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SubjectRe: [x86/topology] 05aa90edc7: kernel_BUG_at_arch/x86/kernel/cpu/common.c
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On 09/11/2017 07:46 PM, kernel test robot wrote:
> FYI, we noticed the following commit:
>
> commit: 05aa90edc7910ec3d1ed791fa77371b3acb9bf08 ("x86/topology: Avoid wasting 128k for package id array")
> url: https://github.com/0day-ci/linux/commits/Andi-Kleen/perf-x86-intel-uncore-Cache-logical-pkg-id-in-uncore-driver/20170910-025322
>
>
> in testcase: pm-qa
> with following parameters:
>
> test: cpuidle
>
>
>
> on test machine: qemu-system-x86_64 -enable-kvm -cpu kvm64,+ssse3 -smp 2 -m 8G
>

See comment below on ^^^ ...

> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
> +--------------------------------------------+------------+------------+
> | | b62bc52ffc | 05aa90edc7 |
> +--------------------------------------------+------------+------------+
> | boot_successes | 0 | 0 |
> | boot_failures | 0 | 36 |
> | invalid_opcode:#[##] | 0 | 32 |
> | kernel_BUG_at_arch | 0 | 3 |
> | Kernel_panic-not_syncing:Fatal_exception | 0 | 26 |
> | kernel_BUG_at_arch/x86/kernel/cpu/common.c | 0 | 9 |
> | Kernel_panic-not_syncing:Fatal_exc | 0 | 2 |
> | Kernel_panic-not_syncing:Fatal_exceptf810 | 0 | 1 |
> +--------------------------------------------+------------+------------+
>
>
>
> [ 277.992221] kernel BUG at arch/x86/kernel/cpu/common.c:1061!
> [ 277.993885] invalid opcode: 0000 [#1] SMP
> [ 277.994707] Modules linked in:
> [ 277.995237] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.13.0-00002-g05aa90ed #26
> [ 277.996567] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
> [ 277.998765] task: ffff9b2555034300 task.stack: ffffabde018f0000
> [ 278.000063] RIP: 0010:identify_secondary_cpu+0x6a/0x71
> [ 278.001055] RSP: 0000:ffffabde018f3f10 EFLAGS: 00010086
> [ 278.001699] RAX: 00000000ffffffe4 RBX: ffff9b255f40a100 RCX: 0000000000000007
> [ 278.002621] RDX: 0000000000000000 RSI: ffffffff8c13baf7 RDI: ffff9b255f5ce040
> [ 278.003674] RBP: ffffabde018f3f20 R08: 00000049c6d945a5 R09: 0000000000000001
> [ 278.005029] R10: 0000000000000000 R11: ffffffff90a8af67 R12: 0000000000000001
> [ 278.006221] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> [ 278.007529] FS: 0000000000000000(0000) GS:ffff9b255f400000(0000) knlGS:0000000000000000
> [ 278.009384] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 278.010798] CR2: 0000000000000000 CR3: 00000001b222c000 CR4: 00000000000006e0
> [ 278.012134] Call Trace:
> [ 278.012458] smp_store_cpu_info+0x3e/0x40
> [ 278.013008] start_secondary+0x2f/0xe5
> [ 278.013538] secondary_startup_64+0x9f/0x9f
> [ 278.014083] Code: 0f b7 8b d4 00 00 00 89 c2 44 89 e6 48 c7 c7 19 1f c3 8e e8 55 7c 0b 00 0f b7 bb da 00 00 00 44 89 e6 e8 f9 df 00 00 85 c0 74 02 <0f> 0b 5b 41 5c 5d c3 55 48 89 e5 41 54 53 80 7f 01 08 48 89 fb
> [ 278.017392] RIP: identify_secondary_cpu+0x6a/0x71 RSP: ffffabde018f3f10
> [ 278.018303] ---[ end trace 791e5b1aeb0d5a6c ]---
>
>
> To reproduce:
>
> git clone https://github.com/intel/lkp-tests.git
> cd lkp-tests
> bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email
>

I'm willing to debug but I can't get lkp to work on any system.

# bin/lkp qemu -k /home/linux/vmlinux job-script
make: Entering directory `/root/lkp-tests/bin/event'
gcc -c -o wakeup.o wakeup.c
gcc -o wakeup wakeup.o
rm -f wakeup.o
strip wakeup
make: Leaving directory `/root/lkp-tests/bin/event'
cpio: root:lkp: invalid group
cpio: root:lkp: invalid group
cpio: root:lkp: invalid group
gzip: /root/.lkp/cache/lkp-x86_64.cpio: No such file or directory
mv: cannot stat ‘/root/.lkp/cache/lkp-x86_64.cpio.gz’: No such file or directory
mv: cannot stat ‘/root/.lkp/cache/lkp-x86_64.cgz’: No such file or directory
result_root:
/root/.lkp//result/pm-qa/cpuidle/vm-lkp-nex04-8G/debian-x86_64-2016-08-31.cgz/x86_64-allyesdebian/gcc-6/05aa90edc7910ec3d1ed791fa77371b3acb9bf08/2
downloading initrds ...
/usr/bin/wget -q --local-encoding=UTF-8 --retry-connrefused --waitretry 1000
--tries 1000
https://github.com/0day-ci/lkp-qemu/raw/master/osimage/debian/debian-x86_64-2016-08-31.cgz
-N -P /root/.lkp/cache/osimage/debian
/usr/bin/wget -q --local-encoding=UTF-8 --retry-connrefused --waitretry 1000
--tries 1000
https://github.com/0day-ci/lkp-qemu/raw/master/osimage/deps/debian-x86_64-2016-08-31.cgz/lkp_2017-08-01.cgz
-N -P /root/.lkp/cache/osimage/deps/debian-x86_64-2016-08-31.cgz
Failed to download osimage/deps/debian-x86_64-2016-08-31.cgz/lkp_2017-08-01.cgz

Based on the qemu options above I manually created a guest that does

-smp 2,sockets=2,cores=1,threads=1

and don't see a problem. I also tried some other configs and also don't see a
problem.

Suggestions from the lkp folks on reproducing welcomed,

P.

>
>
> Thanks,
> lkp
>

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