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Message-ID: <20211216115838.GA23522@linux.intel.com>
Date: Thu, 16 Dec 2021 19:58:40 +0800
From: Carel Si <beibei.si@...el.com>
To: Borislav Petkov <bp@...e.de>
Cc: Yin Fengwei <fengwei.yin@...el.com>,
Joerg Roedel <jroedel@...e.de>,
LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
lkp@...ts.01.org, lkp@...el.com
Subject: Re: [LKP] Re: [x86/mm/64] f154f29085:
BUG:kernel_reboot-without-warning_in_boot_stage
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=<mod-install-dir> 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
View attachment "job-script" of type "text/plain" (4909 bytes)
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