linux-kernel - Re: [LKP] Re: [x86/mm/64] f154f29085: BUG:kernel_reboot-without-warning_in_boot

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Date:   Wed, 15 Dec 2021 15:00:13 +0800
From:   Carel Si <beibei.si@...el.com>
To:     Borislav Petkov <bp@...e.de>
Cc:     kernel test robot <oliver.sang@...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 Tue, Dec 14, 2021 at 05:38:57PM +0100, Borislav Petkov wrote:
> On Thu, Dec 09, 2021 at 10:41:41PM +0800, kernel test robot wrote:
> > 
> > 
> > Greeting,
> > 
> > FYI, we noticed the following commit (built with clang-14):
> > 
> > commit: f154f290855b070cc94dd44ad253c0ef8a9337bb ("x86/mm/64: Flush global TLB on boot and AP bringup")
> > https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git x86/mm
> > 
> > in testcase: boot
> > 
> > on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
> > 
> > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> > 
> > 
> > +-------------------------------------------------+------------+------------+
> > |                                                 | 9de4999050 | f154f29085 |
> > +-------------------------------------------------+------------+------------+
> > | BUG:kernel_reboot-without-warning_in_boot_stage | 0          | 13         |
> > +-------------------------------------------------+------------+------------+
> > 
> > 
> > If you fix the issue, kindly add following tag
> > Reported-by: kernel test robot <oliver.sang@...el.com>
> > 
> > 
> > Physical KASLR using RDTSC...
> > Virtual KASLR using RDTSC...
> > 
> > Decompressing Linux... Parsing ELF... Performing relocations... done.
> > Booting the kernel.
> > BUG: kernel reboot-without-warning in boot stage
> > Linux version 5.16.0-rc3-00003-gf154f290855b #1
> > Command line: ip=::::vm-snb-192::dhcp 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_SERVER=internal-lkp-server 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 rcuperf.shutdown=0 watchdog_thresh=240
> > 
> > Kboot worker: lkp-worker30
> > Elapsed time: 60
> 
> My guest boots fine here on an AMD host, albeit it takes a while until
> "Booting the kernel" appears.
> 
> You probably should verify by hand whether your guest simply needs
> longer before it starts booting the kernel...

We have verified by hand, still can reproduce this issue. 

We also double checked, this issue still exists in 35fa745286 ("x86/mm: Include 
spinlock_t definition in pgtable") which is the head of tip/x86/mm, thanks.

=========================================================================================
compiler/kconfig/rootfs/sleep/tbox_group/testcase:
  clang-14/x86_64-randconfig-a013-20211207/debian-10.4-x86_64-20200603.cgz/1/vm-snb/boot

commit: 
  9de4999050 ("x86/realmode: Add comment for Global bit usage in trampoline_pgd")
  f154f29085 ("x86/mm/64: Flush global TLB on boot and AP bringup") 
  35fa745286 ("x86/mm: Include spinlock_t definition in pgtable.")

9de4999050b5f2e8 f154f290855b070cc94dd44ad25 35fa745286ac44ee26ed100c2bd 
---------------- --------------------------- --------------------------- 
       fail:runs  %reproduction    fail:runs  %reproduction    fail:runs
           |             |             |             |             |    
           :27         100%          27:27         100%          27:27    dmesg.BUG:kernel_reboot-without-warning_in_boot_stage

> 
> early console in setup code
> early console in extract_kernel
> input_data: 0x0000000005ce82e0
> input_len: 0x0000000001d21920
> output: 0x0000000001000000
> output_len: 0x000000000650d2ec
> kernel_total_size: 0x0000000006e2c000
> needed_size: 0x0000000007000000
> trampoline_32bit: 0x000000000009d000
> Physical KASLR using RDTSC...
> Virtual KASLR using RDTSC...
> 
> Decompressing Linux... Parsing ELF... Performing relocations... done.
> Booting the kernel.
> [    0.000000][    T0] Linux version 5.16.0-rc3-00005-g35fa745286ac (boris@zn) (ClangBuiltLinux clang version 14.0.0 (https://github.com/llvm/llvm-project 08a770c378ca5d8975ef305d15f297c3f980d186), GNU ld (GNU Binutils for Debian) 2.37) #3 PREEMPT Tue Dec 14 17:29:41 CET 2021
> [    0.000000][    T0] Command line: root=/dev/sda1 resume=/dev/sda2 debug ignore_loglevel log_buf_len=16M earlyprintk=ttyS0,115200 console=ttyS0,115200 console=tty0 no_console_suspend net.ifnames=0 
> [    0.000000][    T0] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'
> [    0.000000][    T0] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
> [    0.000000][    T0] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
> [    0.000000][    T0] x86/fpu: xstate_offset[2]:  576, xstate_sizes[2]:  256
> [    0.000000][    T0] x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format.
> [    0.000000][    T0] signal: max sigframe size: 1360
> [    0.000000][    T0] printk: debug: ignoring loglevel setting.
> [    0.000000][    T0] printk: bootconsole [earlyser0] enabled
> [    0.000000][    T0] BIOS-provided physical RAM map:
> ...
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> SUSE Software Solutions Germany GmbH, GF: Ivo Totev, HRB 36809, AG Nürnberg
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