------------[ cut here ]------------ WARNING: CPU: 0 PID: 1080 at mm/khugepaged.c:1643 collapse_file+0x1f9d/0x4170 mm/khugepaged.c:1643 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 1080 Comm: khugepaged Not tainted 5.4.0-rc4-next-20191022 #0 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+0x172/0x1f0 lib/dump_stack.c:113 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x35 kernel/panic.c:582 report_bug+0x289/0x300 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:174 [inline] fixup_bug arch/x86/kernel/traps.c:169 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:collapse_file+0x1f9d/0x4170 mm/khugepaged.c:1643 Code: a1 c0 ff 31 c9 ba 01 00 00 00 4c 89 fe 48 8b bd c0 fe ff ff e8 e4 e9 ec ff e9 b4 fd ff ff 4c 8b bd 88 fe ff ff e8 93 a1 c0 ff <0f> 0b 4c 8b a3 50 ff ff ff c7 85 80 fe ff ff 00 00 00 00 e9 05 f6 RSP: 0018:ffff8880a7ef7ad0 EFLAGS: 00010293 RAX: ffff8880a7de2440 RBX: ffff8880a7ef7c88 RCX: ffffffff81b2b688 RDX: 0000000000000000 RSI: ffffffff81b2b9ad RDI: 0000000000000001 RBP: ffff8880a7ef7cb0 R08: ffff8880a7de2440 R09: fffff9400047cb41 R10: fffff9400047cb40 R11: ffffea00023e5a07 R12: 0000000000000001 R13: ffffea00023a75c8 R14: 0000000000000000 R15: ffffea00021f0000 khugepaged_scan_file mm/khugepaged.c:1881 [inline] khugepaged_scan_mm_slot mm/khugepaged.c:1979 [inline] khugepaged_do_scan mm/khugepaged.c:2063 [inline] khugepaged+0x2da9/0x4360 mm/khugepaged.c:2108 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds..