FYI, we noticed the following commit (built with gcc-7): commit: 5aad04554302fc1fbb5924d0f8f68946ec5c06f7 ("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-x86_64 -enable-kvm -m 420M caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +-------------------------------------------------------+------------+------------+ | | b3f3ae1a5f | 5aad045543 | +-------------------------------------------------------+------------+------------+ | boot_successes | 0 | 0 | | boot_failures | 12 | 14 | | WARNING:possible_circular_locking_dependency_detected | 12 | 14 | | kernel_BUG_at_fs/super.c | 0 | 4 | | invalid_opcode:#[##] | 0 | 4 | | RIP:vfs_get_tree | 0 | 4 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 4 | +-------------------------------------------------------+------------+------------+ [ 23.386679] kernel BUG at fs/super.c:1703! [ 23.387314] invalid opcode: 0000 [#1] [ 23.387715] CPU: 0 PID: 1 Comm: init Not tainted 4.15.0-rc1-00105-g5aad045 #167 [ 23.388531] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 [ 23.389749] task: ffff880018c7c000 task.stack: ffff880018c80000 [ 23.390414] RIP: 0010:vfs_get_tree+0x10f/0x2e0 [ 23.390891] RSP: 0000:ffff880018c83e18 EFLAGS: 00010293 [ 23.391489] RAX: ffff880018c7c000 RBX: ffff880012cb5748 RCX: ffffffff8130d14f [ 23.392286] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff842fa518 [ 23.393062] RBP: ffff880018c83e38 R08: 0000000000000000 R09: 0000000000000001 [ 23.393810] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000003 [ 23.394569] R13: 0000000000000000 R14: ffff880012cb5748 R15: 0000000000000000 [ 23.395373] FS: 0000000000000000(0000) GS:ffffffff83e8b000(0063) knlGS:00000000f7f89690 [ 23.396224] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 23.396845] CR2: 00000000f7f12588 CR3: 0000000012cb7000 CR4: 00000000000006b0 [ 23.397648] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 23.398415] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 23.399144] Call Trace: [ 23.399423] ? vfs_set_fs_source+0xf0/0xf0 [ 23.399852] do_mount+0x145e/0x1750 [ 23.400232] ? strndup_user+0xca/0xe0 [ 23.400624] compat_SyS_mount+0x36a/0x3b0 [ 23.401041] do_int80_syscall_32+0xd3/0x440 [ 23.401520] entry_INT80_compat+0x32/0x40 [ 23.402111] RIP: 0023:0xf7f09c3e [ 23.402474] RSP: 002b:00000000fff69eec EFLAGS: 00000296 ORIG_RAX: 0000000000000015 [ 23.403256] RAX: ffffffffffffffda RBX: 000000000804a3a9 RCX: 000000000804a3a1 [ 23.404003] RDX: 000000000804a3a9 RSI: 000000000000000e RDI: 0000000000000000 [ 23.404733] RBP: 00000000fff69f88 R08: 0000000000000000 R09: 0000000000000000 [ 23.405490] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 23.406238] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 23.407028] Code: 84 4d 85 ed 41 0f 94 c4 31 c9 31 d2 44 89 e6 49 83 c4 02 e8 64 f6 ec ff 4a 83 04 e5 28 81 4e 84 01 4d 85 ed 75 07 e8 d1 cb ea ff <0f> 0b e8 ca cb ea ff 48 8b 43 10 45 31 ed 48 c7 c7 e8 a4 2f 84 [ 23.409202] RIP: vfs_get_tree+0x10f/0x2e0 RSP: ffff880018c83e18 [ 23.409895] ---[ end trace 7d8f303e5dad7e64 ]--- To reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k job-script # job-script is attached in this email Thanks, Xiaolong