Prev: [00/24] 2.6.27.47-stable review
Next: [tip:x86/urgent] x86: "nosmp" command line option should force the system into UP mode
From: Olaf Hering on 24 May 2010 19:00

I get this warning when busybox /sbin/init opens the console.
It does not happen when CONFIG_PREEMPT_RT is enabled.
Any ideas how to fix it for CONFIG_PREEMPT_DESKTOP?

[ 16.450000] ------------[ cut here ]------------
[ 16.450000] WARNING: at /work/rt/linux-2.6.33-rt/kernel/mutex-debug.c:65 mutex_remove_waiter+0xe8/0x11c()
[ 16.450000] Modules linked in:
[ 16.450000] [<c0033e68>] (unwind_backtrace+0x0/0xdc) from [<c0324994>] (dump_stack+0x18/0x1c)
[ 16.450000] [<c0324994>] (dump_stack+0x18/0x1c) from [<c0049aec>] (warn_slowpath_common+0x50/0x68)
[ 16.450000] [<c0049aec>] (warn_slowpath_common+0x50/0x68) from [<c0049b1c>] (warn_slowpath_null+0x18/0x1c)
[ 16.450000] [<c0049b1c>] (warn_slowpath_null+0x18/0x1c) from [<c006d640>] (mutex_remove_waiter+0xe8/0x11c)
[ 16.450000] [<c006d640>] (mutex_remove_waiter+0xe8/0x11c) from [<c032709c>] (mutex_lock_nested+0x268/0x304)
[ 16.450000] [<c032709c>] (mutex_lock_nested+0x268/0x304) from [<c004a2d8>] (acquire_console_mutex+0x40/0x68)
[ 16.450000] [<c004a2d8>] (acquire_console_mutex+0x40/0x68) from [<c01d8420>] (con_open+0x18/0xc4)
[ 16.450000] [<c01d8420>] (con_open+0x18/0xc4) from [<c01c80dc>] (tty_open+0x398/0x55c)
[ 16.450000] [<c01c80dc>] (tty_open+0x398/0x55c) from [<c00ae628>] (chrdev_open+0x198/0x1bc)
[ 16.450000] [<c00ae628>] (chrdev_open+0x198/0x1bc) from [<c00a9928>] (__dentry_open+0x188/0x294)
[ 16.450000] [<c00a9928>] (__dentry_open+0x188/0x294) from [<c00a9b04>] (nameidata_to_filp+0x48/0x60)
[ 16.450000] [<c00a9b04>] (nameidata_to_filp+0x48/0x60) from [<c00b795c>] (do_filp_open+0x42c/0x8a8)
[ 16.450000] [<c00b795c>] (do_filp_open+0x42c/0x8a8) from [<c00a968c>] (do_sys_open+0x64/0x11c)
[ 16.450000] [<c00a968c>] (do_sys_open+0x64/0x11c) from [<c00a977c>] (sys_open+0x24/0x28)
[ 16.450000] [<c00a977c>] (sys_open+0x24/0x28) from [<c002e000>] (ret_fast_syscall+0x0/0x34)
[ 16.450000] ---[ end trace cdbe849ecfa1acdf ]---

The used config is shown after dmesg.


[ 0.000000] Linux version 2.6.33.4-rt20-arm9-at91sam9263ek (olaf(a)esprimo) (gcc version 4.4.4 (GCC) ) #13 PREEMPT Mon May 24 23:06:36 CEST 2010
[ 0.000000] CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00053177
[ 0.000000] CPU: VIVT data cache, VIVT instruction cache
[ 0.000000] Machine: Atmel AT91SAM9263-EK
[ 0.000000] Ignoring unrecognised tag 0x54410008
[ 0.000000] Memory policy: ECC disabled, Data cache writeback
[ 0.000000] On node 0 totalpages: 16384
[ 0.000000] free_area_init_node: node 0, pgdat c049351c, node_mem_map c0ba6000
[ 0.000000] Normal zone: 128 pages used for memmap
[ 0.000000] Normal zone: 0 pages reserved
[ 0.000000] Normal zone: 16256 pages, LIFO batch:3
[ 0.000000] Clocks: CPU 199 MHz, master 99 MHz, main 16.367 MHz
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256
[ 0.000000] Kernel command line: console=ttyS0 root=/dev/nfs nfsroot=192.168.2.100:/opt/cross/sys-root/arm-linux-gnueabi,tcp rw debug ip=dhcp panic=3
[ 0.000000] PID hash table entries: 256 (order: -2, 1024 bytes)
[ 0.000000] Dentry cache hash table entries: 8192 (order: 6, 262144 bytes)
[ 0.000000] Inode-cache hash table entries: 4096 (order: 5, 131072 bytes)
[ 0.000000] Memory: 64MB = 64MB total
[ 0.000000] Memory: 52636KB available (4044K code, 7435K data, 148K init, 0K highmem)
[ 0.000000] Hierarchical RCU implementation.
