Buildresult: linus/sparc-allnoconfig/sparc64-gcc5 built on Jan 9 2016, 19:20

kisskb

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Status:	OK
Date/Time:	Jan 9 2016, 19:20
Duration:	0:00:12.240846
Builder:	p82
Revision:	vmstat: allocate vmstat_wq before it is used (`751e5f5c753e8d447bcf89f9e96b9616ac081628)`
Target:	linus/sparc-allnoconfig/sparc64-gcc5
Branch:	linus
Compiler:	sparc64-gcc5 (sparc64-linux-gcc (GCC) 4.6.3)
Config:	allnoconfig (download)
Log:	Download original No warnings found in log. Full Log # git rev-parse -q --verify 751e5f5c753e8d447bcf89f9e96b9616ac081628^{commit} 751e5f5c753e8d447bcf89f9e96b9616ac081628 already have revision, skipping fetch # git checkout -q -f -B kisskb 751e5f5c753e8d447bcf89f9e96b9616ac081628 # git clean -qxdf # git log -1 commit 751e5f5c753e8d447bcf89f9e96b9616ac081628 Author: Michal Hocko <mhocko@suse.com> Date: Fri Jan 8 11:18:29 2016 +0100 vmstat: allocate vmstat_wq before it is used kernel test robot has reported the following crash: BUG: unable to handle kernel NULL pointer dereference at 00000100 IP: [<c1074df6>] __queue_work+0x26/0x390 pdpt = 0000000000000000 pde = f000ff53f000ff53 *pde = f000ff53f000ff53 Oops: 0000 [#1] PREEMPT PREEMPT SMP SMP CPU: 0 PID: 24 Comm: kworker/0:1 Not tainted 4.4.0-rc4-00139-g373ccbe #1 Workqueue: events vmstat_shepherd task: cb684600 ti: cb7ba000 task.ti: cb7ba000 EIP: 0060:[<c1074df6>] EFLAGS: 00010046 CPU: 0 EIP is at __queue_work+0x26/0x390 EAX: 00000046 EBX: cbb37800 ECX: cbb37800 EDX: 00000000 ESI: 00000000 EDI: 00000000 EBP: cb7bbe68 ESP: cb7bbe38 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 CR0: 8005003b CR2: 00000100 CR3: 01fd5000 CR4: 000006b0 Stack: Call Trace: __queue_delayed_work+0xa1/0x160 queue_delayed_work_on+0x36/0x60 vmstat_shepherd+0xad/0xf0 process_one_work+0x1aa/0x4c0 worker_thread+0x41/0x440 kthread+0xb0/0xd0 ret_from_kernel_thread+0x21/0x40 The reason is that start_shepherd_timer schedules the shepherd work item which uses vmstat_wq (vmstat_shepherd) before setup_vmstat allocates that workqueue so if the further initialization takes more than HZ we might end up scheduling on a NULL vmstat_wq. This is really unlikely but not impossible. Fixes: 373ccbe59270 ("mm, vmstat: allow WQ concurrency to discover memory reclaim doesn't make any progress") Reported-by: kernel test robot <ying.huang@linux.intel.com> Signed-off-by: Michal Hocko <mhocko@suse.com> Tested-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Cc: stable@vger.kernel.org Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> # < /opt/cross/gcc-4.6.3-nolibc/sparc64-linux/bin/sparc64-linux-gcc --version # < git log --format=%s --max-count=1 751e5f5c753e8d447bcf89f9e96b9616ac081628 # < make -j 240 ARCH=sparc O=/home/kisskb/slave/build/linus_sparc-allnoconfig_sparc64 CROSS_COMPILE=/opt/cross/gcc-4.6.3-nolibc/sparc64-linux/bin/sparc64-linux- allnoconfig # make -j 240 ARCH=sparc O=/home/kisskb/slave/build/linus_sparc-allnoconfig_sparc64 CROSS_COMPILE=/opt/cross/gcc-4.6.3-nolibc/sparc64-linux/bin/sparc64-linux- make[1]: