From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4E718EB64DA for ; Mon, 19 Jun 2023 18:24:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232338AbjFSSYE (ORCPT ); Mon, 19 Jun 2023 14:24:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52310 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231918AbjFSSYD (ORCPT ); Mon, 19 Jun 2023 14:24:03 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 79748118 for ; Mon, 19 Jun 2023 11:24:01 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 088C560E71 for ; Mon, 19 Jun 2023 18:24:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B09CDC433C0; Mon, 19 Jun 2023 18:23:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1687199040; bh=9jgCU//TzQG76tc81FBItZl7MuyByncWmRwfkKLNzQA=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=JtVK8JfT2qpzZVubl4bv9vky2WQP6279B8Jd7csG7fimWkTaIhqBx6NH2lPtJ2dme n/yqLb3N95kUjyUdOwgAocPJ2Q5yBxzzm+AK8otToBRslhPvc48Jzw9/gcTDjtVo5e 4ShT9Nd/oa2cmXpOrSDZSUguiJluQ56HfhNLSzxEw/d86THV6XChrvijGFtlWjUcEU 43Ra9geIgrbqrEbpmnYgdFoKfHyh1mso8vDcC+kAmvIS2hmwgJpb8B/9rZ5EKF25K8 FhLlYurPNw6h6D2OmfyOHC3iN9yYK4a/gXdWcB9qrB9iUbZgDpJOFaKdzMsmiErGC5 3p7uGBt3dK2QQ== Message-ID: Subject: Re: BUG in raid6_pq while running fstest btrfs/286 From: Jeff Layton To: dsterba@suse.cz, Qu Wenruo Cc: Alexander Gordeev , Song Liu , Heiko Carstens , Giulio Benetti , linux-btrfs Date: Mon, 19 Jun 2023 14:23:58 -0400 In-Reply-To: <20230619175443.GE16168@twin.jikos.cz> References: <72097c8f447b02fb4ed3cb6b898d73423ca52d09.camel@kernel.org> <8b24dc83-1506-b5cc-1441-5233d161f5d8@suse.com> <20230619175443.GE16168@twin.jikos.cz> Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.48.3 (3.48.3-1.fc38) MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On Mon, 2023-06-19 at 19:54 +0200, David Sterba wrote: > On Fri, Jun 16, 2023 at 09:57:47AM +0800, Qu Wenruo wrote: > > On 2023/6/16 01:58, Jeff Layton wrote: > > > I hit this today, while doing some testing with kdevops. Test btrfs/2= 86 > > > was running when it failed: > > >=20 > > > [ 4759.230216] run fstests btrfs/286 at 2023-06-15 16:11:41 > > > [ 4759.636322] BTRFS: device fsid 8d197804-9964-4b3f-bbea-3ef33869b56= 4 devid 1 transid 484 /dev/loop16 scanned by mount (893879) > > > [ 4759.641190] BTRFS info (device loop16): using crc32c (crc32c-intel= ) checksum algorithm > > > [ 4759.644817] BTRFS info (device loop16): using free space tree > > > [ 4759.650706] BTRFS info (device loop16): enabling ssd optimizations > > > [ 4759.652720] BTRFS info (device loop16): auto enabling async discar= d > > > [ 4760.484561] BTRFS: device fsid 2a451aed-b7b6-4498-ba17-0e28a2e1a26= b devid 1 transid 6 /dev/loop5 scanned by (udev-worker) (894101) > > > [ 4760.494221] BTRFS: device fsid 2a451aed-b7b6-4498-ba17-0e28a2e1a26= b devid 2 transid 6 /dev/loop6 scanned by (udev-worker) (892207) > > > [ 4760.497373] BTRFS: device fsid 2a451aed-b7b6-4498-ba17-0e28a2e1a26= b devid 3 transid 6 /dev/loop7 scanned by (udev-worker) (892535) > > > [ 