When I bring up one of my MongoDB instances (specifically the secondary) and don't assign it the correct elastic IP right away, when I later do assign it, it segfaults. Get a bunch of log messages where it tries to connect to the primary and errors because its current hostname doesn't match what's in the RS config (expected), but when its hostname changes and it tries, it just dies.

Not the end of the world, but it's pretty annoying, because you have to manually remap the IPs on every server restart.

Last few log entries (the replSet error happens a bunch of times):

Wed May 9 16:20:50 [rsStart] warning: getaddrinfo("ec2-184-72-56-224.us-west-1.compute.amazonaws.com") failed: Name or service not known
Wed May 9 16:20:50 [rsStart] getaddrinfo("ec2-184-72-56-224.us-west-1.compute.amazonaws.com") failed: Name or service not known
Wed May 9 16:20:50 [rsStart] replSet error self not present in the repl set configuration:
Wed May 9 16:20:50 [rsStart] { _id: "wish-friend", version: 1, members: [

{ _id: 1, host: "ec2-50-18-168-160.us-west-1.compute.amazonaws.com:27017", priority: 2.0 }

,

{ _id: 2, host: "ec2-184-72-56-224.us-west-1.compute.amazonaws.com:27017" }

,

{ _id: 99, host: "ec2-50-18-235-86.us-west-1.compute.amazonaws.com:27017", arbiterOnly: true }

] }
Wed May 9 16:20:50 [rsStart] replSet info Couldn't load config yet. Sleeping 20sec and will try again.
Wed May 9 16:20:53 [initandlisten] connection accepted from 127.0.0.1:50347 #58
Wed May 9 16:20:53 [conn58] end connection 127.0.0.1:50347
Wed May 9 16:20:54 [initandlisten] connection accepted from 127.0.0.1:50348 #59
Wed May 9 16:20:54 [conn59] end connection 127.0.0.1:50348
Wed May 9 16:20:56 [initandlisten] connection accepted from 10.170.70.136:51824 #60
Wed May 9 16:21:06 [initandlisten] connection accepted from 10.166.57.162:49390 #61
Wed May 9 16:21:10 [rsStart] trying to contact ec2-50-18-168-160.us-west-1.compute.amazonaws.com:27017
Wed May 9 16:21:10 [rsStart] trying to contact ec2-50-18-235-86.us-west-1.compute.amazonaws.com:27017
Wed May 9 16:21:10 Invalid access at address: 0

Wed May 9 16:21:10 Got signal: 11 (Segmentation fault).

Wed May 9 16:21:10 Backtrace:
0xa90999 0xa90f70 0x7f3a3f8cf060 0x7f3a3f65c4fb 0x7c80cd 0x7c9a47 0x7c9f3d 0xaab3e0 0x7f3a3f8c6efc 0x7f3a3ee6089d
/usr/bin/mongod(_ZN5mongo10abruptQuitEi+0x399) [0xa90999]
/usr/bin/mongod(_ZN5mongo24abruptQuitWithAddrSignalEiP7siginfoPv+0x220) [0xa90f70]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x10060) [0x7f3a3f8cf060]
/usr/lib/x86_64-linux-gnu/libstdc++.so.6(_ZNSsC1ERKSs+0xb) [0x7f3a3f65c4fb]
/usr/bin/mongod(_ZN5mongo11ReplSetImpl10loadConfigEv+0x32d) [0x7c80cd]
/usr/bin/mongod(_ZN5mongo11ReplSetImplC2ERNS_14ReplSetCmdlineE+0x3f7) [0x7c9a47]
/usr/bin/mongod(_ZN5mongo13startReplSetsEPNS_14ReplSetCmdlineE+0x5d) [0x7c9f3d]
/usr/bin/mongod(thread_proxy+0x80) [0xaab3e0]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x7efc) [0x7f3a3f8c6efc]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7f3a3ee6089d]

Logstream::get called in uninitialized state
Wed May 9 16:21:10 ERROR: Client::shutdown not called: rsStart