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Subjectoops when doing stupid thing
Hi, i got the following oops, to obtain it i've done something stupid:
i'm using quite frequently a serial console, today my computer was
already running,
i've unplugged the serial console and have plugged a modem instead, and
then the oops.
That's not really a bad oops as it takes me 20 minutes to figure. I'd
rather say that it's me
who is stupid, but may my stupidy lead to an oops ?

Oct 22 18:23:33 Djinn kernel: NMI Watchdog detected LOCKUP on CPU1,
registers:
Oct 22 18:23:33 Djinn kernel: CPU: 1
Oct 22 18:23:33 Djinn kernel: EIP: 0010:[serial_in+55/60]
Oct 22 18:23:33 Djinn kernel: EFLAGS: 00200002
Oct 22 18:23:33 Djinn kernel: eax: 00000301 ebx: 000a535f ecx:
0000001e edx: 000003fd
Oct 22 18:23:33 Djinn kernel: esi: c026e34b edi: c027fa80 ebp:
c026e34c esp: c4001f54
Oct 22 18:23:33 Djinn kernel: ds: 0018 es: 0018 ss: 0018
Oct 22 18:23:33 Djinn kernel: Process cc1 (pid: 2247,
stackpage=c4001000)
Oct 22 18:23:33 Djinn kernel: Stack: c01788b8 c027fa80 00000005 c0226700
0000001b c026e346 c026e361 00000006
Oct 22 18:23:33 Djinn kernel: 00000005 c0119053 c0226700 c026e346
0000001b 00000000 0000002c ffffffff
Oct 22 18:23:33 Djinn kernel: 0862b138 00200082 00000001 c026e361
0000001e c01114bf c01e74a0 00000001
Oct 22 18:23:33 Djinn kernel: Call Trace: [serial_console_write+92/308]
[printk+291/368] [smp_error_interrupt+67/72]
[call_spurious_interrupt+12800/31336] [call_error_interrupt+5/12]
Oct 22 18:23:33 Djinn kernel: Code: 0f b6 c0 c3 90 53 8b 54 24 08 8b 44
24 0c 8b 5c 24 10 83 7a
Using defaults from ksymoops -t elf32-i386 -a i386

Code; 00000000 Before first symbol
00000000 <_EIP>:
Code; 00000000 Before first symbol
0: 0f b6 c0 movzbl %al,%eax
Code; 00000003 Before first symbol
3: c3 ret
Code; 00000004 Before first symbol
4: 90 nop
Code; 00000005 Before first symbol
5: 53 push %ebx
Code; 00000006 Before first symbol
6: 8b 54 24 08 mov 0x8(%esp,1),%edx
Code; 0000000a Before first symbol
a: 8b 44 24 0c mov 0xc(%esp,1),%eax
Code; 0000000e Before first symbol
e: 8b 5c 24 10 mov 0x10(%esp,1),%ebx
Code; 00000012 Before first symbol
12: 83 7a 00 00 cmpl $0x0,0x0(%edx)


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