kgdb Bad IO access (was: 2.6.22-rc6-mm1)

[Tilman Schmidt <tilman@imap.cc>]

Andrew Morton schrieb:
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.22-rc6/2.6.22-rc6-mm1/
> 
> - Added the kgdb tree, as git-kgdb.patch (Jason Wessel
>   <jason.wessel@windriver.com>)
> 
>   This is a large patch which unifies all the various kgdb stubs lying
>   around various architectures and extends kgdb support to other
>   architectures.  Supported architectures are at present arm, i386, ia64,
>   mips, ppc32, ppc64, sh, and x86_64.
> 
>   Subject to review, we're aiming this at 2.6.24.

Built a kernel with this just for fun on a Pentium D 940 system running
a 32 bit install of SuSE 10.2. It complained thusly relatively early
during startup:

--------8<--------8<--------8<--------8<--------8<--------8<--------8<
Bad IO access at port 10000 (outb(val,port))
WARNING: at lib/iomap.c:44 bad_io_access()
 [dump_trace+99/475] dump_trace+0x63/0x1db
 [show_trace_log_lvl+26/47] show_trace_log_lvl+0x1a/0x2f
 [show_trace+18/20] show_trace+0x12/0x14
 [dump_stack+22/24] dump_stack+0x16/0x18
 [bad_io_access+84/86] bad_io_access+0x54/0x56
 [iowrite8+52/54] iowrite8+0x34/0x36
 [kgdb8250_uart_init+164/609] kgdb8250_uart_init+0xa4/0x261
 [kgdb_init_io+172/200] kgdb_init_io+0xac/0xc8
 [kgdb_late_entry+54/164] kgdb_late_entry+0x36/0xa4
 [kernel_init+346/732] kernel_init+0x15a/0x2dc
 [kernel_thread_helper+7/16] kernel_thread_helper+0x7/0x10
 =======================
Bad IO access at port 10000 (return inb(port))
WARNING: at lib/iomap.c:44 bad_io_access()
 [dump_trace+99/475] dump_trace+0x63/0x1db
 [show_trace_log_lvl+26/47] show_trace_log_lvl+0x1a/0x2f
 [show_trace+18/20] show_trace+0x12/0x14
 [dump_stack+22/24] dump_stack+0x16/0x18
 [bad_io_access+84/86] bad_io_access+0x54/0x56
 [ioread8+40/47] ioread8+0x28/0x2f
 [kgdb8250_uart_init+334/609] kgdb8250_uart_init+0x14e/0x261
 [kgdb_init_io+172/200] kgdb_init_io+0xac/0xc8
input: AT Translated Set 2 keyboard as /class/input/input1
 [kgdb_late_entry+54/164] kgdb_late_entry+0x36/0xa4
 [kernel_init+346/732] kernel_init+0x15a/0x2dc
 [kernel_thread_helper+7/16] kernel_thread_helper+0x7/0x10
 =======================
Bad IO access at port 10000 (outb(val,port))
WARNING: at lib/iomap.c:44 bad_io_access()
 [dump_trace+99/475] dump_trace+0x63/0x1db
 [show_trace_log_lvl+26/47] show_trace_log_lvl+0x1a/0x2f
 [show_trace+18/20] show_trace+0x12/0x14
 [dump_stack+22/24] dump_stack+0x16/0x18
 [bad_io_access+84/86] bad_io_access+0x54/0x56
 [iowrite8+52/54] iowrite8+0x34/0x36
 [kgdb8250_uart_init+164/609] kgdb8250_uart_init+0xa4/0x261
 [kgdb8250_late_init+32/153] kgdb8250_late_init+0x20/0x99
 [kgdb_late_entry+136/164] kgdb_late_entry+0x88/0xa4
 [kernel_init+346/732] kernel_init+0x15a/0x2dc
 [kernel_thread_helper+7/16] kernel_thread_helper+0x7/0x10
 =======================
Bad IO access at port 10000 (return inb(port))
WARNING: at lib/iomap.c:44 bad_io_access()
 [dump_trace+99/475] dump_trace+0x63/0x1db
 [show_trace_log_lvl+26/47] show_trace_log_lvl+0x1a/0x2f
 [show_trace+18/20] show_trace+0x12/0x14
 [dump_stack+22/24] dump_stack+0x16/0x18
 [bad_io_access+84/86] bad_io_access+0x54/0x56
 [ioread8+40/47] ioread8+0x28/0x2f
 [kgdb8250_uart_init+334/609] kgdb8250_uart_init+0x14e/0x261
 [kgdb8250_late_init+32/153] kgdb8250_late_init+0x20/0x99
 [kgdb_late_entry+136/164] kgdb_late_entry+0x88/0xa4
 [kernel_init+346/732] kernel_init+0x15a/0x2dc
 [kernel_thread_helper+7/16] kernel_thread_helper+0x7/0x10
 =======================
KGDB failed to request the serial IRQ (0)
registered taskstats version 1
Freeing unused kernel memory: 236k freed
--------8<--------8<--------8<--------8<--------8<--------8<--------8<

