BUG: Bad page map in process syz-executor.3  pte:ffff8881c020f1c0 pmd:1b59bf067
addr:0000001b31039000 vm_flags:000000fb anon_vma:0000000000000000 mapping:ffff8881de3b4c48 index:19
file:memfd:syz-shared-mem fault:shmem_fault mmap:shmem_mmap readpage:0x0
CPU: 1 PID: 25295 Comm: syz-executor.3 Not tainted 5.4.242-syzkaller-00010-g39a9b92e9828 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x241 lib/dump_stack.c:118
 print_bad_pte+0x511/0x530 mm/memory.c:559
 vm_normal_page+0x135/0x1d0 mm/memory.c:648
 zap_pte_range mm/memory.c:1077 [inline]
 zap_pmd_range mm/memory.c:1221 [inline]
 zap_pud_range mm/memory.c:1250 [inline]
 zap_p4d_range mm/memory.c:1271 [inline]
 unmap_page_range+0xc00/0x2620 mm/memory.c:1292
 unmap_single_vma mm/memory.c:1337 [inline]
 unmap_vmas+0x355/0x4b0 mm/memory.c:1369
 exit_mmap+0x2bc/0x520 mm/mmap.c:3186
 __mmput+0x8e/0x2c0 kernel/fork.c:1093
 exit_mm kernel/exit.c:536 [inline]
 do_exit+0xc08/0x2bc0 kernel/exit.c:846
 do_group_exit+0x138/0x300 kernel/exit.c:982
 get_signal+0xdb1/0x1440 kernel/signal.c:2735
 do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159
 prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1