Hello,

FYI this happens in mainline kernel and dates back at least to
v4.16-rc5 . It's rather rare and beyond bisect.

[  716.494065] PASS concurrent_autogo_5ghz_ht40 4.803608 2018-03-23 09:57:21.586794
[  716.494069]
[  716.496923] passed all 1 test case(s)
[  716.496926]
[  716.511702] swap_info_get: Bad swap file entry 04000000
[  716.512731] BUG: Bad page map in process python2  pte:10000000000 pmd:17e8be067
[  716.513844] addr:00000000860ba23b vm_flags:00000070 anon_vma:          (null) mapping:000000004c76fece index:1e2
[  716.515160] file:libpcre.so.3.13.3 fault:filemap_fault mmap:generic_file_mmap readpage:simple_readpage
[  716.516418] CPU: 2 PID: 8907 Comm: python2 Not tainted 4.16.0-rc5 #1
[  716.517533] Hardware name:  /DH67GD, BIOS BLH6710H.86A.0132.2011.1007.1505 10/07/2011
[  716.518717] Call Trace:
[  716.519647]  dump_stack+0x5c/0x7c:
						dump_stack at lib/dump_stack.c:55
[  716.520619]  print_bad_pte+0x1de/0x290:
						print_bad_pte at mm/memory.c:776 (discriminator 12)
[  716.521609]  ? __swap_info_get+0x8e/0xa0:
						__swap_info_get at mm/swapfile.c:1063
[  716.522596]  unmap_page_range+0x803/0xa20:
						zap_pte_range at mm/memory.c:1384
						 (inlined by) zap_pmd_range at mm/memory.c:1441
						 (inlined by) zap_pud_range at mm/memory.c:1470
						 (inlined by) zap_p4d_range at mm/memory.c:1491
						 (inlined by) unmap_page_range at mm/memory.c:1512
[  716.523578]  unmap_vmas+0x4c/0xa0:
						unmap_vmas at mm/memory.c:1586 (discriminator 3)
[  716.524517]  exit_mmap+0x82/0x150:
						constant_test_bit at arch/x86/include/asm/bitops.h:328
						 (inlined by) mm_is_oom_victim at include/linux/oom.h:75
						 (inlined by) exit_mmap at mm/mmap.c:3022
[  716.525447]  mmput+0x67/0x160:
						__mmput at kernel/fork.c:961
						 (inlined by) mmput at kernel/fork.c:981
[  716.526354]  do_exit+0x2a5/0xb80:
						constant_test_bit at arch/x86/include/asm/bitops.h:328
						 (inlined by) test_ti_thread_flag at include/linux/thread_info.h:79
						 (inlined by) exit_mm at kernel/exit.c:545
						 (inlined by) do_exit at kernel/exit.c:852
[  716.527278]  ? __do_page_fault+0x27e/0x4f0:
						__do_page_fault at arch/x86/mm/fault.c:1449
[  716.528250]  do_group_exit+0x3a/0xa0:
						__read_once_size at include/linux/compiler.h:188
						 (inlined by) list_empty at include/linux/list.h:203
						 (inlined by) thread_group_empty at include/linux/sched/signal.h:594
						 (inlined by) do_group_exit at kernel/exit.c:953
[  716.529199]  SyS_exit_group+0x10/0x10
[  716.530143]  do_syscall_64+0x74/0x190:
						do_syscall_64 at arch/x86/entry/common.c:287
[  716.531089]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2:
						entry_SYSCALL_64_after_hwframe at arch/x86/entry/entry_64.S:246
[  716.532116] RIP: 0033:0x7fde0df8fa38
[  716.533070] RSP: 002b:00007ffccf97ba28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[  716.534235] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fde0df8fa38
[  716.535373] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
[  716.536522] RBP: 00007fde0e26e8e0 R08: 00000000000000e7 R09: ffffffffffffff98
[  716.537663] R10: 00007fde0816f178 R11: 0000000000000246 R12: 00007fde0e26e8e0
[  716.538799] R13: 00007fde0e273c20 R14: 0000000000000000 R15: 0000000000000000
[  716.539948] Disabling lock debugging due to kernel taint
[  716.548523] 2018-03-23 09:57:21 	./run-tests.py concurrent_autogo_crossconnect
[  716.548526]

Attached the full dmesg and kconfig.

Thanks,
Fengguang