Note: This issue was automatically generated by AI-Test-Triage. Please review and triage accordingly.
Build Information
Build: 20251211.1, 20251211.4, 20251212.1, 20251212.3, 20251214.1, 20251214.2, 20251215.1, 20251215.3, 20251216.1, 20251217.1, 20251218.1, 20260104.1, 20260119.1, 20260119.4, 20260120.1, 20260120.8
Build error leg or test failing: System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs, System.Net.NameResolution.Functional.Tests.WorkItemExecution
Affected CI jobs: tvos_arm64_Release_AllSubsets_Mono, build_tvOS_arm64_Release_AllSubsets_Mono
Causing Commit Range Information
Commit range: View Changes
Summary
- Name-resolution tests fail Assert.All because localhost resolves to non-loopback addresses, causing items flagged 'Not a loopback address'.
- Failures occur on tvOS arm64 Mono jobs (tvos_arm64_Release_AllSubsets_Mono, build_tvOS_arm64_Release_AllSubsets_Mono) run via XHarness/Helix.
- Resolved addresses observed include IPv6 link-local (fe80::/10 with scope IDs), IPv6 unique-local (fd00::/8), IPv4 link-local (169.254.0.0/16), and RFC1918 private IPv4 (10.0.0.0/8).
- AOT precompilation fails during publish with exit code 134 and 'Invalid IL code' messages; test harness reports XHarness exit code 1 and Helix work item exit code -1.
- Pattern indicates platform DNS/environment returns local/private interfaces for 'localhost' instead of loopback, pointing to an infrastructure/environment issue.
Failure Statistics
Note: These statistics are based on the configured time range and might not reflect the full history of the failure.
- Occurrence Count: 21
- First Failure: 2025-12-11 09:00:00 UTC
- Last Failure: 2026-01-21 03:02:39 UTC
Work Items
Showing 10 most recent of 21 occurrences
| Work Item |
Console Log |
Build |
Job Name |
| System.Net.NameResolution.Functional.Tests |
View Extract[08:06:43.8681520] 2026-01-04 05:06:43.896 System.Net.NameResolution.Functional.Tests[8825:9415460] [FAIL] System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs(mode: 2)
[08:06:43.8682140] Assert.All() Failure: 21 out of 23 items in the collection did not pass.
[08:06:43.8682460] [2]: Item: fe80::184d:e41b:a98b:9203%3
[08:06:43.8682790] 2026-01-04 05:06:43.896 System.Net.NameResolution.Functional.Tests[8825:9415460] Error: Not a loopback address: fe80::184d:e41b:a98b:9203%3
[08:06:43.8683230] [3]: Item: 2001:4898:502:3:474:1ebb:ea10:fa10
[08:06:43.8683870] Error: Not a loopback address: 2001:4898:502:3:474:1ebb:ea10:fa10
[08:06:43.8684110] [4]: Item: 10.64.36.133
[08:06:43.8684240] Error: Not a loopback address: 10.64.36.133
[08:06:43.8700640] [5]: Item: 2001:4898:502:3:4910:9e0f:bfc0:abe8
[08:06:43.8700990] Error: Not a loopback address: 2001:4898:502:3:4910:9e0f:bfc0:abe8
...
[08:06:43.8703420] [18]: Item: 169.254.53.140
[08:06:43.8703490] Error: Not a loopback address: 169.254.53.140
[08:06:43.8703560] [19]: Item: fe80::f8b3:c0ff:fe08:e58a%11
[08:06:43.8703620] Error: Not a loopback address: fe80::f8b3:c0ff:fe08:e58a%11
[08:06:43.8703690] [20]: Item: fe80::f8b3:c0ff:fe08:e58a%12
[08:06:43.8703770] Error: Not a loopback address: fe80::f8b3:c0ff:fe08:e58a%12
[08:06:43.8703840] [21]: Item: fe80::46c6:5dff:fe65:7b8%13
[08:06:43.8703900] Error: Not a loopback address: fe80::46c6:5dff:fe65:7b8%13
[08:06:43.8703960] [22]: Item: fd19:7064:616b::1
[08:06:43.8704060] Error: Not a loopback address: fd19:7064:616b::1
[08:06:43.8704170] --- End of stack trace from previous location --- |
20260104.1 |
tvos_arm64_Release_AllSubsets_Mono |
| System.Net.NameResolution.Functional.Tests |
View Extract2026-01-19 02:26:19.537 System.Net.NameResolution.Functional.Tests[5618:3854647] [FAIL] System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs(mode: 2)
Assert.All() Failure: 21 out of 23 items in the collection did not pass.
