linux-kernel - [lkp-robot] [kernfs, sysfs, cgroup, intel_rdt] f82b0d1249: kernel_BUG_at

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Message-ID: <20180423012123.GM5563@yexl-desktop>
Date:   Mon, 23 Apr 2018 09:21:23 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     David Howells <dhowells@...hat.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Howells <dhowells@...hat.com>, lkp@...org
Subject: [lkp-robot] [kernfs, sysfs, cgroup, intel_rdt]  f82b0d1249:
 kernel_BUG_at_fs/super.c


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

commit: f82b0d1249c32dec1ae94fd8caf478627c4752b7 ("kernfs, sysfs, cgroup, intel_rdt: Support fs_context")
https://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git mount-context

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -m 420M

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


+------------------------------------------+------------+------------+
|                                          | dc05250a5d | f82b0d1249 |
+------------------------------------------+------------+------------+
| boot_successes                           | 8          | 2          |
| boot_failures                            | 0          | 6          |
| kernel_BUG_at_fs/super.c                 | 0          | 6          |
| invalid_opcode:#[##]                     | 0          | 6          |
| EIP:vfs_get_tree                         | 0          | 6          |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 6          |
+------------------------------------------+------------+------------+



[   12.883078] kernel BUG at fs/super.c:1770!
[   12.884210] invalid opcode: 0000 [#1] SMP
[   12.884971] Modules linked in:
[   12.885574] CPU: 0 PID: 1 Comm: init Not tainted 4.17.0-rc1-00015-gf82b0d1 #1
[   12.886947] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[   12.888553] EIP: vfs_get_tree+0xe7/0x223
[   12.889316] EFLAGS: 00010286 CPU: 0
[   12.889971] EAX: 00000030 EBX: 998cf900 ECX: 81cd3748 EDX: 00000208
[   12.891125] ESI: 00000000 EDI: 0000000f EBP: 9508def4 ESP: 9508dedc
[   12.892289]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[   12.893273] CR0: 80050033 CR2: 77ee0588 CR3: 0da6b000 CR4: 00000690
[   12.894437] Call Trace:
[   12.894906]  do_mount+0x10d1/0x142e
[   12.895545]  ksys_mount+0xe6/0x10a
[   12.896198]  sys_mount+0x1c/0x1e
[   12.896807]  do_int80_syscall_32+0xaa/0x24c
[   12.897594]  entry_INT80_32+0x33/0x33
[   12.898301] EIP: 0x77ed7c3e
[   12.898829] EFLAGS: 00000216 CPU: 0
[   12.899473] EAX: ffffffda EBX: 0804a3a9 ECX: 0804a3a1 EDX: 0804a3a9
[   12.900623] ESI: 0000000e EDI: 00000000 EBP: 7f837128 ESP: 7f83708c
[   12.901803]  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[   12.902846] Code: 31 c0 85 d2 0f 94 c0 85 d2 8b 34 85 a8 d6 e1 81 8d 4e 01 89 0c 85 a8 d6 e1 81 75 11 8b 43 04 ff 30 68 49 f5 bf 81 e8 13 f4 eb ff <0f> 0b 8b b2 90 00 00 00 8b 86 b4 00 00 00 6a 00 85 c0 89 45 f0 
[   12.906406] EIP: vfs_get_tree+0xe7/0x223 SS:ESP: 0068:9508dedc
[   12.907554] ---[ end trace 62f67c394754d33a ]---


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-4.17.0-rc1-00015-gf82b0d1" of type "text/plain" (119092 bytes)

View attachment "job-script" of type "text/plain" (4092 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (11340 bytes)