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+0x1c4/0x2b4 lib/dump_stack.c:113 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.4+0xa/0x17 lib/fault-inject.c:149 ================================================================== BUG: KASAN: use-after-free in __fire_sched_in_preempt_notifiers kernel/sched/core.c:2481 [inline] BUG: KASAN: use-after-free in fire_sched_in_preempt_notifiers kernel/sched/core.c:2487 [inline] BUG: KASAN: use-after-free in finish_task_switch+0x5a5/0x900 kernel/sched/core.c:2679 Read of size 8 at addr ffff8801964e0558 by task syz-executor2/9713 __should_failslab+0x124/0x180 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:423 [inline] slab_alloc mm/slab.c:3378 [inline] kmem_cache_alloc_trace+0x2d7/0x750 mm/slab.c:3618 kmalloc include/linux/slab.h:513 [inline] kzalloc include/linux/slab.h:707 [inline] kvm_irqfd_assign arch/x86/kvm/../../../virt/kvm/eventfd.c:300 [inline] kvm_irqfd+0x198/0x1e70 arch/x86/kvm/../../../virt/kvm/eventfd.c:577 kvm_vm_ioctl+0xf76/0x1d40 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3025 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457679 Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f3bad4abc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f3bad4ac6d4 RCX: 0000000000457679 RDX: 0000000020000040 RSI: 000000004020ae76 RDI: 0000000000000004 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006 R13: 00000000004cff88 R14: 00000000004c009e R15: 0000000000000000 CPU: 1 PID: 9713 Comm: syz-executor2 Not tainted 4.19.0-rc4+ #248 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+0x1c4/0x2b4 lib/dump_stack.c:113 ------------[ cut here ]------------ kernel BUG at arch/x86/mm/physaddr.c:27! invalid opcode: 0000 [#1] PREEMPT SMP KASAN print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 CPU: 0 PID: 9723 Comm: syz-executor2 Not tainted 4.19.0-rc4+ #248 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__phys_addr+0xb5/0x120 arch/x86/mm/physaddr.c:27 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 Code: 08 4c 89 e3 31 ff 48 d3 eb 48 89 de e8 34 68 46 00 48 85 db 75 0f e8 fa 66 46 00 4c 89 e0 5b 41 5c 41 5d 5d c3 e8 eb 66 46 00 <0f> 0b e8 e4 66 46 00 48 c7 c7 10 10 47 89 48 b8 00 00 00 00 00 fc __fire_sched_in_preempt_notifiers kernel/sched/core.c:2481 [inline] fire_sched_in_preempt_notifiers kernel/sched/core.c:2487 [inline] finish_task_switch+0x5a5/0x900 kernel/sched/core.c:2679 RSP: 0018:ffff880194916d38 EFLAGS: 00010216 RAX: 0000000000040000 RBX: 0000000080000000 RCX: ffffc90003061000 RDX: 000000000001422e RSI: ffffffff81386d95 RDI: 0000000000000006 RBP: ffff880194916d50 R08: ffff8801d920a1c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000780000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff880197a2d000 FS: 00007fcc218b9700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe11da3b98 CR3: 00000001c7c42000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: vmcs_load+0x75/0x150 arch/x86/kvm/vmx.c:2135 context_switch kernel/sched/core.c:2828 [inline] __schedule+0x874/0x1ed0 kernel/sched/core.c:3473 vmx_vcpu_load+0x496/0x1030 arch/x86/kvm/vmx.c:3081 schedule+0xfe/0x460 kernel/sched/core.c:3517 kvm_arch_vcpu_load+0x247/0x970 arch/x86/kvm/x86.c:3106 kvm_sched_in+0x82/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3975 __fire_sched_in_preempt_notifiers kernel/sched/core.c:2481 [inline] fire_sched_in_preempt_notifiers kernel/sched/core.c:2487 [inline] finish_task_switch+0x56e/0x900 kernel/sched/core.c:2679 freezable_schedule include/linux/freezer.h:172 [inline] futex_wait_queue_me+0x3f9/0x840 kernel/futex.c:2530 futex_wait+0x45c/0xa50 kernel/futex.c:2645 context_switch kernel/sched/core.c:2828 [inline] __schedule+0x874/0x1ed0 kernel/sched/core.c:3473 do_futex+0x31a/0x26d0 kernel/futex.c:3528 schedule+0xfe/0x460 kernel/sched/core.c:3517 freezable_schedule include/linux/freezer.h:172 [inline] futex_wait_queue_me+0x3f9/0x840 kernel/futex.c:2530 futex_wait+0x45c/0xa50 