Showing error 580

User: Jiri Slaby
Error type: Double Lock
Error type description: Some lock is locked twice unintentionally in a sequence
File location: kernel/signal.c
Line in file: 1741
Project: Linux Kernel
Project version: 2.6.28
Tools: Stanse (1.2)
Undetermined 1
Clang Static Analyzer (3.0)
Entered: 2011-11-07 22:19:59 UTC

Source: 

1711                info->si_code = SI_USER;
1712                info->si_pid = task_pid_vnr(current->parent);
1713                info->si_uid = current->parent->uid;
1714        }
1715
1716        /* If the (new) signal is now blocked, requeue it.  */
1717        if (sigismember(&current->blocked, signr)) {
1718                specific_send_sig_info(signr, info, current);
1719                signr = 0;
1720        }
1721
1722        return signr;
1723}
1724
1725int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka,
1726                          struct pt_regs *regs, void *cookie)
1727{
1728        struct sighand_struct *sighand = current->sighand;
1729        struct signal_struct *signal = current->signal;
1730        int signr;
1731
1732relock:
1733        /*
1734         * We'll jump back here after any time we were stopped in TASK_STOPPED.
1735         * While in TASK_STOPPED, we were considered "frozen enough".
1736         * Now that we woke up, it's crucial if we're supposed to be
1737         * frozen that we freeze now before running anything substantial.
1738         */
1739        try_to_freeze();
1740
1741        spin_lock_irq(&sighand->siglock);
1742        /*
1743         * Every stopped thread goes here after wakeup. Check to see if
1744         * we should notify the parent, prepare_signal(SIGCONT) encodes
1745         * the CLD_ si_code into SIGNAL_CLD_MASK bits.
1746         */
1747        if (unlikely(signal->flags & SIGNAL_CLD_MASK)) {
1748                int why = (signal->flags & SIGNAL_STOP_CONTINUED)
1749                                ? CLD_CONTINUED : CLD_STOPPED;
1750                signal->flags &= ~SIGNAL_CLD_MASK;
1751                spin_unlock_irq(&sighand->siglock);
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