Hi Boris, On Thu, Dec 16, 2021 at 11:06:59AM +0100, Borislav Petkov wrote: > On Thu, Dec 16, 2021 at 03:04:16PM +0800, Yin Fengwei wrote: > > The testing was with Qemu. > > This is hardly what I asked for. > > > And we found that the hang is related with clang-14. > > I saw that already. > > > The original report showed the kernel is built with clang-14: > > # build kernel > > cd linux > > cp config-5.16.0-rc3-00003-gf154f290855b .config > > make HOSTCC=clang-14 CC=clang-14 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules > > make HOSTCC=clang-14 CC=clang-14 ARCH=x86_64 INSTALL_MOD_PATH= modules_install > > I saw that too. > > > Looks like KASAN related stub generated by clang-14 (KASAN_SHADOW_OFFSET and asan_report). > > This function is early function called before kasan_init. > > > > Looks like we need to disable KASAN_SANITIZE for arch/x86/kernel/cpu/common.c. So clang-14 will > > be happy with this kind of early TLB flush? Thanks. > > Ok, I don't understand: I asked for how exactly to reproduce and whether > you can send me your vmlinux you built with your clang-14. What I get is > some possible explanation about what might be happening. > > So what do you expect me to do? Say, "oh, sure, you're right, send me a > patch" without even being able to see for myself what the root cause is? > > What if it is not the kernel's fault but clang-14 is miscompiling crap > as in so many other cases? > > I built clang-14 and built with your .config and it works here fine. So > why does yours fail? > > Or what's the point of all this? > > I mean, if you cannot send me what I ask for, you can say so. Then I can > ignore this whole report altogether and waste my time somewhere else. We have uploaded vmlinuz, modules.cgz, config as well as other related file to: https://download.01.org/0day-ci/lkp-qemu/pkg/linux/x86_64-randconfig-a013-20211207/clang-14/f154f290855b070cc94dd44ad253c0ef8a9337bb/ Machine types can refer to: https://zerobin.net/?e107cf7b56495d80#MQLh14wUT9Osv1tWCwiQx/okkAN48Nq+drVPE0PiNPw= If there's any other msg needed, pls feel free to propose, thanks. Below are our full steps to reproduce the issue: # download lkp-tests $ git clone https://github.com/intel/lkp-tests.git $ cd lkp-tests/ # download vmlinuz $ wget https://download.01.org/0day-ci/lkp-qemu/pkg/linux/x86_64-randconfig-a013-20211207/clang-14/f154f290855b070cc94dd44ad253c0ef8a9337bb/vmlinuz-5.16.0-rc3-00003-gf154f290855b # dowmload modules.cgz $ wget https://download.01.org/0day-ci/lkp-qemu/pkg/linux/x86_64-randconfig-a013-20211207/clang-14/f154f290855b070cc94dd44ad253c0ef8a9337bb/modules.cgz # download job-script which is attached # run lkp qemu lkp-tests$ sudo bin/lkp qemu -k vmlinuz-5.16.0-rc3-00003-gf154f290855b -m modules.cgz job-script ~/lkp-tests/pkg/lkp-src ~/lkp-tests x86_64 ==> Making package: lkp-src 0-1 (Thu 16 Dec 2021 07:26:22 PM CST) ==> Checking runtime dependencies... ==> Checking buildtime dependencies... ==> WARNING: Using existing $srcdir/ tree ==> Removing existing $pkgdir/ directory... ==> Starting build()... make: Entering directory '/home/carel/lkp-tests/bin/event' klcc -D_FORTIFY_SOURCE=2 -c -o wakeup.o wakeup.c klcc -Wl,-O1,--sort-common,--as-needed,-z,relro -static -o wakeup wakeup.o rm -f wakeup.o strip wakeup make: Leaving directory '/home/carel/lkp-tests/bin/event' ==> Entering fakeroot environment... x86_64 ==> Starting package()... ==> Creating package "lkp-src"... 