[ 0.000000] NR_IRQS:192
[ 0.000000] AT91: 160 gpio irqs in 5 banks
[ 0.000000] Console: colour dummy device 80x30
[ 0.000000] console [ttyS0] enabled
[ 0.000000] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
[ 0.000000] ... MAX_LOCKDEP_SUBCLASSES: 8
[ 0.000000] ... MAX_LOCK_DEPTH: 48
[ 0.000000] ... MAX_LOCKDEP_KEYS: 8191
[ 0.000000] ... CLASSHASH_SIZE: 4096
[ 0.000000] ... MAX_LOCKDEP_ENTRIES: 16384
[ 0.000000] ... MAX_LOCKDEP_CHAINS: 32768
[ 0.000000] ... CHAINHASH_SIZE: 16384
[ 0.000000] memory used by lock dependency info: 3695 kB
[ 0.000000] per task-struct memory footprint: 1152 bytes
[ 0.190000] Calibrating delay loop... 98.91 BogoMIPS (lpj=494592)
[ 0.400000] Mount-cache hash table entries: 512
[ 0.430000] CPU: Testing write buffer coherency: ok
[ 0.490000] khelper used greatest stack depth: 6464 bytes left
[ 0.490000] khelper used greatest stack depth: 5936 bytes left
[ 0.540000] NET: Registered protocol family 16
[ 0.640000] tcb_clksrc: tc0 at 12.994 MHz
[ 0.820000] bio: create slab <bio-0> at 0
[ 0.840000] SCSI subsystem initialized
[ 0.860000] usbcore: registered new interface driver usbfs
[ 0.870000] usbcore: registered new interface driver hub
[ 0.880000] usbcore: registered new device driver usb
[ 0.910000] Switching to clocksource tcb_clksrc
[ 0.940000] NET: Registered protocol family 2
[ 0.950000] IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.960000] TCP established hash table entries: 2048 (order: 2, 16384 bytes)
[ 0.970000] TCP bind hash table entries: 2048 (order: 4, 65536 bytes)
[ 0.990000] TCP: Hash tables configured (established 2048 bind 2048)
[ 0.990000] TCP reno registered
[ 1.000000] UDP hash table entries: 64 (order: 0, 5120 bytes)
[ 1.000000] UDP-Lite hash table entries: 64 (order: 0, 5120 bytes)
[ 1.020000] NET: Registered protocol family 1
[ 1.030000] RPC: Registered udp transport module.
[ 1.030000] RPC: Registered tcp transport module.
[ 1.040000] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 1.050000] NetWinder Floating Point Emulator V0.97 (double precision)
[ 1.090000] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 1.120000] Slow work thread pool: Starting up
[ 1.120000] Slow work thread pool: Ready
[ 1.130000] JFFS2 version 2.2. (NAND) © 2001-2006 Red Hat, Inc.
[ 1.140000] msgmni has been set to 102
[ 1.150000] io scheduler noop registered (default)
[ 1.160000] atmel_lcdfb atmel_lcdfb.0: backlight control is not available
[ 1.170000] atmel_lcdfb atmel_lcdfb.0: 150KiB frame buffer at 23a00000 (mapped at ffc00000)
[ 1.270000] Console: switching to colour frame buffer device 30x40
[ 1.280000] atmel_lcdfb atmel_lcdfb.0: fb0: Atmel LCDC at 0x00700000 (mapped at c4876000), irq 26
[ 1.490000] atmel_usart.0: ttyS0 at MMIO 0xfeffee00 (irq = 1) is a ATMEL_SERIAL
[ 1.510000] atmel_usart.1: ttyS1 at MMIO 0xfff8c000 (irq = 7) is a ATMEL_SERIAL
[ 1.650000] brd: module loaded
[ 1.690000] khelper used greatest stack depth: 5864 bytes left
[ 1.720000] loop: module loaded
[ 1.770000] NAND device: Manufacturer ID: 0x2c, Chip ID: 0xda (Micron NAND 256MiB 3,3V 8-bit)
[ 1.780000] Scanning device for bad blocks
[ 1.810000] Bad eraseblock 301 at 0x0000025a0000
[ 1.820000] Bad eraseblock 514 at 0x000004040000
[ 1.870000] Bad eraseblock 1180 at 0x000009380000
[ 1.870000] Bad eraseblock 1193 at 0x000009520000
[ 1.890000] Bad eraseblock 1365 at 0x00000aaa0000
[ 1.930000] Creating 2 MTD partitions on "atmel_nand":
[ 1.940000] 0x000000000000-0x000004000000 : "Partition 1"
[ 1.970000] 0x000004000000-0x000010000000 : "Partition 2"
[ 1.990000] atmel_spi atmel_spi.0: Atmel SPI Controller at 0xfffa4000 (irq 14)
[ 2.030000] CAN device driver interface
[ 2.050000] MACB_mii_bus: probed
[ 2.060000] eth0: Atmel MACB at 0xfffbc000 irq 21 (3a:1f:34:08:54:54)
[ 2.060000] eth0: attached PHY driver [Generic PHY] (mii_bus:phy_addr=ffffffff:00, irq=-1)
[ 2.080000] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 2.090000] at91_ohci at91_ohci: AT91 OHCI
[ 2.120000] at91_ohci at91_ohci: new USB bus registered, assigned bus number 1
[ 2.130000] at91_ohci at91_ohci: irq 29, io mem 0x00a00000
[ 2.200000] usb usb1: New USB device found, idVendor=1d6b, idProduct=0001
[ 2.210000] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 2.220000] usb usb1: Product: AT91 OHCI
[ 2.220000] usb usb1: Manufacturer: Linux 2.6.33.4-rt20-arm9-at91sam9263ek ohci_hcd
[ 2.230000] usb usb1: SerialNumber: at91
[ 2.260000] hub 1-0:1.0: USB hub found
[ 2.260000] hub 1-0:1.0: 2 ports detected
[ 2.280000] Initializing USB Mass Storage driver...
[ 2.290000] usbcore: registered new interface driver usb-storage
[ 2.300000] USB Mass Storage support registered.