4760.502687] BTRFS: device fsid 2a451aed-b7b6-4498-ba17-0e28a2e1a26= b devid 4 transid 6 /dev/loop8 scanned by mkfs.btrfs (894095) > > > [ 4760.515672] BTRFS info (device loop5): using crc32c (crc32c-intel)= checksum algorithm > > > [ 4760.519412] BTRFS info (device loop5): setting nodatasum > > > [ 4760.521777] BTRFS info (device loop5): using free space tree > > > [ 4760.527120] BTRFS info (device loop5): enabling ssd optimizations > > > [ 4760.528861] BTRFS info (device loop5): auto enabling async discard > > > [ 4760.532184] BTRFS info (device loop5): checking UUID tree > > > [ 4762.658754] BTRFS info (device loop5): using crc32c (crc32c-intel)= checksum algorithm > > > [ 4762.662098] BTRFS info (device loop5): allowing degraded mounts > > > [ 4762.664749] BTRFS info (device loop5): setting nodatasum > > > [ 4762.667347] BTRFS info (device loop5): using free space tree > > > [ 4762.672306] BTRFS warning (device loop5): devid 2 uuid de8712ab-ca= 85-4414-93a7-213060d1831d is missing > > > [ 4762.676977] BTRFS info (device loop5): enabling ssd optimizations > > > [ 4762.679852] BTRFS info (device loop5): auto enabling async discard > > > [ 4763.355404] BTRFS info (device loop5): dev_replace from (devid 2) to /dev/loop9 started > > > [ 4763.595633] BTRFS info (device loop5): dev_replace from (devid 2) to /dev/loop9 finished > > > [ 4764.044660] 286 (893750): drop_caches: 3 > > > [ 4765.384814] BTRFS: device fsid 7acce38c-63c2-4365-a338-e1f6c0fd484= b devid 1 transid 6 /dev/loop5 scanned by (udev-worker) (894101) > > > [ 4765.392235] BTRFS: device fsid 7acce38c-63c2-4365-a338-e1f6c0fd484= b devid 2 transid 6 /dev/loop6 scanned by (udev-worker) (892207) > > > [ 4765.404469] BTRFS: device fsid 7acce38c-63c2-4365-a338-e1f6c0fd484= b devid 3 transid 6 /dev/loop7 scanned by (udev-worker) (894101) > > > [ 4765.412107] BTRFS: device fsid 7acce38c-63c2-4365-a338-e1f6c0fd484= b devid 4 transid 6 /dev/loop8 scanned by mkfs.btrfs (894169) > > > [ 4765.429084] BTRFS info (device loop5): using crc32c (crc32c-intel)= checksum algorithm > > > [ 4765.433332] BTRFS info (device loop5): setting nodatasum > > > [ 4765.435506] BTRFS info (device loop5): using free space tree > > > [ 4765.440808] BTRFS info (device loop5): enabling ssd optimizations > > > [ 4765.442402] BTRFS info (device loop5): auto enabling async discard > > > [ 4765.444752] BTRFS info (device loop5): checking UUID tree > > > [ 4767.634901] BTRFS info (device loop5): using crc32c (crc32c-intel)= checksum algorithm > > > [ 4767.637985] BTRFS info (device loop5): allowing degraded mounts > > > [ 4767.640216] BTRFS info (device loop5): setting nodatasum > > > [ 4767.642221] BTRFS info (device loop5): using free space tree > > > [ 4767.646646] BTRFS warning (device loop5): devid 2 uuid 6240c286-89= 3c-4d19-bbf5-f1d2fecc6b96 is missing > > > [ 4767.650311] BTRFS warning (device loop5): devid 2 uuid 6240c286-89= 3c-4d19-bbf5-f1d2fecc6b96 is missing > > > [ 