Re: linux-next: Tree for Feb 4

Sedat Dilek
2015-02-05T19:42:59Z

On Thu, Feb 5, 2015 at 8:33 PM, Paul E. McKenney
<paulmck@linux.vnet.ibm.com> wrote:
> On Thu, Feb 05, 2015 at 08:25:21PM +0100, Sedat Dilek wrote:
>> On Thu, Feb 5, 2015 at 7:45 PM, Paul E. McKenney
>> <paulmck@linux.vnet.ibm.com> wrote:
>> > On Thu, Feb 05, 2015 at 10:35:33AM -0800, Dave Hansen wrote:
>> >> On 02/05/2015 10:34 AM, Paul E. McKenney wrote:
>> >> >> > Did I actually need to be
>> >> >> > onlining/offlining CPUs to hit the splat that Sedat was reporting?
>> >> > Yep, you do need to offline at least one CPU to hit that splat.
>> >>
>> >> Heh, do we need a debugging mode that will randomly offline/online CPUs? :)
>> >
>> > For that, kernel/rcu/rcutorture.c and kernel/locking/locktorture.c
>> > are your friends. ;-)
>> >
>> > The problem is that I only run RCU-relevant combinations of Kconfigs,
>> > which means that I missed the ones that Sedat used to find this problem.
>> > So I guess it is a good thing that others run -next testing.
>> >
>>
>> [ Revived by a voltaren resinat pill... ]
>>
>> I reverted "x86/mm: Omit switch_mm() tracing for offline CPUs"
>> ...and...
>> applied "tlb: Don't do trace_tlb_flush() on offline CPUs"
>> ...in my build-dir.
>> ( I did not build from scratch but re-invoking make "updated" the
>> files touched by Steven's patch, see attached build-log. )
>>
>> Unfortunately, the call-trace remains when doing an offlining of cpu1.
>> ( It's good to see it's reproducible. )
>>
>> root# echo 0 > /sys/devices/system/cpu/cpu1/online
>>
>> [ 121.652796] intel_pstate CPU 1 exiting
>> [ 121.666272]
>> [ 121.666274] ===============================
>> [ 121.666274] [ INFO: suspicious RCU usage. ]
>> [ 121.666277] 3.19.0-rc7-next-20150204.7-iniza-small #4 Not tainted
>> [ 121.666278] -------------------------------
>> [ 121.666280] include/trace/events/tlb.h:37 suspicious
>> rcu_dereference_check() usage!
>> [ 121.666281]
>> [ 121.666281] other info that might help us debug this:
>> [ 121.666281]
>> [ 121.666282]
>> [ 121.666282] RCU used illegally from offline CPU!
>> [ 121.666282] rcu_scheduler_active = 1, debug_locks = 0
>> [ 121.666283] no locks held by swapper/1/0.
>> [ 121.666284]
>> [ 121.666284] stack backtrace:
>> [ 121.666287] CPU: 1 PID: 0 Comm: swapper/1 Not tainted
>> 3.19.0-rc7-next-20150204.7-iniza-small #4
>> [ 121.666288] Hardware name: SAMSUNG ELECTRONICS CO., LTD.
>> 530U3BI/530U4BI/530U4BH/530U3BI/530U4BI/530U4BH, BIOS 13XK 03/28/2013
>> [ 121.666293] 0000000000000001 ffff88011a44fe18 ffffffff817e39cd
>> 0000000000000011
>> [ 121.666296] ffff88011a448290 ffff88011a44fe48 ffffffff810d6af7
>> ffff8800d3dfaac0
>> [ 121.666299] 0000000000000001 ffffffff81d32ce0 0000000000000005
>> ffff88011a44fe78
>> [ 121.666300] Call Trace:
>> [ 121.666308] [<ffffffff817e39cd>] dump_stack+0x4c/0x65
>> [ 121.666313] [<ffffffff810d6af7>] lockdep_rcu_suspicious+0xe7/0x120
>> [ 121.666318] [<ffffffff810b73f9>] idle_task_exit+0x1c9/0x260
>> [ 121.666322] [<ffffffff81054c4e>] play_dead_common+0xe/0x50
>> [ 121.666325] [<ffffffff81054ca5>] native_play_dead+0x15/0x140
>> [ 121.666330] [<ffffffff8102963f>] arch_cpu_idle_dead+0xf/0x20
>> [ 121.666333] [<ffffffff810cdb4e>] cpu_startup_entry+0x37e/0x580
>> [ 121.666336] [<ffffffff81053e20>] start_secondary+0x140/0x150
>> [ 121.666744] smpboot: CPU 1 is now offline
>>
>> >From rcu point this is now safe?
>> But another area (linux-pm?) is still affected?
>> I will try to test "vanilla" pm-next if the problem exists with
>> intel_pstate as suggested by Rafael.
>> Hmmm, not sure how I can get the pm-next code which went into
>> next-20150204 as linux-pm.git#linux-next was feeded with new stuff.
>
> At this point, I am starting to think in terms of moving the new
> CPU_DYING_IDLE notification later in the offline sequence. This will
> take me a bit to get set up correctly, but I hope to have a patch
> some time tomorrow (Friday), Pacific time.
>

