Fix a panic related to batch GC #4903
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Test case that reproduces a panic with the following stacktrace: ``` panic: runtime error: invalid memory address or nil pointer dereference [recovered] panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x38 pc=0x1149715] goroutine 35 [running]: testing.tRunner.func1(0xc0001e2200) /usr/local/Cellar/go/1.11.2/libexec/src/testing/testing.go:792 +0x387 panic(0x167e400, 0x1c43a30) /usr/local/Cellar/go/1.11.2/libexec/src/runtime/panic.go:513 +0x1b9 github.com/hashicorp/nomad/vendor/github.com/hashicorp/go-immutable-radix.(*Iterator).Next(0xc0003a4080, 0x17f7ba0, 0x0, 0xc0002e74a0, 0xc0003a0510, 0xc0003a0530, 0xc0003a0530) /go/src/github.com/hashicorp/nomad/vendor/github.com/hashicorp/go-immutable-radix/iter.go:81 +0xa5 github.com/hashicorp/nomad/vendor/github.com/hashicorp/go-memdb.(*radixIterator).Next(0xc0003a0420, 0x1756059, 0xb) /go/src/github.com/hashicorp/nomad/vendor/github.com/hashicorp/go-memdb/txn.go:634 +0x2e github.com/hashicorp/nomad/nomad/state.(*StateStore).deleteJobVersions(0xc00028f7d0, 0x2711, 0xc0002e7680, 0xc000392100, 0xc0003a4040, 0x0) /go/src/github.com/hashicorp/nomad/nomad/state/state_store.go:1130 +0x1a1 github.com/hashicorp/nomad/nomad/state.(*StateStore).DeleteJobTxn(0xc00028f7d0, 0x2711, 0x175334f, 0x7, 0xc000306810, 0x2f, 0xc000392100, 0x0, 0x0) /go/src/github.com/hashicorp/nomad/nomad/state/state_store.go:1102 +0x46c github.com/hashicorp/nomad/nomad/state.TestStateStore_DeleteJobTxn_BatchDeletes.func1(0xc000392100, 0x1777ce0, 0xc000392100) /go/src/github.com/hashicorp/nomad/nomad/state/state_store_test.go:1705 +0x1a2 github.com/hashicorp/nomad/nomad/state.(*StateStore).WithWriteTransaction(0xc00028f7d0, 0xc0000d5e48, 0x0, 0x0) /go/src/github.com/hashicorp/nomad/nomad/state/state_store.go:3953 +0x79 github.com/hashicorp/nomad/nomad/state.TestStateStore_DeleteJobTxn_BatchDeletes(0xc0001e2200) /go/src/github.com/hashicorp/nomad/nomad/state/state_store_test.go:1703 +0x685 testing.tRunner(0xc0001e2200, 0x1777138) /usr/local/Cellar/go/1.11.2/libexec/src/testing/testing.go:827 +0xbf created by testing.(*T).Run /usr/local/Cellar/go/1.11.2/libexec/src/testing/testing.go:878 +0x353 ```
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`deleteJobVersions` does concurrent modifications to iterated items while iterating, by deleting job versions while it's iterating on them,
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Confirmed that the panic occurred in https://travis-ci.org/hashicorp/nomad/jobs/457262238 against the test sha before the fix: https://travis-ci.org/hashicorp/nomad/jobs/457262238 |
preetapan
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Fix a panic related to batch GC
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I'm going to lock this pull request because it has been closed for 120 days ⏳. This helps our maintainers find and focus on the active contributions. |
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deleteJobVersionsdeletes job versions while it's iterating on them.This seems to cause a panic eventually.
I am able to reliably reproduce the panic in a test environment where I
spin up multiple batch jobs and run
curl -XPUT http://localhost:4646/v1/system/gc, and confirmed that thepanic doesn't occur with this patch.
Yet, I am unable to capture theI have been able to reproduce it reliably in test in the PR.case in a unit/integration test sadly.