I've got another crash on my Arch Linux with linux-grsec-4.2.6.201512051918-1-x86_64 when starting VMs with qemu:
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[ 25.520431] PAX: size overflow detected in function em_ret_far arch/x86/kvm/emulate.c:2198 cicus.1345_63 max, count: 243, decl: __load_segment_descriptor; num: 2; context: fndecl;
[ 25.520517] CPU: 0 PID: 1212 Comm: qemu-system-x86 Not tainted 4.2.6.201512051918-1-grsec #1
[ 25.520519] Hardware name: Intel Corporation S5500HCV/S5500HCV, BIOS S5500.86B.01.00.0059.082320111421 08/23/2011
[ 25.520521] ffffffff89a04847 2d5adece4769f79e 0000000000000000 ffffffffc02c93f2
[ 25.520524] ffffc90006ff3a58 ffffffff895d24a8 00000000000000a7 ffffffffc02c9455
[ 25.520527] ffffc90006ff3a88 ffffffff891a6e24 ffff88064d9d1570 0000000000000000
[ 25.520530] Call Trace:
[ 25.520540] [<ffffffff895d24a8>] dump_stack+0x4c/0x7f
[ 25.520545] [<ffffffff891a6e24>] report_size_overflow+0x34/0x40
[ 25.520561] [<ffffffffc01f78c2>] em_ret_far+0xf2/0x1a0 [kvm]
[ 25.520570] [<ffffffffc01fd237>] ? kvm_irq_delivery_to_apic_fast+0x217/0x2c0 [kvm]
[ 25.520578] [<ffffffffc01f98ad>] x86_emulate_insn+0x2cd/0x1070 [kvm]
[ 25.520586] [<ffffffffc01f86e8>] ? x86_decode_insn+0x3d8/0x1250 [kvm]
[ 25.520595] [<ffffffffc01dd177>] x86_emulate_instruction+0x1a7/0x750 [kvm]
[ 25.520602] [<ffffffffc024e600>] vmx_handle_exit+0x200/0x1370 [kvm_intel]
[ 25.520605] [<ffffffffc02456e1>] ? vmx_set_rflags+0x41/0x50 [kvm_intel]
[ 25.520613] [<ffffffffc01d5f85>] ? __kvm_set_rflags+0x55/0x70 [kvm]
[ 25.520617] [<ffffffffc02488a4>] ? update_cr8_intercept+0x64/0x70 [kvm_intel]
[ 25.520620] [<ffffffffc0244970>] ? vmx_get_exit_info+0x40/0x40 [kvm_intel]
[ 25.520623] [<ffffffffc0244380>] ? vmx_invpcid_supported+0x30/0x30 [kvm_intel]
[ 25.520632] [<ffffffffc01e1bac>] kvm_arch_vcpu_ioctl_run+0x73c/0x1270 [kvm]
[ 25.520638] [<ffffffffc01cabed>] kvm_vcpu_ioctl+0x52d/0xe10 [kvm]
[ 25.520642] [<ffffffff891b5f52>] do_vfs_ioctl+0x5c2/0x8a0
[ 25.520646] [<ffffffff891c2749>] ? __fget+0x79/0xa0
[ 25.520648] [<ffffffff891b62ad>] SyS_ioctl+0x7d/0x90
[ 25.520653] [<ffffffff895d86b0>] entry_SYSCALL_64_fastpath+0x12/0x8a