FYI, we noticed the following commit: commit: bc23f687213e9aaca0f81b7063751f1d3791917b ("net: define usercopy region in struct proto slab cache") https://git.kernel.org/cgit/linux/kernel/git/kees/linux.git kspp/usercopy-whitelist/latest 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 -cpu Westmere -m 512M caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +------------------------------------------+------------+------------+ | | 4feb522782 | bc23f68721 | +------------------------------------------+------------+------------+ | boot_successes | 4 | 2 | | boot_failures | 0 | 6 | | kernel_BUG_at_mm/slab_common.c | 0 | 6 | | invalid_opcode:#[##] | 0 | 6 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 6 | +------------------------------------------+------------+------------+ [ 14.931018] kernel BUG at mm/slab_common.c:469! [ 14.943838] invalid opcode: 0000 [#1] SMP [ 14.948874] Modules linked in: sctp(+) dccp_ipv4 dccp [ 14.950762] CPU: 0 PID: 231 Comm: modprobe Not tainted 4.12.0-rc5-00027-gbc23f68 #1 [ 14.957836] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014 [ 14.968452] task: ffff88001f558000 task.stack: ffffc90000338000 [ 14.969974] RIP: 0010:kmem_cache_create_usercopy+0x200/0x220 [ 14.971427] RSP: 0018:ffffc9000033bc40 EFLAGS: 00010213 [ 14.974065] RAX: 0000000000000000 RBX: 0000000000002000 RCX: 0000000000000000 [ 14.979281] RDX: ffff88001f558000 RSI: 00000000000000ee RDI: ffffffff81ca30c8 [ 14.983863] RBP: ffffc9000033bc78 R08: 0000000000000494 R09: ffffffffffffff58 [ 14.987490] R10: ffff88000f4e0600 R11: ffffc9000033bad8 R12: 0000000000000500 [ 14.993031] R13: ffffffffa0064438 R14: 0000000000000494 R15: ffffffffffffff58 [ 14.997101] FS: 0000000000000000(0000) GS:ffff880011a00000(0063) knlGS:00000000f77cb144 [ 15.003469] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 15.009046] CR2: 00000000f7730000 CR3: 000000001f4b8000 CR4: 00000000000006f0 [ 15.011146] Call Trace: [ 15.013506] proto_register+0x4e/0x240 [ 15.015890] sctp_init+0x36b/0x4aa [sctp] [ 15.019611] ? 0xffffffffa0074000 [ 15.025333] do_one_initcall+0x43/0x170 [ 15.026622] ? __might_sleep+0x4a/0x80 [ 15.027951] ? kmem_cache_alloc_trace+0x163/0x1b0 [ 15.030445] do_init_module+0x5f/0x1f8 [ 15.035205] load_module+0x1562/0x1c30 [ 15.038455] SYSC_init_module+0x16f/0x180 [ 15.039994] ? SYSC_init_module+0x16f/0x180 [ 15.041489] SyS_init_module+0xe/0x10 [ 15.045990] do_fast_syscall_32+0xa9/0x220 [ 15.049584] entry_SYSENTER_compat+0x4c/0x5b [ 15.051017] RIP: 0023:0xf7734dd9 [ 15.055844] RSP: 002b:00000000ffd689dc EFLAGS: 00000282 ORIG_RAX: 0000000000000080 [ 15.060336] RAX: ffffffffffffffda RBX: 00000000f76b7010 RCX: 0000000000079330 [ 15.066726] RDX: 00000000080c1d40 RSI: 00000000080c1c70 RDI: 00000000080c1d50 [ 15.072076] RBP: 00000000080c1d50 R08: 0000000000000000 R09: 0000000000000000 [ 15.107800] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 15.109993] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 15.120904] Code: 45 d0 e8 c4 0a 7f 00 e8 8f 58 05 00 e8 da 3a 04 00 e8 05 8c eb ff 48 8b 45 d0 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 0b <0f> 0b 48 8b 5d c8 41 bc f4 ff ff ff e9 4c ff ff ff 48 c7 c7 58 [ 15.126352] RIP: kmem_cache_create_usercopy+0x200/0x220 RSP: ffffc9000033bc40 [ 15.128600] ---[ end trace 267192163249e4c2 ]--- To reproduce: git clone https://github.com/01org/lkp-tests.git cd lkp-tests bin/lkp qemu -k job-script # job-script is attached in this email Thanks, Kernel Test Robot