BUG: Bad page map in process syz.3.2603 pte:ffffffff85ee3950 pmd:1ca03f067 page:ffffea0001e84700 refcount:0 mapcount:-1 mapping:0000000000000000 index:0x0 flags: 0x4000000000000008(dirty) raw: 4000000000000008 ffffea0001e84708 ffffea0001e84708 0000000000000000 raw: 0000000000000000 0000000000000000 00000000fffffffe 0000000000000000 page dumped because: bad pte page_owner info is not present (never set?) addr:0000001b32239000 vm_flags:000000fb anon_vma:0000000000000000 mapping:ffff8881e9fbebc0 index:419 file:syz.qEzszz fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage CPU: 1 PID: 7885 Comm: syz.3.2603 Not tainted 5.4.290-syzkaller-00002-g41adfeb3d639 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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:560 zap_pte_range mm/memory.c:1107 [inline] zap_pmd_range mm/memory.c:1222 [inline] zap_pud_range mm/memory.c:1251 [inline] zap_p4d_range mm/memory.c:1272 [inline] unmap_page_range+0x1588/0x2620 mm/memory.c:1293 unmap_single_vma mm/memory.c:1338 [inline] unmap_vmas+0x355/0x4b0 mm/memory.c:1370 exit_mmap+0x2bc/0x520 mm/mmap.c:3191 __mmput+0x8e/0x2c0 kernel/fork.c:1101 exit_mm kernel/exit.c:538 [inline] do_exit+0xc08/0x2bc0 kernel/exit.c:848 do_group_exit+0x138/0x300 kernel/exit.c:984 get_signal+0xdb1/0x1440 kernel/signal.c:2738 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 ret_from_intr+0x1c/0x1c RIP: 0033:0x7fa7bf665171 Code: 00 00 00 00 00 0f 1f 40 00 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 73 01 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:0000200000000540 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007fa7bf87dfa0 RCX: 00007fa7bf665169 RDX: 0000200000000180 RSI: 0000200000000540 RDI: 0000000080100000 RBP: 00007fa7bf6e62a0 R08: 00002000000005c0 R09: 00002000000005c0 R10: 0000200000000580 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fa7bf87dfa0 R15: 00007fffc5cc6378