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From: Ingo Molnar <mingo@kernel.org>
To: Dave Hansen <dave.hansen@linux.intel.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linuxram@us.ibm.com, tglx@linutronix.de, dave.hansen@intel.com,
	mpe@ellerman.id.au, akpm@linux-foundation.org, shuah@kernel.org,
	shakeelb@google.com
Subject: Re: [PATCH 0/9] [v3] x86, pkeys: two protection keys bug fixes
Date: Sat, 28 Apr 2018 09:15:38 +0200	[thread overview]
Message-ID: <20180428071538.3whanph7r6v56h2a@gmail.com> (raw)
In-Reply-To: <20180428070553.yjlt22sb6ntcaqnc@gmail.com>


* Ingo Molnar <mingo@kernel.org> wrote:

> After I got the GDB backtraces I tried to clean up leftover tasks, but the main 
> thread would not go away:
> 
>  4006 pts/0    00:00:00 protection_keys <defunct>
> 
> neither SIGCONT nor SIGKILL appears to help:

Just seconds after I sent this I found out that this was user error: I forgot 
about a gdb session I still had running, which understandably blocked the task 
from being cleaned up. Once I exited GDB it all got cleaned up properly.

The hang problem is still there, if I run a script like this:

 while :; do date; echo -n "32-bit: "; ./protection_keys_32 >/dev/null; date; echo -n "64-bit: "; ./protection_keys_64 >/dev/null; done

then within a minute one of the testcases hangs reliably.

Out of 4 attempts so far one hang was in the 32-bit testcase, 3 hangs were in the 
64-bit testcase - so 64-bit appears to trigger it more frequently.

Thanks,

	Ingo

  reply	other threads:[~2018-04-28  7:15 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-27 17:45 Dave Hansen
2018-04-27 17:45 ` [PATCH 1/9] x86, pkeys: do not special case protection key 0 Dave Hansen
2018-04-27 17:45 ` [PATCH 2/9] x86, pkeys, selftests: save off 'prot' for allocations Dave Hansen
2018-04-27 17:45 ` [PATCH 3/9] x86, pkeys, selftests: add a test for pkey 0 Dave Hansen
2018-04-27 17:45 ` [PATCH 4/9] x86, pkeys: override pkey when moving away from PROT_EXEC Dave Hansen
2018-04-27 17:45 ` [PATCH 5/9] x86, pkeys, selftests: fix pointer math Dave Hansen
2018-04-27 17:45 ` [PATCH 6/9] x86, pkeys, selftests: fix pkey exhaustion test off-by-one Dave Hansen
2018-04-27 17:45 ` [PATCH 7/9] x86, pkeys, selftests: factor out "instruction page" Dave Hansen
2018-04-27 17:45 ` [PATCH 8/9] x86, pkeys, selftests: add allow faults on unknown keys Dave Hansen
2018-04-27 17:45 ` [PATCH 9/9] x86, pkeys, selftests: add PROT_EXEC test Dave Hansen
2018-04-28  7:05 ` [PATCH 0/9] [v3] x86, pkeys: two protection keys bug fixes Ingo Molnar
2018-04-28  7:15   ` Ingo Molnar [this message]
2018-04-28  8:29     ` Ingo Molnar
2018-04-30 15:30   ` Dave Hansen
2018-04-30 16:28     ` Ram Pai
2018-05-08 22:49   ` Dave Hansen

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