Internal crash when inserting instruction

[Ray Guo]

Hi,

I am trying to insert an add instruction to increment a global counter by the following code. I use Linux system with Aarch64 architecture. 

/* save arithmetic flags */ 

dr_save_reg(drcontext, bb, first_inst, DR_REG_X0, SPILL_SLOT_1); dr_save_arith_flags_to_reg(drcontext, bb, first_inst, DR_REG_X0); 

/* inser inst to increment the counter */ 

uint64_t tmp = 0; int one = 1; 

instrlist_meta_preinsert(bb, 

                         first_inst, 

                         XINST_CREATE_add(drcontext, OPND_CREATE_ABSMEM((void*)&global_counter, OPSZ_8), OPND_CREATE_INT(1))  

); 

/* restore arithmetic flags */ 

dr_restore_arith_flags_from_reg(drcontext, bb, first_inst, DR_REG_X0);

dr_restore_reg(drcontext, bb, first_inst, DR_REG_X0, SPILL_SLOT_1);

But the client crashes with the following information: 

Tool internal crash at PC 0x000000007109cd7c.  Please report this at your tool's issue tracker.  Program aborted.
Received SIGSEGV at pc 0x000000007109cd7c in thread 2920934
Base: 0x0000000071000000
Registers:      eflags=0x0000000080001000
version 9.0.1, custom build

Do you have any ideas about how to solve this issue?

Thanks a lot for your help. 

Sincerely,

Ray

[Sahil Gupta]

Hello,

In order to assist you better, would you be able to run this with a debug build and provide us with:

• The crash callstack
• The exact crashing block ASM code
• Register values at that point 

These can be obtained using GDB. Our debug page has some information on how to do this: https://dynamorio.org/page_debugging.html