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
