linux-kernel - [lkp-robot] [kernfs, sysfs, cgroup, intel_rdt] 5445a00931: kernel_BUG_at

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Date:   Mon, 15 Jan 2018 21:44:26 +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]  5445a00931:
 kernel_BUG_at_fs/super.c


FYI, we noticed the following commit (built with gcc-4.9):

commit: 5445a009312c31fee7edcb8724cfea08dade66f9 ("kernfs, sysfs, cgroup, intel_rdt: Support fs_context")
https://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git mount-context

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-i386 -enable-kvm -m 256M

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


+-------------------------------------------------------+------------+------------+
|                                                       | c118129c37 | 5445a00931 |
+-------------------------------------------------------+------------+------------+
| boot_successes                                        | 0          | 0          |
| boot_failures                                         | 10         | 12         |
| WARNING:possible_circular_locking_dependency_detected | 10         | 12         |
| kernel_BUG_at_fs/super.c                              | 0          | 10         |
| invalid_opcode:#[##]                                  | 0          | 10         |
| EIP:vfs_get_tree                                      | 0          | 10         |
| Kernel_panic-not_syncing:Fatal_exception              | 0          | 10         |
+-------------------------------------------------------+------------+------------+



[   13.821185] kernel BUG at fs/super.c:1715!
[   13.821985] invalid opcode: 0000 [#1] PREEMPT
[   13.822564] Modules linked in:
[   13.822986] CPU: 0 PID: 1 Comm: init Not tainted 4.15.0-rc1-00102-g5445a00 #2
[   13.823959] task: 8d868000 task.stack: 8d854000
[   13.824559] EIP: vfs_get_tree+0x119/0x120
[   13.825104] EFLAGS: 00010282 CPU: 0
[   13.825571] EAX: 00000030 EBX: 8f5f2800 ECX: 810b1076 EDX: 00000292
[   13.826405] ESI: 00000000 EDI: 8d855f3c EBP: 8d855f08 ESP: 8d855ef0
[   13.827240]  DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068
[   13.827956] CR0: 80050033 CR2: 77e9f588 CR3: 097203e0 CR4: 000006b0
[   13.828763] Call Trace:
[   13.829117]  do_mount+0x200/0xce0
[   13.829566]  ? copy_mount_options+0xe/0x280
[   13.830142]  SyS_mount+0x5d/0xb0
[   13.830580]  do_int80_syscall_32+0x67/0x190
[   13.831165]  entry_INT80_32+0x36/0x36
[   13.831505] EIP: 0x77e96c3e
[   13.831768] EFLAGS: 00000216 CPU: 0
[   13.832125] EAX: ffffffda EBX: 0804a3a9 ECX: 0804a3a1 EDX: 0804a3a9
[   13.832708] ESI: 0000000e EDI: 00000000 EBP: 7ff43668 ESP: 7ff435cc
[   13.833295]  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[   13.833909] Code: c7 43 08 00 00 00 00 e8 36 dc ff ff b8 f4 ff ff ff e9 7b ff ff ff 8b 43 04 8b 00 c7 04 24 5c 76 ae 81 89 44 24 04 e8 30 40 ed ff <0f> 0b 90 90 90 90 90 55 89 e5 e8 6c 51 e6 ff 5d 89 c8 c3 8d 74
[   13.835681] EIP: vfs_get_tree+0x119/0x120 SS:ESP: 0068:8d855ef0
[   13.836305] ---[ end trace 4839f16c2d6e315e ]---


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-4.15.0-rc1-00102-g5445a00" of type "text/plain" (126628 bytes)

View attachment "job-script" of type "text/plain" (3909 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (12988 bytes)