syz-executor4 (7927) used greatest stack depth: 50760 bytes left
BUG: Bad page map in process syz-fuzzer  pte:bd445067 pmd:1a5c3f067
page:ffffea00046f99e0 count:1 mapcount:-1 mapping:0000000000000000 index:0x0
flags: 0x100000000000814(referenced|dirty|reserved)
raw: 0100000000000814 ffffea00046f99e8 ffffea00046f99e8 0000000000000000
raw: 0000000000000000 0000000000000000 00000001fffffffe 0000000000000000
raw: ffffea000b314d40 ffffea000b314da0 0000000000000001 0000000000000000
page dumped because: bad pte
addr:00000000ca217785 vm_flags:00100073 anon_vma:000000004e8f5129 mapping:          (null) index:c4311f2
file:          (null) fault:          (null) mmap:          (null) readpage:          (null)
CPU: 1 PID: 4773 Comm: syz-fuzzer Not tainted 4.19.0-rc1+ #40
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+0x14b/0x190 lib/dump_stack.c:113
 print_bad_pte+0xc47/0xd40 mm/memory.c:774
 zap_pte_range mm/memory.c:1341 [inline]
 zap_pmd_range mm/memory.c:1441 [inline]
 zap_pud_range mm/memory.c:1470 [inline]
 zap_p4d_range mm/memory.c:1491 [inline]
 unmap_page_range+0x1ee7/0x4170 mm/memory.c:1512
 unmap_single_vma+0x445/0x5e0 mm/memory.c:1557
 unmap_vmas+0x251/0x380 mm/memory.c:1587
 exit_mmap+0x4b7/0x940 mm/mmap.c:3093
 __mmput+0x154/0x5f0 kernel/fork.c:1003
 mmput+0xa7/0xe0 kernel/fork.c:1024
 exit_mm+0x6dd/0x790 kernel/exit.c:546
 do_exit+0xbf7/0x3890 kernel/exit.c:856
 do_group_exit+0x1a0/0x350 kernel/exit.c:972
 __do_sys_exit_group+0x21/0x30 kernel/exit.c:983
 __se_sys_exit_group+0x14/0x20 kernel/exit.c:981
 __x64_sys_exit_group+0x1d/0x20 kernel/exit.c:981
 do_syscall_64+0xb8/0x100 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x45d81b
Code: Bad RIP value.
RSP: 002b:000000c420139f18 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045d81b
RDX: 0000000000000000 RSI: 0000000000885a19 RDI: 0000000000000002
RBP: 000000c420139f80 R08: 0000000000000002 R09: 0000000000000002
R10: 0000000000195405 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 000000000045b6a0 R15: 0000000000000001