ORA-24550: signal received: [si_signo=6] error

Question

I want to know what ORA-24550: signal received: [si_signo=6] means?

I know this is an oracle error and may an oracle latest patch can solve the issue.

When t

Answer 1

This is a sign that your Oracle client has received a signal it wasn't expecting. The Oracle docs say:

ORA-24550: unhandled signal #number received. string

Cause: Serious error: signal received

Action: Refer to the platform-specific signal code, and see if the application code caused the error. Otherwise, record all error state and notify Oracle Support Services.

By default, Oracle registers its own signal handlers, but you can configure it to let signals propagate instead.

You will generally see a log line like this:

ORA-24550: signal received: [si_signo=6] [si_errno=0] [si_code=1] [si_int=597680428] [si_ptr=0x239fe290] [si_addr=0x3f445c43c0]

and you may see a traceback too.

To debug, you need to find out what is producing this signal. si_signo=6 means that you're getting signal 6. We can find out which signal this is with $ man 7 signal:

Standard Signals

Signal     Value     Action   Comment
-------------------------------------------------------------------------
SIGHUP        1       Term    Hangup detected on controlling terminal
                              or death of controlling process
SIGINT        2       Term    Interrupt from keyboard
SIGQUIT       3       Core    Quit from keyboard
SIGILL        4       Core    Illegal Instruction
SIGABRT       6       Core    Abort signal from abort(3)
SIGFPE        8       Core    Floating point exception
SIGKILL       9       Term    Kill signal
SIGSEGV      11       Core    Invalid memory reference
SIGPIPE      13       Term    Broken pipe: write to pipe with no readers
SIGALRM      14       Term    Timer signal from alarm(2)
SIGTERM      15       Term    Termination signal

We can see you're getting SIGABRT. This usually means something is calling abort().