[Crash-utility] IKCONFIG initialize timing
Hi,
For xen domain dump image, read_in_kernel_config() calls
gdb_interface() like following backtrace, and crash exits with a fatal
error "crash: gdb_interface: gdb not initialized?".
#0 gdb_interface (req=0x83c54a0) at gdb_interface.c:301
#1 0x0810ef5c in datatype_info (name=0x8303513 "vcpu_guest_context",
member=0x8304b38 "ctrlreg", dm=0x0) at symbols.c:3648
#2 0x080fcff0 in x86_xendump_p2m_create (xd=0x83aaa80) at x86.c:4345
#3 0x081381ed in xc_core_p2m_create () at xendump.c:952
#4 0x08135bbb in xc_core_read (bufptr=0x8403be8, cnt=1568, addr=3223390688,
paddr=2165216) at xendump.c:131
#5 0x081372d9 in read_xendump (fd=-1, bufptr=0x8403be8, cnt=1568, addr=3223390688,
paddr=2165216) at xendump.c:663
#6 0x08095d07 in readmem (addr=3223390688, memtype=1, buffer=0x8403be8, size=32768,
type=0x82fe2da "kernel_config_data",
error_handle=2) at memory.c:1563
#7 0x080e57a8 in read_in_kernel_config (command=0) at kernel.c:5113
#8 0x080825ce in main (argc=3, argv=0xafa7ba54) at main.c:383
I made following patch which changes timing to read ikconfig data
after gdb initialize. This is checked by compile and run for xendump
on x86_32 and x86_32pae.
diff -u crash-4.0-3.1/kernel.c crash-4.0-3.1.patched/kernel.c
--- crash-4.0-3.1/kernel.c 2006-08-05 00:24:00.000000000 +0900
+++ crash-4.0-3.1.patched/kernel.c 2006-08-18 20:07:52.000000000 +0900
@@ -152,6 +152,7 @@
break;
case POST_GDB:
+ read_in_kernel_config(IKCFG_INIT);
if (symbol_exists("__per_cpu_offset")) {
i = get_array_length("__per_cpu_offset", NULL, 0);
get_symbol_data("__per_cpu_offset",
diff -u crash-4.0-3.1/main.c crash-4.0-3.1.patched/main.c
--- crash-4.0-3.1/main.c 2006-08-05 00:24:00.000000000 +0900
+++ crash-4.0-3.1.patched/main.c 2006-08-18 20:10:34.000000000 +0900
@@ -380,7 +380,6 @@
machdep_init(PRE_SYMTAB);
symtab_init();
machdep_init(PRE_GDB);
- read_in_kernel_config(IKCFG_INIT);
datatype_init();
/*
--
Kazuo Moriwaka <moriwaka(a)valinux.co.jp>