Hi,

* Herbert Xu <herbert@gondor.apana.org.au> wrote:

>       crypto: pcrypt - Add pcrypt crypto parallelization wrapper

-tip testing started triggering the following frequent boot crash yesterday, 
on 64-bit x86:

 |  calling  pcrypt_init+0x0/0xee @ 1
 |  BUG: unable to handle kernel NULL pointer dereference at (null)
 |  IP: [<ffffffff8126550b>] memcpy+0xb/0xb0
 |  Call Trace:
 |   [<ffffffff810c2f38>] ? padata_alloc+0x98/0x150
 |   [<ffffffff82158c51>] ? pcrypt_init+0x0/0xee
 |   [<ffffffff82158ccc>] pcrypt_init+0x7b/0xee

  ( Full oops attached below. Config attached as well. )

I have bisected it back to the following upstream commit:

 |
 | 5068c7a883d1694f0fb3631b664827644153cd08 is the first bad commit
 | commit 5068c7a883d1694f0fb3631b664827644153cd08
 | Author: Steffen Klassert <steffen.klassert@secunet.com>
 | Date:   Thu Jan 7 15:57:19 2010 +1100
 |
 |     crypto: pcrypt - Add pcrypt crypto parallelization wrapper
 |

And have confirmed it via more testing that reverting the following two 
commits:

  5a1436b: crypto: pcrypt - call the complete function on error
  5068c7a: crypto: pcrypt - Add pcrypt crypto parallelization wrapper

Solves the crash. I have pushed out the reverts into tip:out-of-tree for now, 
and can test any real fix as well.

Thanks,

	Ingo

-------------->
Calling  crypto_ctr_module_init+0x0/0x3e @ 1
initcall crypto_ctr_module_init+0x0/0x3e returned 0 after 0 usecs
calling  pcrypt_init+0x0/0xee @ 1
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffff8126550b>] memcpy+0xb/0xb0
PGD 0 
Oops: 0002 [#1] SMP 
last sysfs file: 
CPU 1 
Modules linked in:

Pid: 1, comm: swapper Not tainted 2.6.33-01768-g43a834d #19338 A8N-E/System Product Name
RIP: 0010:[<ffffffff8126550b>]  [<ffffffff8126550b>] memcpy+0xb/0xb0
RSP: 0018:ffff88003f875e88  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff81f5f740 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff81f5f740 RDI: 0000000000000000
RBP: ffff88003f875ec0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88003e5317b0
R13: ffff88003f97a690 R14: ffff88003e5317b0 R15: ffff88003f9287d0
FS:  0000000000000000(0000) GS:ffff880004200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 0000000001be8000 CR4: 00000000000006a0
DR0: ffffffff82c160bc DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Process swapper (pid: 1, threadinfo ffff88003f874000, task ffff88003f878000)
Stack:
 ffffffff810c2f38 ffff880000000018 ffffffff81f5f740 ffffffff82158c51
<0> 00000001552321fe 0000000000000002 0000000000000000 ffff88003f875ee0
<0> ffffffff82158ccc 00000001552321fe 0000000000000000 ffff88003f875f10
Call Trace:
 [<ffffffff810c2f38>] ? padata_alloc+0x98/0x150
 [<ffffffff82158c51>] ? pcrypt_init+0x0/0xee
 [<ffffffff82158ccc>] pcrypt_init+0x7b/0xee
 [<ffffffff810001dc>] do_one_initcall+0x3c/0x200
 [<ffffffff8213e73c>] kernel_init+0x161/0x1b7
 [<ffffffff81004184>] kernel_thread_helper+0x4/0x10
 [<ffffffff817d2150>] ? restore_args+0x0/0x30
 [<ffffffff8213e5db>] ? kernel_init+0x0/0x1b7
 [<ffffffff81004180>] ? kernel_thread_helper+0x0/0x10
Code: 81 ea d8 1f 00 00 48 3b 42 20 73 07 48 8b 50 f9 31 c0 c3 31 d2 48 c7 c0 f2 ff ff ff c3 90 90 90 48 89 f8 89 d1 c1 e9 03 83 e2 07 <f3> 48 a5 89 d1 f3 a4 c3 8b 1e 4c 8b 46 08 4c 89 1f 4c 89 47 08 
RIP  [<ffffffff8126550b>] memcpy+0xb/0xb0
 RSP <ffff88003f875e88>
CR2: 0000000000000000
---[ end trace 5a5d197966b56a2e ]---
swapper used greatest stack depth: 5016 bytes left
Kernel panic - not syncing: Attempted to kill init!