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| author |   Mikulas Patocka <mpatocka@redhat.com> | 2017-06-07 19:05:31 -0400 |
|---|---|---|
| committer |   Shaohua Li <shli@fb.com> | 2017-06-13 10:18:02 -0700 |
| commit | f9c79bc05a2a91f4fba8bfd653579e066714b1ec (patch) | |
| tree | b5a229ab75dc24ca0387588e4ea38a9da23b1ce1 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | md: fix deadlock between mddev_suspend() and md_write_start() (diff) | |
| download | wireguard-linux-f9c79bc05a2a91f4fba8bfd653579e066714b1ec.tar.xz wireguard-linux-f9c79bc05a2a91f4fba8bfd653579e066714b1ec.zip | |
md: don't use flush_signals in userspace processes
The function flush_signals clears all pending signals for the process. It
may be used by kernel threads when we need to prepare a kernel thread for
responding to signals. However using this function for an userspaces
processes is incorrect - clearing signals without the program expecting it
can cause misbehavior.
The raid1 and raid5 code uses flush_signals in its request routine because
it wants to prepare for an interruptible wait. This patch drops
flush_signals and uses sigprocmask instead to block all signals (including
SIGKILL) around the schedule() call. The signals are not lost, but the
schedule() call won't respond to them.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Acked-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions