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From: MaoXiaoyun <tinnycloud@hotmail.com>
To: giamteckchoon@gmail.com
Cc: jeremy@goop.org, xen devel <xen-devel@lists.xensource.com>,
	konrad.wilk@oracle.com
Subject: RE: Kernel BUG at arch/x86/mm/tlb.c:61
Date: Fri, 15 Apr 2011 20:23:55 +0800	[thread overview]
Message-ID: <BLU157-w42DAD248C94153635E9749DAAC0@phx.gbl> (raw)
In-Reply-To: <BLU157-w383D1A2536480BCD4C0E0EDAAD0@phx.gbl>


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Hi：

Could the crash  related to this patch ? 
http://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git;a=commitdiff;h=45bfd7bfc6cf32f8e60bb91b32349f0b5090eea3

Since now TLB state  change to TLBSTATE_OK(mmu_context.h:40) is before cpumask_clear_cpu(line 49).
Could it possible that right after execute line 40 of mmu_context.h,  CPU revice IPI from other CPU to 
flush the mm, and when in interrupt, find the TLB state happened to be TLBSTATE_OK. Which conflicts.

Thanks.

arch/x86/include/asm/mmu_context.h
 
33 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 34 <+++<+++<+++     struct task_struct *tsk)
 35 {
 36 <+++unsigned cpu = smp_processor_id();
 37 
 38 <+++if (likely(prev != next)) {
 39 #ifdef CONFIG_SMP
 40 <+++<+++percpu_write(cpu_tlbstate.state, TLBSTATE_OK);
 41 <+++<+++percpu_write(cpu_tlbstate.active_mm, next);
 42 #endif
 43 <+++<+++cpumask_set_cpu(cpu, mm_cpumask(next));
 44 
 45 <+++<+++/* Re-load page tables */
 46 <+++<+++load_cr3(next->pgd);
 47 
 48 <+++<+++/* stop flush ipis for the previous mm */
 49 <+++<+++cpumask_clear_cpu(cpu, mm_cpumask(prev));  

 		 	   		  

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  reply	other threads:[~2011-04-15 12:23 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <COL0-MC1-F14hmBzxHs00230882@col0-mc1-f14.Col0.hotmail.com>
2011-04-08 11:24 ` kernel BUG at arch/x86/xen/mmu.c:1860! MaoXiaoyun
2011-04-08 11:46   ` MaoXiaoyun
2011-04-10  3:57   ` kernel BUG at arch/x86/xen/mmu.c:1872 MaoXiaoyun
2011-04-10  4:29   ` MaoXiaoyun
2011-04-10 13:57     ` MaoXiaoyun
2011-04-10 20:14       ` Teck Choon Giam
2011-04-11 12:16         ` Teck Choon Giam
2011-04-11 12:22           ` Teck Choon Giam
2011-04-11 12:31           ` MaoXiaoyun
2011-04-11 15:25             ` Teck Choon Giam
2011-04-12  3:30               ` MaoXiaoyun
2011-04-12 16:08                 ` Teck Choon Giam
2011-04-11 18:08             ` Jeremy Fitzhardinge
2011-04-12  3:35               ` MaoXiaoyun
2011-04-12  6:48                 ` Grant Table Error on 2.6.32.36 + Xen 4.0.1 MaoXiaoyun
2011-04-12  8:46                   ` Konrad Rzeszutek Wilk
2011-04-12  9:02                     ` MaoXiaoyun
2011-04-12  9:11                 ` Kernel BUG at arch/x86/mm/tlb.c:61 MaoXiaoyun
2011-04-12 10:00                   ` Konrad Rzeszutek Wilk
2011-04-12 10:10                     ` MaoXiaoyun
2011-04-14  6:16                     ` MaoXiaoyun
2011-04-14  7:26                       ` Teck Choon Giam
2011-04-14  7:56                         ` MaoXiaoyun
2011-04-14 11:16                           ` MaoXiaoyun
2011-04-15 12:23                             ` MaoXiaoyun [this message]
2011-04-15 21:22                               ` Jeremy Fitzhardinge
2011-04-18 15:20                                 ` MaoXiaoyun
2011-04-25  3:15                                 ` MaoXiaoyun
2011-04-26  5:52                                   ` Tian, Kevin
2011-04-26  7:04                                     ` MaoXiaoyun
2011-04-26  8:31                                       ` Tian, Kevin
2011-04-28 23:29                                     ` Jeremy Fitzhardinge
2011-04-29  0:19                                       ` Tian, Kevin
2011-04-29  1:50                                         ` MaoXiaoyun
2011-04-29  1:57                                           ` Tian, Kevin
2011-04-25  4:42                                 ` MaoXiaoyun
2011-04-25 12:54                                   ` MaoXiaoyun
2011-04-25 13:11                                     ` MaoXiaoyun
2011-04-25 15:05                                       ` MaoXiaoyun
2011-04-26  5:55                                         ` Tian, Kevin
2011-04-12 16:32               ` kernel BUG at arch/x86/xen/mmu.c:1872 Teck Choon Giam

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