linux-kernel - Re: parallel make broken with ORC unwinder

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Message-ID: <20171219164153.foik72qfn2lojuw7@treble>
Date:   Tue, 19 Dec 2017 10:41:54 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Vegard Nossum <vegard.nossum@...il.com>
Cc:     kbuild <linux-kbuild@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: parallel make broken with ORC unwinder

On Tue, Dec 19, 2017 at 04:42:12PM +0100, Vegard Nossum wrote:
> Hi,
> 
> When I run make -j64 on a v4.14 kernel or newer with ORC_UNWINDER=y
> the kernel build breaks like this:
> 
> $ make -j64
>   CHK     include/config/kernel.release
>   CHK     include/generated/uapi/linux/version.h
>   DESCEND  objtool
>   CC      scripts/mod/empty.o
> [...]
> security/smack/smack_lsm.o: warning: objtool: elf_update: cannot write
> data to file
> [...]
> drivers/atm/uPD98402.o: warning: objtool: elf_update: cannot write data to file
>   AR      arch/x86/entry/vdso/built-in.o
>   CC      security/keys/permission.o
>   CC      arch/x86/entry/vsyscall/vsyscall_gtod.o
>   CC      security/keys/process_keys.o
>   CC [M]  arch/x86/kvm/../../../virt/kvm/irqchip.o
> Segmentation fault
> make[2]: *** [drivers/atm/uPD98402.o] Error 139
> make[2]: *** Waiting for unfinished jobs....

Hi Vegard,

Thanks for reporting this.  Can you clarify why rewriting the file in
place seems buggy?

-- 
Josh