[ 2.300000] usbcore: registered new interface driver ums-alauda
[ 2.310000] usbcore: registered new interface driver ums-cypress
[ 2.320000] usbcore: registered new interface driver ums-datafab
[ 2.330000] usbcore: registered new interface driver ums-freecom
[ 2.340000] usbcore: registered new interface driver ums-isd200
[ 2.350000] usbcore: registered new interface driver ums-jumpshot
[ 2.360000] usbcore: registered new interface driver ums-karma
[ 2.360000] usbcore: registered new interface driver ums-onetouch
[ 2.380000] usbcore: registered new interface driver ums-sddr09
[ 2.390000] usbcore: registered new interface driver ums-sddr55
[ 2.390000] usbcore: registered new interface driver ums-usbat
[ 2.400000] udc: at91_udc version 3 May 2006
[ 2.410000] mice: PS/2 mouse device common for all mice
[ 2.420000] input: gpio-keys as /devices/platform/gpio-keys/input/input0
[ 2.440000] ads7846 spi0.3: external vREF for ADS7843 not specified
[ 2.450000] ads7846 spi0.3: touchscreen, irq 31
[ 2.460000] input: ADS7843 Touchscreen as /devices/platform/atmel_spi.0/spi0.3/input/input1
[ 2.490000] rtc-at91sam9 at91_rtt.0: rtc core: registered at91_rtt as rtc0
[ 2.490000] IRQ 1/rtc0: IRQF_DISABLED is not guaranteed on shared IRQs
[ 2.500000] rtc-at91sam9 at91_rtt.0: rtc0: SET TIME!
[ 2.510000] i2c /dev entries driver
[ 2.530000] at24 0-0050: 65536 byte 24c512 EEPROM (writable)
[ 2.550000] i2c-gpio i2c-gpio: using pins 68 (SDA) and 69 (SCL)
[ 2.560000] AT91SAM9 Watchdog: sorry, watchdog is disabled
[ 2.570000] at91_wdt: probe of at91_wdt failed with error -5
[ 2.650000] usbcore: registered new interface driver hiddev
[ 2.660000] usbcore: registered new interface driver usbhid
[ 2.670000] usbhid: USB HID core driver
[ 2.670000] TCP cubic registered
[ 2.680000] NET: Registered protocol family 10
[ 2.690000] lo: Disabled Privacy Extensions
[ 2.700000] IPv6 over IPv4 tunneling driver
[ 2.710000] sit0: Disabled Privacy Extensions
[ 2.720000] NET: Registered protocol family 17
[ 2.730000] can: controller area network core (rev 20090105 abi 8)
[ 2.730000] NET: Registered protocol family 29
[ 2.740000] can: raw protocol (rev 20090105)
[ 2.740000] can: broadcast manager protocol (rev 20090105 t)
[ 2.760000] rtc-at91sam9 at91_rtt.0: hctosys: unable to read the hardware clock
[ 4.310000] Sending DHCP requests .
[ 5.060000] eth0: link up (100/Full)
[ 6.500000] ., OK
[ 6.520000] IP-Config: Got DHCP answer from 192.168.2.100, my address is 192.168.2.42
[ 6.530000] IP-Config: Complete:
[ 6.530000] device=eth0, addr=192.168.2.42, mask=255.255.255.0, gw=192.168.2.100,
[ 6.540000] host=at91sam9263ek, domain=easybox, nis-domain=(none),
[ 6.550000] bootserver=192.168.2.100, rootserver=192.168.2.100, rootpath=
[ 6.560000] Looking up port of RPC 100003/2 on 192.168.2.100
[ 6.610000] Looking up port of RPC 100005/1 on 192.168.2.100
[ 6.980000] VFS: Mounted root (nfs filesystem) on device 0:14.
[ 6.980000] *****************************************************************************
[ 6.990000] * *
[ 7.000000] * REMINDER, the following debugging options are turned on in your .config: *
[ 7.010000] * *
[ 7.020000] * CONFIG_DEBUG_RT_MUTEXES *
[ 7.030000] * CONFIG_LOCKDEP *
[ 7.040000] * *
[ 7.050000] * they may increase runtime overhead and latencies. *
[ 7.050000] * *
[ 7.060000] *****************************************************************************