4767.655256] BTRFS info (device loop5): enabling ssd optimizations > > > [ 4767.658073] BTRFS info (device loop5): auto enabling async discard > > > [ 4768.343633] BTRFS info (device loop5): dev_replace from (devid 2) to /dev/loop9 started > > > [ 4768.608799] BTRFS info (device loop5): dev_replace from (devid 2) to /dev/loop9 finished > > > [ 4768.750345] 286 (893750): drop_caches: 3 > > > [ 4769.993871] BTRFS: device fsid 965cdb50-095a-4fd9-bcda-2c17bd80c3a= d devid 1 transid 6 /dev/loop5 scanned by (udev-worker) (894101) > > > [ 4770.002879] BTRFS: device fsid 965cdb50-095a-4fd9-bcda-2c17bd80c3a= d devid 2 transid 6 /dev/loop6 scanned by (udev-worker) (892207) > > > [ 4770.015617] BTRFS: device fsid 965cdb50-095a-4fd9-bcda-2c17bd80c3a= d devid 3 transid 6 /dev/loop7 scanned by (udev-worker) (894101) > > > [ 4770.021936] BTRFS: device fsid 965cdb50-095a-4fd9-bcda-2c17bd80c3a= d devid 4 transid 6 /dev/loop8 scanned by mkfs.btrfs (894243) > > > [ 4770.041357] BTRFS info (device loop5): using crc32c (crc32c-intel)= checksum algorithm > > > [ 4770.043426] BTRFS info (device loop5): setting nodatasum > > > [ 4770.045340] BTRFS info (device loop5): using free space tree > > > [ 4770.050615] BTRFS info (device loop5): enabling ssd optimizations > > > [ 4770.053473] BTRFS info (device loop5): auto enabling async discard > > > [ 4770.056311] BTRFS info (device loop5): checking UUID tree > > > [ 4772.692223] BTRFS info (device loop5): using crc32c (crc32c-intel)= checksum algorithm > > > [ 4772.695043] BTRFS info (device loop5): allowing degraded mounts > > > [ 4772.697901] BTRFS info (device loop5): setting nodatasum > > > [ 4772.700355] BTRFS info (device loop5): using free space tree > > > [ 4772.704900] BTRFS warning (device loop5): devid 2 uuid 5fa35bdf-8f= 54-4652-ba28-7c302a265f8d is missing > > > [ 4772.708151] BTRFS warning (device loop5): devid 2 uuid 5fa35bdf-8f= 54-4652-ba28-7c302a265f8d is missing > > > [ 4772.713703] BTRFS info (device loop5): enabling ssd optimizations > > > [ 4772.716270] BTRFS info (device loop5): auto enabling async discard > > > [ 4773.735253] BTRFS info (device loop5): dev_replace from (devid 2) to /dev/loop9 started > > > [ 4774.089640] BTRFS info (device loop5): dev_replace from (devid 2) to /dev/loop9 finished > > > [ 4774.269606] 286 (893750): drop_caches: 3 > > > [ 4775.897236] BTRFS: device fsid 0552fbf6-2877-4ab3-b5a2-da5db268e1c= 3 devid 1 transid 6 /dev/loop5 scanned by (udev-worker) (894101) > > > [ 4775.905939] BTRFS: device fsid 0552fbf6-2877-4ab3-b5a2-da5db268e1c= 3 devid 2 transid 6 /dev/loop6 scanned by mkfs.btrfs (894317) > > > [ 4775.909603] BTRFS: device fsid 0552fbf6-2877-4ab3-b5a2-da5db268e1c= 3 devid 3 transid 6 /dev/loop7 scanned by mkfs.btrfs (894317) > > > [ 4775.913080] BTRFS: device fsid 0552fbf6-2877-4ab3-b5a2-da5db268e1c= 3 devid 4 transid 6 /dev/loop8 scanned by mkfs.btrfs (894317) > > > [ 4775.928177] BTRFS info (device loop5): using crc32c (crc32c-intel)= checksum algorithm > > > [ 4775.930566] BTRFS info (device loop5): setting nodatasum > > > [ 4775.932930] BTRFS info (device loop5): using free space tree > > > [ 4775.937296] BTRFS info (device loop5): enabling ssd optimizations > > > [ 4775.938306] BTRFS info (device loop5): auto enabling async discard > > > [ 4775.940084] BTRFS info (device loop5): checking UUID tree > > > [ 4779.204728] BTRFS info (device loop5): using crc32c (crc32c-intel)= checksum algorithm > > > [ 4779.207351] BTRFS info (device loop5): allowing degraded mounts > > > [ 4779.210284] BTRFS info (device loop5): setting nodatasum > > > [ 4779.212740] BTRFS info (device loop5): using free space tree > > > [ 4779.218547] BTRFS warning (device loop5): devid 2 uuid 9a9f7178-0c= aa-4c5f-8f92-034e72257005 is missing > > > [ 4779.221982] BTRFS warning (device loop5): devid 2 uuid 9a9f7178-0c= aa-4c5f-8f92-034e72257005 is missing > > > [ 4779.227912] BTRFS info (device loop5): enabling ssd optimizations > > > [ 4779.230483] BTRFS info (device loop5): auto enabling async discard > > > [ 4780.128223] BTRFS info (device loop5): dev_replace from (devid 2) to /dev/loop9 started > > > [ 4780.422390] BUG: kernel NULL pointer dereference, address: 0000000= 000000000 > > > [ 4780.423934] #PF: supervisor read access in kernel mode > > > [ 4780.425584] #PF: error_code(0x0000) - not-present page > > > [ 4780.427234] PGD 0 P4D 0 > > > [ 4780.428293] Oops: 0000 [#1] PREEMPT SMP PTI > > > [ 4780.429722] CPU: 3 PID: 761699 Comm: kworker/u16:4 Not tainted 6.4= .0-rc6+ #6 > > > [ 4780.431582] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BI= OS 1.16.2-1.fc38 04/01/2014 > > > [ 4780.433897] Workqueue: btrfs-rmw rmw_rbio_work [btrfs] > > > [ 4780.435655] RIP: 0010:raid6_sse21_gen_syndrome+0x9e/0x130 [raid6_p= q] > > > [ 4780.437518] Code: 4d 8d 54 05 00 44 89 c0 48 c1 e0 03 48 29 c6 49 = 8b 03 48 01 d0 0f 18 00 66 0f 6f 10 49 8b 01 0f 18 04 10 66 0f 6f e2 49 8b = 01 <66> 0f 6f 34 10 4c 89 d0 45 85 c0 78 34 48 8b 08 0f 18 04 11 66 0f > > > [ 4780.442488] RSP: 0018:ffffb66f0296fdc8 EFLAGS: 00010286 > > > [ 4780.444147] RAX: 0000000000000000 RBX: 0000000000001000 RCX: ffffa= 0ff4cfa3248 > > > [ 4780.446192] RDX: 0000000000000000 RSI: ffffa0f74cfa3238 RDI: 00000= 00000000000 > > > [ 4780.448278] RBP: ffffa0ff4e72a000 R08: 00000000fffffffe R09: ffffa= 0ff4cfa3238 > > > [ 4780.450387] R10: ffffa0ff4cfa3230 R11: ffffa0ff4cfa3240 R12: ffffa= 0fe8bdf3000 > > > [ 4780.452515] R13: ffffa0ff4cfa3240 R14: 0000000000000003 R15: 00000= 00000000000 > > > [ 4780.454638] FS: 0000000000000000(0000) GS:ffffa0ff77cc0000(0000) = knlGS:0000000000000000 > > > [ 4780.456956] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > > [ 4780.458778] CR2: 0000000000000000 CR3: 000000015eb0a001 CR4: 00000= 00000060ee0 > > > [ 4780.460789] Call Trace: > > > [ 4780.461832] > > > [ 4780.462804] ? __die+0x1f/0x70 > > > [ 4780.463915] ? page_fault_oops+0x159/0x450 > > > [ 