FYI, we noticed the following commit (built with gcc-7):
commit: e979e5a0591e70ad0b41cf876ee987de468a220e ("hugetlbfs: Convert to 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 -smp 2 -m 512M
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
+-------------------------------------------------------------------------------------------------------------+------------+------------+
| | 838d9ecc64 | e979e5a059 |
+-------------------------------------------------------------------------------------------------------------+------------+------------+
| boot_successes | 0 | 0 |
| boot_failures | 54 | 17 |
| BUG:stack_guard_page_was_hit_at#(stack_is#..#) | 54 | |
| RIP:legacy_parse_monolithic | 54 | |
| Kernel_panic-not_syncing:Fatal_exception | 54 | |
| BUG_hugetlbfs_inode_cache(Not_tainted):Objects_remaining_in_hugetlbfs_inode_cache_on__kmem_cache_shutdown() | 0 | 17 |
| INFO:Slab#objects=#used=#fp=#flags= | 0 | 17 |
| INFO:Object#@offset= | 0 | 17 |
+-------------------------------------------------------------------------------------------------------------+------------+------------+
[ 0.160565] PCI: pci_cache_line_size set to 64 bytes
[ 0.161260] e820: reserve RAM buffer [mem 0x0009fc00-0x0009ffff]
[ 0.161969] e820: reserve RAM buffer [mem 0x1ffe0000-0x1fffffff]
[ 0.163220] clocksource: Switched to clocksource kvm-clock
[ 0.175560] =============================================================================
[ 0.176568] BUG hugetlbfs_inode_cache (Not tainted): Objects remaining in hugetlbfs_inode_cache on __kmem_cache_shutdown()
[ 0.176640] -----------------------------------------------------------------------------
[ 0.176640]
[ 0.176640] Disabling lock debugging due to kernel taint
[ 0.176640] INFO: Slab 0x000000006376557a objects=17 used=1 fp=0x00000000154e780a flags=0x4000000000008100
[ 0.176640] CPU: 0 PID: 1 Comm: swapper Tainted: G B 4.16.0-10623-ge979e5a #1
[ 0.176640] Call Trace:
[ 0.176640] slab_err+0xad/0xcf
[ 0.176640] ? __kmem_cache_shutdown+0x93/0x301
[ 0.176640] ? __need_fs_reclaim+0x5/0x4e
[ 0.176640] ? prefetch_freepointer+0x5/0x14
[ 0.176640] ? __kmalloc+0x122/0x1c4
[ 0.176640] __kmem_cache_shutdown+0x163/0x301
[ 0.176640] shutdown_cache+0x14/0xf7
[ 0.176640] kmem_cache_destroy+0x15c/0x1a5
[ 0.176640] init_hugetlbfs_fs+0x85/0x15c
[ 0.176640] ? init_ramfs_fs+0x1f/0x1f
[ 0.176640] ? set_debug_rodata+0x11/0x11
[ 0.176640] do_one_initcall+0x9c/0x148
[ 0.176640] kernel_init_freeable+0x11b/0x1a8
[ 0.176640] ? rest_init+0x119/0x119
[ 0.176640] kernel_init+0xa/0xe1
[ 0.176640] ret_from_fork+0x3a/0x50
[ 0.176640] INFO: Object 0x00000000e4f03853 @offset=12768
[ 0.190206] kmem_cache_destroy hugetlbfs_inode_cache: Slab cache still has objects
[ 0.191091] CPU: 0 PID: 1 Comm: swapper Tainted: G B 4.16.0-10623-ge979e5a #1
[ 0.192084] Call Trace:
[ 0.192383] kmem_cache_destroy+0x175/0x1a5
[ 0.192889] init_hugetlbfs_fs+0x85/0x15c
[ 0.193362] ? init_ramfs_fs+0x1f/0x1f
[ 0.193809] ? set_debug_rodata+0x11/0x11
[ 0.194282] do_one_initcall+0x9c/0x148
[ 0.194738] kernel_init_freeable+0x11b/0x1a8
[ 0.195249] ? rest_init+0x119/0x119
[ 0.195673] kernel_init+0xa/0xe1
[ 0.196091] ret_from_fork+0x3a/0x50
[ 0.196575] pnp: PnP ACPI init
[ 0.197162] pnp 00:00: Plug and Play ACPI device, IDs PNP0b00 (active)
[ 0.198248] pnp 00:01: Plug and Play ACPI device, IDs PNP0303 (active)
[ 0.199306] pnp 00:02: Plug and Play ACPI device, IDs PNP0f13 (active)
[ 0.200357] 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