[ 7.070000] Freeing init memory: 148K
[ 9.940000] ldconfig used greatest stack depth: 3480 bytes left
[ 13.430000] eth0: no IPv6 routers present
[ 16.240000] /etc/init.d/rcS done.
[ 16.450000] ------------[ cut here ]------------
[ 16.450000] WARNING: at /work/rt/linux-2.6.33-rt/kernel/mutex-debug.c:65 mutex_remove_waiter+0xe8/0x11c()
[ 16.450000] Modules linked in:
[ 16.450000] [<c0033e68>] (unwind_backtrace+0x0/0xdc) from [<c0324994>] (dump_stack+0x18/0x1c)
[ 16.450000] [<c0324994>] (dump_stack+0x18/0x1c) from [<c0049aec>] (warn_slowpath_common+0x50/0x68)
[ 16.450000] [<c0049aec>] (warn_slowpath_common+0x50/0x68) from [<c0049b1c>] (warn_slowpath_null+0x18/0x1c)
[ 16.450000] [<c0049b1c>] (warn_slowpath_null+0x18/0x1c) from [<c006d640>] (mutex_remove_waiter+0xe8/0x11c)
[ 16.450000] [<c006d640>] (mutex_remove_waiter+0xe8/0x11c) from [<c032709c>] (mutex_lock_nested+0x268/0x304)
[ 16.450000] [<c032709c>] (mutex_lock_nested+0x268/0x304) from [<c004a2d8>] (acquire_console_mutex+0x40/0x68)
[ 16.450000] [<c004a2d8>] (acquire_console_mutex+0x40/0x68) from [<c01d8420>] (con_open+0x18/0xc4)
[ 16.450000] [<c01d8420>] (con_open+0x18/0xc4) from [<c01c80dc>] (tty_open+0x398/0x55c)
[ 16.450000] [<c01c80dc>] (tty_open+0x398/0x55c) from [<c00ae628>] (chrdev_open+0x198/0x1bc)
[ 16.450000] [<c00ae628>] (chrdev_open+0x198/0x1bc) from [<c00a9928>] (__dentry_open+0x188/0x294)
[ 16.450000] [<c00a9928>] (__dentry_open+0x188/0x294) from [<c00a9b04>] (nameidata_to_filp+0x48/0x60)
[ 16.450000] [<c00a9b04>] (nameidata_to_filp+0x48/0x60) from [<c00b795c>] (do_filp_open+0x42c/0x8a8)
[ 16.450000] [<c00b795c>] (do_filp_open+0x42c/0x8a8) from [<c00a968c>] (do_sys_open+0x64/0x11c)
[ 16.450000] [<c00a968c>] (do_sys_open+0x64/0x11c) from [<c00a977c>] (sys_open+0x24/0x28)
[ 16.450000] [<c00a977c>] (sys_open+0x24/0x28) from [<c002e000>] (ret_fast_syscall+0x0/0x34)
[ 16.450000] ---[ end trace cdbe849ecfa1acdf ]---


CONFIG_ARM=y
CONFIG_SYS_SUPPORTS_APM_EMULATION=y
CONFIG_GENERIC_GPIO=y
CONFIG_GENERIC_TIME=y
CONFIG_GENERIC_CLOCKEVENTS=y
CONFIG_GENERIC_HARDIRQS=y
CONFIG_STACKTRACE_SUPPORT=y
CONFIG_HAVE_LATENCYTOP_SUPPORT=y
CONFIG_LOCKDEP_SUPPORT=y
CONFIG_TRACE_IRQFLAGS_SUPPORT=y
CONFIG_HARDIRQS_SW_RESEND=y
CONFIG_GENERIC_IRQ_PROBE=y
CONFIG_RWSEM_GENERIC_SPINLOCK=y
CONFIG_GENERIC_HWEIGHT=y
CONFIG_GENERIC_CALIBRATE_DELAY=y
CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ=y
CONFIG_VECTORS_BASE=0xffff0000
CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
CONFIG_CONSTRUCTORS=y
CONFIG_EXPERIMENTAL=y
CONFIG_BROKEN_ON_SMP=y
CONFIG_LOCK_KERNEL=y
CONFIG_INIT_ENV_ARG_LIMIT=32
CONFIG_LOCALVERSION="-arm9-at91sam9263ek"
CONFIG_LOCALVERSION_AUTO=y
CONFIG_HAVE_KERNEL_GZIP=y
CONFIG_HAVE_KERNEL_LZO=y
CONFIG_KERNEL_GZIP=y
CONFIG_SYSVIPC=y
CONFIG_SYSVIPC_SYSCTL=y
CONFIG_POSIX_MQUEUE=y
CONFIG_POSIX_MQUEUE_SYSCTL=y
CONFIG_TREE_RCU=y
CONFIG_RCU_FANOUT=32
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
CONFIG_LOG_BUF_SHIFT=21
CONFIG_RELAY=y
CONFIG_NAMESPACES=y
CONFIG_BLK_DEV_INITRD=y
CONFIG_INITRAMFS_SOURCE=""
CONFIG_RD_GZIP=y
CONFIG_RD_BZIP2=y
CONFIG_RD_LZMA=y
CONFIG_RD_LZO=y
CONFIG_CC_OPTIMIZE_FOR_SIZE=y
CONFIG_SYSCTL=y
CONFIG_ANON_INODES=y
CONFIG_UID16=y
CONFIG_SYSCTL_SYSCALL=y
CONFIG_KALLSYMS=y
CONFIG_KALLSYMS_ALL=y
CONFIG_HOTPLUG=y
CONFIG_PRINTK=y
CONFIG_BUG=y
CONFIG_ELF_CORE=y
CONFIG_BASE_FULL=y
CONFIG_FUTEX=y
CONFIG_EPOLL=y
CONFIG_SIGNALFD=y
CONFIG_TIMERFD=y
