Hi there
I get the problem with linux-2.6.15.5 kgdb patch
Kernel command line: ro root=LABEL=/ kgdbwait kgdb8250=io,0x3f8,115200,4
(the simple serial command line seems doesn't work even if I define the
KGDB_SIMPLE_SERIAL,I mean "kgdb8250=0,115200", it always use
kgdb8250_opt() to check if there are full 4 arguments)
Well,the output:
.....
[drm] Initialized drm 1.0.0 20040925
serio: i8042 AUX port at 0x60,0x64 irq 12
serio: i8042 KBD port at 0x60,0x64 irq 1
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
.....
Freeing unused kernel memory: 200k freed
Warning: unable to open an initial console.
SELinux: Disabled at runtime.
SELinux: Unregistering netfilter hooks
...
It report "unable to open an initial console" here,
So the target machine get off the host debug session and continue to
output message on its console.
Check again the host gdb session,I have to press CTRL+C to interrupt
it.seems the tty irq get crash.
The KGDB serial module has some thing wrong here?
*********************************************
Program received signal SIGTRAP, Trace/breakpoint trap.
breakpoint () at kernel/kgdb.c:1872
1872atomic_set(&kgdb_setting_breakpoint, 0);
(gdb) l
1867
1868atomic_set(&kgdb_setting_breakpoint, 1);
1869wmb();
1870BREAKPOINT();
1871wmb();
1872atomic_set(&kgdb_setting_breakpoint, 0);
1873}
1874
1875EXPORT_SYMBOL(breakpoint);
1876
(gdb) bt
#0 breakpoint () at kernel/kgdb.c:1872
#1 0xc0232b6b in kgdb8250_interrupt (irq=Variable "irq" is not
available.
) at drivers/serial/8250_kgdb.c:163
#2 0xc013b78e in handle_IRQ_event (irq=4, regs=0xc03a6fa4,
action=0xd8df0f20)
at kernel/irq/handle.c:88
#3 0xc013b845 in __do_IRQ (irq=4, regs=0xc03a6fa4) at
kernel/irq/handle.c:173
#4 0xc01052a6 in do_IRQ (regs=0xc03a6fa4) at arch/i386/kernel/irq.c:98
Previous frame inner to this frame (corrupt stack?)
(gdb)
#0 breakpoint () at kernel/kgdb.c:1872
#1 0xc0232b6b in kgdb8250_interrupt (irq=Variable "irq" is not
available.
) at drivers/serial/8250_kgdb.c:163
#2 0xc013b78e in handle_IRQ_event (irq=4, regs=0xc03a6fa4,
action=0xd8df0f20)
at kernel/irq/handle.c:88
#3 0xc013b845 in __do_IRQ (irq=4, regs=0xc03a6fa4) at
kernel/irq/handle.c:173
#4 0xc01052a6 in do_IRQ (regs=0xc03a6fa4) at arch/i386/kernel/irq.c:98
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