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bugfix infinite-recursion if domain not resolved #9

Merged
merged 2 commits into from
Sep 22, 2022
Merged

bugfix infinite-recursion if domain not resolved #9

merged 2 commits into from
Sep 22, 2022

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kokizzu
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@kokizzu kokizzu commented Sep 22, 2022 •
edited
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Test plan:

dnstrace example.com
# should no longer memory leak
# previously, stuck, infinite recursion allocates 300MB every second until it OOM-killed

dnstrace facebook.com
# still returning normally
# previously returning normally

@kokizzu
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kokizzu commented Sep 22, 2022 •
edited
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this changes:

root@vmi574213:/tmp# ./main example.com
1 - query A example.com.: opcode: QUERY, status: NOERROR, id: 53008, flags: qr rd;
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on M.root-servers.net.(2001:dc3::35): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on F.root-servers.net.(2001:500:2f::f): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on E.root-servers.net.(2001:500:a8::e): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on C.root-servers.net.(2001:500:2::c): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on G.root-servers.net.(2001:500:12::d0d): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on B.root-servers.net.(2001:500:200::b): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on D.root-servers.net.(2001:500:2d::d): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on A.root-servers.net.(2001:503:ba3e::2:30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on J.root-servers.net.(2001:503:c27::2:30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on H.root-servers.net.(2001:500:1::53): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on K.root-servers.net.(2001:7fd::1): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on L.root-servers.net.(2001:500:9f::42): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on I.root-servers.net.(2001:7fe::53): connect: network is unreachable
  - 1878 bytes in 2.27ms + 0ms (from glue) lookup on D.root-servers.net.(199.7.91.13)
  - 1878 bytes in 2.71ms + 0ms (from glue) lookup on E.root-servers.net.(192.203.230.10)
  - 1878 bytes in 2.76ms + 0ms (from glue) lookup on F.root-servers.net.(192.5.5.241)
  - 1878 bytes in 2.64ms + 0ms (from glue) lookup on B.root-servers.net.(199.9.14.201)
  - 1878 bytes in 2.11ms + 0ms (from glue) lookup on J.root-servers.net.(192.58.128.30)
  - 1878 bytes in 2.38ms + 0ms (from glue) lookup on L.root-servers.net.(199.7.83.42)
  - 1878 bytes in 2.64ms + 0ms (from glue) lookup on I.root-servers.net.(192.36.148.17)
  - 1878 bytes in 4.34ms + 0ms (from glue) lookup on C.root-servers.net.(192.33.4.12)
  - 1878 bytes in 6.56ms + 0ms (from glue) lookup on M.root-servers.net.(202.12.27.33)
  - 1878 bytes in 67.74ms + 0ms (from glue) lookup on H.root-servers.net.(198.97.190.53)
  - 1878 bytes in 67.36ms + 0ms (from glue) lookup on K.root-servers.net.(193.0.14.129)
  - 1878 bytes in 84.37ms + 0ms (from glue) lookup on G.root-servers.net.(192.112.36.4)
  - 1878 bytes in 161.95ms + 0ms (from glue) lookup on A.root-servers.net.(198.41.0.4)
com. 172800 NS a.gtld-servers.net. (glue: 192.5.6.30,2001:503:a83e::2:30)
com. 172800 NS b.gtld-servers.net. (glue: 192.33.14.30,2001:503:231d::2:30)
com. 172800 NS c.gtld-servers.net. (glue: 192.26.92.30,2001:503:83eb::30)
com. 172800 NS d.gtld-servers.net. (glue: 192.31.80.30,2001:500:856e::30)
com. 172800 NS e.gtld-servers.net. (glue: 192.12.94.30,2001:502:1ca1::30)
com. 172800 NS f.gtld-servers.net. (glue: 192.35.51.30,2001:503:d414::30)
com. 172800 NS g.gtld-servers.net. (glue: 192.42.93.30,2001:503:eea3::30)
com. 172800 NS h.gtld-servers.net. (glue: 192.54.112.30,2001:502:8cc::30)
com. 172800 NS i.gtld-servers.net. (glue: 192.43.172.30,2001:503:39c1::30)
com. 172800 NS j.gtld-servers.net. (glue: 192.48.79.30,2001:502:7094::30)
com. 172800 NS k.gtld-servers.net. (glue: 192.52.178.30,2001:503:d2d::30)
com. 172800 NS l.gtld-servers.net. (glue: 192.41.162.30,2001:500:d937::30)
com. 172800 NS m.gtld-servers.net. (glue: 192.55.83.30,2001:501:b1f9::30)

