Re: [External] Re: BUG: KASAN: null-ptr-deref in workingset_eviction+0xf2/0x1e0

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On Tue, Dec 1, 2020 at 5:09 PM Naresh Kamboju <naresh.kamboju@xxxxxxxxxx> wrote:
>
> Hi Alex,
>
> On Tue, 1 Dec 2020 at 13:14, Alex Shi <alex.shi@xxxxxxxxxxxxxxxxx> wrote:
> >
> >
> >
> > 在 2020/12/1 上午3:52, Naresh Kamboju 写道:
> > > Crash log:
> > > -----------
> > > ioctl_sg01.c:81: TINFO: Found SCSI device /dev/sg1
> > > [  285.862123] ==================================================================
> > > [  285.863025] BUG: KASAN: null-ptr-deref in workingset_eviction+0xf2/0x1e0
> > > [  285.863025] Read of size 4 at addr 00000000000000c8 by task kswapd0/245
> >
> > Hi Naresh,
> >
> > Good to know you again. :)
>
> Same here :)
>
> >
> > Would you like to use command to check whichh line cause the panic:
> >
> > scripts/faddr2line vmlinux workingset_eviction+0xf2/0x1e0
>
> scripts/faddr2line vmlinux workingset_eviction+0xf2/0x1e0
> workingset_eviction+0xf2/0x1e0:
> workingset_eviction at ??:?
>
>
> vmlinux and system.map files available in this location,
> https://builds.tuxbuild.com/1l0FDtgxYSNunuG5ERIXtvPjZ7R/
>
> >
> > I can't reproduce it. and my gcc version mismatch with yours.
>
> Please run below easy steps to reproduce.
> you may install docker and tuxmake.
>
> Please share if you have any debug patch or proposed fix patch,
> I would be happy to test.

This is the fix patch. Thanks.

https://lore.kernel.org/linux-mm/20201130132345.GJ17338@xxxxxxxxxxxxxx/T/#m963f10e3e7f588156432131019136d53b7178bac

>
> Steps to reproduce:
> --------------------
> # TuxMake is a command line tool and Python library that provides
> # portable and repeatable Linux kernel builds across a variety of
> # architectures, toolchains, kernel configurations, and make targets.
> #
> # TuxMake supports the concept of runtimes.
> # See https://docs.tuxmake.org/runtimes/, for that to work it requires
> # that you install podman or docker on your system.
> #
> # To install tuxmake on your system globally:
> # sudo pip3 install -U tuxmake
> #
> # See https://docs.tuxmake.org/ for complete documentation.
>
> # tuxmake --runtime docker --target-arch x86_64 --toolchain gcc-9 \
> --kconfig defconfig \
> --kconfig-add https://builds.tuxbuild.com/1l0FDtgxYSNunuG5ERIXtvPjZ7R/config
>
> # run LTP
> # cd /opt/ltp
> # ./runltp -s ioctl_sg01
> # you see below crash
>
> - Naresh



-- 
Yours,
Muchun





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