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