Entering directory `/home/kisskb/slave/build/linus_sparc-allnoconfig_sparc64' GEN ./Makefile scripts/kconfig/conf --silentoldconfig Kconfig make[1]: Leaving directory `/home/kisskb/slave/build/linus_sparc-allnoconfig_sparc64' make[1]: Entering directory `/home/kisskb/slave/build/linus_sparc-allnoconfig_sparc64' CHK include/config/kernel.release UPD include/config/kernel.release GEN ./Makefile WRAP arch/sparc/include/generated/asm/clkdev.h WRAP arch/sparc/include/generated/asm/cputime.h WRAP arch/sparc/include/generated/asm/div64.h WRAP arch/sparc/include/generated/asm/emergency-restart.h WRAP arch/sparc/include/generated/asm/exec.h WRAP arch/sparc/include/generated/asm/irq_regs.h WRAP arch/sparc/include/generated/asm/irq_work.h WRAP arch/sparc/include/generated/asm/linkage.h WRAP arch/sparc/include/generated/asm/local.h WRAP arch/sparc/include/generated/asm/local64.h WRAP arch/sparc/include/generated/asm/mcs_spinlock.h WRAP arch/sparc/include/generated/asm/mm-arch-hooks.h WRAP arch/sparc/include/generated/asm/module.h WRAP arch/sparc/include/generated/asm/mutex.h WRAP arch/sparc/include/generated/asm/preempt.h WRAP arch/sparc/include/generated/asm/serial.h WRAP arch/sparc/include/generated/asm/trace_clock.h WRAP arch/sparc/include/generated/asm/word-at-a-time.h WRAP arch/sparc/include/generated/asm/types.h CHK include/generated/uapi/linux/version.h UPD include/generated/uapi/linux/version.h CHK include/generated/utsrelease.h UPD include/generated/utsrelease.h Using /home/kisskb/slave/src as source for kernel CC scripts/mod/empty.o HOSTCC scripts/mod/mk_elfconfig CC scripts/mod/devicetable-offsets.s GEN scripts/mod/devicetable-offsets.h MKELF scripts/mod/elfconfig.h HOSTCC scripts/mod/modpost.o HOSTCC scripts/mod/file2alias.o HOSTCC scripts/mod/sumversion.o HOSTLD scripts/mod/modpost CHK include/generated/timeconst.h CC kernel/bounds.s UPD include/generated/timeconst.h CHK include/generated/bounds.h UPD include/generated/bounds.h CC arch/sparc/kernel/asm-offsets.s CHK include/generated/asm-offsets.h UPD include/generated/asm-offsets.h CALL /home/kisskb/slave/src/scripts/checksyscalls.sh CC init/main.o CHK include/generated/compile.h CC init/do_mounts.o CC init/noinitramfs.o CC init/calibrate.o CC init/init_task.o LD usr/built-in.o UPD include/generated/compile.h CC init/version.o CC arch/sparc/math-emu/math_32.o LD arch/sparc/net/built-in.o LD arch/sparc/crypto/built-in.o CC arch/sparc/mm/fault_32.o CC arch/sparc/mm/init_32.o CC arch/sparc/mm/extable.o CC arch/sparc/mm/srmmu.o CC arch/sparc/mm/iommu.o CC arch/sparc/mm/io-unit.o AS arch/sparc/mm/srmmu_access.o AS arch/sparc/mm/hypersparc.o AS arch/sparc/mm/viking.o AS arch/sparc/mm/tsunami.o AS arch/sparc/mm/swift.o CC arch/sparc/mm/leon_mm.o CC arch/sparc/mm/highmem.o AS arch/sparc/kernel/entry.o AS arch/sparc/kernel/wof.o AS arch/sparc/kernel/wuf.o AS arch/sparc/kernel/etrap_32.o AS arch/sparc/kernel/rtrap_32.o CC arch/sparc/kernel/traps_32.o CC arch/sparc/kernel/irq_32.o CC arch/sparc/kernel/sun4m_irq.o CC arch/sparc/kernel/sun4d_irq.o CC