linux-kernel - Re: Kernel panic in kcryptd

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Date:	Thu, 30 Oct 2008 13:34:29 -0500
From:	Wesley Leggette <wleggette@...lix.net>
To:	Milan Broz <mbroz@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Mikulas Patocka <mpatocka@...hat.com>
Subject: Re: Kernel panic in kcryptd


On Oct 30, 2008, at 13:30, Milan Broz wrote:

>
> Wesley Leggette wrote:
>> When performing large IO, seemingly only when over the network, I
>> receive a kernel panic that seems to be happening in the kcryptd  
>> module.
>>
>> Here's two scenarios I've encountered this:
>>
>> ietd -> kcryptd -> mdadm raid6
>
> iscsi over dm crypt over mdadm?
> And I see snapshots in the log too, isn't there snapshot under
> the crypt mapping?

Two setups (and sorry, forget LVM):

iscsi over kcryptd over LVM over mdadm

also using samba

smbd over kcryptd over LVM over mdadm

Snapshots involved in LVM


>
>
> Is it reproducible without snapshots involved?

Will try. I'm trying to reproduce right now without "bigmem", but will  
stop if that is likely not the case.


Wesley

>
>
> Maybe it is related to recently fixed problem there...
> I think these patches solves the snapshot crashes (cc Mikulas)
>
> http://www.kernel.org/pub/linux/kernel/people/agk/patches/2.6/2.6.27/dm-snapshot-fix-primary_pe-race.patch
> http://www.kernel.org/pub/linux/kernel/people/agk/patches/2.6/editing/dm-snapshot-wait-for-chunks-in-destructor.patch
>
> Milan
>
>> Linux version 2.6.26-bpo.1-686-bigmem (Debian 2.6.26-4~bpo40+1) (nobse@...ian.org
>> ) (gcc version 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)) #1 SMP
>> Tue Sep 2 18:42:50 UTC 2008
>>
>>
>>
>> Oct 29 04:55:15 fargo kernel: [4285317.219492] ------------[ cut
>> here ]------------
>> Oct 29 04:55:15 fargo kernel: [4285317.219492] kernel BUG at mm/ 
>> slab.c:
>> 3008!
>> Oct 29 04:55:15 fargo kernel: [4285317.219492] invalid opcode: 0000
>> [#1] SMP
>> Oct 29 04:55:15 fargo kernel: [4285317.219492] Modules linked in:
>> usb_storage iscsi_trgt crc32c libcrc32c ipv6 ib_iser
>>  rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi
>> scsi_transport_iscsi ac battery xt_tcpudp nf_conn
>> track_ipv4 xt_state nf_conntrack iptable_filter ip_tables x_tables
>> ext3 jbd mbcache loop snd_hda_intel i2c_i801 i2c_co
>> re snd_pcm snd_timer snd soundcore iTCO_wdt intel_agp agpgart button
>> snd_page_alloc parport_pc parport evdev pcspkr fl
>> oppy reiserfs sha256_generic aes_i586 aes_generic cbc dm_crypt
>> crypto_blkcipher dm_mirror dm_log dm_snapshot dm_mod ra
>> id456 async_xor async_memcpy async_tx xor raid1 md_mod ide_generic
>> jmicron ide_core sd_mod sata_promise ata_generic ah
>> ci r8169 libata scsi_mod uhci_hcd dock ehci_hcd usbcore thermal
>> processor fan thermal_sys [last unloaded: libcrc32c]
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]
>> Oct 29 04:55:15 fargo kernel: [4285317.219492] Pid: 4191, comm:
>> kcryptd Not tainted (2.6.26-bpo.1-686-bigmem #1)
>> Oct 29 04:55:15 fargo kernel: [4285317.219492] EIP: 0060:[<c017b8e8>]
>> EFLAGS: 00010046 CPU: 0
>> Oct 29 04:55:15 fargo kernel: [4285317.219492] EIP is at
>> cache_alloc_refill+0xeb/0x48b
>> Oct 29 04:55:15 fargo kernel: [4285317.219492] EAX: 0000003b EBX:
>> 00000012 ECX: f6d4d1c0 EDX: df32c000
>> Oct 29 04:55:15 fargo kernel: [4285317.219492] ESI: c0878000 EDI:
>> 00000012 EBP: f540cac0 ESP: e70b5d78
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  DS: 007b ES: 007b FS:
>> 00d8 GS: 0000 SS: 0068
>> Oct 29 04:55:15 fargo kernel: [4285317.219492] Process kcryptd (pid:
