Messages in this thread | | | From | Guenter Roeck <> | Subject | "Failed to create /dev/root: -14" after commit e6978e4bf1 ("ARM: save and reset the address limit when entering an exception") | Date | Tue, 2 Aug 2016 19:51:45 -0700 |
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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
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