From: Yonghong Song <yhs@fb.com>
To: Andrei Matei <andreimatei1@gmail.com>, bpf <bpf@vger.kernel.org>,
Alexei Starovoitov <ast@kernel.org>
Subject: Re: clang crash for target BPF
Date: Sun, 28 Feb 2021 20:27:15 -0800 [thread overview]
Message-ID: <cc9defee-dcd8-5b06-7396-213599651752@fb.com> (raw)
In-Reply-To: <747ea282-d158-f65f-65ac-c13dac694974@gmail.com>
On 2/28/21 2:14 PM, Andrei Matei wrote:
> Hello,
>
> I've encountered an assertion failure / crash on clang master
> (5de09ef02e24) as well as the older version 11. Happens for "-target
> bpf", not otherwise.
> I've reported it to clang but there's been no response so far. Alexei, I
> believe you've invited me to raise the issue here.
> clang bugzilla:
> https://bugs.llvm.org/show_bug.cgi?id=48578
>
>
> The repro program and instructions are in the bug report above.
> The assertion failure reads:
>
> clang:
> /home/andrei/src/llvm-project/llvm/lib/CodeGen/LiveVariables.cpp:130:
> void llvm::LiveVariables::HandleVirtRegUse(llvm::Register,
> llvm::MachineBasicBlock*, llvm::MachineInstr&): Assertion
> `MRI->getVRegDef(Reg) && "Register use before def!"' failed.
> PLEASE submit a bug report to
> https://bugs.llvm.org/
> and include the crash backtrace, preprocessed source, and associated run
> script.
> Stack dump:
> 0. Program arguments: bin/clang -O2 -target bpf -c -o probe.bpf.o
> /home/andrei/Downloads/probe.bpf.preprocessed.c
> 1. <eof> parser at end of file
> 2. Code generation
> 3. Running pass 'Function Pass Manager' on module
> '/home/andrei/Downloads/probe.bpf.preprocessed.c'.
> 4. Running pass 'Live Variable Analysis' on function '@probe'
Andrei, Thanks for reporting. I can reproduce with latest llvm trunk.
Will take a look and comment in the above bugzilla report whenever
I find anything. Thanks again!
>
>
> Thanks!
>
prev parent reply other threads:[~2021-03-01 4:28 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CABWLset0aqju=tkCVQJ3p8QyVwFUi21HkfxBS3rK7qC5oScyWw@mail.gmail.com>
2021-02-28 22:14 ` clang crash for target BPF Andrei Matei
2021-03-01 4:27 ` Yonghong Song [this message]
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