linux-kernel - [mm] BUG: Int 6: CR2 (null)

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Message-ID: <20141009020410.GA7968@wfg-t540p.sh.intel.com>
Date:	Thu, 9 Oct 2014 10:04:10 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [mm] BUG: Int 6: CR2   (null)

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

Elapsed time: 5
qemu-system-i386 -enable-kvm -kernel /kernel/i386-randconfig-hxb2-1008/099669ed953121e1b00248f65326b6b092fa47c8/vmlinuz-3.17.0-next-20141008 -append 'user=lkp job=/lkp/scheduled/vm-kbuild-yocto-i386-58/rand_boot-1-yocto-minimal-i386.cgz-i386-randconfig-hxb2-1008-099669ed953121e1b00248f65326b6b092fa47c8-0.yaml ARCH=i386 BOOT_IMAGE=/kernel/i386-randconfig-hxb2-1008/099669ed953121e1b00248f65326b6b092fa47c8/vmlinuz-3.17.0-next-20141008 kconfig=i386-randconfig-hxb2-1008 commit=099669ed953121e1b00248f65326b6b092fa47c8 branch=next/master root=/dev/ram0 max_uptime=3600 RESULT_ROOT=/result/vm-kbuild-yocto-i386/boot/1/yocto-minimal-i386.cgz/i386-randconfig-hxb2-1008/099669ed953121e1b00248f65326b6b092fa47c8/0 ip=::::vm-kbuild-yocto-i386-58::dhcp earlyprintk=ttyS0,115200 debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal rw drbd.minor_count=8'  -initrd /fs/sdf1/initrd-vm-kbuild-yocto-i386-58 -m 320 -smp 2 -net nic,vlan=1,model=e1000 -net user,vlan=1 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -drive file=/fs/sdf1/disk0-vm-kbuild-yocto-i386-58,media=disk,if=virtio -drive file=/fs/sdf1/disk1-vm-kbuild-yocto-i386-58,media=disk,if=virtio -drive file=/fs/sdf1/disk2-vm-kbuild-yocto-i386-58,media=disk,if=virtio -drive file=/fs/sdf1/disk3-vm-kbuild-yocto-i386-58,media=disk,if=virtio -drive file=/fs/sdf1/disk4-vm-kbuild-yocto-i386-58,media=disk,if=virtio -drive file=/fs/sdf1/disk5-vm-kbuild-yocto-i386-58,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-kbuild-yocto-i386-58 -serial file:/dev/shm/kboot/serial-vm-kbuild-yocto-i386-58 -daemonize -display none -monitor null 



Thanks,
Fengguang

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