4780.465207] ? fixup_exception+0x22/0x310 > > > [ 4780.466484] ? exc_page_fault+0x7a/0x180 > > > [ 4780.467666] ? asm_exc_page_fault+0x22/0x30 > > > [ 4780.468879] ? raid6_sse21_gen_syndrome+0x9e/0x130 [raid6_pq] > > > [ 4780.470372] ? raid6_sse21_gen_syndrome+0x38/0x130 [raid6_pq] > > > [ 4780.471801] rmw_rbio+0x5c8/0xa80 [btrfs] > > > [ 4780.472987] ? preempt_count_add+0x6a/0xa0 > > > [ 4780.474061] ? lock_stripe_add+0xe1/0x290 [btrfs] > > > [ 4780.475288] process_one_work+0x1c7/0x3d0 > > > [ 4780.476304] worker_thread+0x4d/0x380 > > > [ 4780.477232] ? __pfx_worker_thread+0x10/0x10 > > > [ 4780.478241] kthread+0xf3/0x120 > > > [ 4780.479071] ? __pfx_kthread+0x10/0x10 > > > [ 4780.479982] ret_from_fork+0x2c/0x50 > > > [ 4780.480843] > > > [ 4780.481488] Modules linked in: dm_thin_pool dm_persistent_data dm_= bio_prison dm_bufio dm_log_writes dm_flakey nls_iso8859_1 nls_cp437 vfat fa= t ext4 9p crc16 joydev kvm_intel netfs virtio_net mbcache cirrus kvm psmous= e pcspkr net_failover failover xfs irqbypass drm_shmem_helper virtio_balloo= n jbd2 evdev button 9pnet_virtio drm_kms_helper loop drm dm_mod zram zsmall= oc crct10dif_pclmul crc32_pclmul ghash_clmulni_intel sha512_ssse3 sha512_ge= neric aesni_intel nvme virtio_blk crypto_simd nvme_core virtio_pci cryptd t= 10_pi virtio i6300esb virtio_pci_legacy_dev crc64_rocksoft_generic virtio_p= ci_modern_dev crc64_rocksoft crc64 virtio_ring serio_raw btrfs blake2b_gene= ric libcrc32c crc32c_generic crc32c_intel xor raid6_pq autofs4 > > > [ 4780.492421] CR2: 0000000000000000 > > > [ 4780.493185] ---[ end trace 0000000000000000 ]--- > > > [ 4780.494099] RIP: 0010:raid6_sse21_gen_syndrome+0x9e/0x130 [raid6_p= q] > > > [ 4780.495217] Code: 4d 8d 54 05 00 44 89 c0 48 c1 e0 03 48 29 c6 49 = 8b 03 48 01 d0 0f 18 00 66 0f 6f 10 49 8b 01 0f 18 04 10 66 0f 6f e2 49 8b = 01 <66> 0f 6f 34 10 4c 89 d0 45 85 c0 78 34 48 8b 08 0f 18 04 11 66 0f > > > [ 4780.498186] RSP: 0018:ffffb66f0296fdc8 EFLAGS: 00010286 > > > [ 4780.499138] RAX: 0000000000000000 RBX: 0000000000001000 RCX: ffffa= 0ff4cfa3248 > > > [ 4780.500327] RDX: 0000000000000000 RSI: ffffa0f74cfa3238 RDI: 00000= 00000000000 > > > [ 4780.501533] RBP: ffffa0ff4e72a000 R08: 00000000fffffffe R09: ffffa= 0ff4cfa3238 > > > [ 4780.502683] R10: ffffa0ff4cfa3230 R11: ffffa0ff4cfa3240 R12: ffffa= 0fe8bdf3000 > > > [ 4780.503827] R13: ffffa0ff4cfa3240 R14: 0000000000000003 R15: 00000= 00000000000 > > > [ 4780.504971] FS: 0000000000000000(0000) GS:ffffa0ff77cc0000(0000) = knlGS:0000000000000000 > > > [ 4780.506207] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > > [ 4780.507143] CR2: 0000000000000000 CR3: 000000015eb0a001 CR4: 00000= 00000060ee0 > > > [ 4780.508242] note: kworker/u16:4[761699] exited with irqs disabled > > > [ 4780.509242] note: kworker/u16:4[761699] exited with preempt_count = 1 > > >=20 > > >=20 > > > Looks like a quadword move failed? I'm not well-versed in SSE asm, I'= m afraid: > > >=20 > > > $ ./scripts/faddr2line --list ./lib/raid6/raid6_pq.ko raid6_sse21_gen= _syndrome+0x9e/0x130 > > > raid6_sse21_gen_syndrome+0x9e/0x130: > > >=20 > > > raid6_sse21_gen_syndrome at /home/jlayton/git/kdevops/linux/lib/raid6= /sse2.c:56 > > > 51 for ( d =3D 0 ; d < bytes ; d +=3D 16 ) { > > > 52 asm volatile("prefetchnta %0" : : "m" (dptr[z0][d])); > > > 53 asm volatile("movdqa %0,%%xmm2" : : "m" (dptr[z0][d])); /* P[= 0] */ > > > 54 asm volatile("prefetchnta %0" : : "m" (dptr[z0-1][d])); > > > 55 asm volatile("movdqa %xmm2,%xmm4"); /* Q[0] */ > > > > 56< asm volatile("movdqa %0,%%xmm6" : : "m" (dptr[z0-1][d])); > > > 57 for ( z =3D z0-2 ; z >=3D 0 ; z-- ) { > > > 58 asm volatile("prefetchnta %0" : : "m" (dptr[z][d])); > > > 59 asm volatile("pcmpgtb %xmm4,%xmm5"); > > > 60 asm volatile("paddb %xmm4,%xmm4"); > > > 61 asm volatile("pand %xmm0,%xmm5"); > > >=20 > > >=20 > > > This machine is running v6.4.0-rc5 with some ctime handling patches o= n > > > top (nothing that should affect anything at this level). The Kconfig = is > > > config-next-20230530 from the kdevops tree: > > >=20 > > > https://github.com/linux-kdevops/kdevops/blob/master/playbooks/roles/= bootlinux/templates/config-next-20230530) > > >=20 > > > Let me know if you need other info! > >=20 > > Unfortunately there are similar reports but I failed to reproduce anywh= ere. > >=20 > > In the past, I have added extra debugging for the reporter, and the=20 > > result is, at least every pointer is valid, until the control is passed= =20 > > to the optimization routine... > >=20 > > You can try to disable SSE for the vCPU, or even pass AVX feature to th= e=20 > > vCPU, and normally you would see the error gone. > >=20 > > The last time I see such problem is from David, but we did not got any= =20 > > progress any further. >=20 > I haven't seen the crash for a long time, IIRC it's related to SSE2, > no acceleration or anything AVX+ works. That sounds plausible. This is a pretty old CPU: processor : 3 vendor_id : GenuineIntel cpu family : 6 model : 42 model name : Intel(R) Core(TM) i5-2400 CPU @ 3.10GHz stepping : 7 microcode : 0x2f cpu MHz : 1600.000 cache size : 6144 KB physical id : 0 siblings : 4 core id : 3 cpu cores : 4 apicid : 6 initial apicid : 6 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat = pse36 clflush dts acpi mmx fxsr sse sse2 ht tm pbe syscall nx rdtscp lm con= stant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid a= perfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xt= pr pdcm pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx l= ahf_lm epb pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid x= saveopt dtherm ida arat pln pts md_clear flush_l1d vmx flags : vnmi preemption_timer invvpid ept_x_only flexpriority tsc_offse= t vtpr mtf vapic ept vpid unrestricted_guest bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapg= s itlb_multihit mmio_unknown bogomips : 6186.18 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: --=20 Jeff Layton