http://bugzilla.kernel.org/show_bug.cgi?id=2349
[EMAIL PROTECTED] changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |[EMAIL PROTECTED]
------- Comment #4 from [EMAIL PROTECTED] 2007-10-11 13:34 -------
When using the kernel 2.6.20, this bug is not reproduced. I changed the code of
the arch/i386/kernel/process.c file as follows:
diff -u arch/i386/kernel/process.c.orig arch/i386/kernel/process.c
--- arch/i386/kernel/process.c.orig 2007-10-12 00:22:38.000000000 +0400
+++ arch/i386/kernel/process.c 2007-10-12 00:19:55.000000000 +0400
@@ -94,12 +94,25 @@
EXPORT_SYMBOL(enable_hlt);
+int codedot_oops = 0;
+EXPORT_SYMBOL(codedot_oops);
+
/*
* We use this if we don't have any better
* idle routine..
*/
void default_idle(void)
{
+ volatile struct s {
+ int s;
+ } *s = NULL;
+
+ if (codedot_oops) {
+ codedot_oops = 0;
+ printk(KERN_EMERG "I am going to crash\n");
+ ++s->s;
+ }
+
if (!hlt_counter && boot_cpu_data.hlt_works_ok) {
current_thread_info()->status &= ~TS_POLLING;
/*
After the kernel has booted, I installed my own module, which switches the
codedot_oops flag on. The kernel immediately reported an oops and a panic:
debian:~/oops# insmod oops.ko
[ 77.012000] Oops module is being installed
debian:~/oops# [ 77.054000] I am going to crash
[ 77.056000] BUG: unable to handle kernel NULL pointer dereference at virtual
address 00000000
[ 77.056000] printing eip:
[ 77.057000] c0101915
[ 77.057000] *pde = 00000000
[ 77.057000] Oops: 0000 [#1]
[ 77.057000] PREEMPT
[ 77.057000] Modules linked in: oops
[ 77.057000] CPU: 0
[ 77.057000] EIP: 0060:[<c0101915>] Not tainted VLI
[ 77.057000] EFLAGS: 00000282 (2.6.20 #8)
[ 77.057000] EIP is at default_idle+0x35/0x70
[ 77.057000] eax: 00000026 ebx: 00000800 ecx: c02eb420 edx: c02eb420
[ 77.057000] esi: 00099100 edi: c02ff000 ebp: 0036a007 esp: c0305fe0
[ 77.057000] ds: 007b es: 007b ss: 0068
[ 77.057000] Process swapper (pid: 0, ti=c0304000 task=c02e7380
task.ti=c0304000)
[ 77.057000] Stack: c02b90d8 c010119a c0306720 c02b6fe6 c0306250 00000000
c032cc40 00000000
[ 77.057000] Call Trace:
[ 77.057000] [<c010119a>] cpu_idle+0x3a/0x70
[ 77.057000] [<c0306720>] start_kernel+0x280/0x300
[ 77.057000] [<c0306250>] unknown_bootoption+0x0/0x250
[ 77.057000] =======================
[ 77.057000] Code: 75 16 a1 2c ca 32 c0 85 c0 75 09 80 3d 05 1f 30 c0 00 75
24 f3 90 58 c3 31 c0 a3 24 ca 32 c0 c7 04 24 d8 90 2b c0 e8 eb 37 01 00 <a1> 00
00 00 00 40 a3 00 00 00 00 eb ca 89 e0 25 00 e0 ff ff 83
[ 77.057000] EIP: [<c0101915>] default_idle+0x35/0x70 SS:ESP 0068:c0305fe0
[ 77.057000] <0>Kernel panic - not syncing: Attempted to kill the idle task!
[ 77.059000]
The system got freezed after that.
Can this bug be closed already?
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