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References: <20200831182210.850852-4-jim.cromie@gmail.com> <20200902074124.GP4299@shao2-debian>
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From:   jim.cromie@gmail.com
Date:   Tue, 8 Sep 2020 00:54:37 -0400
Message-ID: <CAJfuBxy2kMcPRTux=ZogVCB7Uw-kSONyUyi9T_VKwu5TCDGgNA@mail.gmail.com>
Subject: Re: [dyndbg] 70f06a871f: kernel_BUG_at_lib/dynamic_debug.c
To:     kernel test robot <lkp@intel.com>
Cc:     Jason Baron <jbaron@akamai.com>,
        Greg KH <gregkh@linuxfoundation.org>,
        LKML <linux-kernel@vger.kernel.org>, lkp@lists.01.org
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Sender: linux-kernel-owner@vger.kernel.org
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Got it.
will investigate asap

On Wed, Sep 2, 2020 at 3:42 AM kernel test robot <lkp@intel.com> wrote:
>
> Greeting,
>
> FYI, we noticed the following commit (built with gcc-9):
>
> commit: 70f06a871f5d40ca8f977eb412358ab03b6804da ("[PATCH v3 3/3] dyndbg:=
 fix problem parsing format=3D"foo bar"")
> url: https://github.com/0day-ci/linux/commits/Jim-Cromie/dyndbg-cleanups-=
for-5-9/20200901-022403
> base: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git f75=
aef392f869018f78cfedf3c320a6b3fcfda6b
>
> in testcase: kernel-selftests
> with following parameters:
>
>         group: kselftests-livepatch
>
> test-description: The kernel contains a set of "self tests" under the too=
ls/testing/selftests/ directory. These are intended to be small unit tests =
to exercise individual code paths in the kernel.
> test-url: https://www.kernel.org/doc/Documentation/kselftest.txt
>
>
> on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -=
m 8G
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/=
backtrace):
>
>
> +------------------------------------------+------------+------------+
> |                                          | 12aeaa9439 | 70f06a871f |
> +------------------------------------------+------------+------------+
> | boot_successes                           | 6          | 2          |
> | boot_failures                            | 0          | 4          |
> | kernel_BUG_at_lib/dynamic_debug.c        | 0          | 4          |
> | invalid_opcode:#[##]                     | 0          | 4          |
> | RIP:ddebug_exec_query                    | 0          | 4          |
> | Kernel_panic-not_syncing:Fatal_exception | 0          | 4          |
> +------------------------------------------+------------+------------+
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <lkp@intel.com>
>
>
> [   78.796907] kernel BUG at lib/dynamic_debug.c:267!
> [   78.799930] invalid opcode: 0000 [#1] PREEMPT SMP PTI
> [   78.801632] CPU: 1 PID: 1068 Comm: test-livepatch. Tainted: G         =
     K   5.9.0-rc3-00003-g70f06a871f5d4 #1
> [   78.803877] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIO=
S 1.12.0-1 04/01/2014
> [   78.805929] RIP: 0010:ddebug_exec_query+0x684/0x760
> [   78.807642] Code: 0f 85 c0 08 00 00 4c 89 7c 24 28 e9 2d fc ff ff 4c 8=
9 fe 48 8d 7c 24 10 e8 a9 f8 ff ff 85 c0 0f 84 18 fc ff ff e9 c1 07 00 00 <=
0f> 0b 8b 15 ac 37 e2 02 85 d2 0f 85 c1 00 00 00 45 31 e4 48 c7 c6
> [   78.812169] RSP: 0018:ffffb325411c7d78 EFLAGS: 00010246
> [   78.815411] RAX: 000000000000003d RBX: ffff9f4dab69286c RCX: 000000000=
0000000
> [   78.821166] RDX: 000000000000003d RSI: ffff9f4dab692868 RDI: ffff9f4da=
b69286c
> [   78.823160] RBP: 0000000000000004 R08: ffff9f4dab69286e R09: 000000000=
0000001
> [   78.825172] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000=
0000004
> [   78.827212] R13: 0000000000000004 R14: 0000000000000000 R15: 000000000=
0000000
> [   78.829228] FS:  00007f024c29c740(0000) GS:ffff9f4e77d00000(0000) knlG=
S:0000000000000000
> [   78.831343] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [   78.833243] CR2: 00007f024c45c8a0 CR3: 0000000168360000 CR4: 000000000=
00406e0
> [   78.835312] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000000000=
0000000
> [   78.837371] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 000000000=
0000400
> [   78.839398] Call Trace:
> [   78.840935]  ? __might_fault+0x36/0x80
> [   78.842574]  ddebug_exec_queries+0x6a/0x100
> [   78.844322]  ddebug_proc_write+0x4e/0x80
> [   78.845985]  full_proxy_write+0x56/0x80
> [   78.847621]  vfs_write+0xec/0x240
> [   78.849189]  ksys_write+0x68/0xe0
> [   78.850738]  do_syscall_64+0x33/0x40
> [   78.852347]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [   78.854106] RIP: 0033:0x7f024c389504
> [   78.855634] Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b3 0f 1f 8=
0 00 00 00 00 48 8d 05 f9 61 0d 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 <=
48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 49 89 d4 55 48 89 f5 53
> [   78.860364] RSP: 002b:00007fff5962d2b8 EFLAGS: 00000246 ORIG_RAX: 0000=
000000000001
> [   78.864609] RAX: ffffffffffffffda RBX: 00000000000000bc RCX: 00007f024=
c389504
> [   78.866696] RDX: 00000000000000bc RSI: 00005582ce63dcd0 RDI: 000000000=
0000001
> [   78.868751] RBP: 00005582ce63dcd0 R08: fffffffffffffff0 R09: 00007f024=
c419e80
> [   78.870832] R10: 00005582ce63dd8c R11: 0000000000000246 R12: 00007f024=
c45b760
> [   78.872933] R13: 00000000000000bc R14: 00007f024c456760 R15: 000000000=
00000bc
> [   78.875077] Modules linked in: intel_rapl_msr intel_rapl_common snd_pc=
m sr_mod cdrom sg crct10dif_pclmul ppdev crc32_pclmul snd_timer bochs_drm c=
rc32c_intel ata_generic ghash_clmulni_intel snd pata_acpi drm_vram_helper a=
esni_intel drm_ttm_helper crypto_simd ttm cryptd ata_piix glue_helper sound=
core joydev pcspkr serio_raw parport_pc libata parport ipmi_devintf ipmi_ms=
ghandler floppy i2c_piix4 ip_tables [last unloaded: test_klp_atomic_replace=
]
> [   78.889926] ---[ end trace aae1acea69a78e4f ]---
>
>
> To reproduce:
>
>         # build kernel
>         cd linux
>         cp config-5.9.0-rc3-00003-g70f06a871f5d4 .config
>         make HOSTCC=3Dgcc-9 CC=3Dgcc-9 ARCH=3Dx86_64 olddefconfig prepare=
 modules_prepare bzImage
>
>         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,
> lkp
>