I am analyzing the kdump in latest crash utility 8.0.4++.
I think I loaded the module symbols correctly :
crash> mod
MODULE NAME TEXT_BASE SIZE OBJECT FILE
ffff80007a7e2040 npdereference ffff80007a7e0000 12288 (not loaded)
[CONFIG_KALLSYMS]
crash>
crash> mod -s npdereference
/home/naveen/.repos/src/arm64/linux/drivers/naveen/npdereference.ko
MODULE NAME TEXT_BASE SIZE OBJECT FILE
ffff80007a7e2040 npdereference ffff80007a7e0000 12288
/home/naveen/.repos/src/arm64/linux/drivers/naveen/npdereference.ko
But still my backtrace doesn't say the correct symbol name :
#12 [ffff800082c6ba60] _MODULE_INIT_TEXT_START_npdereference at
ffff80007a7e602c [npdereference]
The module name is "npdereference.ko" and the function where the crash is done
looks like below. So I expect "null_deref_module_init" to be present instead
of "_MODULE_INIT_TEXT_START_npdereference" :
static int __init null_deref_module_init(void) {
// Pointer to an integer, initialized to NULL
int *null_pointer = NULL;
printk(KERN_INFO "Null dereference module loaded\n");
// Dereferencing the NULL pointer to trigger a crash
printk(KERN_INFO "Triggering null pointer dereference...\n");
*null_pointer = 1; // This line will cause a null pointer dereference
return 0; // This will never be reached
}
The "sym" command also doesn't point me to the source file :
crash> sym ffff80007a7e602c
ffff80007a7e602c (m) _MODULE_INIT_TEXT_START_npdereference+44 [npdereference]
crash>
Is there a way to make this work correctly. The kernel module here is called
"npdereference.ko" and is in-tree (part of kernel source repo).
Regards,
Naveen
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