arch/sparc/kernel/process_32.o CC arch/sparc/kernel/signal_32.o CC arch/sparc/kernel/sigutil_32.o CC kernel/fork.o CC kernel/panic.o CC arch/sparc/kernel/ioport.o CC arch/sparc/kernel/setup_32.o CC kernel/cpu.o CC kernel/exec_domain.o CC kernel/exit.o CC arch/sparc/kernel/idprom.o AS arch/sparc/kernel/systbls_32.o CC kernel/resource.o CC kernel/softirq.o CC arch/sparc/kernel/windows.o CC arch/sparc/kernel/time_32.o CC arch/sparc/kernel/sys_sparc_32.o CC arch/sparc/kernel/cpu.o CC kernel/sysctl.o CC arch/sparc/kernel/devices.o CC kernel/sysctl_binary.o CC arch/sparc/kernel/ptrace_32.o CC kernel/capability.o CC arch/sparc/kernel/unaligned_32.o AS arch/sparc/kernel/una_asm_32.o CC arch/sparc/kernel/prom_32.o CC kernel/user.o CC arch/sparc/kernel/prom_common.o CC kernel/ptrace.o CC kernel/signal.o CC arch/sparc/kernel/of_device_common.o CC kernel/sys.o CC kernel/kmod.o CC kernel/workqueue.o CC kernel/pid.o CC arch/sparc/kernel/of_device_32.o CC kernel/task_work.o CC arch/sparc/kernel/leon_kernel.o CC kernel/extable.o CC kernel/params.o CC arch/sparc/kernel/leon_pmc.o CC arch/sparc/kernel/dma.o CC arch/sparc/kernel/auxio_32.o CC kernel/kthread.o CC kernel/sys_ni.o CC arch/sparc/kernel/apc.o CC kernel/nsproxy.o CC arch/sparc/kernel/pmc.o AS arch/sparc/kernel/head_32.o LDS arch/sparc/kernel/vmlinux.lds CC kernel/notifier.o CC kernel/ksysfs.o CC kernel/cred.o CC kernel/reboot.o CC kernel/async.o CC kernel/range.o CC kernel/smpboot.o LD kernel/livepatch/built-in.o CC kernel/irq/irqdesc.o CC kernel/irq/handle.o CC kernel/dma.o CC kernel/power/qos.o CC kernel/up.o CC kernel/irq/manage.o CC kernel/printk/printk.o CC kernel/memremap.o CC kernel/locking/mutex.o CC kernel/irq/spurious.o CC kernel/locking/semaphore.o CC kernel/irq/resend.o CC kernel/locking/rwsem.o CC kernel/locking/percpu-rwsem.o CC kernel/irq/chip.o CC kernel/rcu/sync.o CC kernel/locking/rwsem-spinlock.o CC kernel/irq/dummychip.o CC kernel/rcu/update.o CC kernel/rcu/tiny.o CC kernel/irq/devres.o LD certs/built-in.o CC kernel/sched/core.o CC kernel/sched/loadavg.o CC kernel/sched/clock.o CC kernel/sched/cputime.o CC kernel/sched/idle_task.o CC kernel/time/time.o CC kernel/sched/fair.o CC kernel/time/timer.o CC kernel/sched/rt.o CC kernel/time/hrtimer.o CC kernel/time/itimer.o CC kernel/sched/deadline.o CC kernel/time/posix-timers.o CC kernel/time/posix-cpu-timers.o CC kernel/time/timekeeping.o CC kernel/sched/stop_task.o CC kernel/time/ntp.o CC kernel/sched/wait.o CC kernel/time/clocksource.o CC kernel/time/jiffies.o CC kernel/time/timer_list.o CC kernel/sched/completion.o CC kernel/time/timeconv.o CC kernel/sched/idle.o CC kernel/time/timecounter.o CC kernel/time/posix-clock.o CC kernel/time/alarmtimer.o CC kernel/time/clockevents.o CC kernel/time/tick-common.o CC mm/filemap.o LD ipc/built-in.o CC fs/open.o CC mm/mempool.o CC fs/read_write.o CC mm/oom_kill.o CC fs/file_table.o CC mm/maccess.o CC fs/super.o CC mm/page_alloc.o CC fs/char_dev.o CC mm/page-writeback.o CC fs/stat.o CC mm/readahead.o CC fs/exec.o CC mm/swap.o CC security/commoncap.o