Comment # 8 on bug 908163 from Thomas Blume

Seems that a crypt module triggers a kernel oops:

-->--
[   20.118036] systemd[442]: Executing: /usr/lib/systemd/systemd-modules-load
[   20.120079] BUG: unable to handle kernel paging request at ffffffffa001b000
[   20.120084] IP: [<ffffffff812a3188>] register_key_type+0x48/0xb0
[   20.120086] PGD 1e17067 PUD 1e18063 PMD bd6f3067 PTE 0
[   20.120088] Oops: 0000 [#1] PREEMPT SMP 
[   20.120096] Modules linked in: encrypted_keys(+) btrfs xor raid6_pq
crc32c_intel sdhci_acpi sdhci xhci_hcd mmc_core video button sg trusted tpm
[   20.120099] CPU: 1 PID: 442 Comm: systemd-modules Not tainted
3.17.4-2.g2d23787-desktop #1
[   20.120100] Hardware name: Dell Inc. XPS13 9333/0GFTRT, BIOS A02 12/11/2013
[   20.120102] task: ffff8800377c6090 ti: ffff8802135ec000 task.ti:
ffff8802135ec000
[   20.120106] RIP: 0010:[<ffffffff812a3188>]  [<ffffffff812a3188>]
register_key_type+0x48/0xb0
[   20.120107] RSP: 0018:ffff8802135efd10  EFLAGS: 00010202
[   20.120108] RAX: ffff8800377c6090 RBX: ffffffffa001b000 RCX:
0000000000000000
[   20.120109] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
ffffffff81e91a00
[   20.120110] RBP: ffffffffa006115a R08: 000000000000ffff R09:
ffff880037650ec0
[   20.120111] R10: 0000000000000029 R11: 00000000000022cc R12:
ffffffffa001b070
[   20.120113] R13: ffffffffa0062000 R14: ffffffffa00620d0 R15:
0000000000000001
[   20.120115] FS:  00007f7897799740(0000) GS:ffff88021f240000(0000)
knlGS:0000000000000000
[   20.120116] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   20.120117] CR2: ffffffffa001b000 CR3: 0000000213a8b000 CR4:
00000000001407e0
[   20.120118] Stack:
[   20.120121]  ffffffff81e1b020 ffff8802120d4340 0000000000000000
ffffffffa000b000
[   20.120123]  ffffffffa000b06f ffff8802920d4340 ffffffff81e1b020
ffffffff8100030c
[   20.120126]  ffff88021f4ea000 ffffffffa00620d0 0000000000000001
0000000000000282
[   20.120126] Call Trace:
[   20.120135]  [<ffffffffa000b06f>] init_encrypted+0x6f/0x1000
[encrypted_keys]
[   20.120145]  [<ffffffff8100030c>] do_one_initcall+0xcc/0x200
[   20.120153]  [<ffffffff810db4d2>] load_module+0x2372/0x2700
[   20.120160]  [<ffffffff810db9b5>] SYSC_finit_module+0x75/0xa0
[   20.120165]  [<ffffffff816354ad>] system_call_fastpath+0x1a/0x1f
[   20.120169]  [<00007f7896eb8829>] 0x7f7896eb8829
[   20.120183] Code: cf e8 be 00 49 81 fc 30 1a e9 81 49 8d 5c 24 90 74 42 49
8b 6d 00 eb 13 0f 1f 00 48 8b 43 70 48 3d 30 1a e9 81 48 8d 58 90 74 29 <48> 8b
3b 48 89 ee e8 2d 5b 08 00 85 c0 75 e1 bb ef ff ff ff 48 
[   20.120185] RIP  [<ffffffff812a3188>] register_key_type+0x48/0xb0
[   20.120186]  RSP <ffff8802135efd10>
[   20.120186] CR2: ffffffffa001b000
[   20.120188] ---[ end trace 35b66b44b468cfb4 ]---
--<--