panic: runtime error: invalid memory address or nil pointer dereference

[dkropachev]

Running command "/$HOME/go/bin/scylla-bench -workload=sequential -mode=write -max-rate=300 -replication-factor=3 -partition-count=10 -clustering-row-count=100 -clustering-row-size=5120 -concurrency=7 -rows-per-request=10 -nodes 10.142.0.4"...
Configuration
Mode: write
Workload: sequential
Timeout: 5s
Consistency level: quorum
Partition count: 10
Clustering rows: 100
Clustering row size: Fixed(5120)
Rows per request: 10
Page size: 1000
Concurrency: 7
Connections: 4
Maximum rate: 300 op/s
Client compression: true

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x67abc8]

goroutine 132 [running]:
sync.(*Mutex).Lock(...)
/usr/local/go/src/sync/mutex.go:74
github.com/gocql/gocql.(*Session).routingKeyInfo(0x0, 0x7af5a0, 0xc00008e010, 0xc0000c1080, 0x3a, 0x0, 0x0, 0x0)
/home/scylla-test/go/src/github.com/gocql/gocql/session.go:495 +0x58
github.com/gocql/gocql.(*Batch).GetRoutingKey(0xc00048e0e0, 0x7f6b86f7cfff, 0x800, 0x7f6b86da2a00, 0x20300000000000, 0x7f6b86f7cfff)
/home/scylla-test/go/src/github.com/gocql/gocql/session.go:1774 +0xcf
github.com/gocql/gocql.(*tokenAwareHostPolicy).Pick(0xc0000c43f0, 0x7b2900, 0xc00048e0e0, 0x400)
/home/scylla-test/go/src/github.com/gocql/gocql/policies.go:575 +0x52
github.com/gocql/gocql.(*queryExecutor).do(0xc000084dc0, 0x7af5a0, 0xc00008e010, 0x7b2900, 0xc00048e0e0, 0x5b)
/home/scylla-test/go/src/github.com/gocql/gocql/query_executor.go:87 +0x63
github.com/gocql/gocql.(*queryExecutor).executeQuery(0xc000084dc0, 0x7b2900, 0xc00048e0e0, 0x0, 0x0, 0x0)
/home/scylla-test/go/src/github.com/gocql/gocql/query_executor.go:60 +0x437
github.com/gocql/gocql.(*Session).executeBatch(0xc000069880, 0xc00048e0e0, 0x1d6ea4013ff)
/home/scylla-test/go/src/github.com/gocql/gocql/session.go:642 +0xbc
github.com/gocql/gocql.(*Session).ExecuteBatch(0xc000069880, 0xc00048e0e0, 0x981f40, 0xc0002f86a0)
/home/scylla-test/go/src/github.com/gocql/gocql/session.go:653 +0x39
main.DoBatchedWrites.func1(0xc0002fa2c0, 0xc246cc00, 0x981f40, 0x9788e0)
/home/scylla-test/go/src/github.com/scylladb/scylla-bench/modes.go:453 +0x518
main.RunTest(0xc00019b440, 0x7b0840, 0xc00008b2c0, 0x7acd00, 0xc000205770, 0xc00024eea0)
/home/scylla-test/go/src/github.com/scylladb/scylla-bench/modes.go:268 +0x10c
main.DoBatchedWrites(0xc000069880, 0xc00019b440, 0x7b0840, 0xc00008b2c0, 0x7acd00, 0xc000205770)
/home/scylla-test/go/src/github.com/scylladb/scylla-bench/modes.go:440 +0x179
main.main.func4(0x1, 0xc00019b440, 0x7acd00, 0xc000205770)
/home/scylla-test/go/src/github.com/scylladb/scylla-bench/main.go:440 +0x145
main.RunConcurrently.func1(0xc000281020, 0xc0002a6d80, 0xc000290500, 0x7, 0x7, 0xc000281018, 0x1)
/home/scylla-test/go/src/github.com/scylladb/scylla-bench/modes.go:158 +0x73
created by main.RunConcurrently
/home/scylla-test/go/src/github.com/scylladb/scylla-bench/modes.go:156 +0x203
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x67abc8]

