Description of problem: Unbound crashed while being used as local resolver. Version-Release number of selected component (if applicable): unbound-1.7.3-10.fc28.x86_64 How reproducible: not sure. it happened after long time. Steps to Reproduce: 1. ?? Actual results: dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] notice: sendto failed: Address family not supported by protocol dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] notice: remote address is unknown (inet_ntop error) port 42115 (len 28) dec 12 10:20:29 thozza-work-pc systemd[1]: unbound.service: Main process exited, code=dumped, status=6/ABRT dec 12 10:20:29 thozza-work-pc systemd[1]: unbound.service: Failed with result 'core-dump'. Expected results: service does not crash Additional info: I have a core dump, but ABRT claimed it to be unusable. I tried to inspect it with GDB, but there does not seem to be any useful information. ... dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] debug: forwarder, ignoring referral from auth zone dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] debug: attempt to get extra 3 targets dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] debug: servselect ip4 10.11.5.19 port 53 (len 16) dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] debug: rtt=256 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] debug: servselect ip4 10.38.5.26 port 53 (len 16) dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] debug: rtt=76 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] debug: selrtt 76 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: sending query: b.root-servers.net. AAAA IN dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: mesh_run: end 1 recursion states (1 with reply, 0 detached), 2 waiting replies, 836 recursion replies sent, 0 replies dropped, 0 states jostled out dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: average recursion processing time 0.459386 sec dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: histogram of recursion processing times dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: [25%]=0.0310924 median[50%]=0.098304 [75%]=0.240299 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: lower(secs) upper(secs) recursions dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: 0.000000 0.000001 109 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: 0.000512 0.001024 1 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: 0.001024 0.002048 1 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: 0.002048 0.004096 3 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: 0.004096 0.008192 2 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: 0.008192 0.016384 14 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: 0.016384 0.032768 88 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: 0.032768 0.065536 116 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: 0.065536 0.131072 168 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: 0.131072 0.262144 150 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: 0.262144 0.524288 93 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: 0.524288 1.000000 35 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: 1.000000 2.000000 9 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: 2.000000 4.000000 33 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: 4.000000 8.000000 8 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: 8.000000 16.000000 2 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: 16.000000 32.000000 4 dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] info: 0RDd mod1 cb b.root-servers.net. AAAA IN dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] notice: sendto failed: Address family not supported by protocol dec 12 10:20:29 thozza-work-pc unbound[3069]: [3069:0] notice: remote address is unknown (inet_ntop error) port 42115 (len 28) dec 12 10:20:29 thozza-work-pc systemd[1]: unbound.service: Main process exited, code=dumped, status=6/ABRT dec 12 10:20:29 thozza-work-pc systemd[1]: unbound.service: Failed with result 'core-dump'.
*** Bug 1658494 has been marked as a duplicate of this bug. ***
It seems I got lucky this time, I were able to obtain useable backtrace with a core dump for analysis. It seems to be the same issue on the first glance. See bug #1667387
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