>> 4191, ti=e70b4000 task=f696ba00 task.ti=e70b4000)
>> Oct 29 04:55:15 fargo kernel: [4285317.219492] Stack: 00000000
>> 0000003b 00011200 f6d4d1c0 f5443e00 00000000 c0136139 f
>> 51011ec
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]        e70b5de8
>> 00000202 c0136194 00000000 f6d4d1c0 00000206 00011200 c
>> 017b7b6
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]        00000000
>> f540ca80 00000000 00011210 c015f909 f8935be2 df32c4c8 f
>> 6430e40
>> Oct 29 04:55:15 fargo kernel: [4285317.219492] Call Trace:
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<c0136139>]
>> __queue_work+0x1c/0x28
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<c0136194>]  
>> queue_work
>> +0x33/0x3c
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<c017b7b6>]
>> kmem_cache_alloc+0x47/0x8e
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<c015f909>]
>> mempool_alloc+0x1c/0xba
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<f8935be2>]
>> copy_callback+0x0/0x2c [dm_snapshot]
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<f893533e>]
>> __find_pending_exception+0x62/0x122 [dm_snapshot]
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<f89355c1>]  
>> origin_map
>> +0x105/0x23f [dm_snapshot]
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<f89064e2>]  
>> __map_bio
>> +0x4d/0x12a [dm_mod]
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<f8906309>]  
>> clone_bio
>> +0x3f/0x6f [dm_mod]
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<f8906ff1>]
>> __split_bio+0x156/0x3f7 [dm_mod]
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<f896e33f>]
>> crypto_cbc_encrypt+0x12b/0x13f [cbc]
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<f894d6d8>]
>> aes_encrypt+0x0/0xc [aes_i586]
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<f89076ff>]  
>> dm_request
>> +0xd3/0xf2 [dm_mod]
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<c01dc365>]
>> generic_make_request+0x34d/0x37b
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<f89488a9>]
>> crypt_convert+0x20f/0x240 [dm_crypt]
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<f8948a98>]
>> kcryptd_crypt+0x1be/0x267 [dm_crypt]
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<f89488da>]
>> kcryptd_crypt+0x0/0x267 [dm_crypt]
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<c0135d32>]
>> run_workqueue+0x74/0xf2
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<c013640d>]
>> worker_thread+0x0/0xbd
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<c01364c0>]
>> worker_thread+0xb3/0xbd
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<c01386ac>]
>> autoremove_wake_function+0x0/0x2d
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<c01385eb>] kthread
>> +0x38/0x5d
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<c01385b3>] kthread
>> +0x0/0x5d
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]  [<c01094ff>]
>> kernel_thread_helper+0x7/0x10
>> Oct 29 04:55:15 fargo kernel: [4285317.219492]   
>> =======================
>> Oct 29 04:55:15 fargo kernel: [4285317.219492] Code: 8b 75 00 39 ee  
>> 75
>> 15 8b 75 10 8d 45 10 c7 45 34 01 00 00 00 39 c6
>>  0f 84 a5 00 00 00 8b 4c 24 0c 8b 81 98 00 00 00 39 46 10 72 37 <0f>
>> 0b eb fe 8b 44 24 10 8b 5e 14 8b 08 8b 44 24 0c 8
>> b 90 8c 00
>> Oct 29 04:55:15 fargo kernel: [4285317.219492] EIP: [<c017b8e8>]
>> cache_alloc_refill+0xeb/0x48b SS:ESP 0068:e70b5d78
>> Oct 29 04:55:15 fargo kernel: [4285317.219492] ---[ end trace
>> 0bb16d783d7c2616 ]---

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