Goroutine leak in storage code

[juliusv]

I just hard-quit a Prometheus and it produced a stack dump with gazillions of goroutines running in LevelDB storage code. An excerpt:

[...]
goroutine 101627 [runnable]:
github.com/prometheus/prometheus/storage/metric.func·014(0xc26823fa00, 0x14, 0x20)
    /home/julius/gosrc/src/github.com/prometheus/prometheus/storage/metric/leveldb.go:214
created by github.com/prometheus/prometheus/storage/metric.groupByFingerprint
    /home/julius/gosrc/src/github.com/prometheus/prometheus/storage/metric/leveldb.go:219 +0x3d7

goroutine 101626 [runnable]:
github.com/prometheus/prometheus/storage/metric.func·014(0xc20934e500, 0x14, 0x20)
    /home/julius/gosrc/src/github.com/prometheus/prometheus/storage/metric/leveldb.go:214
created by github.com/prometheus/prometheus/storage/metric.groupByFingerprint
    /home/julius/gosrc/src/github.com/prometheus/prometheus/storage/metric/leveldb.go:219 +0x3d7

goroutine 101625 [runnable]:
github.com/prometheus/prometheus/storage/metric.func·014(0xc279106000, 0x28, 0x40)
    /home/julius/gosrc/src/github.com/prometheus/prometheus/storage/metric/leveldb.go:214
created by github.com/prometheus/prometheus/storage/metric.groupByFingerprint
    /home/julius/gosrc/src/github.com/prometheus/prometheus/storage/metric/leveldb.go:219 +0x3d7

goroutine 101624 [running]:
github.com/prometheus/prometheus/storage/metric.func·014(0xc259863000, 0x14, 0x20)
    /home/julius/gosrc/src/github.com/prometheus/prometheus/storage/metric/leveldb.go:214
created by github.com/prometheus/prometheus/storage/metric.groupByFingerprint
    /home/julius/gosrc/src/github.com/prometheus/prometheus/storage/metric/leveldb.go:219 +0x3d7
rax     0xca
rbx     0xffffffffffffffff
rcx     0xffffffffffffffff
rdx     0x0
rdi     0xce9038
rsi     0x0
rbp     0xc2000cc000
rsp     0x7fff77115da0
r8      0x0
r9      0x0
r10     0x0
r11     0x246
r12     0x78f600
r13     0x550
r14     0x10
r15     0x821810
rip     0x42a941
rflags  0x246
cs      0x33
fs      0x0
gs      0x0
make: *** [run] Error 2

Looks like a goroutine leak to me.

[matttproud-soundcloud]

@juliusv https://github.com/prometheus/prometheus/pull/new/feature/storage/fix-grouping#L0R210.

[lock]

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