2 - query A example.com.: opcode: QUERY, status: NOERROR, id: 53008, flags: qr rd;
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on m.gtld-servers.net.(2001:501:b1f9::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on b.gtld-servers.net.(2001:503:231d::2:30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on g.gtld-servers.net.(2001:503:eea3::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on a.gtld-servers.net.(2001:503:a83e::2:30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on e.gtld-servers.net.(2001:502:1ca1::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on d.gtld-servers.net.(2001:500:856e::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on f.gtld-servers.net.(2001:503:d414::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on c.gtld-servers.net.(2001:503:83eb::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on h.gtld-servers.net.(2001:502:8cc::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on l.gtld-servers.net.(2001:500:d937::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on k.gtld-servers.net.(2001:503:d2d::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on i.gtld-servers.net.(2001:503:39c1::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on j.gtld-servers.net.(2001:502:7094::30): connect: network is unreachable
  - 652 bytes in 2.48ms + 0ms (from glue) lookup on b.gtld-servers.net.(192.33.14.30)
  - 652 bytes in 149.94ms + 0ms (from glue) lookup on c.gtld-servers.net.(192.26.92.30)
  - 652 bytes in 151.01ms + 0ms (from glue) lookup on e.gtld-servers.net.(192.12.94.30)
  - 652 bytes in 151.57ms + 0ms (from glue) lookup on g.gtld-servers.net.(192.42.93.30)
  - 652 bytes in 152.68ms + 0ms (from glue) lookup on i.gtld-servers.net.(192.43.172.30)
  - 652 bytes in 158.05ms + 0ms (from glue) lookup on j.gtld-servers.net.(192.48.79.30)
  - 652 bytes in 158.11ms + 0ms (from glue) lookup on m.gtld-servers.net.(192.55.83.30)
  - 652 bytes in 158.19ms + 0ms (from glue) lookup on k.gtld-servers.net.(192.52.178.30)
  - 652 bytes in 158.71ms + 0ms (from glue) lookup on l.gtld-servers.net.(192.41.162.30)
  - 652 bytes in 161.32ms + 0ms (from glue) lookup on h.gtld-servers.net.(192.54.112.30)
  - 652 bytes in 162.35ms + 0ms (from glue) lookup on f.gtld-servers.net.(192.35.51.30)
  - 652 bytes in 164.09ms + 0ms (from glue) lookup on d.gtld-servers.net.(192.31.80.30)
  - 652 bytes in 176.16ms + 0ms (from glue) lookup on a.gtld-servers.net.(192.5.6.30)
example.com. 172800 NS a.iana-servers.net. (no glue)
example.com. 172800 NS b.iana-servers.net. (no glue)
*** error: no response --> not stuck


