From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752486AbdF3NR2 (ORCPT ); Fri, 30 Jun 2017 09:17:28 -0400 Received: from terminus.zytor.com ([65.50.211.136]:49915 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751951AbdF3NRZ (ORCPT ); Fri, 30 Jun 2017 09:17:25 -0400 Date: Fri, 30 Jun 2017 06:11:22 -0700 From: tip-bot for Andy Lutomirski Message-ID: Cc: luto@kernel.org, dave.hansen@intel.com, riel@redhat.com, linux-kernel@vger.kernel.org, nadav.amit@gmail.com, tglx@linutronix.de, torvalds@linux-foundation.org, alexander.levin@verizon.com, akpm@linux-foundation.org, mingo@kernel.org, arjan@linux.intel.com, bp@alien8.de, mgorman@suse.de, hpa@zytor.com, peterz@infradead.org Reply-To: hpa@zytor.com, mgorman@suse.de, peterz@infradead.org, mingo@kernel.org, arjan@linux.intel.com, bp@alien8.de, nadav.amit@gmail.com, tglx@linutronix.de, torvalds@linux-foundation.org, alexander.levin@verizon.com, akpm@linux-foundation.org, luto@kernel.org, dave.hansen@intel.com, linux-kernel@vger.kernel.org, riel@redhat.com In-Reply-To: <855acf733268d521c9f2e191faee2dcc23a29729.1498751203.git.luto@kernel.org> References: <855acf733268d521c9f2e191faee2dcc23a29729.1498751203.git.luto@kernel.org> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/mm] x86/mm: Don't reenter flush_tlb_func_common() Git-Commit-ID: bc0d5a89fbe3c83ac45438d7ba88309f4713615d X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: bc0d5a89fbe3c83ac45438d7ba88309f4713615d Gitweb: http://git.kernel.org/tip/bc0d5a89fbe3c83ac45438d7ba88309f4713615d Author: Andy Lutomirski AuthorDate: Thu, 29 Jun 2017 08:53:13 -0700 Committer: Ingo Molnar CommitDate: Fri, 30 Jun 2017 10:12:35 +0200 x86/mm: Don't reenter flush_tlb_func_common() It was historically possible to have two concurrent TLB flushes targetting the same CPU: one initiated locally and one initiated remotely. This can now cause an OOPS in leave_mm() at arch/x86/mm/tlb.c:47: if (this_cpu_read(cpu_tlbstate.state) == TLBSTATE_OK) BUG(); with this call trace: flush_tlb_func_local arch/x86/mm/tlb.c:239 [inline] flush_tlb_mm_range+0x26d/0x370 arch/x86/mm/tlb.c:317 Without reentrancy, this OOPS is impossible: leave_mm() is only called if we're not in TLBSTATE_OK, but then we're unexpectedly in TLBSTATE_OK in leave_mm(). This can be caused by flush_tlb_func_remote() happening between the two checks and calling leave_mm(), resulting in two consecutive leave_mm() calls on the same CPU with no intervening switch_mm() calls. We never saw this OOPS before because the old leave_mm() implementation didn't put us back in TLBSTATE_OK, so the assertion didn't fire. Nadav noticed the reentrancy issue in a different context, but neither of us realized that it caused a problem yet. Reported-by: Levin, Alexander (Sasha Levin) Signed-off-by: Andy Lutomirski Reviewed-by: Nadav Amit Reviewed-by: Thomas Gleixner Cc: Andrew Morton Cc: Arjan van de Ven Cc: Borislav Petkov Cc: Dave Hansen Cc: Linus Torvalds Cc: Mel Gorman Cc: Peter Zijlstra Cc: Rik van Riel Cc: linux-mm@kvack.org Fixes: 3d28ebceaffa ("x86/mm: Rework lazy TLB to track the actual loaded mm") Link: http://lkml.kernel.org/r/855acf733268d521c9f2e191faee2dcc23a29729.1498751203.git.luto@kernel.org Signed-off-by: Ingo Molnar --- arch/x86/mm/tlb.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c index b2485d6..1cc4783 100644 --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -192,6 +192,9 @@ void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next, static void flush_tlb_func_common(const struct flush_tlb_info *f, bool local, enum tlb_flush_reason reason) { + /* This code cannot presently handle being reentered. */ + VM_WARN_ON(!irqs_disabled()); + if (this_cpu_read(cpu_tlbstate.state) != TLBSTATE_OK) { leave_mm(smp_processor_id()); return; @@ -297,8 +300,13 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, info.end = TLB_FLUSH_ALL; } - if (mm == this_cpu_read(cpu_tlbstate.loaded_mm)) + if (mm == this_cpu_read(cpu_tlbstate.loaded_mm)) { + VM_WARN_ON(irqs_disabled()); + local_irq_disable(); flush_tlb_func_local(&info, TLB_LOCAL_MM_SHOOTDOWN); + local_irq_enable(); + } + if (cpumask_any_but(mm_cpumask(mm), cpu) < nr_cpu_ids) flush_tlb_others(mm_cpumask(mm), &info); put_cpu(); @@ -354,8 +362,13 @@ void arch_tlbbatch_flush(struct arch_tlbflush_unmap_batch *batch) int cpu = get_cpu(); - if (cpumask_test_cpu(cpu, &batch->cpumask)) + if (cpumask_test_cpu(cpu, &batch->cpumask)) { + VM_WARN_ON(irqs_disabled()); + local_irq_disable(); flush_tlb_func_local(&info, TLB_LOCAL_SHOOTDOWN); + local_irq_enable(); + } + if (cpumask_any_but(&batch->cpumask, cpu) < nr_cpu_ids) flush_tlb_others(&batch->cpumask, &info); cpumask_clear(&batch->cpumask);