linux-kernel - Re: [PATCH] powerpc/smp: Wait until secondaries are active & online

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <m3sidtek35.fsf@oc8180480414.ibm.com>
Date:	Thu, 26 Feb 2015 08:51:10 +1100
From:	Stewart Smith <stewart@...ux.vnet.ibm.com>
To:	Michael Ellerman <mpe@...erman.id.au>, linuxppc-dev@...abs.org
Cc:	mingo@...nel.org, tglx@...utronix.de,
	Anton Blanchard <anton@...ba.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/smp: Wait until secondaries are active & online

Michael Ellerman <mpe@...erman.id.au> writes:
> Anton has a busy ppc64le KVM box where guests sometimes hit the infamous
> "kernel BUG at kernel/smpboot.c:134!" issue during boot:
>
>   BUG_ON(td->cpu != smp_processor_id());
>
> Basically a per CPU hotplug thread scheduled on the wrong CPU. The oops
> output confirms it:
>
>   CPU: 0
>   Comm: watchdog/130

Has anyone seen this on powernv before?

I seem to be able to very reliably get such crashes with my
(experimental) gcov enabled skiboot on P7 (and P8, but I've had more
time on P7 than P8).

Hoping to try the patch later today.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/