root@vmi574213:/tmp# ./main facebook.com
1 - query A facebook.com.: opcode: QUERY, status: NOERROR, id: 28564, flags: qr rd;
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on M.root-servers.net.(2001:dc3::35): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on B.root-servers.net.(2001:500:200::b): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on H.root-servers.net.(2001:500:1::53): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on D.root-servers.net.(2001:500:2d::d): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on F.root-servers.net.(2001:500:2f::f): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on C.root-servers.net.(2001:500:2::c): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on I.root-servers.net.(2001:7fe::53): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on J.root-servers.net.(2001:503:c27::2:30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on A.root-servers.net.(2001:503:ba3e::2:30): connect: network is unreachable
  - 1879 bytes in 5.89ms + 0ms (from glue) lookup on E.root-servers.net.(192.203.230.10)
  - 1879 bytes in 5.93ms + 0ms (from glue) lookup on C.root-servers.net.(192.33.4.12)
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on K.root-servers.net.(2001:7fd::1): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on L.root-servers.net.(2001:500:9f::42): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on G.root-servers.net.(2001:500:12::d0d): connect: network is unreachable
  - 1879 bytes in 8.08ms + 0ms (from glue) lookup on J.root-servers.net.(192.58.128.30)
  - 1879 bytes in 8.34ms + 0ms (from glue) lookup on F.root-servers.net.(192.5.5.241)
  - 1879 bytes in 5.61ms + 0ms (from glue) lookup on L.root-servers.net.(199.7.83.42)
  - 1879 bytes in 6.45ms + 0ms (from glue) lookup on M.root-servers.net.(202.12.27.33)
  - 1879 bytes in 14.21ms + 0ms (from glue) lookup on D.root-servers.net.(199.7.91.13)
  - 1879 bytes in 13.73ms + 0ms (from glue) lookup on I.root-servers.net.(192.36.148.17)
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on E.root-servers.net.(2001:500:a8::e): connect: network is unreachable
  - 1879 bytes in 30.10ms + 0ms (from glue) lookup on B.root-servers.net.(199.9.14.201)
  - 1879 bytes in 67.41ms + 0ms (from glue) lookup on K.root-servers.net.(193.0.14.129)
  - 1879 bytes in 67.07ms + 0ms (from glue) lookup on H.root-servers.net.(198.97.190.53)
  - 1879 bytes in 85.16ms + 0ms (from glue) lookup on G.root-servers.net.(192.112.36.4)
  - 1879 bytes in 149.56ms + 0ms (from glue) lookup on A.root-servers.net.(198.41.0.4)
com. 172800 NS a.gtld-servers.net. (glue: 192.5.6.30,2001:503:a83e::2:30)
com. 172800 NS b.gtld-servers.net. (glue: 192.33.14.30,2001:503:231d::2:30)
com. 172800 NS c.gtld-servers.net. (glue: 192.26.92.30,2001:503:83eb::30)
com. 172800 NS d.gtld-servers.net. (glue: 192.31.80.30,2001:500:856e::30)
com. 172800 NS e.gtld-servers.net. (glue: 192.12.94.30,2001:502:1ca1::30)
com. 172800 NS f.gtld-servers.net. (glue: 192.35.51.30,2001:503:d414::30)
com. 172800 NS g.gtld-servers.net. (glue: 192.42.93.30,2001:503:eea3::30)
com. 172800 NS h.gtld-servers.net. (glue: 192.54.112.30,2001:502:8cc::30)
com. 172800 NS i.gtld-servers.net. (glue: 192.43.172.30,2001:503:39c1::30)
com. 172800 NS j.gtld-servers.net. (glue: 192.48.79.30,2001:502:7094::30)
com. 172800 NS k.gtld-servers.net. (glue: 192.52.178.30,2001:503:d2d::30)
com. 172800 NS l.gtld-servers.net. (glue: 192.41.162.30,2001:500:d937::30)
com. 172800 NS m.gtld-servers.net. (glue: 192.55.83.30,2001:501:b1f9::30)

2 - query A facebook.com.: opcode: QUERY, status: NOERROR, id: 28564, flags: qr rd;
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on m.gtld-servers.net.(2001:501:b1f9::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on g.gtld-servers.net.(2001:503:eea3::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on h.gtld-servers.net.(2001:502:8cc::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on i.gtld-servers.net.(2001:503:39c1::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on c.gtld-servers.net.(2001:503:83eb::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on j.gtld-servers.net.(2001:502:7094::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on a.gtld-servers.net.(2001:503:a83e::2:30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on b.gtld-servers.net.(2001:503:231d::2:30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on k.gtld-servers.net.(2001:503:d2d::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on d.gtld-servers.net.(2001:500:856e::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on l.gtld-servers.net.(2001:500:d937::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on e.gtld-servers.net.(2001:502:1ca1::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on f.gtld-servers.net.(2001:503:d414::30): connect: network is unreachable
  - 1184 bytes in 152.02ms + 0ms (from glue) lookup on g.gtld-servers.net.(192.42.93.30)
  - 1184 bytes in 157.28ms + 0ms (from glue) lookup on l.gtld-servers.net.(192.41.162.30)
  - 1184 bytes in 157.85ms + 0ms (from glue) lookup on j.gtld-servers.net.(192.48.79.30)
  - 1184 bytes in 158.69ms + 0ms (from glue) lookup on k.gtld-servers.net.(192.52.178.30)
  - 1184 bytes in 161.70ms + 0ms (from glue) lookup on i.gtld-servers.net.(192.43.172.30)
  - 1184 bytes in 161.55ms + 0ms (from glue) lookup on b.gtld-servers.net.(192.33.14.30)
  - 1184 bytes in 162.17ms + 0ms (from glue) lookup on h.gtld-servers.net.(192.54.112.30)
  - 1184 bytes in 162.31ms + 0ms (from glue) lookup on f.gtld-servers.net.(192.35.51.30)
  - 1184 bytes in 163.29ms + 0ms (from glue) lookup on a.gtld-servers.net.(192.5.6.30)
  - 1184 bytes in 163.08ms + 0ms (from glue) lookup on e.gtld-servers.net.(192.12.94.30)
  - 1184 bytes in 164.03ms + 0ms (from glue) lookup on c.gtld-servers.net.(192.26.92.30)
  - 1184 bytes in 164.04ms + 0ms (from glue) lookup on d.gtld-servers.net.(192.31.80.30)
  - 1184 bytes in 170.78ms + 0ms (from glue) lookup on m.gtld-servers.net.(192.55.83.30)
facebook.com. 172800 NS a.ns.facebook.com. (glue: 129.134.30.12,2a03:2880:f0fc:c:face:b00c:0:35)
facebook.com. 172800 NS b.ns.facebook.com. (glue: 129.134.31.12,2a03:2880:f0fd:c:face:b00c:0:35)
facebook.com. 172800 NS c.ns.facebook.com. (glue: 185.89.218.12,2a03:2880:f1fc:c:face:b00c:0:35)
facebook.com. 172800 NS d.ns.facebook.com. (glue: 185.89.219.12,2a03:2880:f1fd:c:face:b00c:0:35)