CONFIG_EVENTFD=y
CONFIG_SHMEM=y
CONFIG_AIO=y
CONFIG_VM_EVENT_COUNTERS=y
CONFIG_COMPAT_BRK=y
CONFIG_SLAB=y
CONFIG_HAVE_OPROFILE=y
CONFIG_HAVE_KPROBES=y
CONFIG_HAVE_KRETPROBES=y
CONFIG_HAVE_CLK=y
CONFIG_SLOW_WORK=y
CONFIG_HAVE_GENERIC_DMA_COHERENT=y
CONFIG_SLABINFO=y
CONFIG_RT_MUTEXES=y
CONFIG_BASE_SMALL=0
CONFIG_MODULES=y
CONFIG_MODULE_FORCE_LOAD=y
CONFIG_MODULE_UNLOAD=y
CONFIG_BLOCK=y
CONFIG_IOSCHED_NOOP=y
CONFIG_DEFAULT_NOOP=y
CONFIG_DEFAULT_IOSCHED="noop"
CONFIG_MMU=y
CONFIG_ARCH_AT91=y
CONFIG_HAVE_AT91_DATAFLASH_CARD=y
CONFIG_HAVE_NAND_ATMEL_BUSWIDTH_16=y
CONFIG_ARCH_AT91SAM9263=y
CONFIG_AT91_PMC_UNIT=y
CONFIG_MACH_AT91SAM9263EK=y
CONFIG_MTD_AT91_DATAFLASH_CARD=y
CONFIG_AT91_PROGRAMMABLE_CLOCKS=y
CONFIG_AT91_TIMER_HZ=100
CONFIG_AT91_EARLY_DBGU=y
CONFIG_CPU_ARM926T=y
CONFIG_CPU_32v5=y
CONFIG_CPU_ABRT_EV5TJ=y
CONFIG_CPU_PABRT_LEGACY=y
CONFIG_CPU_CACHE_VIVT=y
CONFIG_CPU_COPY_V4WB=y
CONFIG_CPU_TLB_V4WBI=y
CONFIG_CPU_CP15=y
CONFIG_CPU_CP15_MMU=y
CONFIG_ARM_THUMB=y
CONFIG_ARM_L1_CACHE_SHIFT=5
CONFIG_TICK_ONESHOT=y
CONFIG_HIGH_RES_TIMERS=y
CONFIG_GENERIC_CLOCKEVENTS_BUILD=y
CONFIG_VMSPLIT_3G=y
CONFIG_PAGE_OFFSET=0xC0000000
CONFIG_PREEMPT_DESKTOP=y
CONFIG_PREEMPT=y
CONFIG_HZ=100
CONFIG_AEABI=y
CONFIG_OABI_COMPAT=y
CONFIG_SELECT_MEMORY_MODEL=y
CONFIG_FLATMEM_MANUAL=y
CONFIG_FLATMEM=y
CONFIG_FLAT_NODE_MEM_MAP=y
CONFIG_PAGEFLAGS_EXTENDED=y
CONFIG_SPLIT_PTLOCK_CPUS=999999
CONFIG_ZONE_DMA_FLAG=0
CONFIG_VIRT_TO_BUS=y
CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
CONFIG_ALIGNMENT_TRAP=y
CONFIG_ZBOOT_ROM_TEXT=0
CONFIG_ZBOOT_ROM_BSS=0
CONFIG_CMDLINE="debug panic=3 console=ttyS0,115200 mem=64M"
CONFIG_FPE_NWFPE=y
CONFIG_BINFMT_ELF=y
CONFIG_HAVE_AOUT=y
CONFIG_BINFMT_MISC=y
CONFIG_ARCH_SUSPEND_POSSIBLE=y
CONFIG_NET=y
CONFIG_PACKET=y
CONFIG_UNIX=y
CONFIG_XFRM=y
CONFIG_INET=y
CONFIG_IP_FIB_HASH=y
CONFIG_IP_PNP=y
CONFIG_IP_PNP_DHCP=y
CONFIG_INET_TUNNEL=y
CONFIG_TCP_CONG_CUBIC=y
CONFIG_DEFAULT_TCP_CONG="cubic"
CONFIG_IPV6=y
CONFIG_IPV6_PRIVACY=y
CONFIG_IPV6_ROUTER_PREF=y
CONFIG_IPV6_ROUTE_INFO=y
CONFIG_IPV6_OPTIMISTIC_DAD=y
CONFIG_INET6_XFRM_MODE_TRANSPORT=y
CONFIG_INET6_XFRM_MODE_TUNNEL=y
CONFIG_INET6_XFRM_MODE_BEET=y
CONFIG_IPV6_SIT=y
CONFIG_IPV6_NDISC_NODETYPE=y
CONFIG_CAN=y
CONFIG_CAN_RAW=y
CONFIG_CAN_BCM=y
CONFIG_CAN_VCAN=m
CONFIG_CAN_DEV=y
CONFIG_CAN_CALC_BITTIMING=y
CONFIG_CAN_AT91=m
CONFIG_CAN_MCP251X=m
CONFIG_CAN_SJA1000=m
CONFIG_CAN_SJA1000_PLATFORM=m
CONFIG_CAN_EMS_USB=m
CONFIG_CAN_DEBUG_DEVICES=y
CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
CONFIG_STANDALONE=y
CONFIG_PREVENT_FIRMWARE_BUILD=y
CONFIG_FW_LOADER=y
CONFIG_FIRMWARE_IN_KERNEL=y
CONFIG_EXTRA_FIRMWARE=""
CONFIG_MTD=y
CONFIG_MTD_PARTITIONS=y
CONFIG_MTD_CMDLINE_PARTS=y
CONFIG_MTD_CHAR=y
CONFIG_MTD_BLKDEVS=y
CONFIG_MTD_BLOCK=y
CONFIG_MTD_MAP_BANK_WIDTH_1=y
CONFIG_MTD_MAP_BANK_WIDTH_2=y
CONFIG_MTD_MAP_BANK_WIDTH_4=y
CONFIG_MTD_CFI_I1=y
CONFIG_MTD_CFI_I2=y
CONFIG_MTD_DATAFLASH=y
CONFIG_MTD_NAND=y
CONFIG_MTD_NAND_IDS=y
CONFIG_MTD_NAND_ATMEL=y
CONFIG_MTD_NAND_ATMEL_ECC_HW=y
CONFIG_BLK_DEV=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_COUNT=16
CONFIG_BLK_DEV_RAM_SIZE=8192
CONFIG_MISC_DEVICES=y
CONFIG_ATMEL_TCLIB=y
CONFIG_ATMEL_TCB_CLKSRC=y
CONFIG_ATMEL_TCB_CLKSRC_BLOCK=0
CONFIG_ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK=y
CONFIG_ATMEL_SSC=y
CONFIG_EEPROM_AT24=y
CONFIG_HAVE_IDE=y
CONFIG_SCSI=y
CONFIG_SCSI_DMA=y
CONFIG_SCSI_PROC_FS=y