[2]: Item: fe80::128b:69e6:1241:50ac%3
Error: Not a loopback address: fe80::128b:69e6:1241:50ac%3
[3]: Item: fe80::81b1:fa6d:3c2b:b373%4
Error: Not a loopback address: fe80::81b1:fa6d:3c2b:b373%4
[4]: Item: fe80::ce81:b1c:bd2c:69e%5
Error: Not a loopback address: fe80::ce81:b1c:bd2c:69e%5
...
[18]: Item: 169.254.58.28
Error: Not a loopback address: 169.254.58.28
[21]: Item: fe80::e289:7eff:fe70:c0e8%13
Error: Not a loopback address: fe80::e289:7eff:fe70:c0e8%13
[22]: Item: fd8c:d9bf:4152::1
Error: Not a loopback address: fd8c:d9bf:4152::1
at System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs(Int32 mode) |
20260119.1 |
tvos_arm64_Release_AllSubsets_Mono |
| System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs |
View Extract[05:26:19.4846500] 2026-01-19 02:26:19.537 System.Net.NameResolution.Functional.Tests[5618:3854647] [FAIL] System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs(mode: 2)
[05:26:19.4846880] Assert.All() Failure: 21 out of 23 items in the collection did not pass.
[05:26:19.4846960] [2]: Item: fe80::128b:69e6:1241:50ac%3
[05:26:19.4847070] Error: Not a loopback address: fe80::128b:69e6:1241:50ac%3
[05:26:19.4847330] [3]: Item: fe80::81b1:fa6d:3c2b:b373%4
[05:26:19.4847410] Error: Not a loopback address: fe80::81b1:fa6d:3c2b:b373%4
[05:26:19.4860250] [5]: Item: fe80::8aa:589c:f395:739a%6
[05:26:19.4862830] [18]: Item: 169.254.58.28
[05:26:19.4862980] Error: Not a loopback address: 169.254.58.28
[05:26:19.4863180] [20]: Item: fe80::785a:eff:fec6:563f%12
[05:26:19.4863320] [21]: Item: fe80::e289:7eff:fe70:c0e8%13
[05:26:19.4863420] Error: Not a loopback address: fe80::e289:7eff:fe70:c0e8%13
[05:26:19.4863480] [22]: Item: fd8c:d9bf:4152::1
[05:26:19.4873850] 2026-01-19 02:26:19.538 System.Net.NameResolution.Functional.Tests[5618:3854647] at System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs(Int32 mode) |
20260119.1 |
build_tvOS_arm64_Release_AllSubsets_Mono |
| System.Net.NameResolution.Functional.Tests Work Item |
View Extract[05:26:19.4846500] 2026-01-19 02:26:19.537 System.Net.NameResolution.Functional.Tests[5618:3854647] [FAIL] System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs(mode: 2)
[05:26:19.4846880] Assert.All() Failure: 21 out of 23 items in the collection did not pass.
[05:26:19.4846960] [2]: Item: fe80::128b:69e6:1241:50ac%3
[05:26:19.4847070] Error: Not a loopback address: fe80::128b:69e6:1241:50ac%3
[05:26:19.4847330] [3]: Item: fe80::81b1:fa6d:3c2b:b373%4
[05:26:19.4847410] Error: Not a loopback address: fe80::81b1:fa6d:3c2b:b373%4
...
[05:29:12] info: Application 'net.dot.System.Net.NameResolution.Functional.Tests' was uninstalled successfully
XHarness exit code: 1 (TESTS_FAILED)
...
/tmp/helix/working/A5640988/p/build/apple/AppleBuild.targets(260,5): error : Precompiling failed for /tmp/helix/working/A5640988/w/A8570911/e/publish/aot-instances.dll with exit code 134.
