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From: cbouatmailru@gmail.com (Anton Vorontsov)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH RFC 0/4] ARM/KGDB: Some fixes for SMP machines
Date: Wed, 7 Jul 2010 21:12:22 +0400	[thread overview]
Message-ID: <20100707171222.GA16448@oksana.dev.rtsoft.ru> (raw)

Hi all,

It appears that KGDB can easily hang SMP ARM machines.

Here are few fixes that I come up with.

Before the patches, doing 'b schedule' and then 1-3 'continue'
or 'si' gdb commands would cause the board to lock-up completely.

After the patches, KGDB seems to be bullet proof. Well, at least
with the 'b schedule' testcase, there might be other bugs which
I didn't hit yet. ;-)

Notes:

1. I'm testing with I/D caches disabled. With enabled caches,
   ARMv6K still locks-up. I'll test ARMv7 soon, and will try
   to debug cache issues on ARMv6K.

2. The patches are against a heavily patched kernel, and so far
   I didn't rebase them onto the 'debug core' rework as found
   in the very latest mainline kernels. I'll rebase the patches
   soon, so for now this is just an RFC.

Thanks!

-- 
Anton Vorontsov
email: cbouatmailru at gmail.com
irc://irc.freenode.net/bd2

             reply	other threads:[~2010-07-07 17:12 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-07-07 17:12 Anton Vorontsov [this message]
2010-07-07 17:13 ` [PATCH RFC 1/4] ARM: kgdb: Must poll for IPIs during busy-waiting Anton Vorontsov
2010-07-07 17:13 ` [PATCH RFC 2/4] ARM: kgdb: Disable preemption before re-enabling interrupts Anton Vorontsov
2010-07-07 17:13 ` [PATCH RFC 3/4] net: Implement napi_try_disable() Anton Vorontsov
2010-07-07 17:13 ` [PATCH RFC 4/4] kgdb: Quiesce IO back-end before rounding up secondary CPUs Anton Vorontsov
2010-07-07 17:54 ` [PATCH RFC 0/4] ARM/KGDB: Some fixes for SMP machines Anton Vorontsov
2010-07-08  8:48 ` Will Deacon

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