CONFIG_BLK_DEV_SD=y
CONFIG_BLK_DEV_SR=y
CONFIG_BLK_DEV_SR_VENDOR=y
CONFIG_CHR_DEV_SG=y
CONFIG_SCSI_MULTI_LUN=y
CONFIG_SCSI_WAIT_SCAN=m
CONFIG_SCSI_LOWLEVEL=y
CONFIG_NETDEVICES=y
CONFIG_PHYLIB=y
CONFIG_NET_ETHERNET=y
CONFIG_MII=y
CONFIG_MACB=y
CONFIG_USB_CATC=m
CONFIG_USB_KAWETH=m
CONFIG_USB_PEGASUS=m
CONFIG_USB_RTL8150=m
CONFIG_USB_USBNET=m
CONFIG_USB_NET_AX8817X=m
CONFIG_USB_NET_CDCETHER=m
CONFIG_USB_NET_CDC_EEM=m
CONFIG_USB_NET_DM9601=m
CONFIG_USB_NET_SMSC95XX=m
CONFIG_USB_NET_GL620A=m
CONFIG_USB_NET_NET1080=m
CONFIG_USB_NET_PLUSB=m
CONFIG_USB_NET_MCS7830=m
CONFIG_USB_NET_RNDIS_HOST=m
CONFIG_USB_NET_CDC_SUBSET=m
CONFIG_USB_ALI_M5632=y
CONFIG_USB_AN2720=y
CONFIG_USB_BELKIN=y
CONFIG_USB_ARMLINUX=y
CONFIG_USB_EPSON2888=y
CONFIG_USB_KC2190=y
CONFIG_USB_NET_ZAURUS=m
CONFIG_USB_NET_INT51X1=m
CONFIG_INPUT=y
CONFIG_INPUT_POLLDEV=y
CONFIG_INPUT_MOUSEDEV=y
CONFIG_INPUT_MOUSEDEV_SCREEN_X=1024
CONFIG_INPUT_MOUSEDEV_SCREEN_Y=768
CONFIG_INPUT_EVDEV=y
CONFIG_INPUT_KEYBOARD=y
CONFIG_KEYBOARD_GPIO=y
CONFIG_INPUT_MOUSE=y
CONFIG_MOUSE_GPIO=y
CONFIG_INPUT_TOUCHSCREEN=y
CONFIG_TOUCHSCREEN_ADS7846=y
CONFIG_VT=y
CONFIG_CONSOLE_TRANSLATIONS=y
CONFIG_VT_CONSOLE=y
CONFIG_HW_CONSOLE=y
CONFIG_DEVKMEM=y
CONFIG_SERIAL_ATMEL=y
CONFIG_SERIAL_ATMEL_CONSOLE=y
CONFIG_SERIAL_ATMEL_PDC=y
CONFIG_SERIAL_CORE=y
CONFIG_SERIAL_CORE_CONSOLE=y
CONFIG_UNIX98_PTYS=y
CONFIG_HW_RANDOM=y
CONFIG_I2C=y
CONFIG_I2C_BOARDINFO=y
CONFIG_I2C_COMPAT=y
CONFIG_I2C_CHARDEV=y
CONFIG_I2C_HELPER_AUTO=y
CONFIG_I2C_ALGOBIT=y
CONFIG_I2C_GPIO=y
CONFIG_SPI=y
CONFIG_SPI_MASTER=y
CONFIG_SPI_ATMEL=y
CONFIG_ARCH_REQUIRE_GPIOLIB=y
CONFIG_GPIOLIB=y
CONFIG_GPIO_SYSFS=y
CONFIG_HWMON=y
CONFIG_SENSORS_LM75=y
CONFIG_WATCHDOG=y
CONFIG_WATCHDOG_NOWAYOUT=y
CONFIG_AT91SAM9X_WATCHDOG=y
CONFIG_SSB_POSSIBLE=y
CONFIG_HAVE_FB_ATMEL=y
CONFIG_FB=y
CONFIG_FB_CFB_FILLRECT=y
CONFIG_FB_CFB_COPYAREA=y
CONFIG_FB_CFB_IMAGEBLIT=y
CONFIG_FB_ATMEL=y
CONFIG_DUMMY_CONSOLE=y
CONFIG_FRAMEBUFFER_CONSOLE=y
CONFIG_FONT_8x8=y
CONFIG_FONT_8x16=y
CONFIG_LOGO=y
CONFIG_LOGO_LINUX_CLUT224=y
CONFIG_HID_SUPPORT=y
CONFIG_HID=y
CONFIG_HIDRAW=y
CONFIG_USB_HID=y
CONFIG_USB_HIDDEV=y
CONFIG_HID_A4TECH=y
CONFIG_HID_APPLE=y
CONFIG_HID_BELKIN=y
CONFIG_HID_CHERRY=y
CONFIG_HID_CHICONY=y
CONFIG_HID_CYPRESS=y
CONFIG_HID_DRAGONRISE=y
CONFIG_HID_EZKEY=y
CONFIG_HID_KYE=y
CONFIG_HID_GYRATION=y
CONFIG_HID_TWINHAN=y
CONFIG_HID_KENSINGTON=y
CONFIG_HID_LOGITECH=y
CONFIG_HID_MICROSOFT=y
CONFIG_HID_MONTEREY=y
CONFIG_HID_NTRIG=y
CONFIG_HID_PANTHERLORD=y
CONFIG_HID_PETALYNX=y
CONFIG_HID_SAMSUNG=y
CONFIG_HID_SONY=y
CONFIG_HID_SUNPLUS=y
CONFIG_HID_GREENASIA=y
CONFIG_HID_SMARTJOYPLUS=y
CONFIG_HID_TOPSEED=y
CONFIG_HID_THRUSTMASTER=y
CONFIG_HID_ZEROPLUS=y
CONFIG_USB_SUPPORT=y
CONFIG_USB_ARCH_HAS_HCD=y
CONFIG_USB_ARCH_HAS_OHCI=y
CONFIG_USB=y
CONFIG_USB_ANNOUNCE_NEW_DEVICES=y
CONFIG_USB_DEVICEFS=y
CONFIG_USB_DEVICE_CLASS=y
CONFIG_USB_MON=y
CONFIG_USB_OHCI_HCD=y
CONFIG_USB_OHCI_LITTLE_ENDIAN=y
CONFIG_USB_STORAGE=y
CONFIG_USB_STORAGE_DATAFAB=y
CONFIG_USB_STORAGE_FREECOM=y
CONFIG_USB_STORAGE_ISD200=y
CONFIG_USB_STORAGE_USBAT=y
CONFIG_USB_STORAGE_SDDR09=y
CONFIG_USB_STORAGE_SDDR55=y
CONFIG_USB_STORAGE_JUMPSHOT=y
CONFIG_USB_STORAGE_ALAUDA=y
CONFIG_USB_STORAGE_ONETOUCH=y
CONFIG_USB_STORAGE_KARMA=y
CONFIG_USB_STORAGE_CYPRESS_ATACB=y
CONFIG_USB_GADGET=y
CONFIG_USB_GADGET_VBUS_DRAW=2
CONFIG_USB_GADGET_SELECTED=y
CONFIG_USB_GADGET_AT91=y
CONFIG_USB_AT91=y
CONFIG_USB_ZERO=m