goroutine 135 [running]:
sync.(*Mutex).Lock(...)
/usr/local/go/src/sync/mutex.go:74
github.com/gocql/gocql.(*Session).routingKeyInfo(0x0, 0x7af5a0, 0xc00008e010, 0xc0002e6180, 0x3a, 0x0, 0x0, 0x0)
/home/scylla-test/go/src/github.com/gocql/gocql/session.go:495 +0x58
github.com/gocql/gocql.(*Batch).GetRoutingKey(0xc0002b61c0, 0x7f6b86f7cfff, 0x800, 0x7f6b86da2500, 0x20300000000000, 0x7f6b86f7cfff)
/home/scylla-test/go/src/github.com/gocql/gocql/session.go:1774 +0xcf
github.com/gocql/gocql.(*tokenAwareHostPolicy).Pick(0xc0000c43f0, 0x7b2900, 0xc0002b61c0, 0x400)
/home/scylla-test/go/src/github.com/gocql/gocql/policies.go:575 +0x52
github.com/gocql/gocql.(*queryExecutor).do(0xc000084dc0, 0x7af5a0, 0xc00008e010, 0x7b2900, 0xc0002b61c0, 0x5b)
/home/scylla-test/go/src/github.com/gocql/gocql/query_executor.go:87 +0x63
github.com/gocql/gocql.(*queryExecutor).executeQuery(0xc000084dc0, 0x7b2900, 0xc0002b61c0, 0x0, 0x0, 0x0)
/home/scylla-test/go/src/github.com/gocql/gocql/query_executor.go:60 +0x437
github.com/gocql/gocql.(*Session).executeBatch(0xc000069880, 0xc0002b61c0, 0x1d6ea400496)
/home/scylla-test/go/src/github.com/gocql/gocql/session.go:642 +0xbc
github.com/gocql/gocql.(*Session).ExecuteBatch(0xc000069880, 0xc0002b61c0, 0x981f40, 0xc0002d36a0)
/home/scylla-test/go/src/github.com/gocql/gocql/session.go:653 +0x39
main.DoBatchedWrites.func1(0xc00001db20, 0xc2479600, 0x981f40, 0x9788e0)
/home/scylla-test/go/src/github.com/scylladb/scylla-bench/modes.go:453 +0x518
main.RunTest(0xc00019b560, 0x7b0840, 0xc00001ae40, 0x7acd00, 0xc0002a70b0, 0xc000249ea0)
/home/scylla-test/go/src/github.com/scylladb/scylla-bench/modes.go:268 +0x10c
main.DoBatchedWrites(0xc000069880, 0xc00019b560, 0x7b0840, 0xc00001ae40, 0x7acd00, 0xc0002a70b0)
/home/scylla-test/go/src/github.com/scylladb/scylla-bench/modes.go:440 +0x179
main.main.func4(0x4, 0xc00019b560, 0x7acd00, 0xc0002a70b0)
/home/scylla-test/go/src/github.com/scylladb/scylla-bench/main.go:440 +0x145
main.RunConcurrently.func1(0xc000281020, 0xc0002a6d80, 0xc000290500, 0x7, 0x7, 0xc000281018, 0x4)
/home/scylla-test/go/src/github.com/scylladb/scylla-bench/modes.go:158 +0x73
created by main.RunConcurrently
/home/scylla-test/go/src/github.com/scylladb/scylla-bench/modes.go:156 +0x203
Error executing command: "/$HOME/go/bin/scylla-bench -workload=sequential -mode=write -max-rate=300 -replication-factor=3 -partition-count=10 -clustering-row-count=100 -clustering-row-size=5120 -concurrency=7 -rows-per-request=10 -nodes 10.142.0.4"; Exit status: 2
STDOUT: Connections: 4
STDERR: panic: runtime error: invalid memory address or nil pointer dereference
Running command "pgrep -f cassandra-stress | xargs -I{} kill -TERM -{}"...
Running command "pgrep -f ycsb | xargs -I{} kill -TERM -{}"...

[fruch]

I'm narrowed it down to this command that crash:

go run github.com/scylladb/scylla-bench -workload=sequential -mode=write -max-rate=300 -replication-factor=1 -clustering-row-size=5120 -concurrency=7 -rows-per-request=10

if I remove the -row-per-requests is works fine

from a quick look at the code, when -row-per-requests is bigger then one, batch statements is used for write, and failing on this.