Jan Engelhardt wrote:
Make your own initrd and put a bash into it. Then start that, e.g. (for
our linux live cd), initrd=initrd.sqfs root=/dev/ram0 init=/bin/bash
I have tried these kernel parameters:
init=/bin/bash
init=/linuxrc
init=/init
init=/sbin/init
None works.
What's the error message?
No error message at all. System seems freezed after spit out this message:
Freeing unused kernel memory: 136k freed
The console echos the keyboard inputs.
It seems that the init started successfully: I attached the output
of "info threads" and "backtrace" after the system freezing.
I am digging the source these days and try to find out if the init
process has really been started. I found some difference between
the normal init process and the freezed init process:
----------------------------------------------------------------
| Normal init | Freezed init
----------------------------------------------------------------
mm->total_vm | 0x145 | 0x1e
mm->map_count | 9 | 5
----------------------------------------------------------------
Maybe, init is not loaded completely? Or just loaded an invalid one?
I am trying to dump the text segment at user space 0x08040000 of the
init process. But I have not found the way to find the related kernel
space address. Any clue? Thanks! :)
Also, after some google, I found that the format of initrd has changed.
I also tried a new initrd with cpio format. The kernel recognized it:
cpio initrd's (aka initramfs) are new - the "old style" initrd where you
`mksquasfs mydir initrd.sqfs` (see above) continues to work, though.
After the kernel start, I add breakpoints at cpu_idle and do_schedule.
cpu_idle never reached, only do_schedule did. Is that strange?
Until pid 1 is started, the cpu should never be idle.
Jan Engelhardt
It seems that the init process is started:
(gdb) info threads
11 Thread 123 (kseriod) 0xc032d485 in do_schedule () at
/kernel/via/kgdb/kernel/sched.c:923
10 Thread 9 (aio/0) 0xc032d485 in do_schedule () at
/kernel/via/kgdb/kernel/sched.c:923
9 Thread 8 (kswapd0) 0xc032d485 in do_schedule () at
/kernel/via/kgdb/kernel/sched.c:923
8 Thread 7 (pdflush) 0xc032d485 in do_schedule () at
/kernel/via/kgdb/kernel/sched.c:923
7 Thread 6 (pdflush) 0xc032d485 in do_schedule () at
/kernel/via/kgdb/kernel/sched.c:923
6 Thread 5 (khelper) 0xc032d485 in do_schedule () at
/kernel/via/kgdb/kernel/sched.c:923
5 Thread 4 (kblockd/0) 0xc032d485 in do_schedule () at
/kernel/via/kgdb/kernel/sched.c:923
4 Thread 3 (events/0) 0xc032d485 in do_schedule () at
/kernel/via/kgdb/kernel/sched.c:923
3 Thread 2 (ksoftirqd/0) 0xc032d485 in do_schedule () at
/kernel/via/kgdb/kernel/sched.c:923
* 2 Thread 1 (init) breakpoint () at /kernel/via/kgdb/kernel/kgdb.c:1212
1 Thread 32768 (Shadow task 0 for pid 0) 0xc032d485 in do_schedule
() at /kernel/via/kgdb/kernel/sched.c:923
(gdb) bt
#0 breakpoint () at /kernel/via/kgdb/kernel/kgdb.c:1212
#1 0xc774fec4 in ?? ()
#2 0xc010893b in do_IRQ (regs=
{ebx = -948641792, ecx = -948577792, edx = -944260388, esi = 0,
edi = -948641792, ebp = -948633844, eax = -944260388, xds = 123, xes =
123, orig_eax = -252, eip = -1072517263, xcs = 96, eflags = 646, esp =
-948633660, xss = -948576428})
at /kernel/via/kgdb/arch/i386/kernel/irq.c:574
#3 0xc0106888 in common_interrupt ()
#4 0xc01063f6 in do_signal (regs=0xc774e000, oldset=0x0) at
/kernel/via/kgdb/arch/i386/kernel/signal.c:581
#5 0xc01064d9 in do_notify_resume (regs=0xc774ffc4, oldset=0x0,
thread_info_flags=1)
at /kernel/via/kgdb/arch/i386/kernel/signal.c:629
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