================================================================== BUG: KASAN: use-after-free in instrument_atomic_write include/linux/instrumented.h:86 [inline] BUG: KASAN: use-after-free in paging64_cmpxchg_gpte arch/x86/kvm/mmu/paging_tmpl.h:181 [inline] BUG: KASAN: use-after-free in paging64_update_accessed_dirty_bits+0x5eb/0xa60 arch/x86/kvm/mmu/paging_tmpl.h:287 Write of size 8 at addr ffff888010000000 by task syz-executor.2/8071 CPU: 0 PID: 8071 Comm: syz-executor.2 Not tainted 5.10.77-syzkaller-01258-g76698ea35fd3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x8d/0x3d0 mm/kasan/report.c:233 __kasan_report+0x142/0x220 mm/kasan/report.c:419 kasan_report+0x51/0x70 mm/kasan/report.c:436 check_region_inline mm/kasan/generic.c:135 [inline] kasan_check_range+0x2b6/0x2f0 mm/kasan/generic.c:186 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37 instrument_atomic_write include/linux/instrumented.h:86 [inline] paging64_cmpxchg_gpte arch/x86/kvm/mmu/paging_tmpl.h:181 [inline] paging64_update_accessed_dirty_bits+0x5eb/0xa60 arch/x86/kvm/mmu/paging_tmpl.h:287 paging64_walk_addr_generic+0xc76/0x1470 arch/x86/kvm/mmu/paging_tmpl.h:459 paging64_walk_addr arch/x86/kvm/mmu/paging_tmpl.h:516 [inline] paging64_gva_to_gpa+0xd8/0x1b0 arch/x86/kvm/mmu/paging_tmpl.h:971 kvm_mmu_gva_to_gpa_write arch/x86/kvm/x86.c:5956 [inline] emulator_cmpxchg_emulated+0x1b8/0x840 arch/x86/kvm/x86.c:6423 __load_segment_descriptor+0xe18/0x1560 arch/x86/kvm/emulate.c:1767 load_segment_descriptor arch/x86/kvm/emulate.c:1834 [inline] em_ltr+0xb9/0xe0 arch/x86/kvm/emulate.c:3803 x86_emulate_insn+0xa79/0x63e0 arch/x86/kvm/emulate.c:5636 x86_emulate_instruction+0x1087/0x2730 arch/x86/kvm/x86.c:7480 kvm_mmu_page_fault+0x45e/0x550 arch/x86/kvm/mmu/mmu.c:5108 handle_ept_violation+0x2e2/0x470 arch/x86/kvm/vmx/vmx.c:5361 vmx_handle_exit+0x3b9/0xd20 arch/x86/kvm/vmx/vmx.c:6070 vcpu_enter_guest+0x24b1/0x3a80 arch/x86/kvm/x86.c:9151 vcpu_run+0x332/0xc20 arch/x86/kvm/x86.c:9216 kvm_arch_vcpu_ioctl_run+0x4d7/0x9d0 arch/x86/kvm/x86.c:9433 kvm_vcpu_ioctl+0x799/0xd70 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3277 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0x115/0x190 fs/ioctl.c:739 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f9699a65ae9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f96977dc188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f9699b78f60 RCX: 00007f9699a65ae9 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000007 RBP: 00007f9699abff25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd71040dbf R14: 00007f96977dc300 R15: 0000000000022000 The buggy address belongs to the page: page:ffffea0000400000 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x10000 flags: 0x4000000000000000() raw: 4000000000000000 ffffea0000410008 ffffea00003f0008 0000000000000000 raw: 0000000000000000 000000000000000a 00000000ffffff7f 0000000000000000 page dumped because: kasan: bad access detected page_owner info is not present (never set?) Memory state around the buggy address: ffff88800fffff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88800fffff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888010000000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888010000080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888010000100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================