Is "CPU_DYING_IDLE (notification)" rcu area?

Shall I do a pm-next testing?

By looking at [1] I got the commit-id/sha1 which went into next-20150204.

n102: pm 12f24f2d78ce801c9330c5f682b7beb215bdbab1

If this helps you I will do.

"For Paul" :-)
- Sedat -

[1] http://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/Next/SHA1s?id=next-20150204#n102
[2] http://git.kernel.org/cgit/linux/kernel/git/rafael/linux-pm.git/commit/?h=linux-next&id=12f24f2d78ce801c9330c5f682b7beb215bdbab1

> Thanx, Paul
>
>> - Sedat -
>
>> CHK include/config/kernel.release
>> make KBUILD_SRC=
>> CHK include/config/kernel.release
>> CHK include/generated/uapi/linux/version.h
>> CHK include/generated/utsrelease.h
>> CALL scripts/checksyscalls.sh
>> CHK include/generated/compile.h
>> CC arch/x86/mm/init.o
>> CC arch/x86/mm/init_64.o
>> CC mm/mmu_context.o
>> CC kernel/fork.o
>> CC arch/x86/kernel/process_64.o
>> CC mm/mmap.o
>> CC arch/x86/kernel/ldt.o
>> CC arch/x86/mm/tlb.o
>> CC arch/x86/kernel/setup.o
>> LD arch/x86/mm/built-in.o
>> CC kernel/exit.o
>> LD mm/built-in.o
>> CC arch/x86/xen/mmu.o
>> CC arch/x86/kernel/apic/ipi.o
>> CC fs/exec.o
>> LD arch/x86/kernel/apic/built-in.o
>> CC kernel/power/snapshot.o
>> CC arch/x86/kernel/cpu/common.o
>> LD kernel/power/built-in.o
>> LD arch/x86/xen/built-in.o
>> CC kernel/sched/core.o
>> LD arch/x86/kernel/cpu/built-in.o
>> CC arch/x86/kernel/smp.o
>> CC arch/x86/kernel/machine_kexec_64.o
>> LD arch/x86/kernel/built-in.o
>> LD arch/x86/built-in.o
>> LD kernel/sched/built-in.o
>> CC kernel/module.o
>> CC fs/compat.o
>> CHK kernel/config_data.h
>> LD kernel/built-in.o
>> CC fs/coredump.o
>> LD fs/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
>> KSYM .tmp_kallsyms1.o
>> KSYM .tmp_kallsyms2.o
>> LD vmlinux
>> SORTEX vmlinux
>> SYSMAP System.map
>> Building modules, stage 2.
>> VOFFSET arch/x86/boot/voffset.h
>> CC arch/x86/boot/version.o
>> MODPOST 115 modules
>> OBJCOPY arch/x86/boot/compressed/vmlinux.bin
>> XZKERN arch/x86/boot/compressed/vmlinux.bin.xz
>> MKPIGGY arch/x86/boot/compressed/piggy.S
>> AS arch/x86/boot/compressed/piggy.o
>> LD arch/x86/boot/compressed/vmlinux
>> ZOFFSET arch/x86/boot/zoffset.h
>> OBJCOPY arch/x86/boot/vmlinux.bin
>> AS arch/x86/boot/header.o
>> LD arch/x86/boot/setup.elf
>> OBJCOPY arch/x86/boot/setup.bin
>> BUILD arch/x86/boot/bzImage
>> Setup is 17036 bytes (padded to 17408 bytes).
>> System is 4437 kB
>> CRC 20f24227
>> Kernel: arch/x86/boot/bzImage is ready (#4)
>> BUILDDEB
