Date: Wed, 19 Nov 2014 23:35:29 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 195191] New: [patch] rtadvd(8): rtadvd should retry on NET_RT_IFLIST sysctl failure like getifaddrs Message-ID: <bug-195191-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195191 Bug ID: 195191 Summary: [patch] rtadvd(8): rtadvd should retry on NET_RT_IFLIST sysctl failure like getifaddrs Product: Base System Version: 11.0-CURRENT Hardware: Any OS: Any Status: Needs Triage Severity: Affects Only Me Priority: --- Component: bin Assignee: freebsd-bugs@FreeBSD.org Reporter: guyyur@gmail.com Created attachment 149611 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=149611&action=edit Retry NET_RT_IFLIST sysctl. rtadvd exits after printing the message: rtadvd[41840]: <update_ifinfo> sysctl: NET_RT_IFLIST get failed The NET_RT_IFLIST sysctl required buffer size can change between the request for the size and the request for the data. getifaddrs handles this by retrying the sysctl several times. I copied the comment and looping from lib/libc/net/getifaddrs.c to have rtadvd behave like getifaddrs. rtadvd should probably also be changed to not need to call the sysctl for every message if the required info can be obtained by other means. Issue replicated in an environment with dhcpcd for DHCPv6-PD giving an address to a lan interface and a tun interface. Restarting dhcpcd can sometimes trigger the problem. dhcpcd adds a global ipv6 addresses and routes to the interfaces triggering RTM_NEWADDR and RTM_ADD. rtadvd calls update_ifinfo on RTM_NEWADDR and RTM_ADD. The likely scenario is: dhcpcd adds an address for the lan interface. rtadvd receives RTM_NEWADDR for the lan interface. rtadvd calls the sysctl to get the required size. dhcpcd adds an address for the tun interface. size changed. rtadvd calls the sysctl to get the data size with small buffer. -- You are receiving this mail because: You are the assignee for the bug.
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