kernel/futex.c:2645 do_futex+0x31a/0x26d0 kernel/futex.c:3528 __do_sys_futex kernel/futex.c:3589 [inline] __se_sys_futex kernel/futex.c:3557 [inline] __x64_sys_futex+0x472/0x6a0 kernel/futex.c:3557 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457679 Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fcc218d9cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 000000000072bf08 RCX: 0000000000457679 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072bf08 __do_sys_futex kernel/futex.c:3589 [inline] __se_sys_futex kernel/futex.c:3557 [inline] __x64_sys_futex+0x472/0x6a0 kernel/futex.c:3557 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000072bf0c R13: 00007ffc9c51b74f R14: 00007fcc218da9c0 R15: 0000000000000000 Allocated by task 9713: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x730 mm/slab.c:3554 kmem_cache_zalloc include/linux/slab.h:697 [inline] vmx_create_vcpu+0xcf/0x25e0 arch/x86/kvm/vmx.c:10954 kvm_arch_vcpu_create+0xe5/0x220 arch/x86/kvm/x86.c:8452 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:2476 [inline] kvm_vm_ioctl+0x470/0x1d40 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2977 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457679 Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 Freed by task 9712: RSP: 002b:00007fcc218b8cf8 EFLAGS: 00000246 save_stack+0x43/0xd0 mm/kasan/kasan.c:448 ORIG_RAX: 00000000000000ca set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 RAX: ffffffffffffffda RBX: 000000000072bfa8 RCX: 0000000000457679 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072bfa8 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x83/0x290 mm/slab.c:3756 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 vmx_free_vcpu+0x26b/0x300 arch/x86/kvm/vmx.c:10948 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000072bfac kvm_arch_vcpu_free arch/x86/kvm/x86.c:8438 [inline] kvm_free_vcpus arch/x86/kvm/x86.c:8888 [inline] kvm_arch_destroy_vm+0x365/0x7c0 arch/x86/kvm/x86.c:8985 R13: 00007ffc9c51b74f R14: 00007fcc218b99c0 R15: 0000000000000001 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:752 [inline] kvm_put_kvm+0x6c8/0xff0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:773 Modules linked in: kvm_vcpu_release+0x7b/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2407 __fput+0x385/0xa30 fs/file_table.c:278 ---[ end trace 3ca459fdb8a2e1e9 ]--- ____fput+0x15/0x20 fs/file_table.c:309 RIP: 0010:__phys_addr+0xb5/0x120 arch/x86/mm/physaddr.c:27 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Code: 08 4c 89 e3 31 ff 48 d3 eb 48 89 de e8 34 68 46 00 48 85 db 75 0f e8 fa 66 46 00 4c 89 e0 5b 41 5c 41 5d 5d c3 e8 eb 66 46 00 <0f> 0b e8 e4 66 46 00 48 c7 c7 10 10 47 89 48 b8 00 00 00 00 00 fc The buggy address belongs to the object at ffff8801964e0540 which belongs to the cache kvm_vcpu(81:syz2) of size 23872 The buggy address is located 24 bytes inside of 23872-byte region [ffff8801964e0540, ffff8801964e6280) The buggy address belongs to the page: page:ffffea0006593800 count:1 mapcount:0 mapping:ffff8801b9dcf180 index:0x0 compound_mapcount: 0 RSP: 0018:ffff880194916d38 EFLAGS: 00010216 flags: 0x2fffc0000008100(slab|head) RAX: 0000000000040000 RBX: 0000000080000000 RCX: ffffc90003061000 raw: 02fffc0000008100 ffffea00064c6608 ffff8801ca030148 ffff8801b9dcf180 RDX: 000000000001422e RSI: ffffffff81386d95 RDI: 0000000000000006 raw: 0000000000000000 ffff8801964e0540 0000000100000001 ffff8801b7630180 page dumped because: kasan: bad access detected page->mem_cgroup:ffff8801b7630180 Memory state around the buggy address: ffff8801964e0400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801964e0480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801964e0500: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8801964e0580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb RBP: ffff880194916d50 R08: ffff8801d920a1c0 R09: 0000000000000000 ffff8801964e0600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================