Please ignore these two patch, I send it to the wrong mailing list.
Sorry for the noise.
----- Original Message -----
> From: "Pingfan Liu" <piliu at redhat.com>
> To: kexec at lists.infradead.org
> Cc: "Dave Young" <dyoung at redhat.com>, "Baoquan He" <bhe at redhat.com>
> Sent: Monday, April 17, 2017 2:44:35 PM
> Subject: [PATCH 1/2] kdump-lib-initramfs.sh: ignore the failure of echo
>
> The kdump-capture.service will fail, if the following conds are meet up.
> -1. boot up a VM with the following cmd:
> qemu-kvm -name 'avocado-vt-vm1' -sandbox off -machine pc -nodefaults
> -vga cirrus \
> -drive
> id=drive_image1,if=none,snapshot=off,aio=native,cache=none,format=qcow2,file=$guest_img
> \
> -device
> virtio-blk-pci,id=image1,drive=drive_image1,bootindex=0,bus=pci.0,addr=04
> \
> -device
> virtio-net-pci,mac=9a:4d:4e:4f:50:51,id=id3DveCw,vectors=4,netdev=idgW5YRp,bus=pci.0,addr=05
> \
> -netdev tap,id=idgW5YRp \
> -m 2048 \
> -smp 4,maxcpus=4,cores=2,threads=1,sockets=2 \
> -cpu 'SandyBridge',+kvm_pv_unhalt \
> -vnc :0 \
> -rtc base=utc,clock=host,driftfix=slew \
> -boot order=cdn,once=c,menu=off,strict=off \
> -enable-kvm \
> -monitor stdio \
> -qmp tcp:localhost:4444,server,nowait
> -2. in kernel cmdline with the following options: console=tty0 console=ttyS0,
>
> Because the "-nodefaults" option in qemu cmd excludes the emulation of
> serial port, the ttyS0 will
> have no real backend device. We can observe such issue in 1st kernel by:
> echo teststring > /dev/console or
> echo teststring > /dev/ttyS0,
> It gets the error "-bash: echo: write error: Input/output error".
> Such conds cause small issue in 1st kernel, but it is a big problem for
> kdump-capture and emergency
> service.
>
> This patch aims to work aroundthe issue in kdump-capture service:
> dump_fs() return value will affect the following code in dracut-kdump.sh
> DUMP_RETVAL=$? <---
> do_kdump_post $DUMP_RETVAL
> if [ $? -ne 0 ]; then
> echo "kdump: kdump_post script exited with non-zero status!"
> fi
>
> Although kdump-capture saves the vmcore successfully, but it exit 1 and
> fall on emergency service.
>
> Signed-off-by: Pingfan Liu <piliu at redhat.com>
> ---
> kdump-lib-initramfs.sh | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/kdump-lib-initramfs.sh b/kdump-lib-initramfs.sh
> index 4c0e2e2..2c18c87 100755
> --- a/kdump-lib-initramfs.sh
> +++ b/kdump-lib-initramfs.sh
> @@ -111,6 +111,8 @@ dump_fs()
> sync
>
> echo "kdump: saving vmcore complete"
> + # improper kernel cmdline can cause the failure of echo, we can ignore
> this kind of failure
> + return 0
> }
>
> save_vmcore_dmesg_fs() {
> --
> 2.7.4
>
>
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