Re: [x86/mm] e2a7dcce31: kernel_BUG_at_arch/x86/mm/tlb.c

Andy Lutomirski
2017-05-27T16:01:03Z

On Sat, May 27, 2017 at 6:31 AM, kernel test robot
<xiaolong.ye@intel.com> wrote:
>
> FYI, we noticed the following commit:
>
> commit: e2a7dcce31f10bd7471b4245a6d1f2de344e7adf ("x86/mm: Rework lazy TLB to track the actual loaded mm")
> https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git x86/tlbflush_cleanup

Ugh, there's an unpleasant interaction between this patch and
intel_idle. I suspect that the intel_idle code in question is either
wrong or pointless, but I want to investigate further. Ingo, can you
hold off on applying this patch?

>
> in testcase: will-it-scale
> with following parameters:
>
> test: readseek2
> cpufreq_governor: performance
>
> test-description: Will It Scale takes a testcase and runs it from 1 through to n parallel copies to see if the testcase will scale. It builds both a process and threads based test in order to see any differences between the two.
> test-url: https://github.com/antonblanchard/will-it-scale
>
>
> on test machine: 32 threads Intel(R) Xeon(R) CPU E5-2680 0 @ 2.70GHz with 64G memory
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
> +------------------------------------------+------------+------------+
> | | ed3e5f1969 | e2a7dcce31 |
> +------------------------------------------+------------+------------+
> | boot_successes | 11 | 1 |
> | boot_failures | 0 | 4 |
> | kernel_BUG_at_arch/x86/mm/tlb.c | 0 | 4 |
> | invalid_opcode:#[##] | 0 | 4 |
> | Kernel_panic-not_syncing:Fatal_exception | 0 | 4 |
> +------------------------------------------+------------+------------+
>
>
>
> [ 22.777203] kernel BUG at arch/x86/mm/tlb.c:39!
> [ 22.784095] invalid opcode: 0000 [#1] SMP
> [ 22.788850] Modules linked in: ip_tables
> [ 22.793503] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.12.0-rc2-00061-ge2a7dcc #1
> [ 22.802448] Hardware name: Intel Corporation S2600CP/S2600CP, BIOS SE5C600.86B.99.99.x036.091920111209 09/19/2011
> [ 22.814399] task: ffff88081bb725c0 task.stack: ffffc90006358000
> [ 22.821303] RIP: 0010:leave_mm+0x39/0x40
> [ 22.825950] RSP: 0018:ffffc9000635be48 EFLAGS: 00010046
> [ 22.832065] RAX: 0000000000000001 RBX: ffffffff81fa8ba0 RCX: 000000000000001f
> [ 22.840312] RDX: ffffffff81f1f9a0 RSI: ffffffff81fa8ba0 RDI: 0000000000000002
> [ 22.848568] RBP: ffffc9000635be70 R08: 0000000000000760 R09: 0000000000000008
> [ 22.856823] R10: ffffc9000635be50 R11: 0000000000000760 R12: 0000000000000004
> [ 22.865069] R13: 0000000000000005 R14: 0000000000000030 R15: ffffffff81fa8d80
> [ 22.873325] FS: 0000000000000000(0000) GS:ffff88081f280000(0000) knlGS:0000000000000000
> [ 22.882838] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 22.889527] CR2: 000055635b17b0b8 CR3: 0000000001e09000 CR4: 00000000000406e0
> [ 22.897780] Call Trace:
> [ 22.900782] ? intel_idle+0x109/0x110
> [ 22.905159] cpuidle_enter_state+0xf2/0x2d0
> [ 22.910118] cpuidle_enter+0x17/0x20
> [ 22.914388] call_cpuidle+0x23/0x40
> [ 22.918551] do_idle+0x189/0x1e0
> [ 22.922431] cpu_startup_entry+0x1d/0x20
> [ 22.927091] start_secondary+0x107/0x130
> [ 22.931750] secondary_startup_64+0x9f/0x9f
> [ 22.936692] Code: 8b 05 04 bd fa 7e 83 f8 01 74 20 48 81 fa a0 f9 f1 81 74 15 55 31 d2 48 c7 c6 a0 f9 f1 81 31 ff 48 89 e5 e8 9a ff ff ff 5d f3 c3 <0f> 0b 0f 1f 44 00 00 66 66 66 66 90 55 48 8b 05 37 f5 02 01 48
> [ 22.958497] RIP: leave_mm+0x39/0x40 RSP: ffffc9000635be48
> [ 22.964859] ---[ end trace 1426870dcae851dd ]---
>
>
> To reproduce:
>
> git clone https://github.com/01org/lkp-tests.git
> cd lkp-tests
> bin/lkp install job.yaml # job file is attached in this email
> bin/lkp run job.yaml
>
>
>
> Thanks,
> Kernel Test Robot