10-07-2015
Process remians in Running state causing other similar process to sleep and results to system hang
Hi Experts,
I am facing one problem here which is one process always stuck in running state which causes the other similar process to sleep state . This causes my system in hanged state.
On doing cat /proc/<pid>wchan showing the "__init_begin" in the output.
Can you please help me here why it is getting stuck in the __init_begin API. I am using linux kernel version 2.6.17.
Also i am not facing such probelm in kernel version 2.6.39
i have seen they have given one fix inside __init_begin in the kernel version 2.6.37 . Below is the fix
diff --git a/arch/um/kernel/uml.lds.S b/arch/um/kernel/uml.lds.S
index e7a6cca..664f942 100644
--- a/arch/um/kernel/uml.lds.S
+++ b/arch/um/kernel/uml.lds.S
@@ -22,7 +22,7 @@ SECTIONS
_text = .;
_stext = .;
__init_begin = .;
- INIT_TEXT_SECTION(PAGE_SIZE)
+ INIT_TEXT_SECTION(0)
. = ALIGN(PAGE_SIZE);
.text :
Now , how this fix related to my problem . please help me to overcome this problem
Looking forward for your suggestions and comments.
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LEARN ABOUT LINUX
sigreturn
SIGRETURN(2) Linux Programmer's Manual SIGRETURN(2)
NAME
sigreturn - return from signal handler and cleanup stack frame
SYNOPSIS
int sigreturn(unsigned long __unused);
DESCRIPTION
When the Linux kernel creates the stack frame for a signal handler, a call to sigreturn() is inserted into the stack frame so that upon
return from the signal handler, sigreturn() will be called.
This sigreturn() call undoes everything that was done--changing the process's signal mask, switching stacks (see sigaltstack(2))--in order
to invoke the signal handler: it restores the process's signal mask, switches stacks, and restores the process's context (registers, pro-
cessor flags), so that the process directly resumes execution at the point where it was interrupted by the signal.
RETURN VALUE
sigreturn() never returns.
FILES
/usr/src/linux/arch/i386/kernel/signal.c
/usr/src/linux/arch/alpha/kernel/entry.S
CONFORMING TO
sigreturn() is specific to Linux and should not be used in programs intended to be portable.
NOTES
The sigreturn() call is used by the kernel to implement signal handlers. It should never be called directly. Better yet, the specific use
of the __unused argument varies depending on the architecture.
SEE ALSO
kill(2), sigaltstack(2), signal(2), signal(7)
COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2008-06-26 SIGRETURN(2)