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Date: Fri, 7 Dec 2018 17:42:32 +0000
From: Catalin Marinas <catalin.marinas@arm.com>
To: Douglas Anderson <dianders@chromium.org>
Subject: Re: [REPOST PATCH v6 0/4] kgdb: Fix kgdb_roundup_cpus()
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Cc: Michal Hocko <mhocko@suse.com>, linux-sh@vger.kernel.org,
 Peter Zijlstra <peterz@infradead.org>, kgdb-bugreport@lists.sourceforge.net,
 Will Deacon <will.deacon@arm.com>, linux-kernel@vger.kernel.org,
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 "H. Peter Anvin" <hpa@zytor.com>, sparclinux@vger.kernel.org,
 Daniel Thompson <daniel.thompson@linaro.org>,
 Yoshinori Sato <ysato@users.sourceforge.jp>, linux-hexagon@vger.kernel.org,
 x86@kernel.org, Russell King <linux@armlinux.org.uk>,
 Ingo Molnar <mingo@redhat.com>, Huang Ying <ying.huang@intel.com>,
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 Mike Rapoport <rppt@linux.vnet.ibm.com>, Borislav Petkov <bp@alien8.de>,
 Thomas Gleixner <tglx@linutronix.de>, linux-arm-kernel@lists.infradead.org,
 Vineet Gupta <vgupta@synopsys.com>, linux-mips@vger.kernel.org,
 Ralf Baechle <ralf@linux-mips.org>, Richard Kuo <rkuo@codeaurora.org>,
 Paul Burton <paul.burton@mips.com>, Jason Wessel <jason.wessel@windriver.com>,
 Andrew Morton <akpm@linux-foundation.org>, linuxppc-dev@lists.ozlabs.org,
 "David S. Miller" <davem@davemloft.net>
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On Tue, Dec 04, 2018 at 07:38:24PM -0800, Douglas Anderson wrote:
> Douglas Anderson (4):
>   kgdb: Remove irq flags from roundup
>   kgdb: Fix kgdb_roundup_cpus() for arches who used smp_call_function()
>   kgdb: Don't round up a CPU that failed rounding up before
>   kdb: Don't back trace on a cpu that didn't round up

FWIW, trying these on arm64 (ThunderX2) with CONFIG_KGDB_TESTS_ON_BOOT=y
on top of 4.20-rc5 doesn't boot. It looks like they leave interrupts
disabled when they shouldn't and it trips over the BUG at
mm/vmalloc.c:1380 (called via do_fork -> copy_process).

Now, I don't think these patches make things worse on arm64 since prior
to them the kgdb boot tests on arm64 were stuck in a loop (RUN
singlestep).

-- 
Catalin