* Re: [mm] BUG: Int 6: CR2 (null) [not found] <20141009020410.GA7968@wfg-t540p.sh.intel.com> @ 2014-10-23 6:03 ` Weijie Yang 2014-10-23 7:46 ` Marek Szyprowski 0 siblings, 1 reply; 2+ messages in thread From: Weijie Yang @ 2014-10-23 6:03 UTC (permalink / raw) To: Fengguang Wu Cc: Marek Szyprowski, Stephen Rothwell, LKML, lkp, mina86, Joonsoo Kim, Linux-MM On Thu, Oct 9, 2014 at 10:04 AM, Fengguang Wu <fengguang.wu@intel.com> wrote: > Hi Marek, > > FYI, we noticed the below changes on > > git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > commit 478e86d7c8c5f41e29abb81b05b459d24bdc71a2 ("mm: cma: adjust address limit to avoid hitting low/high memory boundary") > > > +------------------------------------------+------------+------------+ > | | 81febe58a8 | 478e86d7c8 | > +------------------------------------------+------------+------------+ > | boot_successes | 10 | 0 | > | boot_failures | 5 | 10 | > | kernel_BUG_at_arch/x86/mm/physaddr.c | 5 | | > | invalid_opcode | 5 | | > | EIP_is_at__phys_addr | 5 | | > | Kernel_panic-not_syncing:Fatal_exception | 5 | | > | backtrace:vm_mmap_pgoff | 5 | | > | backtrace:SyS_mmap_pgoff | 5 | | > | BUG:Int_CR2(null) | 0 | 10 | > +------------------------------------------+------------+------------+ > > [ 0.000000] BRK [0x025ee000, 0x025eefff] PGTABLE > [ 0.000000] cma: dma_contiguous_reserve(limit 13ffe000) > [ 0.000000] cma: dma_contiguous_reserve: reserving 31 MiB for global area > [ 0.000000] BUG: Int 6: CR2 (null) > [ 0.000000] EDI c0000000 ESI (null) EBP 41c11ea4 EBX 425cc101 > [ 0.000000] ESP 41c11e98 ES 0000007b DS 0000007b > [ 0.000000] EDX 00000001 ECX (null) EAX 41cd8150 > [ 0.000000] vec 00000006 err (null) EIP 41072227 CS 00000060 flg 00210002 > [ 0.000000] Stack: 425cc150 (null) (null) 41c11ef4 41d4ee4d (null) 13ffe000 41c11ec4 > [ 0.000000] 41c2d900 (null) 13ffe000 (null) 4185793e 0000002e 410c2982 41c11f00 > [ 0.000000] 410c2df5 (null) (null) (null) 425cc150 00013efe (null) 41c11f28 > [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.17.0-next-20141008 #815 > [ 0.000000] 00000000 425cc101 41c11e48 41850786 41c11ea4 41d2b1db 41d95f71 00000006 > [ 0.000000] 00000000 c0000000 00000000 41c11ea4 425cc101 41c11e98 0000007b 0000007b > [ 0.000000] 00000001 00000000 41cd8150 00000006 00000000 41072227 00000060 00210002 > [ 0.000000] Call Trace: > [ 0.000000] [<41850786>] dump_stack+0x16/0x18 > [ 0.000000] [<41d2b1db>] early_idt_handler+0x6b/0x6b > [ 0.000000] [<41072227>] ? __phys_addr+0x2e/0xca > [ 0.000000] [<41d4ee4d>] cma_declare_contiguous+0x3c/0x2d7 > [ 0.000000] [<4185793e>] ? _raw_spin_unlock_irqrestore+0x59/0x91 > [ 0.000000] [<410c2982>] ? wake_up_klogd+0x8/0x33 > [ 0.000000] [<410c2df5>] ? console_unlock+0x448/0x461 > [ 0.000000] [<41d6d359>] dma_contiguous_reserve_area+0x27/0x47 > [ 0.000000] [<41d6d4d1>] dma_contiguous_reserve+0x158/0x163 > [ 0.000000] [<41d33e0f>] setup_arch+0x79b/0xc68 > [ 0.000000] [<4184c0b4>] ? printk+0x1c/0x1e > [ 0.000000] [<41d2b7cf>] start_kernel+0x9c/0x456 > [ 0.000000] [<41d2b2ca>] i386_start_kernel+0x79/0x7d > I notice that code has been merged into mainline kernel without fix, maybe fengguang's mail was missed. I review the code, dma_contiguous_reserve() is called before initmem_init(), so the variable high_memory is not initialized and calculated by __pa(high_memory), in x86 arch high_memory is initialized after dma_contiguous_reserve(), while in arm arch high_memory is initialized before dma_contiguous_reserve(), I think that is the reason which causes the BUG in x86. However, I'm not familiar with system init sequence, so I send this notice mail rather than a patch :-( cc more people > > Thanks, > Fengguang -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a> ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [mm] BUG: Int 6: CR2 (null) 2014-10-23 6:03 ` [mm] BUG: Int 6: CR2 (null) Weijie Yang @ 2014-10-23 7:46 ` Marek Szyprowski 0 siblings, 0 replies; 2+ messages in thread From: Marek Szyprowski @ 2014-10-23 