Hi,
I see the following crash when running a qemu arm 'kzm' runtime test with the
current mainline.
Failed to create /dev/root: -14
[ followed by panic ]
A complete log file is at [1].
Bisect points to commit e6978e4bf1 ("ARM: save and reset the address limit when
entering
an exception"). Some additional debugging shows lots of similar error returns
from
strncpy_from_user(). For the error case resulting in the crash, the call chain
is as follows.
sys_mknod
sys_mknodat()
user_path_create()
getname()
getname_flags()
strncpy_from_user()
Reverting the patch fixes the problem.
I don't see the problem with any other qemu arm test.
It looks like the kernel runs in exception context. My gut feeling is that qemu
may be
to blame, but I am not really sure.
Any idea how to track this down ?
Thanks,
Guenter
---
[1] http://kerneltests.org/builders/qemu-arm-master/builds/615
