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[Bug 1460402] Re: FS-Cache: Assertion failed

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>
Date: Mon, 01 Jun 2015 17:29:19 -0000
Reply-to: Bug 1460402 <1460402@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Did this issue start happening after an update/upgrade?  Was there a
prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.1 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".


Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.1-rc6-unstable/

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https://bugs.launchpad.net/bugs/1460402

Title:
  FS-Cache: Assertion failed

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Happens in two nodes at the same time.

  Node 1:

  [205458.631304] ------------[ cut here ]------------
  [205458.633636] kernel BUG at /build/buildd/linux-3.13.0/fs/fscache/page.c:244!
  [205458.633636] invalid opcode: 0000 [#1] SMP 
  [205458.633636] Modules linked in: veth xt_nat xt_tcpudp xt_addrtype xt_conntrack ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 iptable_filter ip_tables x_tables nf_nat nf_conntrack bridge stp llc dm_thin_pool dm_persistent_data dm_bufio dm_bio_prison libcrc32c cachefiles nfsv3 nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache dm_crypt syscopyarea sysfillrect sysimgblt fb_sys_fops serio_raw isofs crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd floppy psmouse
  [205458.633636] CPU: 3 PID: 6217 Comm: php5-fpm Not tainted 3.13.0-53-generic #89-Ubuntu
  [205458.633636] Hardware name: Xen HVM domU, BIOS 4.2.amazon 05/06/2015
  [205458.633636] task: ffff8801e3ede000 ti: ffff880107ace000 task.ti: ffff880107ace000
  [205458.633636] RIP: 0010:[<ffffffffa00b8c14>]  [<ffffffffa00b8c14>] fscache_release_retrieval_op+0x74/0x80 [fscache]
  [205458.633636] RSP: 0018:ffff880107acfad8  EFLAGS: 00010286
  [205458.633636] RAX: 000000000000000f RBX: ffff880014be1a80 RCX: 0000000000000000
  [205458.633636] RDX: ffff8801efc6f020 RSI: ffff8801efc6d408 RDI: 0000000000000246
  [205458.633636] RBP: ffff880107acfae0 R08: 0000000000000096 R09: 0000000000000231
  [205458.633636] R10: ffffffff8185ade0 R11: ffff880107acf806 R12: ffff8800c3e469f8
  [205458.633636] R13: ffff880107acfbbc R14: 00000000ffffff97 R15: ffff8801e3ff9b68
  [205458.633636] FS:  00007f383346c740(0000) GS:ffff8801efc60000(0000) knlGS:0000000000000000
  [205458.633636] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [205458.633636] CR2: 00007f382032cf08 CR3: 00000001206ea000 CR4: 00000000001406e0
  [205458.633636] Stack:
  [205458.633636]  ffff880014be1a80 ffff880107acfb08 ffffffffa00b6eab ffff880014be1a80
  [205458.633636]  ffff8800c3e469f8 ffff880107acfbbc ffff880107acfb58 ffffffffa00b9753
  [205458.633636]  ffff8800c3e46a00 ffff8801e3ff9b00 ffff880107acfcb8 00000000ffffff97
  [205458.633636] Call Trace:
  [205458.633636]  [<ffffffffa00b6eab>] fscache_put_operation+0x5b/0x220 [fscache]
  [205458.633636]  [<ffffffffa00b9753>] __fscache_read_or_alloc_pages+0x1b3/0x350 [fscache]
  [205458.633636]  [<ffffffffa01645c1>] __nfs_readpages_from_fscache+0x71/0x1b0 [nfs]
  [205458.633636]  [<ffffffffa015b7b8>] nfs_readpages+0xa8/0x190 [nfs]
  [205458.633636]  [<ffffffff81197c53>] ? alloc_pages_current+0xa3/0x160
  [205458.633636]  [<ffffffff8114f757>] ? __page_cache_alloc+0x97/0xc0
  [205458.633636]  [<ffffffff8115ba39>] __do_page_cache_readahead+0x1b9/0x260
  [205458.633636]  [<ffffffff8115bf12>] ondemand_readahead+0x152/0x2a0
  [205458.633636]  [<ffffffff8115c091>] page_cache_sync_readahead+0x31/0x50
  [205458.633636]  [<ffffffff81151b65>] generic_file_aio_read+0x4c5/0x700
  [205458.633636]  [<ffffffffa0150949>] nfs_file_read+0x69/0xf0 [nfs]
  [205458.633636]  [<ffffffff811bd8ba>] do_sync_read+0x5a/0x90
  [205458.633636]  [<ffffffff811bdf55>] vfs_read+0x95/0x160
  [205458.633636]  [<ffffffff811bea69>] SyS_read+0x49/0xa0
  [205458.633636]  [<ffffffff8173391d>] system_call_fastpath+0x1a/0x1f
  [205458.633636] Code: c0 e8 92 3b 66 e1 48 c7 c7 ae cc 0b a0 31 c0 e8 84 3b 66 e1 48 63 b3 90 00 00 00 31 d2 48 c7 c7 e3 cc 0b a0 31 c0 e8 6d 3b 66 e1 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 
  [205458.633636] RIP  [<ffffffffa00b8c14>] fscache_release_retrieval_op+0x74/0x80 [fscache]
  [205458.633636]  RSP <ffff880107acfad8>
  [205458.833163] ---[ end trace 30960a6ba86a197f ]---

