Messages in this thread | | | Subject | Re: ARM64: kernel panics in DABT in sys_msync path | From | "Ruigrok, Richard" <> | Date | Mon, 25 Sep 2017 14:52:26 -0600 |
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On 9/25/2017 1:04 PM, Yury Norov wrote: > On Mon, Sep 25, 2017 at 05:02:40PM +0300, Yury Norov wrote: >> Hi Will, >> >>>> The bug is reproducible for ilp32 and lp64 binaries. For kernel 4.12 >>>> and for all kernels if '-smp 1' is passed to qemu, everything works >>>> fine. If no ideas, I think I'm able bisect it. >>> I tried to reproduce this on hardware, but failed to do so. Our nightly >>> tests are also coming back fine for rwtest03. I just built Qemu v2.10.0 >>> and that also passes the test with -smp 4 for me, so I'm a bit stuck. Hi Will,
I also found this issue with kernels from 4.11 through 4.13, reproduced on Hardware. In my tests, I found that it reproduces only with 4K page and Transparent Huge Pages. With 64K page I was not able to reproduce. RH also reported it here: https://bugzilla.redhat.com/show_bug.cgi?id=1491504 and Linaro reported on the 4.12 based RPK kernel.
https://bugs.linaro.org/show_bug.cgi?id=3191
https://bugs.linaro.org/show_bug.cgi?id=3068.
I was able to bisect down to a specific commit: f27176cfc363 mm: convert page_mkclean_one() to use page_vma_mapped_walk()
Ran with LTP 20170516 release, rwtest: ./runltp -p -f fs -s rwtest To validate bisecting (good points), I ran 30 iterations. Usually it reproduces in 5-10 iterations.
LMK if you have any suggestions for instrumentation, when running with ftrace I could not repro. I can run tests on 4.13 or on 4.11 at the above bisect point. I have not tried any 4.14-rc yet. >> I also see the test passed sometimes. I run it in endless cycle and >> leave for a while. 5-10 iterations are usually enough. >> >>> Could you share: >>> >>> * Your kernel .config >>> * Your QEMU command line >>> * Details of your userspace >> Qemu configure command: >> ./configure --target-list=aarch64-softmmu --enable-fdt --enable-vhost-net --enable-kvm >> >> And run command: >> /home/yury/work/qemu-2.10.0/aarch64-softmmu/qemu-system-aarch64 \ >> -machine virtualization=true -machine gic-version=3 \ >> -machine virt -cpu cortex-a57 -nographic -smp 4 -m 1024 \ >> -global virtio-blk-device.scsi=off -device virtio-scsi-device,id=scsi \ >> -drive file=img/ubuntu-core-14.04.1-core-arm64.img,id=coreimg,cache=unsafe,if=none -device scsi-hd,drive=coreimg \ >> -kernel /home/yury/work/linux/arch/arm64/boot/Image \ >> --append "console=ttyAMA0 root=/dev/sda" \ >> -initrd initrd.img-3.13.0-62-generic \ >> $NETWORK \ >> -redir tcp:2222::22 \ >> -s \ >> $@ >> >> My userspace is Ubuntu 14. I build lp64 tests with default Ubuntu >> toolchain, and ilp32 tests with Linaro cross-toolchain. >> >> The config is attached, and the branch is vanilla 4.13 kernel, or this >> one: >> https://github.com/norov/linux/tree/ilp32-4.13 >> >> Later today I will share the whole qemu environment I use. > https://drive.google.com/file/d/0B07VUB3kjLD8Mm5XN21qTTBfbnc/view > >> Yury > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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