3 - query A facebook.com.: opcode: QUERY, status: NOERROR, id: 28564, flags: qr aa rd;
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on d.ns.facebook.com.(2a03:2880:f1fd:c:face:b00c:0:35): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on b.ns.facebook.com.(2a03:2880:f0fd:c:face:b00c:0:35): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on c.ns.facebook.com.(2a03:2880:f1fc:c:face:b00c:0:35): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on a.ns.facebook.com.(2a03:2880:f0fc:c:face:b00c:0:35): connect: network is unreachable
  - 69 bytes in 1.57ms + 0ms (from glue) lookup on c.ns.facebook.com.(185.89.218.12)
  - 69 bytes in 1.49ms + 0ms (from glue) lookup on b.ns.facebook.com.(129.134.31.12)
  - 69 bytes in 188.83ms + 0ms (from glue) lookup on a.ns.facebook.com.(129.134.30.12)
  - 69 bytes in 195.05ms + 0ms (from glue) lookup on d.ns.facebook.com.(185.89.219.12)

;; Cold best path time: 159.125463ms

facebook.com.   300     IN      A       31.13.68.35

previous version:

root@vmi574213:/tmp# ~/go/bin/dnstrace example.com
1 - query A example.com.: opcode: QUERY, status: NOERROR, id: 58163, flags: qr rd;
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on M.root-servers.net.(2001:dc3::35): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on C.root-servers.net.(2001:500:2::c): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on B.root-servers.net.(2001:500:200::b): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on I.root-servers.net.(2001:7fe::53): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on K.root-servers.net.(2001:7fd::1): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on J.root-servers.net.(2001:503:c27::2:30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on L.root-servers.net.(2001:500:9f::42): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on E.root-servers.net.(2001:500:a8::e): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on D.root-servers.net.(2001:500:2d::d): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on F.root-servers.net.(2001:500:2f::f): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on G.root-servers.net.(2001:500:12::d0d): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on A.root-servers.net.(2001:503:ba3e::2:30): connect: network is unreachable
  - 1878 bytes in 0.56ms + 0ms (from glue) lookup on E.root-servers.net.(192.203.230.10)
  - 1878 bytes in 0.59ms + 0ms (from glue) lookup on D.root-servers.net.(199.7.91.13)
  - 1878 bytes in 0.89ms + 0ms (from glue) lookup on J.root-servers.net.(192.58.128.30)
  - 1878 bytes in 0.93ms + 0ms (from glue) lookup on L.root-servers.net.(199.7.83.42)
  - 1878 bytes in 1.34ms + 0ms (from glue) lookup on I.root-servers.net.(192.36.148.17)
  - 1878 bytes in 1.13ms + 0ms (from glue) lookup on F.root-servers.net.(192.5.5.241)
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on H.root-servers.net.(2001:500:1::53): connect: network is unreachable
  - 1878 bytes in 3.18ms + 0ms (from glue) lookup on C.root-servers.net.(192.33.4.12)
  - 1878 bytes in 3.02ms + 0ms (from glue) lookup on B.root-servers.net.(199.9.14.201)
  - 1878 bytes in 6.56ms + 0ms (from glue) lookup on M.root-servers.net.(202.12.27.33)
  - 1878 bytes in 67.51ms + 0ms (from glue) lookup on K.root-servers.net.(193.0.14.129)
  - 1878 bytes in 67.29ms + 0ms (from glue) lookup on H.root-servers.net.(198.97.190.53)
  - 1878 bytes in 88.78ms + 0ms (from glue) lookup on G.root-servers.net.(192.112.36.4)
  - 1878 bytes in 150.09ms + 0ms (from glue) lookup on A.root-servers.net.(198.41.0.4)
com. 172800 NS a.gtld-servers.net. (glue: 192.5.6.30,2001:503:a83e::2:30)
com. 172800 NS b.gtld-servers.net. (glue: 192.33.14.30,2001:503:231d::2:30)
com. 172800 NS c.gtld-servers.net. (glue: 192.26.92.30,2001:503:83eb::30)
com. 172800 NS d.gtld-servers.net. (glue: 192.31.80.30,2001:500:856e::30)
com. 172800 NS e.gtld-servers.net. (glue: 192.12.94.30,2001:502:1ca1::30)
com. 172800 NS f.gtld-servers.net. (glue: 192.35.51.30,2001:503:d414::30)
com. 172800 NS g.gtld-servers.net. (glue: 192.42.93.30,2001:503:eea3::30)
com. 172800 NS h.gtld-servers.net. (glue: 192.54.112.30,2001:502:8cc::30)
com. 172800 NS i.gtld-servers.net. (glue: 192.43.172.30,2001:503:39c1::30)
com. 172800 NS j.gtld-servers.net. (glue: 192.48.79.30,2001:502:7094::30)
com. 172800 NS k.gtld-servers.net. (glue: 192.52.178.30,2001:503:d2d::30)
com. 172800 NS l.gtld-servers.net. (glue: 192.41.162.30,2001:500:d937::30)
com. 172800 NS m.gtld-servers.net. (glue: 192.55.83.30,2001:501:b1f9::30)

