip_lock);
   
2. ...release hash table...
   
3. vfree(hash table);
   
4. spin_unlock_bh(&sip_lock);

QUOTE:

Pid: 6622, comm: rmmod Not tainted (2.6.24.4 #33)
EIP: 0060:[<c01637e2>] EFLAGS: 00010206 CPU: 1
EIP is at vfree+0x12/0x22
EAX: d30f7000 EBX: d8af6f80 ECX: d8a77000 EDX: 0000001a
ESI: 0007ff88 EDI: 0000fff1 EBP: d30f7000 ESP: d30f7f40
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process rmmod (pid: 6622, ti=d30f7000 task=d5024580 task.ti=d30f7000)
Stack: d89f34f6 c01371d3 d79d2b00 c0145963 d89f4700 00000000 bf81c930 c0143daa
       69746e61 7474615f 006b7461 c014b4e6 bf81c930 00000081 40000003 d5024580
       bf81f178 00000880 00000000 d30f7fb8 c0107a16 00000880 0081f178 d89f4700

QUOTE:

/**
*        vfree  -  release memory allocated by vmalloc()
*        @addr:                memory base address
*
*        Free the virtually continuous memory area starting at @addr, as
*        obtained from vmalloc(), vmalloc_32() or __vmalloc(). If @addr is
*        NULL, no operation is performed.
*
*        Must not be called in interrupt context.
*/
void vfree(void *addr)
{
        BUG_ON(in_interrupt());
        __vunmap(addr, 1);
}

1. spin_lock_bh(&sip_lock);
   
2. ...release hash table...
   
3. spin_unlock_bh(&sip_lock);
   
4. vfree(hash table);