This error happens even with Andy TLS fix on 32-bit (GDT is on fixmap but not readonly). I am looking into it. KVM internal error. Suberror: 3 extra data[0]: 80000b0e extra data[1]: 31 EAX=00000001 EBX=9f9121f3 ECX=4330b100 EDX=fffff000 ESI=547e0000 EDI=ffa74000 EBP=42273ef8 ESP=42273ef8 EIP=4105a0a2 EFL=00210002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0 ES =007b 00000000 ffffffff 00c0f300 DPL=3 DS [-WA] CS =0060 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA] SS =0068 00000000 ffffffff 00c09300 DPL=0 DS [-WA] DS =007b 00000000 ffffffff 00c0f300 DPL=3 DS [-WA] FS =00d8 1232d000 ffffffff 00809300 DPL=0 DS16 [-WA] GS =00e0 5492d4c0 00000018 00409100 DPL=0 DS [--A] LDT=0000 00000000 ffffffff 00c00000 TR =0080 5492b340 0000206b 00008b00 DPL=0 TSS32-busy GDT= ffa94000 000000ff IDT= fffba000 000007ff CR0=80050033 CR2=ff874000 CR3=02610000 CR4=00000690 DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 DR6=00000000ffff0ff0 DR7=0000000000000400 EFER=0000000000000000 Code=f0 d7 00 b8 01 00 00 00 8b 15 ec 48 29 42 8a 8a 00 50 87 ff <88> 8a 00 50 87 ff 31 c0 5d c3 55 89 e5 57 56 53 e8 8d f0 d7 00 89 c6 a1 00 ff dd 42 05 00 On Mon, Mar 20, 2017 at 9:57 PM, kernel test robot wrote: > > FYI, we noticed the following commit: > > commit: 69218e47994da614e7af600bf06887750ab6657a ("x86: Remap GDT tables in the fixmap section") > https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master > > in testcase: trinity > with following parameters: > > runtime: 300s > > test-description: Trinity is a linux system call fuzz tester. > test-url: http://codemonkey.org.uk/projects/trinity/ > > > on test machine: qemu-system-i386 -enable-kvm -smp 2 -m 320M > > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): > > > +--------------------------------------------------------------+------------+------------+ > | | f06bdd4001 | 69218e4799 | > +--------------------------------------------------------------+------------+------------+ > | boot_successes | 3 | 0 | > | boot_failures | 5 | 8 | > | BUG:kernel_reboot-without-warning_in_boot_stage | 4 | | > | WARNING:at_arch/x86/include/asm/fpu/internal.h:#fpu__restore | 1 | | > | BUG:kernel_hang_in_boot_stage | 0 | 8 | > +--------------------------------------------------------------+------------+------------+ > > [ 0.000000] sysrq: sysrq always enabled. > [ 0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes) > [ 0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes) > [ 0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes) > [ 0.000000] Initializing CPU#0 > [ 0.000000] allocated 331644 bytes of page_ext > [ 0.000000] Initializing HighMem for node 0 (00000000:00000000) > [ 0.000000] Memory: 267332K/327160K available (14061K kernel code, 1104K rwdata, 4696K rodata, 2460K init, 13208K bss, 59828K reserved, 0K cma-reserved, 0K highmem) > [ 0.000000] virtual kernel memory layout: > [ 0.000000] fixmap : 0xffa74000 - 0xfffff000 (5676 kB) > [ 0.000000] pkmap : 0xff400000 - 0xff800000 (4096 kB) > [ 0.000000] vmalloc : 0x547e0000 - 0xff3fe000 (2732 MB) > [ 0.000000] lowmem : 0x40000000 - 0x53fe0000 ( 319 MB) > [ 0.000000] .init : 0x4236a000 - 0x425d1000 (2460 kB) > [ 0.000000] .data : 0x41dbb72c - 0x42368300 (5810 kB) > [ 0.000000] .text : 0x41000000 - 0x41dbb72c (14061 kB) > > > Elapsed time: 480 > BUG: kernel hang in boot stage > > initrds=( > /osimage/yocto/yocto-tiny-i386-2016-04-22.cgz > /lkp/scheduled/vm-lkp-hsw01-yocto-i386-25/trinity-300s-yocto-tiny-i386-2016-04-22.cgz-69218e47994da614e7af600bf06887750ab6657a-20170319-117821-bls48g-0.cgz > /lkp/lkp/lkp-i386.cgz > > > To reproduce: > > git clone https://github.com/01org/lkp-tests.git > cd lkp-tests > bin/lkp qemu -k job-script # job-script is attached in this email > > > > Thanks, > Xiaolong -- Thomas