2 - query A example.com.: opcode: QUERY, status: NOERROR, id: 58163, flags: qr rd;
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on f.gtld-servers.net.(2001:503:d414::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on m.gtld-servers.net.(2001:501:b1f9::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on c.gtld-servers.net.(2001:503:83eb::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on j.gtld-servers.net.(2001:502:7094::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on b.gtld-servers.net.(2001:503:231d::2:30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on k.gtld-servers.net.(2001:503:d2d::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on e.gtld-servers.net.(2001:502:1ca1::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on d.gtld-servers.net.(2001:500:856e::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on l.gtld-servers.net.(2001:500:d937::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on g.gtld-servers.net.(2001:503:eea3::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on h.gtld-servers.net.(2001:502:8cc::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on a.gtld-servers.net.(2001:503:a83e::2:30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on i.gtld-servers.net.(2001:503:39c1::30): connect: network is unreachable
  - 652 bytes in 1.36ms + 0ms (from glue) lookup on b.gtld-servers.net.(192.33.14.30)
  - 652 bytes in 152.25ms + 0ms (from glue) lookup on g.gtld-servers.net.(192.42.93.30)
  - 652 bytes in 152.24ms + 0ms (from glue) lookup on f.gtld-servers.net.(192.35.51.30)
  - 652 bytes in 152.23ms + 0ms (from glue) lookup on i.gtld-servers.net.(192.43.172.30)
  - 652 bytes in 153.28ms + 0ms (from glue) lookup on h.gtld-servers.net.(192.54.112.30)
  - 652 bytes in 157.09ms + 0ms (from glue) lookup on k.gtld-servers.net.(192.52.178.30)
  - 652 bytes in 160.70ms + 0ms (from glue) lookup on m.gtld-servers.net.(192.55.83.30)
  - 652 bytes in 160.86ms + 0ms (from glue) lookup on l.gtld-servers.net.(192.41.162.30)
  - 652 bytes in 160.95ms + 0ms (from glue) lookup on j.gtld-servers.net.(192.48.79.30)
  - 652 bytes in 165.16ms + 0ms (from glue) lookup on a.gtld-servers.net.(192.5.6.30)
  - 652 bytes in 165.30ms + 0ms (from glue) lookup on c.gtld-servers.net.(192.26.92.30)
  - 652 bytes in 164.89ms + 0ms (from glue) lookup on e.gtld-servers.net.(192.12.94.30)
  - 652 bytes in 181.19ms + 0ms (from glue) lookup on d.gtld-servers.net.(192.31.80.30)
example.com. 172800 NS a.iana-servers.net. (no glue)
example.com. 172800 NS b.iana-servers.net. (no glue)
^C --> stuck forever until OOM-killed