103987 blocks renamed '/home/carel/.lkp/cache/lkp-x86_64.cgz.tmp' -> '/home/carel/.lkp/cache/lkp-x86_64.cgz' ==> Leaving fakeroot environment. ==> Finished making: lkp-src 0-1 (Thu 16 Dec 2021 07:26:24 PM CST) ~/lkp-tests 12 blocks result_root: /home/carel/.lkp//result/boot/1/vm-snb/debian-10.4-x86_64-20200603.cgz/x86_64-randconfig-a013-20211207/clang-14/f154f290855b070cc94dd44ad253c0ef8a9337bb/0 downloading initrds ... use local modules: /home/carel/.lkp/cache/modules.cgz /usr/bin/wget -q --timeout=1800 --tries=1 --local-encoding=UTF-8 http://0day.sh.intel.com:80/~lkp/osimage/debian/debian-10.4-x86_64-20200603.cgz -N -P /home/carel/.lkp/cache/osimage/debian 440459 blocks /usr/bin/wget -q --timeout=1800 --tries=1 --local-encoding=UTF-8 http://0day.sh.intel.com:80/~lkp/osimage/deps/debian-10.4-x86_64-20200603.cgz/run-ipconfig_20200608.cgz -N -P /home/carel/.lkp/cache/osimage/deps/debian-10.4-x86_64-20200603.cgz 1773 blocks /usr/bin/wget -q --timeout=1800 --tries=1 --local-encoding=UTF-8 http://0day.sh.intel.com:80/~lkp/osimage/deps/debian-10.4-x86_64-20200603.cgz/lkp_20210707.cgz -N -P /home/carel/.lkp/cache/osimage/deps/debian-10.4-x86_64-20200603.cgz 2321 blocks /usr/bin/wget -q --timeout=1800 --tries=1 --local-encoding=UTF-8 http://0day.sh.intel.com:80/~lkp/osimage/deps/debian-10.4-x86_64-20200603.cgz/rsync-rootfs_20200608.cgz -N -P /home/carel/.lkp/cache/osimage/deps/debian-10.4-x86_64-20200603.cgz 6856 blocks exec command: qemu-system-x86_64 -enable-kvm -fsdev local,id=test_dev,path=/home/carel/.lkp//result/boot/1/vm-snb/debian-10.4-x86_64-20200603.cgz/x86_64-randconfig-a013-20211207/clang-14/f154f290855b070cc94dd44ad253c0ef8a9337bb/0,security_model=none -device virtio-9p-pci,fsdev=test_dev,mount_tag=9p/virtfs_mount -kernel vmlinuz-5.16.0-rc3-00003-gf154f290855b -append root=/dev/ram0 user=lkp job=/lkp/jobs/scheduled/vm-snb-192/boot-1-debian-10.4-x86_64-20200603.cgz-f154f290855b070cc94dd44ad253c0ef8a9337bb-20211208-23538-lnvkeg-5.yaml ARCH=x86_64 kconfig=x86_64-randconfig-a013-20211207 branch=tip/x86/mm commit=f154f290855b070cc94dd44ad253c0ef8a9337bb BOOT_IMAGE=/pkg/linux/x86_64-randconfig-a013-20211207/clang-14/f154f290855b070cc94dd44ad253c0ef8a9337bb/vmlinuz-5.16.0-rc3-00003-gf154f290855b vmalloc=128M initramfs_async=0 page_owner=on max_uptime=600 RESULT_ROOT=/result/boot/1/vm-snb/debian-10.4-x86_64-20200603.cgz/x86_64-randconfig-a013-20211207/clang-14/f154f290855b070cc94dd44ad253c0ef8a9337bb/3 LKP_LOCAL_RUN=1 selinux=0 debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 net.ifnames=0 printk.devkmsg=on panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 drbd.minor_count=8 systemd.log_level=err ignore_loglevel console=tty0 earlyprintk=ttyS0,115200 console=ttyS0,115200 vga=normal rw ip=dhcp result_service=9p/virtfs_mount -initrd /home/carel/.lkp/cache/final_initrd -smp 2 -m 3144M -no-reboot -watchdog i6300esb -rtc base=localtime -device e1000,netdev=net0 -netdev user,id=net0 -display none -monitor null -serial stdio early console in setup code early console in extract_kernel input_data: 0x0000000006ffc2e0 input_len: 0x000000000260cb2b output: 0x0000000001000000 output_len: 0x00000000079e7da4 kernel_total_size: 0x0000000008a2c000 needed_size: 0x0000000008c00000 trampoline_32bit: 0x000000000009d000 Physical KASLR using RDTSC... Virtual KASLR using RDTSC... Decompressing Linux... Parsing ELF... Performing relocations... done. Booting the kernel. > > -- > Regards/Gruss, > Boris. > > SUSE Software Solutions Germany GmbH, GF: Ivo Totev, HRB 36809, AG Nürnberg