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SubjectRe: [LKP] [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]
Hi Jens and Tejun,

>The command line was in the original email:
>
>$ qemu-system-x86_64 -enable-kvm -cpu Westmere -m 512M
>
>And agree, in general it'd be nice if there was a link to the image as
>well, so that folks can reproduce.

Yes we have a reproduce script internally, however need to polish it
up and make it general usable by kernel developers.

CC Philip. It'd be helpful to give more priority to the "lkp qemu"
reproduce command.

For the warning here, it does not depend on any initrd, I just
confirmed this simple script can reproduce the problem.

-----------------------------------------------------------------------------
#!/bin/bash

kernel=$1

kvm=(
qemu-system-x86_64
-enable-kvm
-cpu Westmere
-kernel $kernel
-m 1024
-smp 1
-device e1000,netdev=net0
-netdev user,id=net0
-boot order=nc
-no-reboot
-watchdog i6300esb
-watchdog-action debug
-rtc base=localtime
-nographic
)


append=(
ip=::::vm-kbuild-yocto-ia32-17::dhcp
root=/dev/ram0
debug
apic=debug
sysrq_always_enabled
rcupdate.rcu_cpu_stall_timeout=100
net.ifnames=0
printk.devkmsg=on
panic=-1
softlockup_panic=1
nmi_watchdog=panic
oops=panic
load_ramdisk=2
prompt_ramdisk=0
systemd.log_level=err
ignore_loglevel
earlyprintk=ttyS0,115200
console=ttyS0,115200
console=tty0
vga=normal
rw
)

"${kvm[@]}" -append "${append[*]}"
-----------------------------------------------------------------------------

Thanks,
Fengguang

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