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Message-ID: <001a1148cc3acf967c0560c7b760@google.com> Date: Wed, 20 Dec 2017 08:03:02 -0800 From: syzbot <bot+1ab0ab6049e3e38c56d313bd2982bbf6b007ad6c@...kaller.appspotmail.com> To: hpa@...or.com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, mingo@...hat.com, pbonzini@...hat.com, rkrcmar@...hat.com, syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org Subject: KASAN: use-after-free Read in __schedule Hello, syzkaller hit the following crash on 7dc9f647127d6955ffacaf51cb6a627b31dceec2 git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master compiler: gcc (GCC) 7.1.1 20170620 .config is attached Raw console output is attached. C reproducer is attached syzkaller reproducer is attached. See https://goo.gl/kgGztJ for information about syzkaller reproducers kvm: KVM_SET_TSS_ADDR need to be called before entering vcpu ================================================================== BUG: KASAN: use-after-free in __fire_sched_out_preempt_notifiers kernel/sched/core.c:2550 [inline] BUG: KASAN: use-after-free in fire_sched_out_preempt_notifiers kernel/sched/core.c:2558 [inline] BUG: KASAN: use-after-free in prepare_task_switch kernel/sched/core.c:2594 [inline] BUG: KASAN: use-after-free in context_switch kernel/sched/core.c:2765 [inline] BUG: KASAN: use-after-free in __schedule+0xda3/0x2060 kernel/sched/core.c:3376 Read of size 8 at addr ffff8801c8cb8058 by task syzkaller738410/3153 CPU: 1 PID: 3153 Comm: syzkaller738410 Not tainted 4.15.0-rc4-next-20171220+ #77 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x25b/0x340 mm/kasan/report.c:409 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430 __fire_sched_out_preempt_notifiers kernel/sched/core.c:2550 [inline] fire_sched_out_preempt_notifiers kernel/sched/core.c:2558 [inline] prepare_task_switch kernel/sched/core.c:2594 [inline] context_switch kernel/sched/core.c:2765 [inline] __schedule+0xda3/0x2060 kernel/sched/core.c:3376 preempt_schedule_common+0x22/0x60 kernel/sched/core.c:3515 _cond_resched+0x1d/0x30 kernel/sched/core.c:4852 __wait_for_common kernel/sched/completion.c:107 [inline] wait_for_common kernel/sched/completion.c:123 [inline] wait_for_completion+0xa5/0x770 kernel/sched/completion.c:144 __synchronize_srcu+0x1ad/0x260 kernel/rcu/srcutree.c:925 synchronize_srcu_expedited kernel/rcu/srcutree.c:950 [inline] synchronize_srcu+0x1a3/0x570 kernel/rcu/srcutree.c:1001 kvm_page_track_unregister_notifier+0x186/0x270 arch/x86/kvm/page_track.c:213 kvm_mmu_uninit_vm+0x1c/0x20 arch/x86/kvm/mmu.c:5053 kvm_arch_destroy_vm+0x73b/0x980 arch/x86/kvm/x86.c:8418 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:728 [inline] kvm_put_kvm+0x695/0xde0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:749 kvm_vm_release+0x42/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:760 __fput+0x327/0x7e0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x199/0x270 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9bb/0x1ad0 kernel/exit.c:869 do_group_exit+0x149/0x400 kernel/exit.c:972 SYSC_exit_group kernel/exit.c:983 [inline] SyS_exit_group+0x1d/0x20 kernel/exit.c:981 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x43ee18 RSP: 002b:00007ffcbff2d938 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 000000000043ee18 RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 RBP: 00000000006ca018 R08: 00000000000000e7 R09: ffffffffffffffd0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b40 R13: 0000000000401bd0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 3153: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3545 kmem_cache_zalloc include/linux/slab.h:695 [inline] vmx_create_vcpu+0xc4/0x2f20 arch/x86/kvm/vmx.c:9819 kvm_arch_vcpu_create+0x12c/0x1a0 arch/x86/kvm/x86.c:7884 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:2445 [inline] kvm_vm_ioctl+0x48b/0x1c60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2943 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 entry_SYSCALL_64_fastpath+0x1f/0x96 Freed by task 3153: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3489 [inline] kmem_cache_free+0x83/0x2a0 mm/slab.c:3747 vmx_free_vcpu+0x1ee/0x260 arch/x86/kvm/vmx.c:9813 kvm_arch_vcpu_free arch/x86/kvm/x86.c:7870 [inline] kvm_free_vcpus arch/x86/kvm/x86.c:8317 [inline] kvm_arch_destroy_vm+0x4a2/0x980 arch/x86/kvm/x86.c:8416 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:728 [inline] kvm_put_kvm+0x695/0xde0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:749 kvm_vm_release+0x42/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:760 __fput+0x327/0x7e0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x199/0x270 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9bb/0x1ad0 kernel/exit.c:869 do_group_exit+0x149/0x400 kernel/exit.c:972 SYSC_exit_group kernel/exit.c:983 [inline] SyS_exit_group+0x1d/0x20 kernel/exit.c:981 entry_SYSCALL_64_fastpath+0x1f/0x96 The buggy address belongs to the object at ffff8801c8cb8040 which belongs to the cache kvm_vcpu of size 23872 The buggy address is located 24 bytes inside of 23872-byte region [ffff8801c8cb8040, ffff8801c8cbdd80) The buggy address belongs to the page: page:00000000cd7a3442 count:1 mapcount:0 mapping:00000000f1888586 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801c8cb8040 0000000000000000 0000000100000001 raw: ffff8801d6426748 ffff8801d6426748 ffff8801d6430c00 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c8cb7f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801c8cb7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8801c8cb8000: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8801c8cb8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c8cb8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This bug is generated by a dumb bot. It may contain errors. See https://goo.gl/tpsmEJ for details. Direct all questions to syzkaller@...glegroups.com. Please credit me with: Reported-by: syzbot <syzkaller@...glegroups.com> syzbot will keep track of this bug report. Once a fix for this bug is merged into any tree, reply to this email with: #syz fix: exact-commit-title If you want to test a patch for this bug, please reply with: #syz test: git://repo/address.git branch and provide the patch inline or as an attachment. To mark this as a duplicate of another syzbot report, please reply with: #syz dup: exact-subject-of-another-report If it's a one-off invalid bug report, please reply with: #syz invalid Note: if the crash happens again, it will cause creation of a new bug report. Note: all commands must start from beginning of the line in the email body. 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