https://bugzilla.kernel.org/show_bug.cgi?id=196717 Jeff Cook (jeff@xxxxxxxxxxx) changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jeff@xxxxxxxxxxx --- Comment #2 from Jeff Cook (jeff@xxxxxxxxxxx) --- I've seen this on 4.12 and now on 4.13-rc6. On 4.12, the system-wide impact is very significant and the guests and host slow down or stop responding all together. On 4.13-rc6, only one guest crashes and the rest of the system seems to continue to operate as expected. I initially get [68470.767034] ------------[ cut here ]------------ [68470.767064] WARNING: CPU: 30 PID: 239 at arch/x86/kvm/mmu.c:717 mmu_spte_clear_track_bits+0xf0/0x100 [kvm] [...] [68470.767237] CPU: 30 PID: 239 Comm: khugepaged Tainted: P O 4.13.0-rc6-g14ccee78fc82 #5 [68470.767246] Hardware name: Supermicro SYS-7038A-I/X10DAI, BIOS 2.0a 11/09/2016 [68470.767255] task: ffff88085b6bc9c0 task.stack: ffffc90006b80000 [68470.767267] RIP: 0010:mmu_spte_clear_track_bits+0xf0/0x100 [kvm] [68470.767271] RSP: 0018:ffffc90006b83bd8 EFLAGS: 00010246 [68470.767275] RAX: 0000000000000000 RBX: 0000000117f13f77 RCX: dead0000000000ff [68470.767279] RDX: 0000000000000000 RSI: ffff8802caff9140 RDI: ffffea00045fc4c0 [68470.767283] RBP: ffffc90006b83bf0 R08: 0000000000000001 R09: 0000000000000000 [68470.767287] R10: ffff8803ed9d0008 R11: ffff8803ed9d0000 R12: 0000000000117f13 [68470.767291] R13: ffff880401f10000 R14: ffffffffa07a91f0 R15: ffff8803ed9d0008 [68470.767296] FS: 0000000000000000(0000) GS:ffff88105d580000(0000) knlGS:0000000000000000 [68470.767302] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [68470.767306] CR2: 000000000d070004 CR3: 0000000001a09000 CR4: 00000000003426e0 [68470.767310] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [68470.767314] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [68470.767318] Call Trace: [68470.767332] drop_spte+0x1a/0xb0 [kvm] [68470.767342] kvm_zap_rmapp+0x3b/0x70 [kvm] [68470.767352] kvm_unmap_rmapp+0xe/0x20 [kvm] [68470.767361] kvm_handle_hva_range+0x139/0x1b0 [kvm] [68470.767373] kvm_unmap_hva_range+0x17/0x20 [kvm] [68470.767382] kvm_mmu_notifier_invalidate_range_start+0x52/0x90 [kvm] [68470.767389] __mmu_notifier_invalidate_range_start+0x55/0x80 [68470.767395] khugepaged+0x1eb7/0x1ee0 [68470.767403] ? wait_woken+0x80/0x80 [68470.767408] kthread+0x125/0x140 [68470.767413] ? khugepaged_scan_abort.part.6+0x60/0x60 [68470.767417] ? kthread_create_on_node+0x70/0x70 [68470.767423] ret_from_fork+0x25/0x30 [68470.767427] Code: 5f 04 00 48 85 c0 75 1c 4c 89 e7 e8 9b 2d fe ff 48 8b 05 d4 5f 04 00 48 85 c0 74 be 48 85 c3 0f 95 c3 eb bc 48 85 c3 74 e7 eb dd <0f> ff eb 9b 4c 89 e7 e8 74 2d fe ff eb a1 66 90 0f 1f 44 00 00 [68470.767463] ---[ end trace 249e3dbfe7765567 ]--- [68470.767478] ------------[ cut here ]------------ Followed by many messages like this: 68627.864783] BUG: Bad page state in process khugepaged pfn:126aa9 [68627.864795] page:ffffea00049aaa40 count:0 mapcount:0 mapping: (null) index:0x1 [68627.864802] flags: 0x17fff0000000014(referenced|dirty) [68627.864808] raw: 017fff0000000014 0000000000000000 0000000000000001 00000000ffffffff [68627.864814] raw: dead000000000100 dead000000000200 0000000000000000 0000000000000000 [68627.864819] page dumped because: PAGE_FLAGS_CHECK_AT_PREP flag set [68627.864823] bad because of flags: 0x14(referenced|dirty) Full dmesg on rc6 forthcoming. -- You are receiving this mail because: You are watching the assignee of the bug.