CC fs/pipe.o CC fs/namei.o CC mm/truncate.o CC fs/fcntl.o CC mm/vmscan.o CC security/min_addr.o CC fs/ioctl.o CC mm/shmem.o CC fs/readdir.o CC fs/select.o CC fs/dcache.o CC mm/util.o CC fs/inode.o CC fs/attr.o CC mm/mmzone.o CC fs/bad_inode.o CC mm/vmstat.o CC fs/file.o CC mm/backing-dev.o CC fs/filesystems.o CC fs/namespace.o CC fs/seq_file.o CC mm/mm_init.o CC mm/mmu_context.o LD crypto/built-in.o CC fs/xattr.o CC mm/percpu.o CC fs/libfs.o CC fs/fs-writeback.o CC fs/pnode.o CC mm/slab_common.o CC fs/splice.o CC mm/compaction.o CC fs/sync.o CC fs/utimes.o CC mm/vmacache.o CC fs/stack.o CC mm/interval_tree.o CC mm/list_lru.o CC mm/workingset.o CC fs/fs_struct.o CC mm/debug.o CC fs/statfs.o CC mm/gup.o CC fs/fs_pin.o CC mm/highmem.o CC fs/nsfs.o CC mm/memory.o LD block/built-in.o CC fs/no-block.o CC mm/mincore.o CC mm/mlock.o LD fs/devpts/built-in.o LD fs/exofs/built-in.o CC mm/mmap.o CC mm/mprotect.o LD fs/quota/built-in.o CC mm/mremap.o CC mm/msync.o CC mm/rmap.o CC fs/ramfs/inode.o LD init/mounts.o LD init/built-in.o CC mm/vmalloc.o CC fs/ramfs/file-mmu.o CC mm/pagewalk.o LD kernel/rcu/built-in.o CC mm/pgtable-generic.o LD fs/notify/dnotify/built-in.o LD fs/notify/fanotify/built-in.o LD fs/notify/inotify/built-in.o LD kernel/locking/built-in.o CC mm/init-mm.o CC mm/bootmem.o LD fs/notify/built-in.o CC mm/dmapool.o CC mm/slub.o LD sound/built-in.o LD firmware/built-in.o LD arch/sparc/kernel/built-in.o LD net/built-in.o LD drivers/amba/built-in.o LD drivers/auxdisplay/built-in.o LD drivers/bus/built-in.o LD drivers/cdrom/built-in.o LD drivers/block/built-in.o LD kernel/power/built-in.o LD drivers/clocksource/built-in.o LD drivers/gpio/built-in.o LD drivers/firewire/built-in.o LD drivers/clk/bcm/built-in.o CC drivers/char/mem.o LD drivers/clk/built-in.o CC drivers/char/random.o LD drivers/hwtracing/intel_th/built-in.o CC drivers/char/misc.o LD drivers/char/agp/built-in.o LD drivers/idle/built-in.o LD drivers/leds/built-in.o LD kernel/printk/built-in.o LD drivers/irqchip/built-in.o LD drivers/gpu/vga/built-in.o LD drivers/firmware/broadcom/built-in.o LD drivers/lguest/built-in.o LD drivers/hsi/clients/built-in.o LD drivers/i2c/algos/built-in.o LD drivers/i2c/busses/built-in.o LD drivers/hsi/controllers/built-in.o LD drivers/macintosh/built-in.o LD drivers/mfd/built-in.o CC drivers/base/component.o LD drivers/i2c/muxes/built-in.o LD drivers/firmware/built-in.o CC drivers/base/core.o LD drivers/mmc/built-in.o CC drivers/base/bus.o LD drivers/net/built-in.o LD drivers/i2c/built-in.o CC drivers/base/dd.o LD drivers/hsi/built-in.o LD arch/sparc/mm/built-in.o LD drivers/pwm/built-in.o LD drivers/nfc/built-in.o CC drivers/of/base.o LD drivers/platform/built-in.o LD drivers/soc/built-in.o LD drivers/nvme/host/built-in.o LD drivers/gpu/drm/i2c/built-in.o LD arch/sparc/prom/built-in.o CC drivers/of/device.o CC drivers/base/syscore.o CC drivers/of/platform.o CC arch/sparc/prom/bootstr_32.o LD drivers/gpu/drm/panel/built-in.o CC drivers/base/driver.o LD drivers/nvme/built-in.o LD drivers/gpu/drm/bridge/built-in.o