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