>> make[2]: warning: jobserver unavailable: using -j1. Add `+' to parent make rule.
>> INSTALL crypto/arc4.ko
>> INSTALL crypto/ccm.ko
>> INSTALL crypto/cmac.ko
>> INSTALL crypto/ctr.ko
>> INSTALL crypto/lz4.ko
>> INSTALL crypto/lz4hc.ko
>> INSTALL crypto/seqiv.ko
>> INSTALL crypto/xor.ko
>> INSTALL drivers/acpi/video.ko
>> INSTALL drivers/bluetooth/btusb.ko
>> INSTALL drivers/char/lp.ko
>> INSTALL drivers/char/ppdev.ko
>> INSTALL drivers/gpu/drm/drm.ko
>> INSTALL drivers/gpu/drm/drm_kms_helper.ko
>> INSTALL drivers/gpu/drm/i915/i915.ko
>> INSTALL drivers/hid/hid-generic.ko
>> INSTALL drivers/hid/hid.ko
>> INSTALL drivers/hid/usbhid/usbhid.ko
>> INSTALL drivers/hid/usbhid/usbkbd.ko
>> INSTALL drivers/hid/usbhid/usbmouse.ko
>> INSTALL drivers/i2c/algos/i2c-algo-bit.ko
>> INSTALL drivers/i2c/i2c-mux.ko
>> INSTALL drivers/input/joydev.ko
>> INSTALL drivers/input/mouse/psmouse.ko
>> INSTALL drivers/input/serio/serio_raw.ko
>> INSTALL drivers/macintosh/mac_hid.ko
>> INSTALL drivers/media/dvb-core/dvb-core.ko
>> INSTALL drivers/media/i2c/ir-kbd-i2c.ko
>> INSTALL drivers/media/rc/rc-core.ko
>> INSTALL drivers/media/tuners/mc44s803.ko
>> INSTALL drivers/media/tuners/mt20xx.ko
>> INSTALL drivers/media/tuners/tda18271.ko
>> INSTALL drivers/media/tuners/tda827x.ko
>> INSTALL drivers/media/tuners/tda8290.ko
>> INSTALL drivers/media/tuners/tda9887.ko
>> INSTALL drivers/media/tuners/tea5761.ko
>> INSTALL drivers/media/tuners/tea5767.ko
>> INSTALL drivers/media/tuners/tuner-simple.ko
>> INSTALL drivers/media/tuners/tuner-types.ko
>> INSTALL drivers/media/tuners/tuner-xc2028.ko
>> INSTALL drivers/media/tuners/xc4000.ko
>> INSTALL drivers/media/tuners/xc5000.ko
>> INSTALL drivers/media/usb/uvc/uvcvideo.ko
>> INSTALL drivers/media/v4l2-core/v4l2-common.ko
>> INSTALL drivers/media/v4l2-core/v4l2-dv-timings.ko
>> INSTALL drivers/media/v4l2-core/videobuf2-core.ko
>> INSTALL drivers/media/v4l2-core/videobuf2-memops.ko
>> INSTALL drivers/media/v4l2-core/videobuf2-vmalloc.ko
>> INSTALL drivers/media/v4l2-core/videodev.ko
>> INSTALL drivers/mfd/lpc_ich.ko
>> INSTALL drivers/mmc/card/mmc_block.ko
>> INSTALL drivers/mmc/host/sdhci.ko
>> INSTALL drivers/net/ethernet/realtek/r8169.ko
>> INSTALL drivers/net/mii.ko
>> INSTALL drivers/net/ppp/bsd_comp.ko
>> INSTALL drivers/net/ppp/ppp_async.ko
>> INSTALL drivers/net/ppp/ppp_deflate.ko
>> INSTALL drivers/net/usb/cdc_ether.ko
>> INSTALL drivers/net/usb/usbnet.ko
>> INSTALL drivers/net/wireless/iwlwifi/dvm/iwldvm.ko
>> INSTALL drivers/net/wireless/iwlwifi/iwlwifi.ko
>> INSTALL drivers/parport/parport.ko
