linux-kernel - [lkp-robot] [x86/asm] f5caf621ee: PANIC:double

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Date:   Thu, 28 Sep 2017 15:47:58 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Alexander Potapenko <glider@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Dmitriy Vyukov <dvyukov@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Miguel Bernal Marin <miguel.bernal.marin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [lkp-robot] [x86/asm]  f5caf621ee: PANIC:double_fault


FYI, we noticed the following commit:

commit: f5caf621ee357279e759c0911daf6d55c7d36f03 ("x86/asm: Fix inline asm call constraints for Clang")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.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-x86_64 -enable-kvm -m 420M

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+-----------------------------------------+------------+------------+
|                                         | 0d0970eef3 | f5caf621ee |
+-----------------------------------------+------------+------------+
| boot_successes                          | 9          | 4          |
| boot_failures                           | 0          | 4          |
| PANIC:double_fault                      | 0          | 4          |
| Kernel_panic-not_syncing:Machine_halted | 0          | 4          |
+-----------------------------------------+------------+------------+



[    7.757440] udevtrigger (130) used greatest stack depth: 12344 bytes left
[    8.262143] procd: - ubus -
[    9.279484] procd: - init -
Please press Enter to activate this console.
[    9.349553] find (656) used greatest stack depth: 12296 bytes left
[   10.584905] PANIC: double fault, error_code: 0x0
[   10.585372] CPU: 0 PID: 917 Comm: netifd Not tainted 4.14.0-rc1-00015-gf5caf62 #2
[   10.586062] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
[   10.586978] task: ffff8800141a8000 task.stack: ffffc90000274000
[   10.587519] RIP: 0010:compat_sock_ioctl+0xfea/0x103e
[   10.587974] RSP: 0000:0000000000277d78 EFLAGS: 00010283
[   10.588448] RAX: 0000000000277d78 RBX: 0000000000008933 RCX: ffff8800141a8000
[   10.589103] RDX: 0000000000000020 RSI: 00000000fffbea00 RDI: 00000000fffbea50
[   10.589757] RBP: ffffc90000277e18 R08: fffbea50fffbea34 R09: ffffffff814a68c9
[   10.590407] R10: ffffff9c00000002 R11: 00000000fffbea50 R12: 0000000000000000
[   10.591056] R13: ffff880012c8c880 R14: 00000000fffbea50 R15: 00000000fffbea00
[   10.591708] FS:  0000000000000000(0000) GS:ffff880019a00000(0063) knlGS:00000000f7fab9a0
[   10.592446] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   10.592973] CR2: 0000000000277d68 CR3: 000000001807f000 CR4: 00000000000006b0
[   10.593623] Call Trace:
[   10.593858] Code: 02 0f ff 65 48 8b 04 25 80 d1 00 00 48 8b 80 28 25 00 00 48 83 e8 20 49 39 c7 77 34 89 e0 4c 89 f7 4c 89 fe ba 20 00 00 00 89 c4 <e8> b3 52 05 00 85 c0 74 22 eb 1a 4c 89 fa 89 de 4c 89 ef e8 c6 
[   10.595705] Kernel panic - not syncing: Machine halted.
[   10.596181] CPU: 0 PID: 917 Comm: netifd Not tainted 4.14.0-rc1-00015-gf5caf62 #2
[   10.596868] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
[   10.597786] Call Trace:
[   10.598017]  <#DF>
[   10.598216]  dump_stack+0x8f/0xc4
[   10.598527]  panic+0xda/0x22f
[   10.598811]  df_debug+0x30/0x30
[   10.599104]  do_double_fault+0x9b/0xaf
[   10.599456]  double_fault+0x22/0x30
[   10.599791] RIP: 0010:compat_sock_ioctl+0xfea/0x103e
[   10.600247] RSP: 0000:0000000000277d78 EFLAGS: 00010283
[   10.600733] RAX: 0000000000277d78 RBX: 0000000000008933 RCX: ffff8800141a8000
[   10.601381] RDX: 0000000000000020 RSI: 00000000fffbea00 RDI: 00000000fffbea50
[   10.602036] RBP: ffffc90000277e18 R08: fffbea50fffbea34 R09: ffffffff814a68c9
[   10.602700] R10: ffffff9c00000002 R11: 00000000fffbea50 R12: 0000000000000000
[   10.603349] R13: ffff880012c8c880 R14: 00000000fffbea50 R15: 00000000fffbea00
[   10.604002]  ? dev_ioctl+0x2d7/0x5e3
[   10.604336] WARNING: kernel stack regs at ffff880019a05f58 in netifd:917 has bad 'bp' value ffffc90000277e18
[   10.604337] unwind stack type:0 next_sp:0000000000277d78 mask:0x10 graph_idx:0
[   10.604339] ffff880019a05d48: ffff880019a05e28 (0xffff880019a05e28)
[   10.604340] ffff880019a05d50: ffffffff8100ce27 (show_trace_log_lvl+0x203/0x2a7)
[   10.604342] ffff880019a05d58: ffffffff81473d28 (compat_sock_ioctl+0xfea/0x103e)


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



Thanks,
Xiaolong

View attachment "config-4.14.0-rc1-00015-gf5caf62" of type "text/plain" (110204 bytes)

View attachment "job-script" of type "text/plain" (3788 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (11008 bytes)