root@vmi574213:/tmp# ~/go/bin/dnstrace facebook.com
1 - query A facebook.com.: opcode: QUERY, status: NOERROR, id: 2806, flags: qr rd;
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on M.root-servers.net.(2001:dc3::35): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on G.root-servers.net.(2001:500:12::d0d): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on H.root-servers.net.(2001:500:1::53): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on I.root-servers.net.(2001:7fe::53): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on A.root-servers.net.(2001:503:ba3e::2:30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on J.root-servers.net.(2001:503:c27::2:30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on K.root-servers.net.(2001:7fd::1): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on L.root-servers.net.(2001:500:9f::42): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on D.root-servers.net.(2001:500:2d::d): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on E.root-servers.net.(2001:500:a8::e): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on F.root-servers.net.(2001:500:2f::f): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on C.root-servers.net.(2001:500:2::c): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on B.root-servers.net.(2001:500:200::b): connect: network is unreachable
  - 1879 bytes in 2.52ms + 0ms (from glue) lookup on E.root-servers.net.(192.203.230.10)
  - 1879 bytes in 4.33ms + 0ms (from glue) lookup on J.root-servers.net.(192.58.128.30)
  - 1879 bytes in 4.45ms + 0ms (from glue) lookup on D.root-servers.net.(199.7.91.13)
  - 1879 bytes in 4.69ms + 0ms (from glue) lookup on I.root-servers.net.(192.36.148.17)
  - 1879 bytes in 5.87ms + 0ms (from glue) lookup on C.root-servers.net.(192.33.4.12)
  - 1879 bytes in 6.13ms + 0ms (from glue) lookup on B.root-servers.net.(199.9.14.201)
  - 1879 bytes in 5.99ms + 0ms (from glue) lookup on F.root-servers.net.(192.5.5.241)
  - 1879 bytes in 6.55ms + 0ms (from glue) lookup on M.root-servers.net.(202.12.27.33)
  - 1879 bytes in 6.66ms + 0ms (from glue) lookup on L.root-servers.net.(199.7.83.42)
  - 1879 bytes in 67.65ms + 0ms (from glue) lookup on K.root-servers.net.(193.0.14.129)
  - 1879 bytes in 67.88ms + 0ms (from glue) lookup on H.root-servers.net.(198.97.190.53)
  - 1879 bytes in 76.69ms + 0ms (from glue) lookup on G.root-servers.net.(192.112.36.4)
  - 1879 bytes in 149.00ms + 0ms (from glue) lookup on A.root-servers.net.(198.41.0.4)
com. 172800 NS a.gtld-servers.net. (glue: 192.5.6.30,2001:503:a83e::2:30)
com. 172800 NS b.gtld-servers.net. (glue: 192.33.14.30,2001:503:231d::2:30)
com. 172800 NS c.gtld-servers.net. (glue: 192.26.92.30,2001:503:83eb::30)
com. 172800 NS d.gtld-servers.net. (glue: 192.31.80.30,2001:500:856e::30)
com. 172800 NS e.gtld-servers.net. (glue: 192.12.94.30,2001:502:1ca1::30)
com. 172800 NS f.gtld-servers.net. (glue: 192.35.51.30,2001:503:d414::30)
com. 172800 NS g.gtld-servers.net. (glue: 192.42.93.30,2001:503:eea3::30)
com. 172800 NS h.gtld-servers.net. (glue: 192.54.112.30,2001:502:8cc::30)
com. 172800 NS i.gtld-servers.net. (glue: 192.43.172.30,2001:503:39c1::30)
com. 172800 NS j.gtld-servers.net. (glue: 192.48.79.30,2001:502:7094::30)
com. 172800 NS k.gtld-servers.net. (glue: 192.52.178.30,2001:503:d2d::30)
com. 172800 NS l.gtld-servers.net. (glue: 192.41.162.30,2001:500:d937::30)
com. 172800 NS m.gtld-servers.net. (glue: 192.55.83.30,2001:501:b1f9::30)

