On 01/16/2014 08:39 AM, tip-bot for Peter Zijlstra wrote:
Commit-ID: c026b3591e4f2a4993df773183704bb31634e0bd
Gitweb: http://git.kernel.org/tip/c026b3591e4f2a4993df773183704bb31634e0bd
Author: Peter Zijlstra<peterz@xxxxxxxxxxxxx>
AuthorDate: Fri, 10 Jan 2014 21:06:03 +0100
Committer: Ingo Molnar<mingo@xxxxxxxxxx>
CommitDate: Thu, 16 Jan 2014 09:19:48 +0100
x86, mm, perf: Allow recursive faults from interrupts
Waiman managed to trigger a PMI while in a emulate_vsyscall() fault,
the PMI in turn managed to trigger a fault while obtaining a stack
trace. This triggered the sig_on_uaccess_error recursive fault logic
and killed the process dead.
Fix this by explicitly excluding interrupts from the recursive fault
logic.
Reported-and-Tested-by: Waiman Long<waiman.long@xxxxxx>
Fixes: e00b12e64be9 ("perf/x86: Further optimize copy_from_user_nmi()")
Cc: Aswin Chandramouleeswaran<aswin@xxxxxx>
Cc: Scott J Norton<scott.norton@xxxxxx>
Cc: Linus Torvalds<torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Andy Lutomirski<luto@xxxxxxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo<acme@xxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton<akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra<peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20140110200603.GJ7572@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar<mingo@xxxxxxxxxx>
---
arch/x86/mm/fault.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
Will that be picked up by Linus as it is a 3.13 regression? -Longman -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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