binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_ERROR: 29189 binder: 27241:27260 transaction failed 29189/-3, size 0-0 line 2973 binder: undelivered TRANSACTION_ERROR: 29189 ================================================================== BUG: KASAN: use-after-free in __fire_sched_in_preempt_notifiers kernel/sched/core.c:2486 [inline] BUG: KASAN: use-after-free in fire_sched_in_preempt_notifiers kernel/sched/core.c:2492 [inline] BUG: KASAN: use-after-free in finish_task_switch+0x78e/0x900 kernel/sched/core.c:2684 Read of size 8 at addr ffff880193838958 by task syz-executor0/27273 CPU: 0 PID: 27273 Comm: syz-executor0 Not tainted 4.19.0-rc4-next-20180921+ #77 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+0x1d3/0x2c4 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __fire_sched_in_preempt_notifiers kernel/sched/core.c:2486 [inline] fire_sched_in_preempt_notifiers kernel/sched/core.c:2492 [inline] finish_task_switch+0x78e/0x900 kernel/sched/core.c:2684 binder: release 27280:27281 transaction 210 in, still active binder: send failed reply for transaction 210 to 27280:27281 binder_alloc: binder_alloc_mmap_handler: 27280 20001000-20004000 already mapped failed -16 binder: BINDER_SET_CONTEXT_MGR already set context_switch kernel/sched/core.c:2833 [inline] __schedule+0x874/0x1ed0 kernel/sched/core.c:3479 binder: 27280:27281 ioctl 40046207 0 returned -16 binder_alloc: 27280: binder_alloc_buf, no vma preempt_schedule_common+0x1f/0xd0 kernel/sched/core.c:3603 preempt_schedule+0x4d/0x60 kernel/sched/core.c:3629 ___preempt_schedule+0x16/0x18 binder: 27280:27282 transaction failed 29189/-3, size 0-0 line 2973 vprintk_emit+0x371/0x930 kernel/printk/printk.c:1922 binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_ERROR: 29189 vprintk_default+0x28/0x30 kernel/printk/printk.c:1962 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 binder: undelivered TRANSACTION_ERROR: 29189 printk+0xa7/0xcf kernel/printk/printk.c:1995 __dynamic_pr_debug+0x149/0x1c0 lib/dynamic_debug.c:565 kobject_uevent_env+0xa2/0x1370 lib/kobject_uevent.c:467 kvm_uevent_notify_change.part.33+0x2f8/0x450 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3921 kvm_uevent_notify_change arch/x86/kvm/../../../virt/kvm/kvm_main.c:3880 [inline] kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:3218 [inline] kvm_dev_ioctl+0xc81/0x1ae0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3240 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:00007f857cf12c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f857cf136d4 RCX: 0000000000457679 RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000006 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cfc28 R14: 00000000004bfd60 R15: 0000000000000000 Allocated by task 27273: 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 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:731 [inline] vmx_create_vcpu+0xcf/0x25c0 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:2475 [inline] kvm_vm_ioctl+0x472/0x1d60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2976 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 Freed by task 27272: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x83/0x290 mm/slab.c:3756 vmx_free_vcpu+0x26b/0x300 arch/x86/kvm/vmx.c:10948 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 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:751 [inline] kvm_put_kvm+0x6c8/0xff0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:772 kvm_vcpu_release+0x7b/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2406 __fput+0x3bc/0xa70 fs/file_table.c:279 ____fput+0x15/0x20 fs/file_table.c:312 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 The buggy address belongs to the object at ffff880193838940 which belongs to the cache kvm_vcpu(49:syz0) of size 23872 The buggy address is located 24 bytes inside of 23872-byte region [ffff880193838940, ffff88019383e680) The buggy address belongs to the page: page:ffffea00064e0e00 count:1 mapcount:0 mapping:ffff8801d9590480 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000010200(slab|head) raw: 02fffc0000010200 ffffea0006400408 ffffea0006e55c08 ffff8801d9590480 raw: 0000000000000000 ffff880193838940 0000000100000001 ffff8801c8e5c000 page dumped because: kasan: bad access detected page->mem_cgroup:ffff8801c8e5c000 Memory state around the buggy address: ffff880193838800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff880193838880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff880193838900: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff880193838980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880193838a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================