BUG: Bad page map in process syz-executor0  pte:af737007 pmd:124eef067
page:ffffea00041cb4a0 count:0 mapcount:-1 mapping:0000000000000000 index:0x0
flags: 0x100000000000000()
raw: 0100000000000000 ffffea00041cb4a8 ffffea00041cb4a8 0000000000000000
raw: 0000000000000000 0000000000000000 00000000fffffffe 0000000000000000
raw: 0000000000000000 0000000000000000 0000000000000001 0000000000000000
page dumped because: bad pte
addr:00000000946a47dd vm_flags:100400fb anon_vma:          (null) mapping:000000007c8f40a8 index:1bd
file:kcov fault:          (null) mmap:kcov_mmap readpage:          (null)
CPU: 1 PID: 7556 Comm: syz-executor0 Not tainted 4.18.0-rc8+ #34
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+0x17c/0x1c0 lib/dump_stack.c:113
 print_bad_pte+0xcae/0xde0 mm/memory.c:775
 zap_pte_range mm/memory.c:1336 [inline]
 zap_pmd_range mm/memory.c:1436 [inline]
 zap_pud_range mm/memory.c:1465 [inline]
 zap_p4d_range mm/memory.c:1486 [inline]
 unmap_page_range+0x2119/0x3b60 mm/memory.c:1507
 unmap_single_vma+0x445/0x5e0 mm/memory.c:1552
 unmap_vmas+0x241/0x370 mm/memory.c:1582
 exit_mmap+0x4d7/0x960 mm/mmap.c:3094
 __mmput+0x154/0x5f0 kernel/fork.c:994
 mmput+0xa7/0xe0 kernel/fork.c:1015
 exit_mm+0x6dd/0x790 kernel/exit.c:545
 do_exit+0xbf7/0x3890 kernel/exit.c:854
 do_group_exit+0x1a0/0x350 kernel/exit.c:970
 get_signal+0x1425/0x1ef0 kernel/signal.c:2468
 do_signal+0x120/0x2090 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline]
 prepare_exit_to_usermode+0x273/0x410 arch/x86/entry/common.c:197
 syscall_return_slowpath+0xdb/0x700 arch/x86/entry/common.c:268
 do_syscall_64+0x1ab/0x220 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457089
Code: fd 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007fc7bb41fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: 0000000000000004 RBX: 00007fc7bb4206d4 RCX: 0000000000457089
RDX: 0000000000000002 RSI: 0000000000000002 RDI: 000000000000001d
RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d5d20 R14: 00000000004c9632 R15: 0000000000000001
IPVS: set_ctl: invalid protocol: 1 255.255.255.255:20004
IPVS: set_ctl: invalid protocol: 1 255.255.255.255:20004
input:  as /devices/virtual/input/input7
input:  as /devices/virtual/input/input8
hrtimer: interrupt took 115803 ns
nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based  firewall rule not found. Use the iptables CT target to attach helpers instead.
raw_sendmsg: syz-executor4 forgot to set AF_INET. Fix it!
netlink: 20 bytes leftover after parsing attributes in process `syz-executor0'.
netlink: 12 bytes leftover after parsing attributes in process `syz-executor2'.
netlink: 12 bytes leftover after parsing attributes in process `syz-executor2'.
IPv6: Can't replace route, no match found
IPv6: Can't replace route, no match found
sg_write: data in/out 1818846731/2 bytes for SCSI command 0x6c-- guessing data in;
   program syz-executor2 not setting count and/or reply_len properly
sg_write: data in/out 1852401163/4 bytes for SCSI command 0x0-- guessing data in;
   program syz-executor2 not setting count and/or reply_len properly
sg_write: data in/out 1818846731/2 bytes for SCSI command 0x6c-- guessing data in;
   program syz-executor2 not setting count and/or reply_len properly
sg_write: data in/out 1852401163/4 bytes for SCSI command 0x0-- guessing data in;
   program syz-executor2 not setting count and/or reply_len properly
netlink: 'syz-executor2': attribute type 4 has an invalid length.
syz_tun: Invalid MTU 458754 requested, hw max 65521
netlink: 'syz-executor2': attribute type 4 has an invalid length.
syz_tun: Invalid MTU 458754 requested, hw max 65521
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
xprt_adjust_timeout: rq_timeout = 0!
xprt_adjust_timeout: rq_timeout = 0!