Re: [Qemu-ppc] qemu-ppc crashing on x86

[Cedric Le Goater]

On 02/03/2014 11:48 PM, Alexander Graf wrote:
> 
> On 03.02.2014, at 23:31, Cedric Le Goater <address@hidden> wrote:
> 
>> Hi,
>>
>> The "latest" qemu-ppc is crashing when running a ppc guest on x86. I was 
>> using a 
>> relatively old version until recently, when Tom Musta's patches were merged 
>> a few 
>> days ago. 
>>
>> Anyhow, here are some info on the crash. 
>>
>> qemu-system-ppc64: /home/legoater/work/linux/qemu-agraf.git/tcg/tcg.c:515: 
>> tcg_temp_new_internal: Assertion `ts->base_type == type' failed.
>> Aborted (core dumped)
>>
>> and the core stack trace :
>>
>> #0  0xb7173424 in __kernel_vsyscall ()
>> #1  0xb6d73941 in raise () from /lib/i386-linux-gnu/i686/cmov/libc.so.6
>> #2  0xb6d76d72 in abort () from /lib/i386-linux-gnu/i686/cmov/libc.so.6
>> #3  0xb6d6cb58 in __assert_fail () from 
>> /lib/i386-linux-gnu/i686/cmov/libc.so.6
>> #4  0xb75c4a4a in tcg_temp_new_internal (type=TCG_TYPE_I32, temp_local=0)
>>    at /home/legoater/work/linux/qemu-agraf.git/tcg/tcg.c:515
>> #5  0xb75c4c70 in tcg_temp_new_internal_i32 (temp_local=0)
>>    at /home/legoater/work/linux/qemu-agraf.git/tcg/tcg.c:559
>> #6  0xb75beb03 in tcg_temp_new_i32 () at 
>> /home/legoater/work/linux/qemu-agraf.git/tcg/tcg.h:569
>> #7  0xb75c4efb in tcg_const_i32 (val=25) at 
>> /home/legoater/work/linux/qemu-agraf.git/tcg/tcg.c:606
>> #8  0xb75bf0a4 in tcg_gen_shli_i32 (ret=..., arg1=..., arg2=25)
>>    at /home/legoater/work/linux/qemu-agraf.git/tcg/tcg-op.h:612
>> #9  0xb75c5517 in tcg_gen_shifti_i64 (ret=..., arg1=..., c=7, right=1, 
>> arith=0)
>>    at /home/legoater/work/linux/qemu-agraf.git/tcg/tcg.c:790
>> #10 0xb7543d21 in tcg_gen_shri_i64 (ret=..., arg1=..., arg2=7)
>>    at /home/legoater/work/linux/qemu-agraf.git/tcg/tcg-op.h:985
>> #11 0xb755ff4f in gen_rlwinm (ctx=0x9c7c9e3c)
>>    at /home/legoater/work/linux/qemu-agraf.git/target-ppc/translate.c:1636
>> #12 0xb75ba884 in gen_intermediate_code_internal (cpu=0xb964e210, 
>> tb=0x9d5065b4, search_pc=false)
>>    at /home/legoater/work/linux/qemu-agraf.git/target-ppc/translate.c:11001
>> #13 0xb75bac50 in gen_intermediate_code (env=0xb964e2cc, tb=0x9d5065b4)
>>    at /home/legoater/work/linux/qemu-agraf.git/target-ppc/translate.c:11058
>> #14 0xb75caec3 in cpu_ppc_gen_code (env=0xb964e2cc, tb=0x9d5065b4, 
>> gen_code_size_ptr=0x9c7c9f7c)
>>    at /home/legoater/work/linux/qemu-agraf.git/translate-all.c:159
>> #15 0xb75cc28b in tb_gen_code (env=0xb964e2cc, pc=19524, cs_base=0, flags=0, 
>> cflags=0)
>>    at /home/legoater/work/linux/qemu-agraf.git/translate-all.c:967
>> #16 0xb7431fa4 in tb_find_slow (env=0xb964e2cc, pc=19524, cs_base=0, flags=0)
>>    at /home/legoater/work/linux/qemu-agraf.git/cpu-exec.c:163
>> #17 0xb743219d in tb_find_fast (env=0xb964e2cc) at 
>> /home/legoater/work/linux/qemu-agraf.git/cpu-exec.c:190
>> #18 0xb74325cf in cpu_ppc_exec (env=0xb964e2cc) at 
>> /home/legoater/work/linux/qemu-agraf.git/cpu-exec.c:604
>> #19 0xb7435bb8 in tcg_cpu_exec (env=0xb964e2cc) at 
>> /home/legoater/work/linux/qemu-agraf.git/cpus.c:1255
>> #20 0xb7435cfc in tcg_exec_all () at 
>> /home/legoater/work/linux/qemu-agraf.git/cpus.c:1288
>> #21 0xb7435061 in qemu_tcg_cpu_thread_fn (arg=0xb964e210) at 
>> /home/legoater/work/linux/qemu-agraf.git/cpus.c:954
>> #22 0xb6eb1c39 in start_thread () from 
>> /lib/i386-linux-gnu/i686/cmov/libpthread.so.0
>> #23 0xb6e1e78e in clone () from /lib/i386-linux-gnu/i686/cmov/libc.so.6
>> (gdb) up
>> #1  0xb6d73941 in raise () from /lib/i386-linux-gnu/i686/cmov/libc.so.6
>> (gdb) up
>> #2  0xb6d76d72 in abort () from /lib/i386-linux-gnu/i686/cmov/libc.so.6
>> (gdb) up
>> #3  0xb6d6cb58 in __assert_fail () from 
>> /lib/i386-linux-gnu/i686/cmov/libc.so.6
>> (gdb) up
>> #4  0xb75c4a4a in tcg_temp_new_internal (type=TCG_TYPE_I32, temp_local=0)
>>    at /home/legoater/work/linux/qemu-agraf.git/tcg/tcg.c:515
>> 515          assert(ts->base_type == type);
>> (gdb) p type
>> $1 = TCG_TYPE_I32
>> (gdb) p *ts
>> $2 = {base_type = TCG_TYPE_I64, type = TCG_TYPE_I32, val_type = 0, reg = 6, 
>> val = 0, mem_reg = 4, 
>>  mem_offset = 128, fixed_reg = 0, mem_coherent = 0, mem_allocated = 0, 
>> temp_local = 0, temp_allocated = 1, 
>>  name = 0x0}
>>
>>
>> It might be related to commit 0ec9eabc7f6020418e1f3b3273d1dd701f7f87f9
>> (tcg: Use bitmaps for free temporaries). I tried a few possible fixes 
>> but I did not have much success. Any idea ? 
> 
> You're running on a 32bit host (which is a pretty bad idea when running  
> qemu-system-ppc64 
> since it'll split all 64bit registers into two 32bit ones) OS. 

Yes. I need to reinstall. I have a few 32bit legacy applications ... 

> There was a bug with TCG there which I fixed a while ago (TCG: Fix 
> I64-on-32bit-host temporaries).
> 
> I just rebased my tree against current upstream and checked - the fix is 
> definitely in now. So 
> you should be able to get a working system through a more recent checkout. 
> Except for the VGA 
> problem discussed earlier on this list of course.

This is working much better ! 

Thanks Alex.

C.