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

commit: e692535ca01126a764ee1c3ac1b352c88c10070b ("hugetlbfs: Convert to fs_context")
https://git.kernel.org/cgit/linux/kernel/git/viro/vfs.git mount-fixes2

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu host -smp 2 -m 2G

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


+-------------------------------------------------------------------------------------------------------------+------------+------------+
|                                                                                                             | 4531d23f8f | e692535ca0 |
+-------------------------------------------------------------------------------------------------------------+------------+------------+
| boot_successes                                                                                              | 0          | 0          |
| boot_failures                                                                                               | 20         | 16         |
| kernel_BUG_at_include/linux/fs.h                                                                            | 20         |            |
| invalid_opcode:#[##]                                                                                        | 20         |            |
| RIP:__fput                                                                                                  | 20         |            |
| Kernel_panic-not_syncing:Fatal_exception                                                                    | 20         |            |
| BUG_hugetlbfs_inode_cache(Not_tainted):Objects_remaining_in_hugetlbfs_inode_cache_on__kmem_cache_shutdown() | 0          | 16         |
| INFO:Slab0x(ptrval)objects=#used=#fp=0x(ptrval)flags=                                                       | 0          | 16         |
| INFO:Object0x(ptrval)@offset=                                                                               | 0          | 16         |
+-------------------------------------------------------------------------------------------------------------+------------+------------+



[    1.997041] hpet0: 3 comparators, 64-bit 100.000000 MHz counter
[    2.003127] clocksource: Switched to clocksource kvm-clock
[    2.245168] VFS: Disk quotas dquot_6.6.0
[    2.252987] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[    2.264260] =============================================================================
[    2.265034] BUG hugetlbfs_inode_cache (Not tainted): Objects remaining in hugetlbfs_inode_cache on __kmem_cache_shutdown()
[    2.265034] -----------------------------------------------------------------------------
[    2.265034] 
[    2.265034] Disabling lock debugging due to kernel taint
[    2.265034] INFO: Slab 0x        (ptrval) objects=25 used=2 fp=0x        (ptrval) flags=0xfffffc0008100
[    2.265034] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G    B             4.17.0-rc5-00190-ge692535 #1
[    2.265034] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[    2.265034] Call Trace:
[    2.265034]  dump_stack+0x5c/0x7b
[    2.265034]  slab_err+0x9e/0xb0
[    2.265034]  ? on_each_cpu_cond+0xb2/0x150
[    2.265034]  ? __kmalloc+0x1ee/0x230
[    2.265034]  __kmem_cache_shutdown+0x188/0x3a0
[    2.265034]  ? cpumask_next+0x17/0x20
[    2.265034]  shutdown_cache+0x15/0x1b0
[    2.265034]  kmem_cache_destroy+0x1e0/0x1f0
[    2.265034]  init_hugetlbfs_fs+0x85/0x161
[    2.265034]  ? init_ramfs_fs+0x20/0x20
[    2.265034]  ? set_debug_rodata+0x11/0x11
[    2.265034]  do_one_initcall+0x36/0x1bb
[    2.265034]  kernel_init_freeable+0x1ab/0x240
[    2.265034]  ? rest_init+0xd0/0xd0
[    2.265034]  kernel_init+0xa/0x110
[    2.265034]  ret_from_fork+0x35/0x40
[    2.265034] INFO: Object 0x        (ptrval) @offset=0
[    2.265034] INFO: Object 0x        (ptrval) @offset=632
[    2.518522] kmem_cache_destroy hugetlbfs_inode_cache: Slab cache still has objects
[    2.530732] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G    B             4.17.0-rc5-00190-ge692535 #1
[    2.531633] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[    2.531633] Call Trace:
[    2.531633]  dump_stack+0x5c/0x7b
[    2.531633]  kmem_cache_destroy+0x1d3/0x1f0
[    2.531633]  init_hugetlbfs_fs+0x85/0x161
[    2.531633]  ? init_ramfs_fs+0x20/0x20
[    2.531633]  ? set_debug_rodata+0x11/0x11
[    2.531633]  do_one_initcall+0x36/0x1bb
[    2.531633]  kernel_init_freeable+0x1ab/0x240
[    2.531633]  ? rest_init+0xd0/0xd0
[    2.531633]  kernel_init+0xa/0x110
[    2.531633]  ret_from_fork+0x35/0x40
[    2.653396] pnp: PnP ACPI init
[    2.660462] pnp 00:00: Plug and Play ACPI device, IDs PNP0b00 (active)
[    2.672477] pnp 00:01: Plug and Play ACPI device, IDs PNP0303 (active)
[    2.685601] pnp 00:02: Plug and Play ACPI device, IDs PNP0f13 (active)
[    2.698958] pnp 00:03: [dma 2]


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