CONFIG_USB_ETH=m
CONFIG_USB_ETH_RNDIS=y
CONFIG_USB_GADGETFS=m
CONFIG_USB_FILE_STORAGE=m
CONFIG_USB_G_SERIAL=m
CONFIG_USB_CDC_COMPOSITE=m
CONFIG_USB_G_MULTI=m
CONFIG_USB_G_MULTI_RNDIS=y
CONFIG_MMC=y
CONFIG_MMC_BLOCK=y
CONFIG_MMC_BLOCK_BOUNCE=y
CONFIG_MMC_AT91=m
CONFIG_MMC_ATMELMCI=m
CONFIG_RTC_LIB=y
CONFIG_RTC_CLASS=y
CONFIG_RTC_HCTOSYS=y
CONFIG_RTC_HCTOSYS_DEVICE="rtc0"
CONFIG_RTC_INTF_SYSFS=y
CONFIG_RTC_INTF_PROC=y
CONFIG_RTC_INTF_DEV=y
CONFIG_RTC_DRV_AT91SAM9=y
CONFIG_RTC_DRV_AT91SAM9_RTT=0
CONFIG_RTC_DRV_AT91SAM9_GPBR=0
CONFIG_UIO=y
CONFIG_UIO_PDRV=y
CONFIG_FILE_LOCKING=y
CONFIG_FSNOTIFY=y
CONFIG_DNOTIFY=y
CONFIG_INOTIFY=y
CONFIG_INOTIFY_USER=y
CONFIG_ISO9660_FS=y
CONFIG_JOLIET=y
CONFIG_ZISOFS=y
CONFIG_UDF_FS=y
CONFIG_UDF_NLS=y
CONFIG_FAT_FS=y
CONFIG_VFAT_FS=y
CONFIG_FAT_DEFAULT_CODEPAGE=437
CONFIG_FAT_DEFAULT_IOCHARSET="iso8859-1"
CONFIG_PROC_FS=y
CONFIG_PROC_SYSCTL=y
CONFIG_PROC_PAGE_MONITOR=y
CONFIG_SYSFS=y
CONFIG_TMPFS=y
CONFIG_MISC_FILESYSTEMS=y
CONFIG_HFS_FS=y
CONFIG_HFSPLUS_FS=y
CONFIG_JFFS2_FS=y
CONFIG_JFFS2_FS_DEBUG=0
CONFIG_JFFS2_FS_WRITEBUFFER=y
CONFIG_JFFS2_ZLIB=y
CONFIG_JFFS2_RTIME=y
CONFIG_CRAMFS=y
CONFIG_SQUASHFS=y
CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE=3
CONFIG_NETWORK_FILESYSTEMS=y
CONFIG_NFS_FS=y
CONFIG_NFS_V3=y
CONFIG_ROOT_NFS=y
CONFIG_LOCKD=y
CONFIG_LOCKD_V4=y
CONFIG_NFS_COMMON=y
CONFIG_SUNRPC=y
CONFIG_CIFS=y
CONFIG_CIFS_WEAK_PW_HASH=y
CONFIG_CIFS_XATTR=y
CONFIG_CIFS_POSIX=y
CONFIG_PARTITION_ADVANCED=y
CONFIG_MAC_PARTITION=y
CONFIG_MSDOS_PARTITION=y
CONFIG_NLS=y
CONFIG_NLS_DEFAULT="iso8859-1"
CONFIG_NLS_CODEPAGE_437=y
CONFIG_NLS_CODEPAGE_850=y
CONFIG_NLS_ISO8859_1=y
CONFIG_NLS_ISO8859_15=y
CONFIG_NLS_UTF8=y
CONFIG_PRINTK_TIME=y
CONFIG_FRAME_WARN=1024
CONFIG_MAGIC_SYSRQ=y
CONFIG_DEBUG_FS=y
CONFIG_DEBUG_KERNEL=y
CONFIG_DETECT_SOFTLOCKUP=y
CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC_VALUE=0
CONFIG_DETECT_HUNG_TASK=y
CONFIG_BOOTPARAM_HUNG_TASK_PANIC_VALUE=0
CONFIG_SCHED_DEBUG=y
CONFIG_SCHEDSTATS=y
CONFIG_DEBUG_PREEMPT=y
CONFIG_DEBUG_RT_MUTEXES=y
CONFIG_DEBUG_PI_LIST=y
CONFIG_DEBUG_SPINLOCK=y
CONFIG_DEBUG_MUTEXES=y
CONFIG_DEBUG_LOCK_ALLOC=y
CONFIG_PROVE_LOCKING=y
CONFIG_LOCKDEP=y
CONFIG_TRACE_IRQFLAGS=y
CONFIG_DEBUG_SPINLOCK_SLEEP=y
CONFIG_STACKTRACE=y
CONFIG_DEBUG_BUGVERBOSE=y
CONFIG_DEBUG_MEMORY_INIT=y
CONFIG_FRAME_POINTER=y
CONFIG_LATENCYTOP=y
CONFIG_HAVE_FUNCTION_TRACER=y
CONFIG_TRACING_SUPPORT=y
CONFIG_HAVE_ARCH_KGDB=y
CONFIG_ARM_UNWIND=y
CONFIG_DEBUG_USER=y
CONFIG_DEBUG_ERRORS=y
CONFIG_DEBUG_STACK_USAGE=y
CONFIG_DEBUG_LL=y
CONFIG_DEFAULT_SECURITY_DAC=y
CONFIG_DEFAULT_SECURITY=""
CONFIG_CRYPTO=y
CONFIG_CRYPTO_ALGAPI=m
CONFIG_CRYPTO_ALGAPI2=m
CONFIG_CRYPTO_RNG=m
CONFIG_CRYPTO_RNG2=m
CONFIG_CRYPTO_AES=m
CONFIG_CRYPTO_ANSI_CPRNG=m
CONFIG_CRYPTO_HW=y
CONFIG_BITREVERSE=y
CONFIG_GENERIC_FIND_LAST_BIT=y
CONFIG_CRC_ITU_T=y
CONFIG_CRC32=y
CONFIG_ZLIB_INFLATE=y
CONFIG_ZLIB_DEFLATE=y
CONFIG_LZO_DECOMPRESS=y
CONFIG_DECOMPRESS_GZIP=y
CONFIG_DECOMPRESS_BZIP2=y
CONFIG_DECOMPRESS_LZMA=y
CONFIG_DECOMPRESS_LZO=y
CONFIG_HAS_IOMEM=y
CONFIG_HAS_IOPORT=y
CONFIG_HAS_DMA=y
CONFIG_NLATTR=y
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo(a)vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
From: Olaf Hering on 30 May 2010 17:40
On Tue, May 25, Arnd Bergmann wrote:

> On Tuesday 25 May 2010, Olaf Hering wrote:
> > I get this warning when busybox /sbin/init opens the console.
