6/24/2023 0 Comments Bitburner kill not working![]() ![]() under Linux, since kernel 2.6.25, SIGKILL does interrupt processes blocked on an NFS access). ![]() The ps or top command will (on most unices) show it in state D (originally for “ disk”, I think).Ī classical case of long uninterruptible sleep is processes accessing files over NFS when the server is not responding modern implementations tend not to impose uninterruptible sleep (e.g. (But the process will be killed if it ever completes the system call.)Ī process blocked in a system call is in uninterruptible sleep. So if (due to a bug or misdesign) a system call blocks indefinitely, there may effectively be no way to kill the process. Kernel code blocks all signals when interrupting the system call would result in a badly formed data structure somewhere in the kernel, or more generally in some kernel invariant being violated. But kernel code can, and processes execute kernel code when they call system calls. Normally, processes cannot block SIGKILL. However, if the target has blocked the signal, the signal will be queued until the target unblocks it. ![]() Usually, delivering a signal takes at most a few microseconds, just the time it takes for the target to get a time slice. All signals, including SIGKILL, are delivered asynchronously: the kernel may take its time to deliver them. However kill -9 is not guaranteed to work immediately. There is one exception: even root cannot send a fatal signal to PID 1 (the init process). Basically either the process must be started by you and not be setuid or setgid, or you must be root. Kill -9 ( SIGKILL) always works, provided you have the permission to kill the process. ![]()
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