/tmp/helix/working/A5640988/p/build/apple/AppleBuild.targets(260,5): error : Unable to compile method 'System.Threading.Tasks.Task1<int> SimpleTestRunner:Main (string[])' due to: 'Invalid IL code in SimpleTestRunner:Main (string[]): IL_0000: ret'<br/>/tmp/helix/working/A5640988/p/build/apple/AppleBuild.targets(260,5): error : Unable to compile method 'System.Collections.Generic.IEnumerable1<Microsoft.DotNet.XHarness.TestRunners.Common.TestAssemblyInfo> SimpleTestRunner:GetTestAssemblies ()' due to: 'Invalid IL code in SimpleTestRunner:GetTestAssemblies (): IL_0000: ret'
|
20260119.1 |
build_tvOS_arm64_Release_AllSubsets_Mono |
| System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs |
View Extract[17:25:17] dbug: [17:25:04.0921110] 2026-01-19 14:25:04.153 System.Net.NameResolution.Functional.Tests[1997:2285250] [FAIL] System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs(mode: 2)
[17:25:17] dbug: [17:25:04.0921620] Assert.All() Failure: 21 out of 23 items in the collection did not pass.
[17:25:17] dbug: [17:25:04.0921740] [2]: Item: fe80::c45:ddc8:43ec:bbed%3
[17:25:17] dbug: [17:25:04.0947400] 2026-01-19 14:25:04.153 System.Net.NameResolution.Functional.Tests[1997:2285250] Error: Not a loopback address: fe80::c45:ddc8:43ec:bbed%3
[17:25:17] dbug: [17:25:04.0947900] [3]: Item: 10.64.36.108
[17:25:17] dbug: [17:25:04.0948030] Error: Not a loopback address: 10.64.36.108
[17:25:17] dbug: [17:25:04.0948120] [4]: Item: 2001:4898:502:3:1004:89c5:52cd:475a
[17:25:17] dbug: [17:25:04.0948210] Error: Not a loopback address: 2001:4898:502:3:1004:89c5:52cd:475a
...
[17:25:17] dbug: [17:25:04.0951940] 2026-01-19 14:25:04.154 System.Net.NameResolution.Functional.Tests[1997:2285250] at System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs(Int32 mode)
[17:25:17] dbug: [17:25:04.1057970] 2026-01-19 14:25:04.167 System.Net.NameResolution.Functional.Tests[1997:2285255] [FAIL] System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs(mode: 1)
[17:25:17] dbug: [17:25:04.1148800] 2026-01-19 14:25:04.176 System.Net.NameResolution.Functional.Tests[1997:2285255] [FAIL] System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs(mode: 0)
...
[17:25:17] dbug: [17:25:04.5355340] Tests run: 88 Passed: 59 Inconclusive: 0 Failed: 3 Ignored: 10 Skipped: 16
[17:25:17] dbug: [17:25:04.5365940] Killing process 80834 as it was cancelled |
20260119.4 |
build_tvOS_arm64_Release_AllSubsets_Mono |
| System.Net.NameResolution.Functional.Tests Work Item |
View Extract[17:25:04.0921110] 2026-01-19 14:25:04.153 System.Net.NameResolution.Functional.Tests[1997:2285250] [FAIL] System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs(mode: 2)
[17:25:04.0921620] Assert.All() Failure: 21 out of 23 items in the collection did not pass.
[17:25:04.0921740] [2]: Item: fe80::c45:ddc8:43ec:bbed%3
[17:25:04.0947400] 2026-01-19 14:25:04.153 System.Net.NameResolution.Functional.Tests[1997:2285250] Error: Not a loopback address: fe80::c45:ddc8:43ec:bbed%3
[17:25:04.0947900] [3]: Item: 10.64.36.108
[17:25:04.0948030] Error: Not a loopback address: 10.64.36.108
...
/tmp/helix/working/AB6708FC/p/build/apple/AppleBuild.targets(260,5): error : Precompiling failed for /tmp/helix/working/AB6708FC/w/B73F09ED/e/publish/aot-instances.dll with exit code 134. [/private/tmp/helix/working/AB6708FC/w/B73F09ED/e/publish/ProxyProjectForAOTOnHelix.proj]
/tmp/helix/working/AB6708FC/p/build/apple/AppleBuild.targets(260,5): error : Unable to compile method 'System.Threading.Tasks.Task`1<int> SimpleTestRunner:Main (string[])' due to: 'Invalid IL code in SimpleTestRunner:Main (string[]): IL_0000: ret'
...
XHarness exit code: 1 (TESTS_FAILED)
+ exit_code=1
+ '[' -f /tmp/helix/working/AB6708FC/w/B73F09ED/e/.retry ']'
+ '[' -f /tmp/helix/working/AB6708FC/w/B73F09ED/e/.reboot ']' |
20260119.4 |
build_tvOS_arm64_Release_AllSubsets_Mono |
| System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs |
View Extract[05:57:25.4377320] 2026-01-20 02:57:25.474 System.Net.NameResolution.Functional.Tests[5605:4112339] [FAIL] System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs(mode: 2)
[05:57:25.4377790] Assert.All() Failure: 21 out of 23 items in the collection did not pass.
[05:57:25.4377910] [2]: Item: fe80::f0fd:a5e4:ac34:7b40%3
[05:57:25.4398310] Error: Not a loopback address: fe80::f0fd:a5e4:ac34:7b40%3
[05:57:25.4398810] [3]: Item: fe80::7869:af45:f20f:cfde%4
[05:57:25.4398960] Error: Not a loopback address: fe80::7869:af45:f20f:cfde%4
[05:57:25.4400160] [6]: Item: 10.64.33.53
...
[05:57:25.4402610] [19]: Item: fe80::83c:d810:6336:1776%12
[05:57:25.4402740] Error: Not a loopback address: 169.254.203.88
[05:57:25.4402930] [22]: Item: fde4:d86e:3179::1
[05:57:25.4403030] Error: Not a loopback address: fde4:d86e:3179::1
[05:57:25.4495950] [FAIL] System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs(mode: 1)
...
[05:59:31.7878520] Failed tests:
[05:59:31.7899450] 1) [FAIL] System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs(mode: 2)
[05:59:31.7920890] Execution time: 0.0224901
[05:59:31.7958020] Execution time: 0.0032004
[05:59:31.8162140] Tests run: 88 Passed: 59 Inconclusive: 0 Failed: 3 Ignored: 10 Skipped: 16
[05:59:31.8170440] Killing process 1081 as it was cancelled |
20260120.1 |
build_tvOS_arm64_Release_AllSubsets_Mono |
| System.Net.NameResolution.Functional.Tests Work Item |
View Extract[05:57:25.4377320] 2026-01-20 02:57:25.474 System.Net.NameResolution.Functional.Tests[5605:4112339] [FAIL] System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs(mode: 2)
[05:57:25.4377790] Assert.All() Failure: 21 out of 23 items in the collection did not pass.
[05:57:25.4377910] [2]: Item: fe80::f0fd:a5e4:ac34:7b40%3
[05:57:25.4398310] 2026-01-20 02:57:25.474 System.Net.NameResolution.Functional.Tests[5605:4112339] Error: Not a loopback address: fe80::f0fd:a5e4:ac34:7b40%3
[05:57:25.4398810] [3]: Item: fe80::7869:af45:f20f:cfde%4
[05:57:25.4398960] Error: Not a loopback address: fe80::7869:af45:f20f:cfde%4
...
[05:59:48] info: Application 'net.dot.System.Net.NameResolution.Functional.Tests' was uninstalled successfully
XHarness exit code: 1 (TESTS_FAILED)
Process mlaunch exited with 0
/ tmp/helix/working/.../publish/aot-instances.dll
/tmp/helix/working/.../AppleBuild.targets(260,5): error : Precompiling failed for .../aot-instances.dll with exit code 134.
/tmp/helix/working/.../AppleBuild.targets(260,5): error : Unable to compile method 'System.Threading.Tasks.Task`1<int> SimpleTestRunner:Main (string[])' due to: 'Invalid IL code ... IL_0000: ret'
|
20260120.1 |
build_tvOS_arm64_Release_AllSubsets_Mono |
| System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs |
View Extract[19:56:50.5403190] 2026-01-20 16:56:50.569 System.Net.NameResolution.Functional.Tests[3192:2310868] [FAIL] System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs(mode: 2)
[19:56:50.5403680] Assert.All() Failure: 21 out of 23 items in the collection did not pass.
