Messages in this thread | | | Date | Wed, 8 May 2013 08:45:19 -0700 | From | Tony Lindgren <> | Subject | Re: [GIT PULL] SLAB changes for v3.10 |
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* Christoph Lameter <cl@linux.com> [130508 07:01]: > On Tue, 7 May 2013, Tony Lindgren wrote: > > > OK got it narrowed down to CONFIG_DEBUG_SPINLOCK=y causing the problem > > with commit 8a965b3b. Ain't nothing like bisecting and booting and then > > diffing .config files on top of that. > > > > > Without reverting 8a965b3b I'm getting: > > The patch (commit 8a965b3baa89ffedc73c0fbc750006c631012ced) merely changed the sequence of > slab creation to address an issue in SLAB. > > Hmmm.. But if KMALLOC_SHIFT_LOW is higher than 6 or 7 then the creation of > the non-power of two slab could be skipped as a result of the patch. But > we should not need them in those cases. > > Can I see the kernel config?
Attached are minimal defconfig-bad and defconfig-good with pretty much everything disabled. These boot vexpress in qemu using earlyprintk for the output.
> What is the value of KMALLOC_SHIFT_LOW?
It's 6.
> Can you figure out which kernel slab the function is trying to access?
I can certainly debug it further, but it's also pretty easy to reproduce:
1. Download and build qemu-linaro from:
https://git.linaro.org/gitweb?p=qemu/qemu-linaro.git
The last time I tried the stock qemu I could not get vexpress to boot with it, don't know if that's still the case. But the above works for me.
2. Cross compile kernel with the attached defconfig-bad
$ ARCH=arm CROSS_COMPILE=... make zImage
3. Try to boot the kernel in qemu
$ qemu-system-arm -machine vexpress-a9 -m 1024 -curses -net nic \ -net user -serial stdio -append "console=ttyAMA0,115200n8 \ root=/dev/mmcblk0p2 ro rootwait physmap.enabled=0 \ debug earlyprintk" -kernel zImage
Regards,
Tony CONFIG_SYSVIPC=y CONFIG_NO_HZ=y CONFIG_HIGH_RES_TIMERS=y CONFIG_BSD_PROCESS_ACCT=y CONFIG_IKCONFIG=y CONFIG_IKCONFIG_PROC=y CONFIG_LOG_BUF_SHIFT=16 CONFIG_BLK_DEV_INITRD=y CONFIG_EXPERT=y CONFIG_SLAB=y CONFIG_PROFILING=y CONFIG_OPROFILE=y # CONFIG_BLOCK is not set CONFIG_ARCH_VEXPRESS_CA9X4=y CONFIG_ARM_THUMBEE=y CONFIG_SMP=y CONFIG_NR_CPUS=2 CONFIG_ZBOOT_ROM_TEXT=0x0 CONFIG_ZBOOT_ROM_BSS=0x0 CONFIG_CMDLINE="root=/dev/mmcblk0p2 rootwait console=ttyO2,115200" CONFIG_KEXEC=y CONFIG_FPE_NWFPE=y CONFIG_BINFMT_MISC=y CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug" CONFIG_DEVTMPFS=y CONFIG_DEVTMPFS_MOUNT=y CONFIG_CMA=y CONFIG_INPUT_JOYDEV=y CONFIG_INPUT_EVDEV=y CONFIG_KEYBOARD_GPIO=y CONFIG_KEYBOARD_MATRIX=y CONFIG_INPUT_TOUCHSCREEN=y CONFIG_INPUT_MISC=y CONFIG_VT_HW_CONSOLE_BINDING=y # CONFIG_LEGACY_PTYS is not set CONFIG_SERIAL_8250=y CONFIG_SERIAL_8250_CONSOLE=y CONFIG_SERIAL_8250_NR_UARTS=32 CONFIG_SERIAL_8250_EXTENDED=y CONFIG_SERIAL_8250_MANY_PORTS=y CONFIG_SERIAL_8250_SHARE_IRQ=y CONFIG_SERIAL_8250_DETECT_IRQ=y