Add retry around wclayer operations for process isolated containers #1091
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Should hopefully help #919 |
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@msscotb I did when trying to get the PrepareLayer issue to reproduce 😆 I got ERROR_DEVICE_NOT_CONNECTED |
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@msscotb Any other feedback for this? |
This change adds a simple retry loop to handle some behavior on RS5. Loopback VHDs used to be mounted in a different manor on RS5 (ws2019) which led to some very odd cases where things would succeed when they shouldn't have, or we'd simply timeout if an operation took too long. Many parallel invocations of this code path and stressing the machine seem to bring out the issues, but all of the possible failure paths that bring about the errors we have observed aren't known. On 19h1+ this retry loop shouldn't be needed, but the logic is to leave the loop if everything succeeded so this is harmless and shouldn't need a version check. Signed-off-by: Daniel Canter <dcanter@microsoft.com>
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Doesn't err need to be set to PrepareLayer result for the deferred DeactivateLayer to execute?
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Nope, if you have a named return value, e.g. (err error) then the return value of line 107 or the PrepareLayer call will get assigned to err after completion. So when defer runs it will have the return value of PrepareLayer to check against.
Here's a quick example: https://play.golang.org/p/cID3RHPwl88
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Related work items: microsoft#930, microsoft#962, microsoft#1004, microsoft#1008, microsoft#1039, microsoft#1045, microsoft#1046, microsoft#1047, microsoft#1052, microsoft#1053, microsoft#1054, microsoft#1057, microsoft#1058, microsoft#1060, microsoft#1061, microsoft#1063, microsoft#1064, microsoft#1068, microsoft#1069, microsoft#1070, microsoft#1071, microsoft#1074, microsoft#1078, microsoft#1079, microsoft#1081, microsoft#1082, microsoft#1083, microsoft#1084, microsoft#1088, microsoft#1090, microsoft#1091, microsoft#1093, microsoft#1094, microsoft#1096, microsoft#1098, microsoft#1099, microsoft#1102, microsoft#1103, microsoft#1105, microsoft#1106, microsoft#1108, microsoft#1109, microsoft#1115, microsoft#1116, microsoft#1122, microsoft#1123, microsoft#1126
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Add retry around wclayer operations for process isolated containers
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This change adds a simple retry loop to handle some behavior on RS5. Loopback VHDs
used to be mounted in a different manor on RS5 (ws2019) which led to some
very odd cases where things would succeed when they shouldn't have, or we'd simply
timeout if an operation took too long. Many parallel invocations of this code path
and stressing the machine seem to bring out the issues, but all of the possible failure
paths that bring about the errors we have observed aren't known.
On 19h1+ this retry loop shouldn't be needed, but the logic is to leave the loop if everything succeeded so this is harmless
and shouldn't need a version check.
Signed-off-by: Daniel Canter dcanter@microsoft.com