From mboxrd@z Thu Jan 1 00:00:00 1970 From: leonard.crestez@nxp.com (Leonard Crestez) Date: Tue, 25 Jul 2017 13:28:01 +0300 Subject: [PATCH 1/3] arm/syscalls: Move address limit check in loop In-Reply-To: References: <20170719175900.124074-1-thgarnie@google.com> Message-ID: <1500978481.30745.10.camel@nxp.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, 2017-07-24 at 10:07 -0700, Thomas Garnier wrote: > On Wed, Jul 19, 2017 at 10:58 AM, Thomas Garnier > wrote: > > > > The work pending loop can call set_fs after addr_limit_user_check > > removed the _TIF_FSCHECK flag. To prevent the infinite loop, move > > the addr_limit_user_check call at the beginning of the loop. > > > > Fixes: 73ac5d6a2b6a ("arm/syscalls: Check address limit on user- > > mode return") > > Reported-by: Leonard Crestez > > Signed-off-by: Thomas Garnier > Any comments on this patch set? Tested-by: Leonard Crestez This appears to fix the original issue of failing to boot from NFS when there are lots of alignment faults. But this is a very basic test relative to the reach of this change. However the original patch has been in linux-next for a while and apparently nobody else noticed system calls randomly hanging on arm. I assume maintainers need to give their opinion.