ipipe-arm64 kernel issue

Pintu Agarwal pintu.ping at gmail.com
Fri Dec 21 13:48:47 CET 2018


On Thu, Dec 13, 2018 at 6:20 PM Steve Pavao via Xenomai
<xenomai at xenomai.org> wrote:
>
>
> > On Dec 12, 2018, at 5:21 AM, Philippe Gerum <rpm at xenomai.org> wrote:
> >
> > On 12/11/18 10:25 PM, Steve Pavao via Xenomai wrote:
> >> I have 2 different, basic apps that oops in a very similar way on ipipe-arm64 running on R Pi 3B.  One of them is rpm, another is my own program.
> >>
> >> Here is the partial backtrace for the ‘rpm’ oops.  The backtrace for my other program is almost identical.  (I’ve left out interim calls to keep this email concise.)
> >>
> >> [  124.816179] [<ffffff8008260480>] __find_get_block+0x2a0/0x400
> >> ...
> >> [  124.816311] [<ffffff8008778b88>] do_page_fault+0x268/0x4e0
> >> [  124.816320] [<ffffff8008778e6c>] do_translation_fault+0x6c/0x7c
> >> [  124.816330] [<ffffff80080814ec>] do_mem_abort+0x54/0xc8
> >>
> >> The BUG finally occurs at line 1279 of buffer.c:
> >>
> >> static inline void check_irqs_on(void)
> >> {
> >> #ifdef irqs_disabled
> >>      BUG_ON(irqs_disabled());   //  <———— here
> >> #endif
> >> }
> >>
> >> The above BUG happens during the page fault recovery process.  (FYI, some of the calls between do_page_fault_and __find_get_block are ext4 calls.)
> >>
> >> In both apps, the oops happens around the time of file creation on the SD card:  For rpm, it is during an install of a valid rpm package, for the other app, it occurs at the time a sqlite database is opened.  This is basic stuff that should just work.
> >>
> >> I am looking for ideas about what could be wrong with the setup/configuration of my ipipe-arm64 system, such that some apps that read/write to the SD card are oopsing this way when doing page fault recovery.
> >
> > This is a bug in the I-pipe layer. Assuming you are still running kernel
> > 4.9, please try 4.14 from [1], it fixes several issues which still exist
> > in the 4.9 pipeline.
> >
> > [1] https://gitlab.denx.de/Xenomai/ipipe-arm64/commits/stable/4.14.71-arm64 <https://gitlab.denx.de/Xenomai/ipipe-arm64/commits/stable/4.14.71-arm64>
> >
> >
> > --
> > Philippe.
>
> Thank you very much!  That code does fix the kernel oops problem.
>

Hello Steve,
I am also facing the similar issue.
Can you point me to the exact patch that fixes this issue.
Actually I am using a vendor kernel repo, so I cannot upgrade the kernel.
I can only apply the fix patches.



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