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Line 199 is the first line of: 

void
recursive_lock_release(pTHX_ recursive_lock_t *lock)
{
    MUTEX_LOCK(&lock->mutex);
    if (lock->owner == aTHX) {
        if (--lock->locks == 0) {
            lock->owner = NULL;
            COND_SIGNAL(&lock->cond);
        }
    }
    MUTEX_UNLOCK(&lock->mutex);
}

[download]

from http://cpansearch.perl.org/src/RGARCIA/perl-5.10.0/ext/threads/shared/shared.xs.

http://cpansearch.perl.org/src/RGARCIA/perl-5.10.0/thread.h contains: 

#  define MUTEX_LOCK(m) \
    STMT_START {                        \
    int _eC_;                        \
    if ((_eC_ = pthread_mutex_lock((m))))            \
        Perl_croak_nocontext("panic: MUTEX_LOCK (%d) [%s:%d]",    \
                 _eC_, __FILE__, __LINE__);    \
    } STMT_END

[download]

So 22 is "eC" (error code, I'd guess). A $! of 22 is "Invalid argument" for a random Linux box I checked. You should be able to grep for pthread_mutex_lock to dig deeper, etc.

I hope that helps.

- tye        

In reply to Re: panic: MUTEX_LOCK (22) - what should I look for? (tools) by tye
in thread panic: MUTEX_LOCK (22) - what should I look for? by Wiggins

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