Apart from that, the kernel runs fine, though its subjectively a bit
sluggish compared to 2.6.22-rc6-mm1 without kgdb. Its uname -a is:
Linux xenon 2.6.22-rc6-mm1-test4 #10 SMP PREEMPT Thu Jul 5 23:41:32 CEST 2007 i686 i686 i386 GNU/Linux
I didn't even try to actually do anything with kgdb, though.

The .config delta is:

--- good.config-3       2007-07-05 22:35:30.000000000 +0200
+++ .config     2007-07-05 23:23:09.000000000 +0200
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
 # Linux kernel version: 2.6.22-rc6-mm1
-# Thu Jul  5 22:05:32 2007
+# Thu Jul  5 23:23:09 2007
 #
 CONFIG_X86_32=y
 CONFIG_GENERIC_TIME=y
@@ -35,7 +35,7 @@
 #
 # General setup
 #
-CONFIG_LOCALVERSION="-test3"
+CONFIG_LOCALVERSION="-test4"
 CONFIG_LOCALVERSION_AUTO=y
 CONFIG_SWAP=y
 CONFIG_SWAP_PREFETCH=y
@@ -2529,8 +2529,24 @@
 CONFIG_FAIL_MAKE_REQUEST=y
 CONFIG_FAULT_INJECTION_DEBUG_FS=y
 CONFIG_FAULT_INJECTION_STACKTRACE_FILTER=y
-# CONFIG_WANT_EXTRA_DEBUG_INFORMATION is not set
-# CONFIG_KGDB is not set
+CONFIG_WANT_EXTRA_DEBUG_INFORMATION=y
+CONFIG_KGDB=y
+# CONFIG_KGDB_CONSOLE is not set
+# CONFIG_KGDB_ONLY_MODULES is not set
+CONFIG_KGDB_8250_NOMODULE=y
+# CONFIG_KGDBOE_NOMODULE is not set
+# CONFIG_KGDB_MPSC is not set
+# CONFIG_KGDB_CPM_UART is not set
+# CONFIG_KGDB_SIBYTE is not set
+# CONFIG_KGDB_TXX9 is not set
+# CONFIG_KGDB_SH_SCI is not set
+# CONFIG_KGDB_AMBA_PL011 is not set
+# CONFIG_KGDB_PXA_SERIAL is not set
+# CONFIG_KGDBOE is not set
+CONFIG_KGDB_8250=y
+CONFIG_KGDB_SIMPLE_SERIAL=y
+CONFIG_KGDB_BAUDRATE=115200
+CONFIG_KGDB_PORT_NUM=1
 CONFIG_EARLY_PRINTK=y
 CONFIG_DEBUG_STACKOVERFLOW=y
 CONFIG_DEBUG_STACK_USAGE=y


HTH
T.

-- 
Tilman Schmidt                    E-Mail: tilman@imap.cc
Bonn, Germany
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