Date:	Sat, 18 Apr 2015 16:23:25 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	linux-kernel@...r.kernel.org
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: qemu:arm test failure due to commit 8053871d0f7f (smp: Fix
 smp_call_function_single_async() locking)

Hi all,

my qemu test for arm:vexpress fails with the latest upstream kernel. It fails
hard - I don't get any output from the console. Bisect points to commit
8053871d0f7f ("smp: Fix smp_call_function_single_async() locking").
Reverting this commit fixes the problem.

Please let me know if there is anything I can help to track down the problem.

Thanks,
Guenter

---
bisect log:

# bad: [34a984f7b0cc6355a1e0c184251d0d4cc86f44d2] Merge branch 'x86-pmem-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
# good: [39a8804455fb23f09157341d3ba7db6d7ae6ee76] Linux 4.0
git bisect start 'HEAD' 'v4.0'
# good: [c1c21f4e60ed4523292f1a89ff45a208bddd3849] i2c: core: Export bus recovery functions
git bisect good c1c21f4e60ed4523292f1a89ff45a208bddd3849
# good: [e693d73c20ffdb06840c9378f367bad849ac0d5d] parisc: remove use of seq_printf return value
git bisect good e693d73c20ffdb06840c9378f367bad849ac0d5d
# good: [d19d5efd8c8840aa4f38a6dfbfe500d8cc27de46] Merge tag 'powerpc-4.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux
git bisect good d19d5efd8c8840aa4f38a6dfbfe500d8cc27de46
# good: [96d928ed75c4ba4253e82910a697ec7b06ace8b4] Merge tag 'xtensa-20150416' of git://github.com/czankel/xtensa-linux
git bisect good 96d928ed75c4ba4253e82910a697ec7b06ace8b4
# good: [e2fdae7e7c5a690b10b2d2891ec819e554dc033d] Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
git bisect good e2fdae7e7c5a690b10b2d2891ec819e554dc033d
# good: [510965dd4a0a59504ba38455f77339ea8b4c6a70] Merge tag 'gpio-v4.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio
git bisect good 510965dd4a0a59504ba38455f77339ea8b4c6a70
# good: [10027551ccf5459cc771c31ac8bc8e5cc8db45f8] f2fs: pass checkpoint reason on roll-forward recovery
git bisect good 10027551ccf5459cc771c31ac8bc8e5cc8db45f8
# good: [d6a24d0640d609138a4e40a4ce9fd9fe7859e24c] Merge tag 'docs-for-linus' of git://git.lwn.net/linux-2.6
git bisect good d6a24d0640d609138a4e40a4ce9fd9fe7859e24c
# bad: [396c9df2231865ef55aa031e3f5df9d99e036869] Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect bad 396c9df2231865ef55aa031e3f5df9d99e036869
# good: [7bdb11de8ee4f4ae195e2fa19efd304e0b36c63b] mnt: Factor out unhash_mnt from detach_mnt and umount_tree
git bisect good 7bdb11de8ee4f4ae195e2fa19efd304e0b36c63b
# good: [e0c9c0afd2fc958ffa34b697972721d81df8a56f] mnt: Update detach_mounts to leave mounts connected
git bisect good e0c9c0afd2fc958ffa34b697972721d81df8a56f
# bad: [8053871d0f7f67c7efb7f226ef031f78877d6625] smp: Fix smp_call_function_single_async() locking
git bisect bad 8053871d0f7f67c7efb7f226ef031f78877d6625
# good: [d7bc3197b41e0a1af6677e83f8736e93a1575ce0] lockdep: Make print_lock() robust against concurrent release
git bisect good d7bc3197b41e0a1af6677e83f8736e93a1575ce0
# first bad commit: [8053871d0f7f67c7efb7f226ef031f78877d6625] smp: Fix smp_call_function_single_async() locking

---
configuration:

