Showing error 1173

User: Jiri Slaby
Error type: Double Unlock
Error type description: Some lock is unlocked twice unintentionally in a sequence
File location: kernel/signal.c
Line in file: 1681
Project: Linux Kernel
Project version: 2.6.28
Tools: Stanse (1.2)
Entered: 2012-04-30 10:52:00 UTC

Source: 

1651
1652                if (!likely(sig->flags & SIGNAL_STOP_DEQUEUED) ||
1653                    unlikely(signal_group_exit(sig)))
1654                        return 0;
1655                /*
1656                 * There is no group stop already in progress.
1657                 * We must initiate one now.
1658                 */
1659                sig->group_exit_code = signr;
1660
1661                stop_count = 0;
1662                for (t = next_thread(current); t != current; t = next_thread(t))
1663                        /*
1664                         * Setting state to TASK_STOPPED for a group
1665                         * stop is always done with the siglock held,
1666                         * so this check has no races.
1667                         */
1668                        if (!(t->flags & PF_EXITING) &&
1669                            !task_is_stopped_or_traced(t)) {
1670                                stop_count++;
1671                                signal_wake_up(t, 0);
1672                        }
1673                sig->group_stop_count = stop_count;
1674        }
1675
1676        if (stop_count == 0)
1677                sig->flags = SIGNAL_STOP_STOPPED;
1678        current->exit_code = sig->group_exit_code;
1679        __set_current_state(TASK_STOPPED);
1680
1681        spin_unlock_irq(&current->sighand->siglock);
1682        finish_stop(stop_count);
1683        return 1;
1684}
1685
1686static int ptrace_signal(int signr, siginfo_t *info,
1687                         struct pt_regs *regs, void *cookie)
1688{
1689        if (!(current->ptrace & PT_PTRACED))
1690                return signr;
1691
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