7:46 UTC (permalink / raw) To: Weijie Yang, Fengguang Wu Cc: Stephen Rothwell, LKML, lkp, mina86, Joonsoo Kim, Linux-MM Hello, On 2014-10-23 08:03, Weijie Yang wrote: > On Thu, Oct 9, 2014 at 10:04 AM, Fengguang Wu <fengguang.wu@intel.com> wrote: >> FYI, we noticed the below changes on >> >> git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master >> commit 478e86d7c8c5f41e29abb81b05b459d24bdc71a2 ("mm: cma: adjust address limit to avoid hitting low/high memory boundary") >> >> >> +------------------------------------------+------------+------------+ >> | | 81febe58a8 | 478e86d7c8 | >> +------------------------------------------+------------+------------+ >> | boot_successes | 10 | 0 | >> | boot_failures | 5 | 10 | >> | kernel_BUG_at_arch/x86/mm/physaddr.c | 5 | | >> | invalid_opcode | 5 | | >> | EIP_is_at__phys_addr | 5 | | >> | Kernel_panic-not_syncing:Fatal_exception | 5 | | >> | backtrace:vm_mmap_pgoff | 5 | | >> | backtrace:SyS_mmap_pgoff | 5 | | >> | BUG:Int_CR2(null) | 0 | 10 | >> +------------------------------------------+------------+------------+ >> >> [ 0.000000] BRK [0x025ee000, 0x025eefff] PGTABLE >> [ 0.000000] cma: dma_contiguous_reserve(limit 13ffe000) >> [ 0.000000] cma: dma_contiguous_reserve: reserving 31 MiB for global area >> [ 0.000000] BUG: Int 6: CR2 (null) >> [ 0.000000] EDI c0000000 ESI (null) EBP 41c11ea4 EBX 425cc101 >> [ 0.000000] ESP 41c11e98 ES 0000007b DS 0000007b >> [ 0.000000] EDX 00000001 ECX (null) EAX 41cd8150 >> [ 0.000000] vec 00000006 err (null) EIP 41072227 CS 00000060 flg 00210002 >> [ 0.000000] Stack: 425cc150 (null) (null) 41c11ef4 41d4ee4d (null) 13ffe000 41c11ec4 >> [ 0.000000] 41c2d900 (null) 13ffe000 (null) 4185793e 0000002e 410c2982 41c11f00 >> [ 0.000000] 410c2df5 (null) (null) (null) 425cc150 00013efe (null) 41c11f28 >> [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.17.0-next-20141008 #815 >> [ 0.000000] 00000000 425cc101 41c11e48 41850786 41c11ea4 41d2b1db 41d95f71 00000006 >> [ 0.000000] 00000000 c0000000 00000000 41c11ea4 425cc101 41c11e98 0000007b 0000007b >> [ 0.000000] 00000001 00000000 41cd8150 00000006 00000000 41072227 00000060 00210002 >> [ 0.000000] Call Trace: >> [ 0.000000] [<41850786>] dump_stack+0x16/0x18 >> [ 0.000000] [<41d2b1db>] early_idt_handler+0x6b/0x6b >> [ 0.000000] [<41072227>] ? __phys_addr+0x2e/0xca >> [ 0.000000] [<41d4ee4d>] cma_declare_contiguous+0x3c/0x2d7 >> [ 0.000000] [<4185793e>] ? _raw_spin_unlock_irqrestore+0x59/0x91 >> [ 0.000000] [<410c2982>] ? wake_up_klogd+0x8/0x33 >> [ 0.000000] [<410c2df5>] ? console_unlock+0x448/0x461 >> [ 0.000000] [<41d6d359>] dma_contiguous_reserve_area+0x27/0x47 >> [ 0.000000] [<41d6d4d1>] dma_contiguous_reserve+0x158/0x163 >> [ 0.000000] [<41d33e0f>] setup_arch+0x79b/0xc68 >> [ 0.000000] [<4184c0b4>] ? printk+0x1c/0x1e >> [ 0.000000] [<41d2b7cf>] start_kernel+0x9c/0x456 >> [ 0.000000] [<41d2b2ca>] i386_start_kernel+0x79/0x7d >> > I notice that code has been merged into mainline kernel without fix, > maybe fengguang's mail was missed. > > I review the code, dma_contiguous_reserve() is called before initmem_init(), > so the variable high_memory is not initialized and calculated by > __pa(high_memory), > in x86 arch high_memory is initialized after dma_contiguous_reserve(), while > in arm arch high_memory is initialized before dma_contiguous_reserve(), > I think that is the reason which causes the BUG in x86. > > However, I'm not familiar with system init sequence, so I send this > notice mail rather than a patch :-( Thanks for your analysis. I agree that the simplest way of fixing this issue is to move dma_contiguous_reserve() after initmem_init(). Could you prepare such patch? Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a> ^ permalink raw reply [flat|nested] 2+ messages in thread
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2014-10-23 6:03 ` [mm] BUG: Int 6: CR2 (null) Weijie Yang
2014-10-23 7:46 ` Marek Szyprowski
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