On Wed, Jan 13, 2021 at 01:26:11PM +0100, Greg Kroah-Hartman wrote: > On Wed, Jan 13, 2021 at 05:35:18PM +0530, Pintu Agarwal wrote: > > On Tue, 12 Jan 2021 at 17:39, Greg Kroah-Hartman > > <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > > > > > On Tue, Jan 12, 2021 at 05:31:54PM +0530, Pintu Agarwal wrote: > > > > Hi, > > > > > > > > I am using Kernel: 4.9.217 for one of the ARM32 boards for Qualcomm SOC. > > > > https://github.com/android-linux-stable/msm-4.9 > > > > > > > > But I think this is a general bug applicable to :Kernel 4.9 under > > > > fs/sysfs/file.c > > > > So, I wanted to quickly check here if others are familiar with this > > > > issue and if it is fixed already. > > > > Note, this issue does not occur in 4.14 Kernel. > > > > > > > > When I execute below command, the Kernel is crashing. > > > > I tried to add few debug prints to find more details. I see that the > > > > ops->show pointer is not valid (seems corrupted). > > > > So I wanted to understand how this can happen only for this particular node. > > > > Other sysfs entries are working fine. > > > > > > > > I see that this issue was reported earlier as well by others. > > https://syzkaller.appspot.com/bug?id=2ec2a9da5c711df3d3d12071bac487b96e75e103 > > https://gitlab.freedesktop.org/drm/amd/-/issues/413 > > https://bugzilla.redhat.com/show_bug.cgi?id=1615070 > > > > So it seems to be common issue and thus I wanted to check here if its similar. > > It's "common" in that this is core kernel code that any number of > drivers could be causing to work incorrectly. Try fixing up the driver > code, and odds are, that will fix this issue. > > good luck, and again, go ask for support from your vendor, you are > paying for that! And, if you look close at the above links, you will see where the error is, and what the out-of-tree code needs to to do be fixed up properly. An exercise for that is left for the vendor :) greg k-h
