Questions tagged [thread]
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125 questions
0 votes
0 answers
83 views
Do linux kernel threads run in process context?
I'm aware of Linux softirqs may run within specific per-cpu kernel thread context -- ksoftirqd/[cpu_id]. Kernel threads are similar to user-space threads, however they only execute kernel code in ...
- 385
0 votes
2 answers
138 views
Troj/PHPShel-CE and PHP/Agent-BJNA trojan
I'm currently dealing with a real threat: the trojans Troj/PHPShel-CE and PHP/Agent-BJNA showed up on my system. I've decided to move to another provider – the first server IP was already blacklisted, ...
- 1
2 votes
1 answer
272 views
What is a parked thread in Linux kernel?
What is a parked thread in the context of Linux kernel? I mean a thread that is in TASK_PARKED state? How this state differs from TASK_INTERRUPTIBLE and TASK_UNINTERRUPTIBLE? From which state a thread ...
- 179
1 vote
1 answer
99 views
Hit a strange signal settings of a kernel thread in Linux
I am working on an embedded Linux system (kernel-5.10.24), and using busybox as init. Now I hit a strange problem about signal settings of a kernel thread in system. The kernel thread is from a device ...
- 651
1 vote
1 answer
330 views
Why can't Linux provide lighter/green threads?
I often hear that linux threads are heavy (requiring 8mb stack size) and this is why languages like golang implement their own green threads in userspace (allocating to the heap). This then allows ...
5 votes
2 answers
4k views
Are there any benefits in setting a HDD's logical sector size to 4Kn?
Modern HDDs all are "Advanced Format" ones, e.g. by default they report a logical/physical sector size of 512/4096. By default, most Linux formatting tools use a block size of 4096 bytes (at ...
- 2,019
0 votes
1 answer
133 views
why ulimit restriction is affect by other processes?
I have some processes creating large amount of threads (using python ray module), like 32 (proc) * 120 (thread per proc). Then I found other processes would fail on creating threads while their nTH is ...
2 votes
1 answer
613 views
How can I locate the stacks of child tasks (threads) using /proc/<pid>/maps?
PURPOSE: I am theorising as to how one would go about creating a pointer scanner in a Linux environment. DISCLAIMER: My findings have been tested on Debian Bookworm (current stable) and a Gentoo ...
- 21
3 votes
1 answer
1k views
Why does Linux needs both pid_max and threads-max?
I understand the difference between /proc/sys/kernel/pid_max and /proc/sys/kernel/threads-max. There's a good explanation at the answer to Understanding the differences between pid_max, ulimit -u and ...
- 6,965
1 vote
1 answer
433 views
Does the definition of a thread in Linux depend on a system call?
Clone In the manual page for clone()/clone3() system call I find: CLONE_THREAD (since Linux 2.4.0). If CLONE_THREAD is set, the child is placed in the same thread group as the calling process. To ...
- 170
0 votes
2 answers
480 views
How to find PID of all processes related to a given process?
How can I go about finding the PID or other information about a process that is doing the work of another process? I'm talking about kworker threads, for example, or any other threads/processes that ...
-2 votes
2 answers
7k views
Difference between cores and logical processors
I have a question about core and logical processors. So, my computer has 1 CPU with 2 cores and 4 logical processors. Does this mean that my computer has 4 threads, 2 threads for every core? Than why ...
- 105
3 votes
1 answer
1k views
How do you fetch a large file over http in parallel?
Question: Since HTTP supports resuming at an offset, are there any tools (or existing options for commands like wget or curl) that will launch multiple threads to fetch the file in parallel with ...
- 545
3 votes
0 answers
678 views
nvidia (proprietary) drivers : What are these kernel threads?
Running some 340 driver (with an nvidia.ko module loaded at init time) I moved to a 470 driver and discover half a dozen of kernel threads I failed to find any information about : 2 [nv_queue] : What ...
- 8,665
0 votes
1 answer
432 views
History process
Is there a command line to retrieve all information like pid tid of threads in Linux? For instance if one process has dead before the command ps runs. The command does not find the process
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