FYI, we noticed the below changes on https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master commit 68c3a763cd182bbfdcb4bdd4561776c87158a6cc ("mm: add tracepoint for scanning pages") +------------------------------------------------+------------+------------+ | | f46465d797 | 68c3a763cd | +------------------------------------------------+------------+------------+ | boot_successes | 11 | 11 | | boot_failures | 20 | 20 | | IP-Config:Auto-configuration_of_network_failed | 20 | 1 | | BUG:unable_to_handle_kernel | 0 | 19 | | Oops | 0 | 19 | | RIP:khugepaged_scan_mm_slot | 0 | 19 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 19 | | backtrace:khugepaged | 0 | 19 | +------------------------------------------------+------------+------------+ [ 14.453377] systemd-journald[140]: Vacuuming... [ 14.454029] systemd-journald[140]: Vacuuming done, freed 0 bytes [ 14.455092] systemd-journald[140]: Flushing /dev/kmsg... [ 14.456250] BUG: unable to handle kernel NULL pointer dereference at (null) [ 14.457208] IP: [<ffffffff81165eb9>] khugepaged_scan_mm_slot+0x3f9/0x1490 [ 14.457208] PGD 0 [ 14.457208] Oops: 0000 [#1] PREEMPT [ 14.457208] CPU: 0 PID: 17 Comm: khugepaged Not tainted 4.3.0-rc1-00110-g68c3a76 #1 [ 14.457208] task: ffff88013a94d300 ti: ffff88013a960000 task.ti: ffff88013a960000 [ 14.457208] RIP: 0010:[<ffffffff81165eb9>] [<ffffffff81165eb9>] khugepaged_scan_mm_slot+0x3f9/0x1490 [ 14.457208] RSP: 0000:ffff88013a963ce8 EFLAGS: 00010246 [ 14.457208] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000007fe7b000 [ 14.457208] RDX: 0000000000000000 RSI: ffff880000000c88 RDI: 0000000000000000 [ 14.457208] RBP: ffff88013a963de0 R08: ffff880000000000 R09: 0000000000000000 [ 14.457208] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002 [ 14.457208] R13: 0000000000000000 R14: ffff88007f068000 R15: ffff88007f068000 [ 14.457208] FS: 0000000000000000(0000) GS:ffffffff81864000(0000) knlGS:0000000000000000 [ 14.457208] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 14.457208] CR2: 0000000000000000 CR3: 000000007f045000 CR4: 00000000000006b0 [ 14.457208] Stack: [ 14.457208] 00000000004352da 0000000000000046 00000000000001c1 ffff88013a963de0 [ 14.457208] ffffffff811262b9 0000000000000000 0000000000000000 0000000000000000 [ 14.457208] ffff88013a94d9f0 ffff88013a963e10 ffff88013a94d300 ffff88013a94d300 [ 14.457208] Call Trace: [ 14.457208] [<ffffffff811262b9>] ? __alloc_pages_nodemask+0x119/0x8e0 [ 14.457208] [<ffffffff8116704b>] ? khugepaged+0xfb/0x5a0 [ 14.457208] [<ffffffff8116737c>] khugepaged+0x42c/0x5a0 [ 14.457208] [<ffffffff810a09c0>] ? __wake_up_common+0x90/0x90 [ 14.457208] [<ffffffff81166f50>] ? khugepaged_scan_mm_slot+0x1490/0x1490 [ 14.457208] [<ffffffff810915e6>] kthread+0x106/0x120 [ 14.457208] [<ffffffff810914e0>] ? __kthread_parkme+0xb0/0xb0 [ 14.457208] [<ffffffff815a005f>] ret_from_fork+0x3f/0x70 [ 14.457208] [<ffffffff810914e0>] ? __kthread_parkme+0xb0/0xb0 [ 14.457208] Code: 2d ad 3a 82 00 0f 86 2f ff ff ff 44 89 6d d0 48 89 f3 49 89 f5 41 bc 03 00 00 00 48 8b 7d b8 e8 9e 92 43 00 c7 45 b8 00 00 00 00 <49> 8b 45 00 48 c1 e8 2d 48 89 c2 48 c1 ea 07 48 8b 14 d5 00 63 [ 14.457208] RIP [<ffffffff81165eb9>] khugepaged_scan_mm_slot+0x3f9/0x1490 [ 14.457208] RSP <ffff88013a963ce8> [ 14.457208] CR2: 0000000000000000 [ 14.457208] ---[ end trace 633a5342912b683c ]--- [ 14.457208] Kernel panic - not syncing: Fatal exception Thanks, Ying Huang