On Thu, Jan 11, 2018 at 01:08:14AM +0300, Alexey Dobriyan wrote: > Sorry, if everyone posted this kvm boot fail. > Adding "nopti" makes everything boot. > > tip/master > > commit 392b9cd85deec6e7f3e0fd97aac9aef2006c640b (HEAD, tip/master, tip/auto-latest) > Merge: 6b34948099b2 07881166a892 > > Merge branch 'sched/core' > > debian 8.8 image > > KVM: > > qemu-system-x86_64 -smp cpus=2 -m 1024 ... -append 'root=/dev/sda1 ignore_loglevel console=ttyAMA0 console=ttyS0' > > [ 0.982804] Freeing unused kernel memory: 952K > [ 0.990333] x86/mm: Checked W+X mappings: passed, no W+X pages found. > [ 0.990980] x86/mm: Checking user space page tables > [ 0.998409] x86/mm: Checked W+X mappings: passed, no W+X pages found. > [ 1.003149] kernel tried to execute NX-protected page - exploit attempt? (uid: 0) > [ 1.003815] BUG: unable to handle kernel paging request at fffffe0000007000 > [ 1.004424] IP: 0xfffffe0000007000 > [ 1.004727] PGD 3ffd8067 P4D 3ffd8067 PUD 3ffd7067 PMD 3fe15067 PTE 800000003fc09063 > [ 1.005402] Oops: 0011 [#1] PREEMPT SMP PTI > [ 1.005775] CPU: 0 PID: 1 Comm: init Not tainted 4.15.0-rc7-00482-g392b9cd85dee #5 > [ 1.006432] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1.fc27 04/01/2014 > [ 1.007239] RIP: 0010:0xfffffe0000007000 > [ 1.007589] RSP: 0018:ffffc9000000bfd0 EFLAGS: 00010006 > [ 1.008046] RAX: 000000000000000c RBX: 000055781b7fa040 RCX: 00007f78208d00bc > [ 1.008815] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff81400000 > [ 1.009636] RBP: 000000000000000a R08: 000000000000037f R09: 0000000000000064 > [ 1.010509] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffbc3eef99 > [ 1.011225] R13: 0000000000000000 R14: 000055781b81cc03 R15: 0000000000001000 > [ 1.011938] FS: 0000000000000000(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000 > [ 1.012723] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 1.013285] CR2: fffffe0000007000 CR3: 000000003da04000 CR4: 00000000000006b0 > [ 1.013960] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 1.014636] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > [ 1.015339] Call Trace: > [ 1.015595] Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > [ 1.017500] RIP: 0xfffffe0000007000 RSP: ffffc9000000bfd0 > [ 1.018037] CR2: fffffe0000007000 Bisection points to f3433c1010c6af61c9897f0f0447f81b991feac1 is the first bad commit commit f3433c1010c6af61c9897f0f0447f81b991feac1 Author: David Woodhouse <dwmw@xxxxxxxxxxxx> Date: Tue Jan 9 14:43:11 2018 +0000 x86/retpoline/entry: Convert entry assembler indirect jumps RETPOLINE is enabled but build system is reporting that compiler doesn't support it (Gentoo 6.4.0 p1.1) Disabling CONFIG_RETPOLINE fixes boot. And build system reports that "system may be insecure" even if RETPOLINE is disabled.
