panic: runtime error: while running Query #39603
Comments
Stmt is nil because an error occurred. You must check each err value returned before you can assume anything about the state of other return values. Unlike many projects on GitHub, the Go project does not use its bug tracker for general discussion or asking questions. We only use our bug tracker for tracking bugs and tracking proposals going through the Proposal Process. Please see https://golang.org/wiki/Questions for good places to ask questions. |
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//closePreparedStmt close prepared statement The nil check is done. As mentioned, the issue only happens occasionally and not every time when query is run. |
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Your nil statement is causing your core to panic From the stack trace you provided
0x0 as the first argument implies the receiver is nil. |
What version of Go are you using (
go version)?Does this issue reproduce with the latest release?
yes
What operating system and processor architecture are you using (
go env)?go envOutputWhat did you do?
stmt, err := d.db.Prepare(d.sqlMap[stmtName])
defer closePreparedStmt(stmt)
if err != nil {
fmt.Printf("error preparing %s: %s\n", stmtName, err)
return "", err
}
results, err := stmt.Query()
I noticed the panic below while running the service in production environment. My service does batch processing every hour and the issue happens randomly.
What did you expect to see?
Results from the query instead of panic
What did you see instead?
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x38 pc=0xa0a523]
goroutine 3936 [running]:
sync.(*RWMutex).RLock(...)
/usr/local/go/src/sync/rwmutex.go:48
database/sql.(*Stmt).QueryContext(0x0, 0xcfde00, 0xc0000280a0, 0xc0020d7c58, 0x2, 0x2, 0x0, 0x0, 0x0)
/usr/local/go/src/database/sql/sql.go:2539 +0x53
database/sql.(*Stmt).Query(...)
/usr/local/go/src/database/sql/sql.go:2594
service.(*DBStore).GetAll(0xc000206180, 0xc0001102a0, 0xc, 0xc000164270, 0x24, 0x0, 0x0, 0x0, 0x0, 0x0)
database/sql.(*Stmt).QueryContext(0x0, 0xcfde00, 0xc0000a2068, 0xc000219c58, 0x2, 0x2, 0x0, 0x0, 0x0)
/src/pkg/xxx.go:418 +0x35b
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