IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
8021q: adding VLAN 0 to HW filter on device team0
==================================================================
BUG: KASAN: use-after-free in filemap_fault+0x2818/0x2a70 mm/filemap.c:2559
Read of size 8 at addr ffff8881d205fad0 by task syz-executor0/8328

CPU: 0 PID: 8328 Comm: syz-executor0 Not tainted 4.20.0-rc7-next-20181224 #188
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+0x1d3/0x2c6 lib/dump_stack.c:113
 print_address_description.cold.5+0x9/0x1ff mm/kasan/report.c:187
 kasan_report.cold.6+0x1b/0x39 mm/kasan/report.c:317
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
 filemap_fault+0x2818/0x2a70 mm/filemap.c:2559
 ext4_filemap_fault+0x82/0xad fs/ext4/inode.c:6326
 __do_fault+0x176/0x6f0 mm/memory.c:3013
 do_shared_fault mm/memory.c:3479 [inline]
 do_fault mm/memory.c:3554 [inline]
 handle_pte_fault mm/memory.c:3781 [inline]
 __handle_mm_fault+0x373b/0x55f0 mm/memory.c:3905
 handle_mm_fault+0x54f/0xc70 mm/memory.c:3942
 do_user_addr_fault arch/x86/mm/fault.c:1475 [inline]
 __do_page_fault+0x5f6/0xd70 arch/x86/mm/fault.c:1541
 do_page_fault+0xf2/0x7e0 arch/x86/mm/fault.c:1572
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1143
RIP: 0033:0x43ea69
Code: b7 0e 66 89 0f 48 83 c6 02 48 83 c7 02 0f 1f 40 00 f6 c2 04 74 0c 8b 0e 89 0f 48 83 c6 04 48 83 c7 04 f6 c2 08 74 0e 48 8b 0e <48> 89 0f 48 83 c6 08 48 83 c7 08 81 e2 f0 00 00 00 74 1f 0f 1f 40
RSP: 002b:00007ffe3feb4198 EFLAGS: 00010202
RAX: 0000000020008ff8 RBX: 0000000000000003 RCX: 0031656c69662f2e
RDX: 0000000000000008 RSI: 0000000000740238 RDI: 0000000020008ff8
RBP: 000000000073bf00 R08: 0000000000740218 R09: 0000000000000000
R10: 00007ffe3feb4250 R11: 0000000000000246 R12: 0000000000000006
R13: fffffffffffffffe R14: 000000000073bf0c R15: 000000000073bf0c

Allocated by task 8329:
 save_stack+0x43/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 kasan_kmalloc+0xcb/0xd0 mm/kasan/common.c:482
 kasan_slab_alloc+0x12/0x20 mm/kasan/common.c:397
 kmem_cache_alloc+0x130/0x730 mm/slab.c:3541
 vm_area_alloc+0x7a/0x1d0 kernel/fork.c:331
 mmap_region+0x9d7/0x1cd0 mm/mmap.c:1756
 do_mmap+0xa22/0x1230 mm/mmap.c:1559
 do_mmap_pgoff include/linux/mm.h:2421 [inline]
 vm_mmap_pgoff+0x213/0x2c0 mm/util.c:350
 ksys_mmap_pgoff+0x4da/0x660 mm/mmap.c:1609
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:99 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:90 [inline]
 __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:90
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 8329:
 save_stack+0x43/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:444
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:452
 __cache_free mm/slab.c:3485 [inline]
 kmem_cache_free+0x83/0x290 mm/slab.c:3747
 vm_area_free+0x1c/0x20 kernel/fork.c:350
 remove_vma+0x13a/0x180 mm/mmap.c:185
 remove_vma_list mm/mmap.c:2585 [inline]
 __do_munmap+0x729/0xf50 mm/mmap.c:2822
 do_munmap mm/mmap.c:2830 [inline]
 mmap_region+0x6a7/0x1cd0 mm/mmap.c:1729
 do_mmap+0xa22/0x1230 mm/mmap.c:1559
 do_mmap_pgoff include/linux/mm.h:2421 [inline]
 vm_mmap_pgoff+0x213/0x2c0 mm/util.c:350
 ksys_mmap_pgoff+0x4da/0x660 mm/mmap.c:1609
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:99 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:90 [inline]
 __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:90
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8881d205fa90
 which belongs to the cache vm_area_struct(17:syz0) of size 200
The buggy address is located 64 bytes inside of
 200-byte region [ffff8881d205fa90, ffff8881d205fb58)
The buggy address belongs to the page:
page:ffffea00074817c0 count:1 mapcount:0 mapping:ffff8881b810fd80 index:0x0
flags: 0x2fffc0000000200(slab)
raw: 02fffc0000000200 ffff8881d179c548 ffffea0007602248 ffff8881b810fd80
raw: 0000000000000000 ffff8881d205f040 000000010000000f ffff8881d1c8c4c0
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8881d1c8c4c0

Memory state around the buggy address:
 ffff8881d205f980: fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881d205fa00: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
>ffff8881d205fa80: fc fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff8881d205fb00: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
 ffff8881d205fb80: fc fc fc fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================