# CONFIG_LOCALVERSION_AUTO is not set
CONFIG_SYSVIPC=y
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
CONFIG_LOG_BUF_SHIFT=14
CONFIG_CGROUPS=y
CONFIG_CPUSETS=y
# CONFIG_UTS_NS is not set
# CONFIG_IPC_NS is not set
# CONFIG_PID_NS is not set
# CONFIG_NET_NS is not set
CONFIG_BLK_DEV_INITRD=y
CONFIG_PROFILING=y
CONFIG_OPROFILE=y
CONFIG_MODULES=y
CONFIG_MODULE_UNLOAD=y
# CONFIG_LBDAF is not set
# CONFIG_BLK_DEV_BSG is not set
# CONFIG_IOSCHED_DEADLINE is not set
# CONFIG_IOSCHED_CFQ is not set
CONFIG_ARCH_VEXPRESS=y
CONFIG_ARCH_VEXPRESS_CA9X4=y
CONFIG_ARCH_VEXPRESS_DCSCB=y
CONFIG_ARCH_VEXPRESS_TC2_PM=y
CONFIG_SMP=y
CONFIG_HAVE_ARM_ARCH_TIMER=y
CONFIG_MCPM=y
CONFIG_VMSPLIT_2G=y
CONFIG_NR_CPUS=8
CONFIG_ARM_PSCI=y
CONFIG_AEABI=y
CONFIG_CMA=y
CONFIG_ZBOOT_ROM_TEXT=0x0
CONFIG_ZBOOT_ROM_BSS=0x0
CONFIG_CMDLINE="console=ttyAMA0"
CONFIG_CPU_IDLE=y
CONFIG_VFP=y
CONFIG_NEON=y
# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
CONFIG_NET=y
CONFIG_PACKET=y
CONFIG_UNIX=y
CONFIG_INET=y
CONFIG_IP_PNP=y
CONFIG_IP_PNP_DHCP=y
CONFIG_IP_PNP_BOOTP=y
# CONFIG_INET_LRO is not set
# CONFIG_IPV6 is not set
# CONFIG_WIRELESS is not set
CONFIG_NET_9P=y
CONFIG_NET_9P_VIRTIO=y
CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_MTD=y
CONFIG_MTD_CMDLINE_PARTS=y
CONFIG_MTD_BLOCK=y
CONFIG_MTD_CFI=y
CONFIG_MTD_CFI_INTELEXT=y
CONFIG_MTD_CFI_AMDSTD=y
CONFIG_MTD_PHYSMAP=y
CONFIG_MTD_PHYSMAP_OF=y
CONFIG_MTD_PLATRAM=y
CONFIG_MTD_UBI=y
CONFIG_VIRTIO_BLK=y
# CONFIG_SCSI_PROC_FS is not set
CONFIG_BLK_DEV_SD=y
CONFIG_SCSI_VIRTIO=y
CONFIG_ATA=y
# CONFIG_SATA_PMP is not set
CONFIG_NETDEVICES=y
CONFIG_VIRTIO_NET=y
CONFIG_SMC91X=y
CONFIG_SMSC911X=y
# CONFIG_WLAN is not set
CONFIG_INPUT_EVDEV=y
# CONFIG_SERIO_SERPORT is not set
CONFIG_SERIO_AMBAKMI=y
CONFIG_LEGACY_PTY_COUNT=16
CONFIG_SERIAL_AMBA_PL011=y
CONFIG_SERIAL_AMBA_PL011_CONSOLE=y
CONFIG_VIRTIO_CONSOLE=y
CONFIG_HW_RANDOM=y
CONFIG_HW_RANDOM_VIRTIO=y
CONFIG_I2C=y
CONFIG_I2C_VERSATILE=y
CONFIG_SENSORS_VEXPRESS=y
CONFIG_REGULATOR=y
CONFIG_REGULATOR_VEXPRESS=y
CONFIG_FB=y
CONFIG_FB_ARMCLCD=y
CONFIG_FRAMEBUFFER_CONSOLE=y
CONFIG_LOGO=y
# CONFIG_LOGO_LINUX_MONO is not set
# CONFIG_LOGO_LINUX_VGA16 is not set
CONFIG_SOUND=y
CONFIG_SND=y
CONFIG_SND_MIXER_OSS=y
CONFIG_SND_PCM_OSS=y
# CONFIG_SND_DRIVERS is not set
CONFIG_SND_ARMAACI=y
CONFIG_HID_DRAGONRISE=y
CONFIG_HID_GYRATION=y
CONFIG_HID_TWINHAN=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=y
CONFIG_USB_ANNOUNCE_NEW_DEVICES=y
CONFIG_USB_MON=y
CONFIG_USB_ISP1760_HCD=y
CONFIG_USB_STORAGE=y
CONFIG_MMC=y
CONFIG_MMC_ARMMMCI=y
CONFIG_NEW_LEDS=y
CONFIG_LEDS_CLASS=y
CONFIG_LEDS_GPIO=y
CONFIG_LEDS_TRIGGERS=y
CONFIG_LEDS_TRIGGER_HEARTBEAT=y
CONFIG_LEDS_TRIGGER_CPU=y
CONFIG_RTC_CLASS=y
CONFIG_RTC_DRV_PL031=y
CONFIG_VIRTIO_BALLOON=y
CONFIG_VIRTIO_MMIO=y
CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES=y
CONFIG_EXT2_FS=y
CONFIG_EXT3_FS=y
# CONFIG_EXT3_DEFAULTS_TO_ORDERED is not set
# CONFIG_EXT3_FS_XATTR is not set
CONFIG_EXT4_FS=y
CONFIG_VFAT_FS=y
CONFIG_TMPFS=y
CONFIG_JFFS2_FS=y
CONFIG_UBIFS_FS=y
CONFIG_CRAMFS=y
CONFIG_SQUASHFS=y
CONFIG_SQUASHFS_LZO=y
CONFIG_NFS_FS=y
CONFIG_ROOT_NFS=y
CONFIG_9P_FS=y
CONFIG_NLS_CODEPAGE_437=y
CONFIG_NLS_ISO8859_1=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_FS=y
CONFIG_MAGIC_SYSRQ=y
CONFIG_DEBUG_KERNEL=y
CONFIG_DETECT_HUNG_TASK=y
# CONFIG_SCHED_DEBUG is not set
CONFIG_DEBUG_USER=y
# CONFIG_CRYPTO_ANSI_CPRNG is not set
# CONFIG_CRYPTO_HW is not set

---
qemu command:

/opt/buildbot/bin/qemu-system-arm -M vexpress-a9 -kernel arch/arm/boot/zImage \
	-drive file=core-image-minimal-qemuarm.ext3,if=sd -no-reboot \
	-append "root=/dev/mmcblk0 rw console=ttyAMA0,115200 console=tty1" \
	-nographic -dtb arch/arm/boot/dts/vexpress-v2p-ca9.dtb

The root file system used in this test is available at
http://server.roeck-us.net/qemu/arm/core-image-minimal-qemuarm.ext3

---
Compiler:

poky 1.7, arm-poky-linux-gnueabi-gcc (GCC) 4.9.1

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