BUG: KASAN: use-after-free in arch_local_irq_enable arch/x86/include/asm/paravirt.h:787 [inline]
BUG: KASAN: use-after-free in __do_page_fault+0xc03/0xd60 arch/x86/mm/fault.c:1357
Read of size 8 at addr ffff8801cbba6680 by task syz-executor0/3851

CPU: 0 PID: 3851 Comm: syz-executor0 Not tainted 4.14.0-rc3+ #27
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 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
 arch_local_irq_enable arch/x86/include/asm/paravirt.h:787 [inline]
 __do_page_fault+0xc03/0xd60 arch/x86/mm/fault.c:1357
 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1520
 page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1066
RIP: 0023:0x8073f4f
RSP: 002b:00000000f7f02bd0 EFLAGS: 00010202
RAX: 00000000f7f02c8c RBX: 0000000000000400 RCX: 000000000000000e
RDX: 00000000f7f03a88 RSI: 0000000020012fe0 RDI: 00000000f7f02c8c
RBP: 0000000008128000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 3851:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 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:3561
 kmem_cache_zalloc include/linux/slab.h:656 [inline]
 mmap_region+0x7ee/0x15a0 mm/mmap.c:1658
 do_mmap+0x6a1/0xd50 mm/mmap.c:1468
 do_mmap_pgoff include/linux/mm.h:2150 [inline]
 vm_mmap_pgoff+0x1de/0x280 mm/util.c:333
 SYSC_mmap_pgoff mm/mmap.c:1518 [inline]
 SyS_mmap_pgoff+0x23b/0x5f0 mm/mmap.c:1476
 do_syscall_32_irqs_on arch/x86/entry/common.c:329 [inline]
 do_fast_syscall_32+0x3f2/0xf05 arch/x86/entry/common.c:391
 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:124

Freed by task 3856:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 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:3503 [inline]
 kmem_cache_free+0x77/0x280 mm/slab.c:3763
 remove_vma+0x162/0x1b0 mm/mmap.c:176
 remove_vma_list mm/mmap.c:2475 [inline]
 do_munmap+0x82a/0xdf0 mm/mmap.c:2714
 mmap_region+0x59e/0x15a0 mm/mmap.c:1631
 do_mmap+0x6a1/0xd50 mm/mmap.c:1468
 do_mmap_pgoff include/linux/mm.h:2150 [inline]
 vm_mmap_pgoff+0x1de/0x280 mm/util.c:333
 SYSC_mmap_pgoff mm/mmap.c:1518 [inline]
 SyS_mmap_pgoff+0x23b/0x5f0 mm/mmap.c:1476
 do_syscall_32_irqs_on arch/x86/entry/common.c:329 [inline]
 do_fast_syscall_32+0x3f2/0xf05 arch/x86/entry/common.c:391
 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:124

The buggy address belongs to the object at ffff8801cbba6630
 which belongs to the cache vm_area_struct of size 200
The buggy address is located 80 bytes inside of
 200-byte region [ffff8801cbba6630, ffff8801cbba66f8)
The buggy address belongs to the page:
page:ffffea00072ee980 count:1 mapcount:0 mapping:ffff8801cbba6000 index:0x0
flags: 0x200000000000100(slab)
raw: 0200000000000100 ffff8801cbba6000 0000000000000000 000000010000000f
raw: ffffea00072ec860 ffffea00072e72a0 ffff8801dae069c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801cbba6580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
 ffff8801cbba6600: fc fc fc fc fc fc fb fb fb fb fb fb fb fb fb fb
>ffff8801cbba6680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc
                   ^
 ffff8801cbba6700: fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00
 ffff8801cbba6780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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