L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details. kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 1 PID: 7390 Comm: syz-executor.0 Not tainted 4.14.174-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a8546380 task.stack: ffff8880a8548000 RIP: 0010:kobject_uevent_env+0xa3/0xc50 lib/kobject_uevent.c:355 RSP: 0018:ffff8880a854fb40 EFLAGS: 00010206 RAX: 0000000000000018 RBX: 0000000000000002 RCX: 1ffff110150a8d7e RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000000000c0 RBP: ffff88809f897010 R08: 0000000000000001 R09: 0000000000000001 R10: ffff8880a8546c28 R11: ffff8880a8546380 R12: 00000000000000a0 R13: dffffc0000000000 R14: ffff88809f896f08 R15: 00000000000000a0 FS: 0000000001374940(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fef91248000 CR3: 00000000851a0000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: loop_clr_fd+0x49e/0xad0 drivers/block/loop.c:1069 ip_tables: iptables: counters copy to user failed while replacing table lo_ioctl+0x8a5/0x1c40 drivers/block/loop.c:1424 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x91d/0x17d0 block/ioctl.c:594 ip_tables: iptables: counters copy to user failed while replacing table block_ioctl+0xd9/0x120 fs/block_dev.c:1881 ip_tables: iptables: counters copy to user failed while replacing table vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c6b7 RSP: 002b:00007ffd5ac231c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045c6b7 RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000003 RBP: 0000000000000030 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd5ac23200 R14: 000000000001fabc R15: 00007ffd5ac23210 Code: 03 42 80 3c 28 00 0f 85 2e 0a 00 00 4d 8b 64 24 18 4d 85 e4 0f 84 1e 02 00 00 e8 19 b4 1f fb 49 8d 7c 24 20 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 fa 09 00 00 49 8b 6c 24 20 48 85 ed 74 b0 RIP: kobject_uevent_env+0xa3/0xc50 lib/kobject_uevent.c:355 RSP: ffff8880a854fb40 ---[ end trace 635039594bc500dc ]---