>> INSTALL drivers/parport/parport_pc.ko
>> INSTALL drivers/platform/x86/intel-rst.ko
>> INSTALL drivers/platform/x86/samsung-laptop.ko
>> INSTALL drivers/platform/x86/wmi.ko
>> INSTALL drivers/usb/class/usblp.ko
>> INSTALL drivers/usb/serial/option.ko
>> INSTALL drivers/usb/serial/usb_wwan.ko
>> INSTALL drivers/usb/serial/usbserial.ko
>> INSTALL drivers/usb/storage/usb-storage.ko
>> INSTALL drivers/xen/tmem.ko
>> INSTALL drivers/xen/xen-privcmd.ko
>> INSTALL fs/binfmt_misc.ko
>> INSTALL fs/btrfs/btrfs.ko
>> INSTALL fs/isofs/isofs.ko
>> INSTALL fs/nls/nls_iso8859-1.ko
>> INSTALL fs/ntfs/ntfs.ko
>> INSTALL fs/overlayfs/overlay.ko
>> INSTALL fs/squashfs/squashfs.ko
>> INSTALL fs/udf/udf.ko
>> INSTALL fs/xfs/xfs.ko
>> INSTALL kernel/configs.ko
>> INSTALL lib/crc-ccitt.ko
>> INSTALL lib/crc-itu-t.ko
>> INSTALL lib/libcrc32c.ko
>> INSTALL lib/lz4/lz4_compress.ko
>> INSTALL lib/lz4/lz4hc_compress.ko
>> INSTALL lib/raid6/raid6_pq.ko
>> INSTALL net/bluetooth/bluetooth.ko
>> INSTALL net/bluetooth/bnep/bnep.ko
>> INSTALL net/bluetooth/rfcomm/rfcomm.ko
>> INSTALL net/mac80211/mac80211.ko
>> INSTALL net/sched/sch_codel.ko
>> INSTALL net/sched/sch_fq_codel.ko
>> INSTALL net/sched/sch_htb.ko
>> INSTALL net/wireless/cfg80211.ko
>> INSTALL sound/core/seq/snd-seq-device.ko
>> INSTALL sound/core/seq/snd-seq-midi-event.ko
>> INSTALL sound/core/seq/snd-seq-midi.ko
>> INSTALL sound/core/seq/snd-seq-virmidi.ko
>> INSTALL sound/core/seq/snd-seq.ko
>> INSTALL sound/core/snd-hwdep.ko
>> INSTALL sound/core/snd-pcm.ko
>> INSTALL sound/core/snd-rawmidi.ko
>> INSTALL sound/core/snd-timer.ko
>> INSTALL sound/core/snd.ko
>> INSTALL sound/drivers/snd-virmidi.ko
>> INSTALL sound/pci/hda/snd-hda-codec-generic.ko
>> INSTALL sound/pci/hda/snd-hda-codec-hdmi.ko
>> INSTALL sound/pci/hda/snd-hda-codec-realtek.ko
>> INSTALL sound/pci/hda/snd-hda-codec.ko
>> INSTALL sound/pci/hda/snd-hda-controller.ko
>> INSTALL sound/pci/hda/snd-hda-intel.ko
>> INSTALL sound/soundcore.ko
>> DEPMOD 3.19.0-rc7-next-20150204.7-iniza-small
>> make[2]: warning: jobserver unavailable: using -j1. Add `+' to parent make rule.
>> CHK include/generated/uapi/linux/version.h
>> make[2]: warning: jobserver unavailable: using -j1. Add `+' to parent make rule.
>> CHK include/generated/uapi/linux/version.h
>> INSTALL debian/headertmp/usr/include/asm-generic/ (35 files)
>> INSTALL debian/headertmp/usr/include/drm/ (18 files)
>> INSTALL debian/headertmp/usr/include/linux/android/ (1 file)
>> INSTALL debian/headertmp/usr/include/linux/byteorder/ (2 files)
