When using ipv6, a kthread will wait for router advertisements and calc the ip addr. If ssh-dump with ipv6-target-addr, there is a race between the kthread and kdump dumping process. kdump should wait until the ipv6 addr is ready. Since dracut has implemented this function, we can pass dhcp6 or auto6 in cmdline to activate it. But in 1st kernel, we can not know whether the ipv6 addr is got by dhcp6 or by auto6 without causing side-effect (dhclient -6 will realloc addr). To address it, we take the assumption that if /proc/sys/net/ipv6/conf/$netdev/autoconf is enabled, then the host uses auto6. Signed-off-by: Pingfan Liu <piliu(a)redhat.com&gt; --- v1->v2: commit log improvement dracut-module-setup.sh | 6 ++++++ kdump-lib.sh | 12 ++++++++++++ 2 files changed, 18 insertions(+) diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh index c0f1a88..d1dd673 100755 --- a/dracut-module-setup.sh +++ b/dracut-module-setup.sh @@ -293,6 +293,12 @@ kdump_setup_netdev() { _static=$(kdump_static_ip $_netdev $_srcaddr) if [ -n "$_static" ]; then _proto=none + elif is_ipv6_address $_srcaddr; then + if is_ipv6_auto $_netdev; then + _proto=auto6 + else + _proto=dhcp6 + fi else _proto=dhcp fi diff --git a/kdump-lib.sh b/kdump-lib.sh index d981c4f..ac4dc67 100755 --- a/kdump-lib.sh +++ b/kdump-lib.sh @@ -310,6 +310,18 @@ is_atomic() grep -q "ostree" /proc/cmdline } +# fixme, try the best to decide whether the ipv6 addr is allocated by slaac or dhcp6 +is_ipv6_auto() +{ + local _netdev=$1 + local _auto=$(cat /proc/sys/net/ipv6/conf/$_netdev/autoconf) + if [ $_auto -eq 1 ]; then + return 0 + else + return 1 + fi +} + is_ipv6_address() { echo $1 | grep -q ":" -- 2.7.4