> > It does not happen when CONFIG_PREEMPT_RT is enabled.
> > Any ideas how to fix it for CONFIG_PREEMPT_DESKTOP?
> >
> > [ 16.450000] ------------[ cut here ]------------
> > [ 16.450000] WARNING: at /work/rt/linux-2.6.33-rt/kernel/mutex-debug.c:65 mutex_remove_waiter+0xe8/0x11c()
> > [ 16.450000] Modules linked in:
> > [ 16.450000] [<c0033e68>] (unwind_backtrace+0x0/0xdc) from [<c0324994>] (dump_stack+0x18/0x1c)
> > [ 16.450000] [<c0324994>] (dump_stack+0x18/0x1c) from [<c0049aec>] (warn_slowpath_common+0x50/0x68)
> > [ 16.450000] [<c0049aec>] (warn_slowpath_common+0x50/0x68) from [<c0049b1c>] (warn_slowpath_null+0x18/0x1c)
> > [ 16.450000] [<c0049b1c>] (warn_slowpath_null+0x18/0x1c) from [<c006d640>] (mutex_remove_waiter+0xe8/0x11c)
> > [ 16.450000] [<c006d640>] (mutex_remove_waiter+0xe8/0x11c) from [<c032709c>] (mutex_lock_nested+0x268/0x304)
> > [ 16.450000] [<c032709c>] (mutex_lock_nested+0x268/0x304) from [<c004a2d8>] (acquire_console_mutex+0x40/0x68)
> > [ 16.450000] [<c004a2d8>] (acquire_console_mutex+0x40/0x68) from [<c01d8420>] (con_open+0x18/0xc4)
> > [ 16.450000] [<c01d8420>] (con_open+0x18/0xc4) from [<c01c80dc>] (tty_open+0x398/0x55c)
> > [ 16.450000] [<c01c80dc>] (tty_open+0x398/0x55c) from [<c00ae628>] (chrdev_open+0x198/0x1bc)
> > [ 16.450000] [<c00ae628>] (chrdev_open+0x198/0x1bc) from [<c00a9928>] (__dentry_open+0x188/0x294)
> > [ 16.450000] [<c00a9928>] (__dentry_open+0x188/0x294) from [<c00a9b04>] (nameidata_to_filp+0x48/0x60)
> > [ 16.450000] [<c00a9b04>] (nameidata_to_filp+0x48/0x60) from [<c00b795c>] (do_filp_open+0x42c/0x8a8)
> > [ 16.450000] [<c00b795c>] (do_filp_open+0x42c/0x8a8) from [<c00a968c>] (do_sys_open+0x64/0x11c)
> > [ 16.450000] [<c00a968c>] (do_sys_open+0x64/0x11c) from [<c00a977c>] (sys_open+0x24/0x28)
> > [ 16.450000] [<c00a977c>] (sys_open+0x24/0x28) from [<c002e000>] (ret_fast_syscall+0x0/0x34)
> > [ 16.450000] ---[ end trace cdbe849ecfa1acdf ]---
> >
> > The used config is shown after dmesg.
>
> As a wild guess, this might happen because we drop the BKL in
> mutex_lock_nested and might need to wait for it when we got the lock.
> The reason that this surfaces in -rt would be that the console_sem
> is replaced with a proper mutex there, on non-rt kernels this would
> be invisible.
>
> You could try to pull in the blk/tty branch from
> http://git.kernel.org/?p=linux/kernel/git/arnd/playground.git and enable
> CONFIG_TTY_MUTEX to see if that gives you better lockdep output,
> because that replaces the implicit dropping of the BKL with mutex operations
> that lockdep is aware of.

CONFIG_TTY_MUTEX depends on SMP and this ARM system does not support
CONFIG_SMP, its hidden by Kconfig dependencies.


Olaf
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo(a)vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
From: Olaf Hering on 2 Jun 2010 05:20
On Mon, May 31, Arnd Bergmann wrote:

> On Sunday 30 May 2010, Olaf Hering wrote:
> > > You could try to pull in the blk/tty branch from
> > > http://git.kernel.org/?p=linux/kernel/git/arnd/playground.git and enable
> > > CONFIG_TTY_MUTEX to see if that gives you better lockdep output,
> > > because that replaces the implicit dropping of the BKL with mutex operations
> > > that lockdep is aware of.
> >
> > CONFIG_TTY_MUTEX depends on SMP and this ARM system does not support
> > CONFIG_SMP, its hidden by Kconfig dependencies.


Arnd,

I do not have access to this ARM board anymore, and other systems I own
do not have hardware for serial console.
So I can not test or debug this further.


Olaf
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo(a)vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
 | 
Pages: 1
Prev: [00/24] 2.6.27.47-stable review
Next: [tip:x86/urgent] x86: "nosmp" command line option should force the system into UP mode