CC drivers/of/pdt.o CC drivers/base/class.o CC arch/sparc/prom/init_32.o CC arch/sparc/prom/console_32.o LD drivers/sbus/char/built-in.o CC drivers/rtc/rtc-lib.o CC arch/sparc/prom/memory.o LD drivers/sbus/built-in.o CC drivers/base/platform.o LD drivers/gpu/drm/tilcdc/built-in.o CC arch/sparc/prom/misc_32.o CC drivers/rtc/systohc.o CC arch/sparc/prom/mp.o LD drivers/tty/serial/built-in.o LD drivers/media/firewire/built-in.o CC drivers/base/cpu.o LD drivers/tty/ipwireless/built-in.o LD drivers/misc/eeprom/built-in.o LD drivers/tty/vt/built-in.o LD drivers/misc/cb710/built-in.o LD drivers/misc/lis3lv02d/built-in.o CC arch/sparc/prom/printf.o CC drivers/base/firmware.o CC drivers/rtc/class.o CC arch/sparc/prom/ranges.o LD drivers/gpu/drm/built-in.o CC drivers/base/init.o LD drivers/video/backlight/built-in.o CC drivers/rtc/interface.o LD drivers/misc/mic/bus/built-in.o CC drivers/base/map.o CC arch/sparc/prom/tree_32.o LD drivers/misc/ti-st/built-in.o CC drivers/base/devres.o LD drivers/media/platform/omap/built-in.o CC drivers/rtc/rtc-m48t59.o LD drivers/media/mmc/siano/built-in.o LD drivers/media/i2c/soc_camera/built-in.o CC drivers/base/attribute_container.o LD drivers/tty/built-in.o CC drivers/base/transport_class.o LD drivers/media/tuners/built-in.o CC arch/sparc/lib/atomic32.o CC drivers/base/topology.o CC arch/sparc/lib/ucmpdi2.o LD drivers/media/i2c/built-in.o LD drivers/misc/mic/built-in.o CC arch/sparc/lib/ksyms.o LD drivers/media/platform/built-in.o AS arch/sparc/lib/ashldi3.o LD drivers/gpu/built-in.o AS arch/sparc/lib/ashrdi3.o LD drivers/media/rc/keymaps/built-in.o LD kernel/irq/built-in.o LD drivers/media/mmc/built-in.o CC arch/sparc/lib/bitext.o AS arch/sparc/lib/blockops.o CC drivers/base/container.o AS arch/sparc/lib/checksum_32.o CC arch/sparc/lib/cmpdi2.o LD drivers/misc/built-in.o LD drivers/media/common/b2c2/built-in.o LD drivers/media/common/saa7146/built-in.o AS arch/sparc/lib/copy_user.o AS arch/sparc/lib/divdi3.o AS arch/sparc/lib/locks.o AS arch/sparc/lib/lshrdi3.o LD drivers/media/common/siano/built-in.o LD drivers/media/rc/built-in.o AS arch/sparc/lib/memcmp.o CC drivers/base/property.o AS arch/sparc/lib/memcpy.o CC drivers/video/fbdev/core/fb_notify.o LD drivers/media/common/built-in.o CC lib/lockref.o AS arch/sparc/lib/memset.o AS arch/sparc/lib/memscan_32.o CC drivers/base/cacheinfo.o CC lib/bcd.o CC lib/div64.o AS arch/sparc/lib/muldi3.o CC drivers/base/dma-mapping.o CC lib/sort.o CC lib/parser.o AS arch/sparc/lib/strlen.o LD drivers/base/power/built-in.o AS arch/sparc/lib/udivdi3.o LD drivers/media/usb/b2c2/built-in.o AS arch/sparc/lib/strncmp_32.o LD drivers/media/usb/dvb-usb/built-in.o LD drivers/media/pci/b2c2/built-in.o CC lib/halfmd4.o LD fs/ramfs/ramfs.o LD drivers/media/pci/ddbridge/built-in.o LD drivers/video/fbdev/omap2/displays-new/built-in.o CC lib/debug_locks.o LD drivers/media/pci/dm1105/built-in.o LD drivers/media/usb/dvb-usb-v2/built-in.o LD fs/ramfs/built-in.o LD drivers/video/fbdev/omap2/dss/built-in.o LD drivers/media/pci/mantis/built-in.o