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Re: [Qemu-devel] [PATCH v2] ppc / sparc: Add a tester for checking wheth


From: Artyom Tarasenko
Subject: Re: [Qemu-devel] [PATCH v2] ppc / sparc: Add a tester for checking whether OpenBIOS runs successfully
Date: Fri, 17 Jun 2016 13:36:42 +0200

Hi Mark,

On Fri, Jun 17, 2016 at 1:27 PM, Mark Cave-Ayland
<address@hidden> wrote:
> On 17/06/16 07:07, David Gibson wrote:
>
>> On Wed, Jun 15, 2016 at 01:10:18PM +1000, David Gibson wrote:
>>> On Tue, Jun 14, 2016 at 03:57:56PM +0200, Thomas Huth wrote:
>>>> Since the mac99 and g3beige PowerPC machines recently broke without
>>>> being noticed, it would be good to have a tester for "make check"
>>>> that detects such issues immediately. A simple way to test the firmware
>>>> of these machines is to use the "-prom-env" parameter of QEMU. This
>>>> parameter can be used to put some Forth code into the 'boot-command'
>>>> firmware variable which then can signal success to the tester by
>>>> writing a magic value to a known memory location. And since some of the
>>>> Sparc machines are also using OpenBIOS, they are now tested with this
>>>> prom-env-tester, too.
>>>>
>>>> Reviewed-by: Markus Armbruster <address@hidden>
>>>> Signed-off-by: Thomas Huth <address@hidden>
>>>> ---
>>>>  v2: Removed unnecessary include statements (as suggested by Markus)
>>>
>>> Beautiful, I've applied this to ppc-for-2.7, assuming I don't get an
>>> objection to taking this through my tree.
>>
>> Ugh.. turns out this fails on sparc64 target on a 32-bit x86 host.
>> Specifically it trips the tcg_abort() at the end of tcg_reg_alloc()
>> (tcg/tcg.c).
>>
>> I'm reasonably confident this is a pre-existing bug, just triggered by
>> this test, but in the interests of getting this up and running on the
>> platforms where it is working, I've disabled the testcase on sparc64
>> for now.
>>
>> Mark, if you could debug the sparc64-on-i386 failure at some point,
>> that would be helpful.
>
> I'm a little tied up until next week, however I was able to reproduce on
> a local i386 VM and get a stack trace:
>
>
> $ gdb --args ./qemu-system-sparc64 -nographic
> GNU gdb (Debian 7.10-1.1) 7.10
> Copyright (C) 2015 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later
> <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "i686-linux-gnu".
> Type "show configuration" for configuration details.
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>.
> Find the GDB manual and other documentation resources online at:
> <http://www.gnu.org/software/gdb/documentation/>.
> For help, type "help".
> Type "apropos word" to search for commands related to "word"...
> Reading symbols from ./qemu-system-sparc64...done.
> (gdb) r
> Starting program: /home/build/rel-qemu-git/bin/qemu-system-sparc64
> -nographic
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
> [New Thread 0xb7989b40 (LWP 27497)]
> [New Thread 0xb4af1b40 (LWP 27498)]
> OpenBIOS for Sparc64
> Configuration device id QEMU version 1 machine id 0
> kernel cmdline
> CPUs: 1 x SUNW,UltraSPARC-IIi
> UUID: 00000000-0000-0000-0000-000000000000
> /home/build/src/qemu/tcg/tcg.c:1743: tcg fatal error
>
> Program received signal SIGABRT, Aborted.
> [Switching to Thread 0xb4af1b40 (LWP 27498)]
> 0xb7fdadad in __kernel_vsyscall ()
> (gdb) bt
> #0  0xb7fdadad in __kernel_vsyscall ()
> #1  0xb7a2ee26 in __GI_raise (sig=6) at
