Re: [x86, kvm] WARNING: at arch/x86/kernel/pvclock.c:182 pvclock_init_vsyscall()

Chen, Tiejun
2014-09-30T10:25:01Z

On 2014/9/30 15:59, Fengguang Wu wrote:
> Greetings,
>
> 0day kernel testing robot got the below dmesg and the first bad commit is
>
> commit 3dc4f7cfb7441e5e0fed3a02fc81cdaabd28300a
> Author: Marcelo Tosatti <mtosatti@redhat.com>
> AuthorDate: Tue Nov 27 23:28:56 2012 -0200
> Commit: Marcelo Tosatti <mtosatti@redhat.com>
> CommitDate: Tue Nov 27 23:29:10 2012 -0200
>
> x86: kvm guest: pvclock vsyscall support
>
> Hook into generic pvclock vsyscall code, with the aim to
> allow userspace to have visibility into pvclock data.
>
> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
>
> +--------------------------------------------------------------+------------+------------+------------+
> | | 71056ae22d | 3dc4f7cfb7 | d778df51c0 |
> +--------------------------------------------------------------+------------+------------+------------+
> | boot_successes | 141 | 0 | 0 |
> | boot_failures | 0 | 47 | 11 |
> | WARNING:at_arch/x86/kernel/pvclock.c:pvclock_init_vsyscall() | 0 | 47 | 11 |
> | backtrace:pvclock_init_vsyscall | 0 | 47 | 11 |
> | backtrace:warn_slowpath_null | 0 | 47 | 11 |
> | backtrace:kvm_setup_vsyscall_timeinfo | 0 | 47 | 11 |
> | backtrace:kvm_guest_init | 0 | 47 | 11 |
> | Kernel_panic-not_syncing:Attempted_to_kill_init_exitcode= | 0 | 0 | 7 |
> | BUG:kernel_boot_hang | 0 | 0 | 4 |
> +--------------------------------------------------------------+------------+------------+------------+
>
> [ 0.000000] mapped IOAPIC to ffffffffff5f9000 (fec00000)
> [ 0.000000] nr_irqs_gsi: 40
> [ 0.000000] ------------[ cut here ]------------
> [ 0.000000] WARNING: at arch/x86/kernel/pvclock.c:182 pvclock_init_vsyscall+0x41/0x8e()
> [ 0.000000] Hardware name: Standard PC (i440FX + PIIX, 1996)
> [ 0.000000] Modules linked in:
> [ 0.000000] Pid: 0, comm: swapper Not tainted 3.7.0-rc3-00112-g3dc4f7c #1

Looks you're working with old kernel, so its worth trying the latest again.

