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Date:   Wed, 16 Dec 2020 15:19:25 +0800
From:   Rong Chen <rong.a.chen@...el.com>
To:     Willy Tarreau <w@....eu>, kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: [kbuild-all] Re: drivers/mtd/tests/subpagetest.c:426:1: error:
 could not split insn



On 12/15/20 11:40 PM, Willy Tarreau wrote:
> Hi,
>
> On Tue, Dec 15, 2020 at 11:05:28PM +0800, kernel test robot wrote:
>> Hi Willy,
>>
>> FYI, the error/warning still remains.
>>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   148842c98a24e508aecb929718818fbf4c2a6ff3
>> commit: 3744741adab6d9195551ce30e65e726c7a408421 random32: add noise from network and scheduling activity
> (...)
>
> not sure why I'm assigned this, but the root cause is a compiler bug:
>>     drivers/mtd/tests/subpagetest.c: In function 'mtd_subpagetest_init':
>>>> drivers/mtd/tests/subpagetest.c:426:1: error: could not split insn
>>       426 | }
>>           | ^
>>     (insn:TI 453 2652 455 (set (reg/v:SI 3 a3 [orig:304 a ] [304])
>>             (xor:SI (reg:SI 1 a1 [orig:717 net_rand_noise ] [717])
>>                 (const:SI (plus:SI (symbol_ref:SI ("*.LANCHOR0") [flags 0x182])
>>                         (const_int 12 [0xc]))))) "include/linux/prandom.h":66:4 152 {cskyv2_xorsi3}
>>          (expr_list:REG_DEAD (reg:SI 1 a1 [orig:717 net_rand_noise ] [717])
>>             (nil)))
>>     during RTL pass: final
>>     drivers/mtd/tests/subpagetest.c:426:1: internal compiler error: in final_scan_insn_1, at final.c:3074
>                                              ^^^^^^^^^^^^^^^^^^^^^^^
>
>>     0x510da0 _fatal_insn(char const*, rtx_def const*, char const*, int, char const*)
>>     	/tmp/build-crosstools-xh-9.3.0-2.34/gcc/gcc-9.3.0/gcc/rtl-error.c:108
>>     0x503d22 final_scan_insn_1
>>     	/tmp/build-crosstools-xh-9.3.0-2.34/gcc/gcc-9.3.0/gcc/final.c:3074
>>     0x73f8bf final_scan_insn(rtx_insn*, _IO_FILE*, int, int, int*)
>>     	/tmp/build-crosstools-xh-9.3.0-2.34/gcc/gcc-9.3.0/gcc/final.c:3153
>>     0x73fbac final_1
>>     	/tmp/build-crosstools-xh-9.3.0-2.34/gcc/gcc-9.3.0/gcc/final.c:2021
>>     0x740618 rest_of_handle_final
>>     	/tmp/build-crosstools-xh-9.3.0-2.34/gcc/gcc-9.3.0/gcc/final.c:4659
>>     0x740618 execute
>>     	/tmp/build-crosstools-xh-9.3.0-2.34/gcc/gcc-9.3.0/gcc/final.c:4737
>>     Please submit a full bug report,
>>     with preprocessed source if appropriate.
>>     Please include the complete backtrace with any bug report.
>>     See <https://gcc.gnu.org/bugs/> for instructions.
>            ^^^^^^^^^^^^^^^^^^^^^^^^^
>
> That's totally out of my scope. I suspect it might have broken a bisect
> operation.

Hi Willy,

Thanks for the feedback, I have created a issue in GCC Bugzilla:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98310

Best Regards,
Rong Chen

>
> Regards,
> Willy
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