CONFIG_SERIAL_8250_RSA=y CONFIG_SERIAL_AMBA_PL011=y CONFIG_SERIAL_AMBA_PL011_CONSOLE=y CONFIG_DEBUG_GPIO=y CONFIG_GPIO_SYSFS=y # CONFIG_HWMON is not set CONFIG_FB=y CONFIG_FIRMWARE_EDID=y CONFIG_FB_MODE_HELPERS=y CONFIG_FB_TILEBLITTING=y CONFIG_BACKLIGHT_LCD_SUPPORT=y CONFIG_LCD_PLATFORM=y CONFIG_FRAMEBUFFER_CONSOLE=y CONFIG_FRAMEBUFFER_CONSOLE_ROTATION=y CONFIG_FONTS=y CONFIG_FONT_8x8=y CONFIG_FONT_8x16=y CONFIG_LOGO=y # CONFIG_USB_SUPPORT is not set # CONFIG_IOMMU_SUPPORT is not set # CONFIG_FILE_LOCKING is not set # CONFIG_DNOTIFY is not set # CONFIG_INOTIFY_USER is not set CONFIG_TMPFS=y # CONFIG_MISC_FILESYSTEMS is not set CONFIG_PRINTK_TIME=y CONFIG_MAGIC_SYSRQ=y CONFIG_SCHEDSTATS=y CONFIG_TIMER_STATS=y CONFIG_PROVE_LOCKING=y # CONFIG_DEBUG_BUGVERBOSE is not set CONFIG_DEBUG_INFO=y # CONFIG_FTRACE is not set CONFIG_DEBUG_LL=y CONFIG_DEBUG_VEXPRESS_UART0_CA9=y CONFIG_EARLY_PRINTK=y CONFIG_SYSVIPC=y CONFIG_NO_HZ=y CONFIG_HIGH_RES_TIMERS=y CONFIG_BSD_PROCESS_ACCT=y CONFIG_IKCONFIG=y CONFIG_IKCONFIG_PROC=y CONFIG_LOG_BUF_SHIFT=16 CONFIG_BLK_DEV_INITRD=y CONFIG_EXPERT=y CONFIG_KALLSYMS_ALL=y CONFIG_SLAB=y CONFIG_PROFILING=y CONFIG_OPROFILE=y # CONFIG_BLOCK is not set CONFIG_ARCH_VEXPRESS_CA9X4=y CONFIG_ARM_THUMBEE=y CONFIG_SMP=y CONFIG_NR_CPUS=2 CONFIG_ZBOOT_ROM_TEXT=0x0 CONFIG_ZBOOT_ROM_BSS=0x0 CONFIG_CMDLINE="root=/dev/mmcblk0p2 rootwait console=ttyO2,115200" CONFIG_KEXEC=y CONFIG_FPE_NWFPE=y CONFIG_BINFMT_MISC=y CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug" CONFIG_DEVTMPFS=y CONFIG_DEVTMPFS_MOUNT=y CONFIG_CMA=y CONFIG_INPUT_JOYDEV=y CONFIG_INPUT_EVDEV=y CONFIG_KEYBOARD_GPIO=y CONFIG_KEYBOARD_MATRIX=y CONFIG_INPUT_TOUCHSCREEN=y CONFIG_INPUT_MISC=y CONFIG_VT_HW_CONSOLE_BINDING=y # CONFIG_LEGACY_PTYS is not set CONFIG_SERIAL_8250=y CONFIG_SERIAL_8250_CONSOLE=y CONFIG_SERIAL_8250_NR_UARTS=32 CONFIG_SERIAL_8250_EXTENDED=y CONFIG_SERIAL_8250_MANY_PORTS=y CONFIG_SERIAL_8250_SHARE_IRQ=y CONFIG_SERIAL_8250_DETECT_IRQ=y CONFIG_SERIAL_8250_RSA=y CONFIG_SERIAL_AMBA_PL011=y CONFIG_SERIAL_AMBA_PL011_CONSOLE=y CONFIG_DEBUG_GPIO=y CONFIG_GPIO_SYSFS=y # CONFIG_HWMON is not set CONFIG_FB=y CONFIG_FIRMWARE_EDID=y CONFIG_FB_MODE_HELPERS=y CONFIG_FB_TILEBLITTING=y CONFIG_BACKLIGHT_LCD_SUPPORT=y CONFIG_LCD_PLATFORM=y CONFIG_FRAMEBUFFER_CONSOLE=y CONFIG_FRAMEBUFFER_CONSOLE_ROTATION=y CONFIG_FONTS=y CONFIG_FONT_8x8=y CONFIG_FONT_8x16=y CONFIG_LOGO=y # CONFIG_USB_SUPPORT is not set # CONFIG_IOMMU_SUPPORT is not set # CONFIG_FILE_LOCKING is not set # CONFIG_DNOTIFY is not set # CONFIG_INOTIFY_USER is not set CONFIG_TMPFS=y # CONFIG_MISC_FILESYSTEMS is not set CONFIG_PRINTK_TIME=y CONFIG_MAGIC_SYSRQ=y CONFIG_SCHEDSTATS=y CONFIG_TIMER_STATS=y # CONFIG_DEBUG_BUGVERBOSE is not set CONFIG_DEBUG_INFO=y # CONFIG_FTRACE is not set CONFIG_DEBUG_LL=y CONFIG_DEBUG_VEXPRESS_UART0_CA9=y CONFIG_EARLY_PRINTK=y
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