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Date:   Thu, 9 Apr 2020 17:20:24 +0800
From:   kernel test robot <rong.a.chen@...el.com>
To:     Yonghong Song <yhs@...com>
Cc:     Andrii Nakryiko <andriin@...com>, bpf@...r.kernel.org,
        Martin KaFai Lau <kafai@...com>, netdev@...r.kernel.org,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>, kernel-team@...com,
        lkp@...ts.01.org
Subject: [bpf] 1bcd60aafb: canonical_address#:#[##]

FYI, we noticed the following commit (built with gcc-7):

commit: 1bcd60aafb39b0258603f63d5f451d51ecad245c ("[RFC PATCH bpf-next 03/16] bpf: provide a way for targets to register themselves")
url: https://github.com/0day-ci/linux/commits/Yonghong-Song/bpf-implement-bpf-based-dumping-of-kernel-data-structures/20200409-075105
base: https://git.kernel.org/cgit/linux/kernel/git/bpf/bpf-next.git master

in testcase: boot

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):


+------------------------------------------+------------+------------+
|                                          | 034a45e60c | 1bcd60aafb |
+------------------------------------------+------------+------------+
| boot_successes                           | 4          | 0          |
| boot_failures                            | 0          | 4          |
| canonical_address#:#[##]                 | 0          | 4          |
| RIP:mntget                               | 0          | 4          |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 4          |
+------------------------------------------+------------+------------+


If you fix the issue, kindly add following tag
Reported-by: kernel test robot <rong.a.chen@...el.com>


[    0.701420] smpboot: Total of 2 processors activated (11999.99 BogoMIPS)
[    0.704085] devtmpfs: initialized
[    0.705366] x86/mm: Memory block size: 128MB
[    0.710473] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
[    0.711845] futex hash table entries: 512 (order: 3, 32768 bytes, linear)
[    0.713988] general protection fault, probably for non-canonical address 0xcb7b8adb56376100: 0000 [#1] SMP PTI
[    0.715820] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.6.0-02317-g1bcd60aafb39b0 #1
[    0.715820] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[    0.715820] RIP: 0010:mntget+0xd/0x15
[    0.715820] Code: 65 48 33 04 25 28 00 00 00 74 05 e8 9d e2 e5 ff 48 83 c4 30 5b 5d 41 5c 41 5d 41 5e c3 66 66 66 66 90 48 85 ff 48 89 f8 74 07 <48> 8b 57 28 65 ff 02 c3 66 66 66 66 90 53 48 8b 47 20 48 89 fb 48
[    0.715820] RSP: 0000:ffffc90000013e48 EFLAGS: 00010286
[    0.715820] RAX: cb7b8adb56376100 RBX: 0000000000000000 RCX: 0000000000000000
[    0.715820] RDX: 0000000000000001 RSI: ffffc90000013e34 RDI: cb7b8adb56376100
[    0.715820] RBP: ffffc90000013e88 R08: ffffffff8209b97a R09: ffff88822a456370
[    0.715820] R10: 0000000000000044 R11: ffff88822a04efd8 R12: ffffc90000013e84
[    0.715820] R13: ffffffff8226c380 R14: 0000000000000002 R15: ffffffff826d566d
[    0.715820] FS:  0000000000000000(0000) GS:ffff88823fc00000(0000) knlGS:0000000000000000
[    0.715820] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.715820] CR2: 0000000000000000 CR3: 0000000002212000 CR4: 00000000000406f0
[    0.715820] Call Trace:
[    0.715820]  simple_pin_fs+0x75/0x98
[    0.715820]  ? stack_map_init+0x48/0x48
[    0.715820]  __bpfdump_init+0x5a/0xd7
[    0.715820]  ? register_tracer+0x14c/0x1ac
[    0.715820]  do_one_initcall+0x9d/0x1bb
[    0.715820]  kernel_init_freeable+0x1c1/0x224
[    0.715820]  ? rest_init+0xc6/0xc6
[    0.715820]  kernel_init+0xa/0xff
[    0.715820]  ret_from_fork+0x35/0x40
[    0.715820] Modules linked in:
[    0.715855] ---[ end trace 1e6dc54c74784c94 ]---
[    0.717664] RIP: 0010:mntget+0xd/0x15
[    0.719174] Code: 65 48 33 04 25 28 00 00 00 74 05 e8 9d e2 e5 ff 48 83 c4 30 5b 5d 41 5c 41 5d 41 5e c3 66 66 66 66 90 48 85 ff 48 89 f8 74 07 <48> 8b 57 28 65 ff 02 c3 66 66 66 66 90 53 48 8b 47 20 48 89 fb 48
[    0.719837] RSP: 0000:ffffc90000013e48 EFLAGS: 00010286
[    0.721734] RAX: cb7b8adb56376100 RBX: 0000000000000000 RCX: 0000000000000000
[    0.723831] RDX: 0000000000000001 RSI: ffffc90000013e34 RDI: cb7b8adb56376100
[    0.726052] RBP: ffffc90000013e88 R08: ffffffff8209b97a R09: ffff88822a456370
[    0.727834] R10: 0000000000000044 R11: ffff88822a04efd8 R12: ffffc90000013e84
[    0.729939] R13: ffffffff8226c380 R14: 0000000000000002 R15: ffffffff826d566d
[    0.731834] FS:  0000000000000000(0000) GS:ffff88823fc00000(0000) knlGS:0000000000000000
[    0.734900] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.735836] CR2: 0000000000000000 CR3: 0000000002212000 CR4: 00000000000406f0
[    0.738028] Kernel panic - not syncing: Fatal exception

Elapsed time: 60

qemu-img create -f qcow2 disk-vm-snb-ssd-31-0 256G
qemu-img create -f qcow2 disk-vm-snb-ssd-31-1 256G


To reproduce:

        # build kernel
	cd linux
	cp config-5.6.0-02317-g1bcd60aafb39b0 .config
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_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,
Rong Chen


View attachment "config-5.6.0-02317-g1bcd60aafb39b0" of type "text/plain" (115471 bytes)

View attachment "job-script" of type "text/plain" (4829 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (6576 bytes)

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