LD drivers/media/pci/netup_unidvb/built-in.o CC lib/random32.o LD drivers/media/usb/stkwebcam/built-in.o LD drivers/media/usb/s2255/built-in.o LD drivers/video/fbdev/omap2/built-in.o CC lib/bust_spinlocks.o LD drivers/media/usb/siano/built-in.o LD drivers/media/usb/ttusb-budget/built-in.o CC lib/kasprintf.o LD drivers/media/usb/ttusb-dec/built-in.o LD drivers/media/pci/pluto2/built-in.o CC lib/scatterlist.o LD drivers/media/pci/ngene/built-in.o LD drivers/media/usb/zr364xx/built-in.o LD drivers/media/pci/pt3/built-in.o LD drivers/media/pci/pt1/built-in.o CC lib/lcm.o CC lib/bitmap.o LD drivers/media/pci/saa7146/built-in.o LD drivers/media/usb/built-in.o LD drivers/media/pci/smipcie/built-in.o CC lib/list_sort.o CC lib/gcd.o LD drivers/media/pci/ttpci/built-in.o CC lib/uuid.o CC lib/flex_array.o CC lib/iov_iter.o CC lib/clz_ctz.o CC lib/bsearch.o LD drivers/media/pci/built-in.o CC lib/find_bit.o CC lib/llist.o CC lib/memweight.o LD virt/lib/built-in.o LD virt/built-in.o CC lib/kfifo.o CC lib/percpu-refcount.o CC lib/percpu_ida.o AR arch/sparc/lib/lib.a CC lib/rhashtable.o CC lib/reciprocal_div.o LD drivers/media/built-in.o CC lib/once.o CC lib/string_helpers.o CC lib/hexdump.o CC lib/kstrtox.o LD arch/sparc/lib/built-in.o CC lib/pci_iomap.o CC lib/iomap_copy.o LD security/built-in.o CC lib/devres.o CC lib/hweight.o CC lib/syscall.o CC lib/atomic64.o CC lib/clz_tab.o CC lib/strncpy_from_user.o CC lib/strnlen_user.o CC lib/argv_split.o CC lib/cmdline.o CC lib/ctype.o CC lib/dec_and_lock.o CC lib/decompress.o CC lib/dump_stack.o CC lib/earlycpio.o CC lib/extable.o CC lib/flex_proportions.o CC lib/idr.o CC lib/int_sqrt.o CC lib/ioremap.o CC lib/irq_regs.o CC lib/is_single_threaded.o LD drivers/video/fbdev/core/built-in.o CC lib/klist.o LD drivers/video/fbdev/built-in.o CC lib/kobject.o CC lib/md5.o CC lib/kobject_uevent.o CC lib/nmi_backtrace.o LD drivers/video/built-in.o CC lib/plist.o CC lib/proportions.o CC lib/radix-tree.o CC lib/ratelimit.o CC lib/rbtree.o CC lib/seq_buf.o CC lib/sha1.o AR arch/sparc/prom/lib.a CC lib/show_mem.o CC lib/string.o CC lib/timerqueue.o CC lib/vsprintf.o LD kernel/time/built-in.o LD drivers/rtc/rtc-core.o LD drivers/rtc/built-in.o LD drivers/char/built-in.o LD kernel/sched/built-in.o LD drivers/of/built-in.o LD kernel/built-in.o LD drivers/base/built-in.o LD drivers/built-in.o LD lib/built-in.o LD fs/built-in.o LD mm/built-in.o AR lib/lib.a LD arch/sparc/math-emu/built-in.o LD arch/sparc/built-in.o LINK vmlinux LD vmlinux.o MODPOST vmlinux.o GEN .version CHK include/generated/compile.h UPD include/generated/compile.h CC init/version.o LD init/built-in.o LD vmlinux SYSMAP System.map STRIP arch/sparc/boot/image kernel: arch/sparc/boot/image is ready STRIP arch/sparc/boot/zImage kernel: arch/sparc/boot/zImage is ready make[1]: Leaving directory `/home/kisskb/slave/build/linus_sparc-allnoconfig_sparc64' Completed OK # rm -rf /home/kisskb/slave/build/linus_sparc-allnoconfig_sparc64 # Build took: 0:00:12.240846

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