> ../sysdeps/unix/sysv/linux/raise.c:55
> #2  0xb7a303f7 in __GI_abort () at abort.c:89
> #3  0x08061776 in tcg_reg_alloc (s=0x8637780 <tcg_ctx>,
> desired_regs=255, allocated_regs=255, rev=true) at
> /home/build/src/qemu/tcg/tcg.c:1743
> #4  0x0806181a in temp_load (s=0x8637780 <tcg_ctx>, ts=0x8637978
> <tcg_ctx+504>, desired_regs=255, allocated_regs=255) at
> /home/build/src/qemu/tcg/tcg.c:1762
> #5  0x080615e0 in tcg_reg_sync (s=0x8637780 <tcg_ctx>, reg=TCG_REG_EAX,
> allocated_regs=255) at /home/build/src/qemu/tcg/tcg.c:1694
> #6  0x08061653 in tcg_reg_free (s=0x8637780 <tcg_ctx>, reg=TCG_REG_EAX,
> allocated_regs=254) at /home/build/src/qemu/tcg/tcg.c:1709
> #7  0x08061740 in tcg_reg_alloc (s=0x8637780 <tcg_ctx>,
> desired_regs=255, allocated_regs=254, rev=true) at
> /home/build/src/qemu/tcg/tcg.c:1738
> #8  0x0806181a in temp_load (s=0x8637780 <tcg_ctx>, ts=0x8637978
> <tcg_ctx+504>, desired_regs=255, allocated_regs=254) at
> /home/build/src/qemu/tcg/tcg.c:1762
> #9  0x080615e0 in tcg_reg_sync (s=0x8637780 <tcg_ctx>, reg=TCG_REG_ECX,
> allocated_regs=254) at /home/build/src/qemu/tcg/tcg.c:1694
> #10 0x08061653 in tcg_reg_free (s=0x8637780 <tcg_ctx>, reg=TCG_REG_ECX,
> allocated_regs=252) at /home/build/src/qemu/tcg/tcg.c:1709
> #11 0x08061740 in tcg_reg_alloc (s=0x8637780 <tcg_ctx>,
> desired_regs=255, allocated_regs=252, rev=true) at
> /home/build/src/qemu/tcg/tcg.c:1738
> #12 0x0806181a in temp_load (s=0x8637780 <tcg_ctx>, ts=0x8637978
> <tcg_ctx+504>, desired_regs=255, allocated_regs=252) at
> /home/build/src/qemu/tcg/tcg.c:1762
> #13 0x08061858 in temp_load (s=0x8637780 <tcg_ctx>, ts=0x8637f48
> <tcg_ctx+1992>, desired_regs=255, allocated_regs=252) at
> /home/build/src/qemu/tcg/tcg.c:1765
> #14 0x0806220f in tcg_reg_alloc_op (s=0x8637780 <tcg_ctx>, def=0x859c150
> <tcg_op_defs+720>, opc=INDEX_op_sub2_i32, args=0x863be54
> <tcg_ctx+18132>, dead_args=60, sync_args=0 '\000') at
> /home/build/src/qemu/tcg/tcg.c:2050
> #15 0x08063156 in tcg_gen_code (s=0x8637780 <tcg_ctx>, tb=0xb4b14d90) at
> /home/build/src/qemu/tcg/tcg.c:2454
> #16 0x08058cb4 in tb_gen_code (cpu=0x8a9e370, pc=4291901680,
> cs_base=4291901684, flags=7, cflags=0) at
> /home/build/src/qemu/translate-all.c:1212
> #17 0x0805a8c5 in tb_find_slow (cpu=0x8a9e370, pc=4291901680,
> cs_base=4291901684, flags=7) at /home/build/src/qemu/cpu-exec.c:310
> #18 0x0805aa1e in tb_find_fast (cpu=0x8a9e370, last_tb=0xb4af1044,
> tb_exit=1) at /home/build/src/qemu/cpu-exec.c:339
> #19 0x0805b189 in cpu_sparc_exec (cpu=0x8a9e370) at
> /home/build/src/qemu/cpu-exec.c:625
> #20 0x0808666d in tcg_cpu_exec (cpu=0x8a9e370) at
> /home/build/src/qemu/cpus.c:1541
> #21 0x0808675b in tcg_exec_all () at /home/build/src/qemu/cpus.c:1574
> #22 0x08085c29 in qemu_tcg_cpu_thread_fn (arg=0x8a9e370) at
> /home/build/src/qemu/cpus.c:1171
> #23 0xb7bc12de in start_thread (arg=0xb4af1b40) at pthread_create.c:334
> #24 0xb7aeb23e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:122
> (gdb)
>
>
> I've added Richard as CC since it looks like this is something in the
> TCG core.

While you are at it, can you please check, whether  -singlestep option
chanes anything at all?
It may help to see if the bug has to do with the TCG optimizer.

Artyom


-- 
Regards,
Artyom Tarasenko

SPARC and PPC PReP under qemu blog: http://tyom.blogspot.com/search/label/qemu



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