58484ab427
commit 9bc508cf0791c8e5a37696de1a046d746fcbd9d8 upstream. Reading the history it is unclear why default_trap_handler calls do_exit. It is not even menthioned in the commit where the change happened. My best guess is that because it is unknown why the exception happened it was desired to guarantee the process never returned to userspace. Using do_exit(SIGSEGV) has the problem that it will only terminate one thread of a process, leaving the process in an undefined state. Use force_sigsegv(SIGSEGV) instead which effectively has the same behavior except that is uses the ordinary signal mechanism and terminates all threads of a process and is generally well defined. Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: linux-s390@vger.kernel.org Fixes: ca2ab03237ec ("[PATCH] s390: core changes") History Tree: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Link: https://lkml.kernel.org/r/20211020174406.17889-11-ebiederm@xmission.com Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Thomas Backlund <tmb@iki.fi> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.