Tiejun

> [ 0.000000] Call Trace:
> [ 0.000000] [<ffffffff8104f750>] warn_slowpath_common+0x70/0xa0
> [ 0.000000] [<ffffffff8104f83a>] warn_slowpath_null+0x1a/0x20
> [ 0.000000] [<ffffffff8219a6af>] pvclock_init_vsyscall+0x41/0x8e
> [ 0.000000] [<ffffffff8219a623>] kvm_setup_vsyscall_timeinfo+0x48/0x78
> [ 0.000000] [<ffffffff8219a397>] kvm_guest_init+0x98/0xe1
> [ 0.000000] [<ffffffff82190eb8>] setup_arch+0xa9b/0xb10
> [ 0.000000] [<ffffffff818eeae8>] ? printk+0x4f/0x57
> [ 0.000000] [<ffffffff8218e856>] start_kernel+0x93/0x388
> [ 0.000000] [<ffffffff8218e120>] ? early_idt_handlers+0x120/0x120
> [ 0.000000] [<ffffffff8218e2b4>] x86_64_start_reservations+0xb0/0xb3
> [ 0.000000] [<ffffffff8218e3b9>] x86_64_start_kernel+0x102/0x10f
> [ 0.000000] ---[ end trace c9f7d63dd24af7e7 ]---
> [ 0.000000] KVM setup async PF for cpu 0
>
> git bisect start v3.8 v3.7 --
> git bisect bad 8d91a42e54eebc43f4d8f6064751ccba73528275 # 21:30 0- 5 Merge tag 'omap-late-cleanups' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
> git bisect bad 770b6cb4d21fb3e3df2a7a51e186a3c14db1ec30 # 21:35 0- 1 ARM: OMAP: Fix drivers to depend on omap for internal devices
> git bisect good 9977d9b379cb77e0f67bd6f4563618106e58e11d # 21:40 30+ 0 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal
> git bisect bad e777d192ffb9f2929d547a2f8a5f65b7db7a9552 # 21:44 4- 26 Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
> git bisect good 8b0cab14951fbf8126795ab301835a8f8126a988 # 22:00 30+ 0 Merge tag 'regulator-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator
> git bisect good c7708fac5a878d6e0f2de0aa19f9749cff4f707f # 22:11 30+ 0 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
> git bisect bad e05a1c6397a73d09389e033b6b2c25c954d2177c # 22:17 0- 1 Merge tag 'ktest-v3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-ktest
> git bisect good 896ea17d3da5f44b2625c9cda9874d7dfe447393 # 22:36 30+ 0 Merge tag 'stable/for-linus-3.8-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen
> git bisect bad 66cdd0ceaf65a18996f561b770eedde1d123b019 # 22:41 3- 3 Merge tag 'kvm-3.8-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm
> git bisect good 8455d79e2163997e479931b8d5b7e60a92cd2b86 # 23:04 30+ 0 KVM: PPC: Book3S HV: Run virtual core whenever any vcpus in it can run
> git bisect bad 78c634402a1825f1f5bef13077f0985f3b8a3212 # 23:11 3- 23 kvm: deliver msi interrupts from irq handler
> git bisect good 189e11731aa858597095fbe1e6d243bad26bd96b # 23:19 30+ 0 x86: pvclock: add note about rdtsc barriers
> git bisect bad b48aa97e38206a84bf8485e7c553412274708ce5 # 23:42 22- 8 KVM: x86: require matched TSC offsets for master clock
> git bisect bad 886b470cb14733a0286e365c77f1844c240c33a4 # 00:28 2- 5 KVM: x86: pass host_tsc to read_l1_tsc
> git bisect good 71056ae22d43f58d7e0f793af18ace2eaf5b74eb # 01:09 47+ 0 x86: pvclock: generic pvclock vsyscall initialization
> git bisect bad 51c19b4f5927f5a646e93d69f73c7e89ea14e737 # 02:16 0- 1 x86: vdso: pvclock gettime support
> git bisect bad 3dc4f7cfb7441e5e0fed3a02fc81cdaabd28300a # 02:45 0- 24 x86: kvm guest: pvclock vsyscall support
> # first bad commit: [3dc4f7cfb7441e5e0fed3a02fc81cdaabd28300a] x86: kvm guest: pvclock vsyscall support
> git bisect good 71056ae22d43f58d7e0f793af18ace2eaf5b74eb # 04:11 141+ 0 x86: pvclock: generic pvclock vsyscall initialization
>
>
> This script may reproduce the error.
>
> ----------------------------------------------------------------------------
> #!/bin/bash
>
> kernel=$1
> initrd=quantal-core-x86_64.cgz
>
> wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd
>
> kvm=(
> qemu-system-x86_64
> -cpu kvm64
> -enable-kvm
> -kernel $kernel
> -initrd $initrd
> -m 320
> -smp 2
> -net nic,vlan=1,model=e1000
> -net user,vlan=1
> -boot order=nc
> -no-reboot
> -watchdog i6300esb
> -rtc base=localtime
> -serial stdio
> -display none
> -monitor null
> )
>
> append=(
> hung_task_panic=1
> earlyprintk=ttyS0,115200
> debug
> apic=debug
> sysrq_always_enabled
> rcupdate.rcu_cpu_stall_timeout=100
> panic=-1
> softlockup_panic=1
> nmi_watchdog=panic
> oops=panic
> load_ramdisk=2
> prompt_ramdisk=0
> console=ttyS0,115200
> console=tty0
> vga=normal
> root=/dev/ram0
> rw
> drbd.minor_count=8
> )
>
> "${kvm[@]}" --append "${append[*]}"
> ----------------------------------------------------------------------------
>
> Thanks,
> Fengguang
>
>
>
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