2 - query A facebook.com.: opcode: QUERY, status: NOERROR, id: 2806, flags: qr rd;
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on m.gtld-servers.net.(2001:501:b1f9::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on g.gtld-servers.net.(2001:503:eea3::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on c.gtld-servers.net.(2001:503:83eb::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on l.gtld-servers.net.(2001:500:d937::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on b.gtld-servers.net.(2001:503:231d::2:30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on j.gtld-servers.net.(2001:502:7094::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on h.gtld-servers.net.(2001:502:8cc::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on i.gtld-servers.net.(2001:503:39c1::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on k.gtld-servers.net.(2001:503:d2d::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on a.gtld-servers.net.(2001:503:a83e::2:30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on e.gtld-servers.net.(2001:502:1ca1::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on d.gtld-servers.net.(2001:500:856e::30): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on f.gtld-servers.net.(2001:503:d414::30): connect: network is unreachable
  - 1184 bytes in 149.49ms + 0ms (from glue) lookup on c.gtld-servers.net.(192.26.92.30)
  - 1184 bytes in 149.31ms + 0ms (from glue) lookup on a.gtld-servers.net.(192.5.6.30)
  - 1184 bytes in 149.92ms + 0ms (from glue) lookup on d.gtld-servers.net.(192.31.80.30)
  - 1184 bytes in 152.09ms + 0ms (from glue) lookup on h.gtld-servers.net.(192.54.112.30)
  - 1184 bytes in 153.24ms + 0ms (from glue) lookup on g.gtld-servers.net.(192.42.93.30)
  - 1184 bytes in 154.26ms + 0ms (from glue) lookup on m.gtld-servers.net.(192.55.83.30)
  - 1184 bytes in 159.09ms + 0ms (from glue) lookup on j.gtld-servers.net.(192.48.79.30)
  - 1184 bytes in 161.53ms + 0ms (from glue) lookup on b.gtld-servers.net.(192.33.14.30)
  - 1184 bytes in 161.73ms + 0ms (from glue) lookup on f.gtld-servers.net.(192.35.51.30)
  - 1184 bytes in 162.07ms + 0ms (from glue) lookup on i.gtld-servers.net.(192.43.172.30)
  - 1184 bytes in 163.36ms + 0ms (from glue) lookup on k.gtld-servers.net.(192.52.178.30)
  - 1184 bytes in 163.82ms + 0ms (from glue) lookup on e.gtld-servers.net.(192.12.94.30)
  - 1184 bytes in 165.62ms + 0ms (from glue) lookup on l.gtld-servers.net.(192.41.162.30)
facebook.com. 172800 NS a.ns.facebook.com. (glue: 129.134.30.12,2a03:2880:f0fc:c:face:b00c:0:35)
facebook.com. 172800 NS b.ns.facebook.com. (glue: 129.134.31.12,2a03:2880:f0fd:c:face:b00c:0:35)
facebook.com. 172800 NS c.ns.facebook.com. (glue: 185.89.218.12,2a03:2880:f1fc:c:face:b00c:0:35)
facebook.com. 172800 NS d.ns.facebook.com. (glue: 185.89.219.12,2a03:2880:f1fd:c:face:b00c:0:35)

3 - query A facebook.com.: opcode: QUERY, status: NOERROR, id: 2806, flags: qr aa rd;
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on d.ns.facebook.com.(2a03:2880:f1fd:c:face:b00c:0:35): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on b.ns.facebook.com.(2a03:2880:f0fd:c:face:b00c:0:35): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on a.ns.facebook.com.(2a03:2880:f0fc:c:face:b00c:0:35): connect: network is unreachable
  - 0 bytes in 0.00ms + 0ms (from glue) lookup on c.ns.facebook.com.(2a03:2880:f1fc:c:face:b00c:0:35): connect: network is unreachable
  - 69 bytes in 1.11ms + 0ms (from glue) lookup on c.ns.facebook.com.(185.89.218.12)
  - 69 bytes in 1.04ms + 0ms (from glue) lookup on b.ns.facebook.com.(129.134.31.12)
  - 69 bytes in 169.63ms + 0ms (from glue) lookup on a.ns.facebook.com.(129.134.30.12)
  - 69 bytes in 206.83ms + 0ms (from glue) lookup on d.ns.facebook.com.(185.89.219.12)

;; Cold best path time: 152.879841ms

facebook.com.   300     IN      A       31.13.68.35

@rs rs merged commit e6b42f9 into rs:master Sep 22, 2022
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@kokizzu @rs