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Avoid NPE in nomad/command/job_restart.go (#20049)

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stopAlloc() checks if an allocation represents a system job like this:
```
  if *alloc.Job.Type == api.JobTypeSystem {
    ...
  }
```

This caused the cli to crash:
```
==> 2024-02-29T08:45:53+01:00: Restarting 2 allocations
    2024-02-29T08:45:54+01:00: Rescheduling allocation "6a9da11a" for group "redacted-group"
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x20 pc=0x10686affc]

goroutine 36 [running]:
github.com/hashicorp/nomad/command.(*JobRestartCommand).stopAlloc(0x14000b11040, {0x14000996dc0?, 0x0?})
        github.com/hashicorp/nomad/command/job_restart.go:968 +0x25c
github.com/hashicorp/nomad/command.(*JobRestartCommand).handleAlloc(0x14000b11040, {0x14000996dc0?, 0x0?})
        github.com/hashicorp/nomad/command/job_restart.go:868 +0x34
github.com/hashicorp/nomad/command.(*JobRestartCommand).Run.(*JobRestartCommand).Run.func1.func2()
        github.com/hashicorp/nomad/command/job_restart.go:392 +0x28
github.com/hashicorp/go-multierror.(*Group).Go.func1()
        github.com/hashicorp/go-multierror@v1.1.1/group.go:23 +0x60
created by github.com/hashicorp/go-multierror.(*Group).Go in goroutine 1
        github.com/hashicorp/go-multierror@v1.1.1/group.go:20 +0x84
```

Attaching a debugger revealed that `alloc.Job` was set, but
`alloc.Job.Type` was nil. After guarding the `.Type` check with a
`alloc.Job.Type != nil`, it still crashed. This time, `alloc.Job` was
nil.

I was scrambling to get the job running again, so I didn't have the
opportunity to find out why those values were nil, but this change
ensures the CLI does not crash in these situations.

Fixes #20048
This commit is contained in:
Soren L. Hansen
2024-03-01 15:07:28 +01:00
committed by GitHub
parent a66f7ba888
commit 96acddbc13
2 changed files with 10 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
.changelog/20049.txt Normal file
View File

@@ -0,0 +1,3 @@
```release-note:bug
cli: Fixed a bug where the `nomad job restart` command could crash if the job type was not present in a response from the server
```

8
command/job_restart.go
View File

@@ -965,7 +965,7 @@ func (c *JobRestartCommand) stopAlloc(alloc AllocationListStubWithJob) error {
// Allocations for system jobs do not get replaced by the scheduler after
// being stopped, so an eval is needed to trigger the reconciler.
if *alloc.Job.Type == api.JobTypeSystem {
if alloc.isSystemJob() {
opts := api.EvalOptions{
ForceReschedule: true,
}
@@ -1241,3 +1241,9 @@ func (a *AllocationListStubWithJob) IsRunning() bool {
return a.ClientStatus == api.AllocClientStatusRunning ||
a.DesiredStatus == api.AllocDesiredStatusRun
}
// isSystemJob returns true if allocation's job type
// is "system", false otherwise
func (a *AllocationListStubWithJob) isSystemJob() bool {
return a.Job != nil && a.Job.Type != nil && *a.Job.Type == api.JobTypeSystem
}