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Properly align synctrack.SingleFileTracker struct

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count is used with atomic operations so it must be 64-bit aligned,
otherwise atomic operations will panic. Having it at the top of the
struct will guarantee that, even on 32-bit arches.

This fixes panics like that one observed in kube-apiserver:

    E0310 13:48:47.476124     676 runtime.go:77] Observed a panic: unaligned 64-bit atomic operation
    goroutine 141 [running]:
    k8s.io/apimachinery/pkg/util/runtime.logPanic({0x2482378, 0x2db2ff8})
    	vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:75 +0x94
    k8s.io/apimachinery/pkg/util/runtime.HandleCrash({0x0, 0x0, 0x0})
    	vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:49 +0x78
    panic({0x2482378, 0x2db2ff8})
    	/usr/local/go/src/runtime/panic.go:884 +0x218
    runtime/internal/atomic.panicUnaligned()
    	/usr/local/go/src/runtime/internal/atomic/unaligned.go:8 +0x24
    runtime/internal/atomic.Load64(0x685f794)
    	/usr/local/go/src/runtime/internal/atomic/atomic_arm.s:280 +0x14
    k8s.io/client-go/tools/cache/synctrack.(*SingleFileTracker).HasSynced(0x685f790)
    	vendor/k8s.io/client-go/tools/cache/synctrack/synctrack.go:115 +0x3c
    k8s.io/client-go/tools/cache.(*processorListener).HasSynced(0x6013e60)
    	vendor/k8s.io/client-go/tools/cache/shared_informer.go:907 +0x20
    k8s.io/client-go/tools/cache.WaitForCacheSync.func1()
    	vendor/k8s.io/client-go/tools/cache/shared_informer.go:332 +0x50
    k8s.io/apimachinery/pkg/util/wait.ConditionFunc.WithContext.func1({0x2dcf274, 0x607c600})
    	vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:222 +0x1c
    k8s.io/apimachinery/pkg/util/wait.runConditionWithCrashProtectionWithContext({0x2dcf274, 0x607c600}, 0x6382050)
    	vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:262 +0x64
    k8s.io/apimachinery/pkg/util/wait.waitForWithContext({0x2dcf274, 0x607c600}, 0x64a6060, 0x6382050)
    	vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:649 +0x11c
    k8s.io/apimachinery/pkg/util/wait.poll({0x2dcf274, 0x607c600}, 0x1, 0x64a6060, 0x6382050)
    	vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:600 +0xc4
    k8s.io/apimachinery/pkg/util/wait.PollImmediateUntilWithContext({0x2dcf274, 0x607c600}, 0x5f5e100, 0x6382050)
    	vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:551 +0x60
    k8s.io/apimachinery/pkg/util/wait.PollImmediateUntil(0x5f5e100, 0x6298020, 0x607c600)
    	vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:542 +0x48
    k8s.io/client-go/tools/cache.WaitForCacheSync(0x607c600, {0x6298000, 0x3, 0x3})
    	vendor/k8s.io/client-go/tools/cache/shared_informer.go:329 +0x80
    k8s.io/client-go/tools/cache.WaitForNamedCacheSync({0x283c5e1, 0xf}, 0x607c600, {0x6298000, 0x3, 0x3})
    	vendor/k8s.io/client-go/tools/cache/shared_informer.go:316 +0xe8
    created by k8s.io/kubernetes/plugin/pkg/auth/authorizer/node.AddGraphEventHandlers
    	plugin/pkg/auth/authorizer/node/graph_populator.go:65 +0x5b0
    panic: unaligned 64-bit atomic operation [recovered]
    	panic: unaligned 64-bit atomic operation

    goroutine 141 [running]:
    k8s.io/apimachinery/pkg/util/runtime.HandleCrash({0x0, 0x0, 0x0})
    	vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:56 +0xf4
    panic({0x2482378, 0x2db2ff8})
    	/usr/local/go/src/runtime/panic.go:884 +0x218
    runtime/internal/atomic.panicUnaligned()
    	/usr/local/go/src/runtime/internal/atomic/unaligned.go:8 +0x24
    runtime/internal/atomic.Load64(0x685f794)
    	/usr/local/go/src/runtime/internal/atomic/atomic_arm.s:280 +0x14
    k8s.io/client-go/tools/cache/synctrack.(*SingleFileTracker).HasSynced(0x685f790)
    	vendor/k8s.io/client-go/tools/cache/synctrack/synctrack.go:115 +0x3c
    k8s.io/client-go/tools/cache.(*processorListener).HasSynced(0x6013e60)
    	vendor/k8s.io/client-go/tools/cache/shared_informer.go:907 +0x20
    k8s.io/client-go/tools/cache.WaitForCacheSync.func1()
    	vendor/k8s.io/client-go/tools/cache/shared_informer.go:332 +0x50
    k8s.io/apimachinery/pkg/util/wait.ConditionFunc.WithContext.func1({0x2dcf274, 0x607c600})
    	vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:222 +0x1c
    k8s.io/apimachinery/pkg/util/wait.runConditionWithCrashProtectionWithContext({0x2dcf274, 0x607c600}, 0x6382050)
    	vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:262 +0x64
    k8s.io/apimachinery/pkg/util/wait.waitForWithContext({0x2dcf274, 0x607c600}, 0x64a6060, 0x6382050)
    	vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:649 +0x11c
    k8s.io/apimachinery/pkg/util/wait.poll({0x2dcf274, 0x607c600}, 0x1, 0x64a6060, 0x6382050)
    	vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:600 +0xc4
    k8s.io/apimachinery/pkg/util/wait.PollImmediateUntilWithContext({0x2dcf274, 0x607c600}, 0x5f5e100, 0x6382050)
    	vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:551 +0x60
    k8s.io/apimachinery/pkg/util/wait.PollImmediateUntil(0x5f5e100, 0x6298020, 0x607c600)
    	vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:542 +0x48
    k8s.io/client-go/tools/cache.WaitForCacheSync(0x607c600, {0x6298000, 0x3, 0x3})
    	vendor/k8s.io/client-go/tools/cache/shared_informer.go:329 +0x80
    k8s.io/client-go/tools/cache.WaitForNamedCacheSync({0x283c5e1, 0xf}, 0x607c600, {0x6298000, 0x3, 0x3})
    	vendor/k8s.io/client-go/tools/cache/shared_informer.go:316 +0xe8
    created by k8s.io/kubernetes/plugin/pkg/auth/authorizer/node.AddGraphEventHandlers
    	plugin/pkg/auth/authorizer/node/graph_populator.go:65 +0x5b0
This commit is contained in:
Tom Wieczorek 2023-03-13 08:37:13 +01:00
parent ca7804fe13
commit ffcf653e06
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GPG Key ID: FE33A2282371E831
1 changed files with 6 additions and 2 deletions
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8
staging/src/k8s.io/client-go/tools/cache/synctrack/synctrack.go vendored
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@ -78,9 +78,13 @@ func (t *AsyncTracker[T]) HasSynced() bool {
// SingleFileTracker helps propagate HasSynced when events are processed in
// order (i.e. via a queue).
type SingleFileTracker struct {
UpstreamHasSynced func() bool
// Important: count is used with atomic operations so it must be 64-bit
// aligned, otherwise atomic operations will panic. Having it at the top of
// the struct will guarantee that, even on 32-bit arches.
// See https://pkg.go.dev/sync/atomic#pkg-note-BUG for more information.
count int64
UpstreamHasSynced func() bool
}
// Start should be called prior to processing each key which is part of the