[19:56:50.5403820] [2]: Item: fe80::14a7:22fc:d858:e48%3
[19:56:50.5403970] Error: Not a loopback address: fe80::14a7:22fc:d858:e48%3
[19:56:50.5404330] [3]: Item: 2001:4898:502:3:10b2:e700:de63:b67c
[19:56:50.5404640] Error: Not a loopback address: 2001:4898:502:3:10b2:e700:de63:b67c
[19:56:50.5404960] [4]: Item: 10.64.36.76
[19:56:50.5405160] Error: Not a loopback address: 10.64.36.76
...
[19:56:56.2810600] 2026-01-20 16:56:56.311 System.Net.NameResolution.Functional.Tests[3192:2310964] Failed tests:
[19:56:56.2826790] 2026-01-20 16:56:56.312 System.Net.NameResolution.Functional.Tests[3192:2310964] 1) [FAIL] System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs (mode: 2)
[19:56:56.2933160] === TEST EXECUTION SUMMARY ===
[19:56:56.3146660] Tests run: 88 Passed: 59 Inconclusive: 0 Failed: 3 Ignored: 10 Skipped: 16 |
20260120.8 |
build_tvOS_arm64_Release_AllSubsets_Mono |
| System.Net.NameResolution.Functional.Tests Work Item |
View Extract[19:56:50.5179600] 2026-01-20 16:56:50.547 System.Net.NameResolution.Functional.Tests[3192:2310863] [PASS] System.Net.NameResolution.Tests.GetHostEntryTest.Dns_GetHostEntryAsync_IPString_Ok
[19:56:50.5403190] 2026-01-20 16:56:50.569 System.Net.NameResolution.Functional.Tests[3192:2310868] [FAIL] System.Net.NameResolution.Tests.GetHostEntryTest.DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs(mode: 2)
[19:56:50.5403680] Assert.All() Failure: 21 out of 23 items in the collection did not pass.
[19:56:50.5403820] [2]: Item: fe80::14a7:22fc:d858:e48%3
[19:56:50.5403970] 2026-01-20 16:56:50.570 System.Net.NameResolution.Functional.Tests[3192:2310868] Error: Not a loopback address: fe80::14a7:22fc:d858:e48%3
[19:56:50.5404210] [3]: Item: 2001:4898:502:3:10b2:e700:de63:b67c
[19:56:50.5404330] Error: Not a loopback address: 2001:4898:502:3:10b2:e700:de63:b67c
...
[19:57:11] info: Application 'net.dot.System.Net.NameResolution.Functional.Tests' was uninstalled successfully
[19:57:11] dbug: Saving diagnostics data to '/tmp/helix/working/B0580958/w/981108BD/e/diagnostics.json'
XHarness exit code: 1 (TESTS_FAILED)
...
/tmp/helix/working/B0580958/p/build/apple/AppleBuild.targets(260,5): error : Precompiling failed for /tmp/helix/working/B0580958/w/981108BD/e/publish/aot-instances.dll with exit code 134.
/tmp/helix/working/B0580958/p/build/apple/AppleBuild.targets(260,5): error : Unable to compile method 'System.Threading.Tasks.Task1<int> SimpleTestRunner:Main (string[])' due to: 'Invalid IL code in SimpleTestRunner:Main (string[]): IL_0000: ret'<br/>/tmp/helix/working/B0580958/p/build/apple/AppleBuild.targets(260,5): error : Unable to compile method 'System.Collections.Generic.IEnumerable1<Microsoft.DotNet.XHarness.TestRunners.Common.TestAssemblyInfo> SimpleTestRunner:GetTestAssemblies ()' due to: 'Invalid IL code in SimpleTestRunner:GetTestAssemblies (): IL_0000: ret'
|
20260120.8 |
build_tvOS_arm64_Release_AllSubsets_Mono |
Error Message
{
"ErrorMessage": "Error: Not a loopback address",
"BuildRetry": false,
"ExcludeConsoleLog": false
}Report
Summary
| 24-Hour Hit Count |
7-Day Hit Count |
1-Month Count |
| 0 |
0 |
0 |
Report
Summary
| 24-Hour Hit Count |
7-Day Hit Count |
1-Month Count |
| 0 |
2 |
55 |
