On Thu, Oct 12, 2017 at 10:47:25AM +0200, Peter Zijlstra wrote:
On Tue, Oct 03, 2017 at 10:06:34PM +0800, Fengguang Wu wrote:
#!/bin/bash
kernel=$1
initrd=openwrt-trinity-i386.cgz
wget --no-clobber
https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd
kvm=(
qemu-system-x86_64
-enable-kvm
-cpu Haswell,+smep
-kernel $kernel
-initrd $initrd
-m 256
-smp 1
-device e1000,netdev=net0
-netdev user,id=net0
-boot order=nc
-no-reboot
-watchdog i6300esb
-watchdog-action debug
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
append=(
root=/dev/ram0
hung_task_panic=1
debug
apic=debug
sysrq_always_enabled
rcupdate.rcu_cpu_stall_timeout=100
net.ifnames=0
printk.devkmsg=on
panic=-1
softlockup_panic=1
nmi_watchdog=panic
oops=panic
load_ramdisk=2
prompt_ramdisk=0
drbd.minor_count=8
systemd.log_level=err
ignore_loglevel
console=tty0
earlyprintk=ttyS0,115200
console=ttyS0,115200
vga=normal
rw
drbd.minor_count=8
)
"${kvm[@]}" -append "${append[*]}"
So I was wanting to go chase that one splat you triggered, but the above
(after s/Haswell,+smep/host/) boots right up until it wants an init:
[ 0.000000] Kernel command line: root=/dev/ram0 hung_task_panic=1 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 drbd.minor_count=8
systemd.log_level=err ignore_loglevel console=tty0 earlyprintk=ttyS0,115200
console=ttyS0,115200 vga=normal rw drbd.minor_count=8
[ 35.721719] Kernel panic - not syncing: No working init found. Try passing
init= option to kernel. See Linux Documentation/admin-guide/init.rst for
guidance.
Well I got the same result. The script and initrd image matches well
with my local version. I'll dig what goes wrong.
And it did download that initrd thingy...
$ shasum openwrt-trinity-i386.cgz
0a405d02a162defd82a5ffd556fd24e0ee2f994a openwrt-trinity-i386.cgz
Anything else I need?
