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@xxxxxxxxxx>
AuthorDate: Tue Nov 27 23:28:56 2012 -0200
Commit: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
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@xxxxxxxxxx>
+--------------------------------------------------------------+------------+------------+------------+
| | 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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