>> INSTALL debian/headertmp/usr/include/linux/caif/ (2 files)
>> INSTALL debian/headertmp/usr/include/linux/can/ (5 files)
>> INSTALL debian/headertmp/usr/include/linux/dvb/ (8 files)
>> INSTALL debian/headertmp/usr/include/linux/hdlc/ (1 file)
>> INSTALL debian/headertmp/usr/include/linux/hsi/ (1 file)
>> INSTALL debian/headertmp/usr/include/linux/isdn/ (1 file)
>> INSTALL debian/headertmp/usr/include/linux/mmc/ (1 file)
>> INSTALL debian/headertmp/usr/include/linux/netfilter/ipset/ (4 files)
>> INSTALL debian/headertmp/usr/include/linux/netfilter/ (85 files)
>> INSTALL debian/headertmp/usr/include/linux/netfilter_arp/ (2 files)
>> INSTALL debian/headertmp/usr/include/linux/netfilter_bridge/ (17 files)
>> INSTALL debian/headertmp/usr/include/linux/netfilter_ipv4/ (9 files)
>> INSTALL debian/headertmp/usr/include/linux/netfilter_ipv6/ (12 files)
>> INSTALL debian/headertmp/usr/include/linux/nfsd/ (5 files)
>> INSTALL debian/headertmp/usr/include/linux/raid/ (2 files)
>> INSTALL debian/headertmp/usr/include/linux/spi/ (1 file)
>> INSTALL debian/headertmp/usr/include/linux/sunrpc/ (1 file)
>> INSTALL debian/headertmp/usr/include/linux/tc_act/ (10 files)
>> INSTALL debian/headertmp/usr/include/linux/tc_ematch/ (4 files)
>> INSTALL debian/headertmp/usr/include/linux/usb/ (11 files)
>> INSTALL debian/headertmp/usr/include/linux/wimax/ (1 file)
>> INSTALL debian/headertmp/usr/include/linux/ (412 files)
>> INSTALL debian/headertmp/usr/include/misc/ (1 file)
>> INSTALL debian/headertmp/usr/include/mtd/ (5 files)
>> INSTALL debian/headertmp/usr/include/rdma/ (6 files)
>> INSTALL debian/headertmp/usr/include/scsi/fc/ (4 files)
>> INSTALL debian/headertmp/usr/include/scsi/ (3 files)
>> INSTALL debian/headertmp/usr/include/sound/ (11 files)
>> INSTALL debian/headertmp/usr/include/video/ (3 files)
>> INSTALL debian/headertmp/usr/include/xen/ (4 files)
>> INSTALL debian/headertmp/usr/include/uapi/ (0 file)
>> INSTALL debian/headertmp/usr/include/asm/ (65 files)
>> dpkg-deb: building package `linux-headers-3.19.0-rc7-next-20150204.7-iniza-small' in `../linux-headers-3.19.0-rc7-next-20150204.7-iniza-small_3.19.0~rc7~next-20150204.7~precise+dileks1_amd64.deb'.
>> dpkg-deb: building package `linux-libc-dev' in `../linux-libc-dev_3.19.0~rc7~next-20150204.7~precise+dileks1_amd64.deb'.
>> dpkg-deb: building package `linux-image-3.19.0-rc7-next-20150204.7-iniza-small' in `../linux-image-3.19.0-rc7-next-20150204.7-iniza-small_3.19.0~rc7~next-20150204.7~precise+dileks1_amd64.deb'.
>
>