Не могу прервать процесс



Пытаюсь отлаживать процесс из gdb. Иногда процесс перестаёт реагировать на Ctrl+C, в top'e в это время статус видет как tLl+, т.е. как я понял из описания:

Here are the different values that the s, stat and state output specifiers (header «STAT» or «S») will display to describe the state of a process.
D Uninterruptible sleep (usually IO)
R Running or runnable (on run queue)
S Interruptible sleep (waiting for an event to complete)
T Stopped, either by a job control signal or because it is being traced.
W paging (not valid since the 2.6.xx kernel)
X dead (should never be seen)
Z Defunct («zombie») process, terminated but not reaped by its parent.
For BSD formats and when the stat keyword is used, additional characters may be displayed:
< high-priority (not nice to other users)
N low-priority (nice to other users)
L has pages locked into memory (for real-time and custom IO)
s is a session leader
l is multi-threaded (using CLONE_THREAD, like NPTL pthreads do)
+ is in the foreground process group

В каких случаях процесс может игнорировать SIGINT? Signal handler на него не установлен.


D Uninterruptible sleep (usually IO)

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