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I'm trying to switch to a process with the following code :

===================================================================
    printk ("Switching to process %s with cr3 at 0x%x\n",
            current_process->name,
    current_process->cr3) ;

            // Set the page repertory address
            set_cr3 (current_process->cr3) ;

    printk ("CR3 is set to: 0x%x\n",
            get_cr3 ()) ;

    // eoi () ;

    // Jump to the code
    asm ("ljmp $0x08, $0x300000") ;

===================================================================

At this point, cr3 is correctly set to 0x10d000, the cr3 for the process. But when I'm trying to jump, with the jump instrunction to 0x300000 a page exception occurs:

===================================================================
Kernel panic: Page fault asking 0x300000 (cr2) with cr3: 0x106984.
===================================================================

I don't know why the cr3 was changed, 0x106984 is some point in my kernel stack.

Did you flush the TLB?