Re: [Qemu-devel] tcg/tcg.c:1892: tcg fatal error

[Aurelien Jarno <aurelien@aurel32.net>]

On Sun, Apr 10, 2011 at 02:29:59PM +0200, Artyom Tarasenko wrote:
> Trying to boot some proprietary OS I get qemu-system-sparc64 crash with a
> 
> tcg/tcg.c:1892: tcg fatal error
> 
> error message.
> 
> It looks like it can be a platform independent bug though, because
> when a '-singlestep' option IS present, qemu doesn't crash and seems
> to translate the code properly.
> 
> (gdb) bt
> #0  0x00000032c2e327f5 in raise () from /lib64/libc.so.6
> #1  0x00000032c2e33fd5 in abort () from /lib64/libc.so.6
> #2  0x000000000051933d in tcg_reg_alloc_call (s=<value optimized out>,
> def=0x89d340, opc=INDEX_op_call, args=0x10acc98, dead_iargs=3) at
> qemu/tcg/tcg.c:1892
> #3  0x000000000051a557 in tcg_gen_code_common (s=0x10b8940,
> gen_code_buf=0x40338b60 "I\213n@H\213] 3\355I\211\256\220") at
> qemu/tcg/tcg.c:2099
> #4  tcg_gen_code (s=0x10b8940, gen_code_buf=0x40338b60 "I\213n@H\213]
> 3\355I\211\256\220") at qemu/tcg/tcg.c:2142
> #5  0x00000000004d38f1 in cpu_sparc_gen_code (env=0x10cce10,
> tb=0x7fffe91bc218, gen_code_size_ptr=0x7fffffffd9b4) at
> qemu/translate-all.c:93
> #6  0x00000000004d1fd7 in tb_gen_code (env=0x10cce10, pc=18868776,
> cs_base=18868780, flags=15, cflags=0) at qemu/exec.c:989
> #7  0x00000000004d4029 in tb_find_slow (env1=<value optimized out>) at
> qemu/cpu-exec.c:167
> #8  tb_find_fast (env1=<value optimized out>) at cpu-exec.c:194
> #9  cpu_sparc_exec (env1=<value optimized out>) at qemu/cpu-exec.c:556
> #10 0x0000000000408868 in tcg_cpu_exec () at qemu/cpus.c:1066
> #11 cpu_exec_all () at qemu/cpus.c:1102
> #12 0x000000000053c756 in main_loop (argc=<value optimized out>,
> argv=<value optimized out>, envp=<value optimized out>) at
> qemu/vl.c:1430
> 
> I inspected ts->val_type causing the abort() case and it turned out to be 0.
> 
> The last lines of qemu.log (without -singlestep)
> IN:
> 0x00000000011fe9f0:  rdpr  %pstate, %g1
> 0x00000000011fe9f4:  wrpr  %g1, 2, %pstate
> --------------
> IN:
> 0x00000000011fe9f8:  ldub  [ %o0 ], %o1
> 0x00000000011fe9fc:  mov  %o1, %o2
> 0x00000000011fea00:  rdpr  %tick, %o3
> 0x00000000011fea04:  cmp  %o1, %o2
> 0x00000000011fea08:  be  %icc, 0x11fea00
> 0x00000000011fea0c:  ldub  [ %o0 ], %o2
> 
> Search PC...
> Search PC...
> Search PC...
> Search PC...
> Search PC...
> Search PC...
> --------------
> IN:
> 0x00000000011fe9f8:  ldub  [ %o0 ], %o1
> 0x00000000011fe9fc:  mov  %o1, %o2
> 0x00000000011fea00:  rdpr  %tick, %o3
> 0x00000000011fea04:  cmp  %o1, %o2
> 0x00000000011fea08:  be  %icc, 0x11fea00
> 0x00000000011fea0c:  ldub  [ %o0 ], %o2
> 
> 110521: Data Access MMU Miss (v=0068) pc=00000000011fe9f8
> npc=00000000011fe9fc SP=000000000180ae41
> pc: 00000000011fe9f8  npc: 00000000011fe9fc
> 
> IN:
> 0x00000000011fea00:  rdpr  %tick, %o3
> 0x00000000011fea04:  cmp  %o1, %o2
> 0x00000000011fea08:  be  %icc, 0x11fea00
> 0x00000000011fea0c:  ldub  [ %o0 ], %o2
> --------------
> IN:
> 0x00000000011fea10:  brz,pn   %o2, 0x11fe9f8
> 0x00000000011fea14:  mov  %o2, %o4
> --------------
> IN:
> 0x00000000011fea18:  rdpr  %tick, %o5
> 0x00000000011fea1c:  cmp  %o2, %o4
> 0x00000000011fea20:  be  %icc, 0x11fea18
> 0x00000000011fea24:  ldub  [ %o0 ], %o4
> --------------
> IN:
> 0x00000000011fea28:  brz,pn   %o4, 0x11fe9f4
> 0x00000000011fea2c:  wrpr  %g0, %g1, %pstate
> <EOF>
> 
> The crash is 100% reproducible and happens always on the same place,
> so it's probably a pure TCG issue, not related on getting the
> external/timer interrupts.
> 
> Do you need any additional info?
> 

What would be interesting would be to get the corresponding TCG code
from qemu.log (-d op,op_opt).

-- 
Aurelien Jarno                          GPG: 1024D/F1BCDB73
aurelien@aurel32.net                 http://www.aurel32.net