5.1 and 5.1.1: BUG: unable to handle kernel paging request at ffffea0002030000

[Justin Piszcz]

Hello,

I've turned off zram/zswap and I am still seeing the following during
periods of heavy I/O, I am returning to 5.0.xx in the meantime.

Kernel: 5.1.1
Arch: x86_64
Dist: Debian x86_64

[29967.019411] BUG: unable to handle kernel paging request at ffffea0002030000
[29967.019414] #PF error: [normal kernel read fault]
[29967.019415] PGD 103ffee067 P4D 103ffee067 PUD 103ffed067 PMD 0
[29967.019417] Oops: 0000 [#1] SMP PTI
[29967.019419] CPU: 10 PID: 77 Comm: khugepaged Tainted: G
   T 5.1.1 #4
[29967.019420] Hardware name: Supermicro X9SRL-F/X9SRL-F, BIOS 3.2 01/16/2015
[29967.019424] RIP: 0010:isolate_freepages_block+0xb9/0x310
[29967.019425] Code: 24 28 48 c1 e0 06 40 f6 c5 1f 48 89 44 24 20 49
8d 45 79 48 89 44 24 18 44 89 f0 4d 89 ee 45 89 fd 41 89 c7 0f 84 ef
00 00 00 <48> 8b 03 41 83 c4 01 a9 00 00 01 00 75 0c 48 8b 43 08 a8 01
0f 84
[29967.019426] RSP: 0018:ffffc900003a7860 EFLAGS: 00010246
[29967.019427] RAX: 0000000000000000 RBX: ffffea0002030000 RCX: ffffc900003a7b69
[29967.019428] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff828c4750
[29967.019429] RBP: 0000000000080c00 R08: 0000000000000001 R09: 0000000000000000
[29967.019429] R10: 0000000000000206 R11: ffffffff828c4390 R12: 0000000000000000
[29967.019430] R13: 0000000000000000 R14: ffffc900003a7af0 R15: 0000000000000000
[29967.019431] FS:  0000000000000000(0000) GS:ffff88903fa80000(0000)
knlGS:0000000000000000
[29967.019432] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[29967.019432] CR2: ffffea0002030000 CR3: 000000000280e001 CR4: 00000000001606e0
[29967.019433] Call Trace:
[29967.019436]  compaction_alloc+0x83d/0x8d0
[29967.019439]  migrate_pages+0x30d/0x750
[29967.019441]  ? isolate_migratepages_block+0xa10/0xa10
[29967.019442]  ? __reset_isolation_suitable+0x110/0x110
[29967.019443]  compact_zone+0x684/0xa70
[29967.019445]  compact_zone_order+0x109/0x150
[29967.019447]  ? schedule_timeout+0x1ba/0x290
[29967.019461]  ? record_times+0x13/0xa0
[29967.019462]  try_to_compact_pages+0x10d/0x220
[29967.019465]  __alloc_pages_direct_compact+0x93/0x180
[29967.019466]  __alloc_pages_nodemask+0x6c7/0xe20
[29967.019469]  ? __wake_up_common_lock+0xb0/0xb0
[29967.019470]  khugepaged+0x31f/0x19c0
[29967.019472]  ? __wake_up_common_lock+0xb0/0xb0
[29967.019473]  ? collapse_shmem.isra.4+0xc20/0xc20
[29967.019476]  kthread+0x100/0x120
[29967.019478]  ? __kthread_create_on_node+0x1b0/0x1b0
[29967.019480]  ret_from_fork+0x35/0x40
[29967.019481] CR2: ffffea0002030000
[29967.019482] ---[ end trace 8a9801ed5e182a98 ]---
[29967.019484] RIP: 0010:isolate_freepages_block+0xb9/0x310
[29967.019484] Code: 24 28 48 c1 e0 06 40 f6 c5 1f 48 89 44 24 20 49
8d 45 79 48 89 44 24 18 44 89 f0 4d 89 ee 45 89 fd 41 89 c7 0f 84 ef
00 00 00 <48> 8b 03 41 83 c4 01 a9 00 00 01 00 75 0c 48 8b 43 08 a8 01
0f 84
[29967.019485] RSP: 0018:ffffc900003a7860 EFLAGS: 00010246
[29967.019486] RAX: 0000000000000000 RBX: ffffea0002030000 RCX: ffffc900003a7b69
[29967.019487] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff828c4750
[29967.019487] RBP: 0000000000080c00 R08: 0000000000000001 R09: 0000000000000000
[29967.019488] R10: 0000000000000206 R11: ffffffff828c4390 R12: 0000000000000000
[29967.019489] R13: 0000000000000000 R14: ffffc900003a7af0 R15: 0000000000000000
[29967.019489] FS:  0000000000000000(0000) GS:ffff88903fa80000(0000)
knlGS:0000000000000000
[29967.019490] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[29967.019491] CR2: ffffea0002030000 CR3: 000000000280e001 CR4: 00000000001606e0

Thanks,

Justin.