  Node 2:

  [360136.745210] FS-Cache: Assertion failed
  [360136.747121] 1 == 0 is false
  [360136.748704] ------------[ cut here ]------------
  [360136.751217] kernel BUG at /build/buildd/linux-3.13.0/fs/fscache/page.c:244!
  [360136.752666] invalid opcode: 0000 [#1] SMP 
  [360136.752666] Modules linked in: veth xt_nat xt_tcpudp xt_addrtype xt_conntrack ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 iptable_filter ip_tables x_tables nf_nat nf_conntrack bridge stp llc dm_thin_pool dm_persistent_data dm_bufio dm_bio_prison libcrc32c cachefiles nfsv3 nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache dm_crypt syscopyarea sysfillrect sysimgblt fb_sys_fops serio_raw isofs crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse floppy
  [360136.752666] CPU: 2 PID: 7105 Comm: php5-fpm Not tainted 3.13.0-53-generic #89-Ubuntu
  [360136.752666] Hardware name: Xen HVM domU, BIOS 4.2.amazon 05/06/2015
  [360136.752666] task: ffff880116254800 ti: ffff88010cb8a000 task.ti: ffff88010cb8a000
  [360136.752666] RIP: 0010:[<ffffffffa00b1c14>]  [<ffffffffa00b1c14>] fscache_release_retrieval_op+0x74/0x80 [fscache]
  [360136.752666] RSP: 0018:ffff88010cb8bad8  EFLAGS: 00010286
  [360136.752666] RAX: 000000000000000f RBX: ffff88001fa9a300 RCX: 0000000000000006
  [360136.752666] RDX: 0000000000000007 RSI: 000000004cae4cac RDI: 0000000000000246
  [360136.752666] RBP: ffff88010cb8bae0 R08: 0000000000000096 R09: 0000000000000239
  [360136.752666] R10: ffffffff8185ade0 R11: ffff88010cb8b806 R12: ffff8800d4e4ae18
  [360136.752666] R13: ffff88010cb8bbbc R14: 00000000ffffff97 R15: ffff88008df750e8
  [360136.752666] FS:  00007f4233932740(0000) GS:ffff8801efc40000(0000) knlGS:0000000000000000
  [360136.752666] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [360136.752666] CR2: 00000000040e9008 CR3: 000000010de9c000 CR4: 00000000001406e0
  [360136.752666] Stack:
  [360136.752666]  ffff88001fa9a300 ffff88010cb8bb08 ffffffffa00afeab ffff88001fa9a300
  [360136.752666]  ffff8800d4e4ae18 ffff88010cb8bbbc ffff88010cb8bb58 ffffffffa00b2753
  [360136.752666]  ffff8800d4e4ae20 ffff88008df75080 ffff88010cb8bcb8 00000000ffffff97
  [360136.752666] Call Trace:
  [360136.752666]  [<ffffffffa00afeab>] fscache_put_operation+0x5b/0x220 [fscache]
  [360136.752666]  [<ffffffffa00b2753>] __fscache_read_or_alloc_pages+0x1b3/0x350 [fscache]
  [360136.752666]  [<ffffffffa015d5c1>] __nfs_readpages_from_fscache+0x71/0x1b0 [nfs]
  [360136.752666]  [<ffffffffa01547b8>] nfs_readpages+0xa8/0x190 [nfs]
  [360136.752666]  [<ffffffff81197c53>] ? alloc_pages_current+0xa3/0x160
  [360136.752666]  [<ffffffff8114f757>] ? __page_cache_alloc+0x97/0xc0
  [360136.752666]  [<ffffffff8115ba39>] __do_page_cache_readahead+0x1b9/0x260
  [360136.752666]  [<ffffffff8115bf12>] ondemand_readahead+0x152/0x2a0
  [360136.752666]  [<ffffffff8115c091>] page_cache_sync_readahead+0x31/0x50
  [360136.752666]  [<ffffffff81151b65>] generic_file_aio_read+0x4c5/0x700
  [360136.752666]  [<ffffffffa0149949>] nfs_file_read+0x69/0xf0 [nfs]
  [360136.752666]  [<ffffffff811bd8ba>] do_sync_read+0x5a/0x90
  [360136.752666]  [<ffffffff811bdf55>] vfs_read+0x95/0x160
  [360136.752666]  [<ffffffff811bea69>] SyS_read+0x49/0xa0
  [360136.752666]  [<ffffffff8173391d>] system_call_fastpath+0x1a/0x1f
  [360136.752666] Code: c0 e8 92 ab 66 e1 48 c7 c7 ae 5c 0b a0 31 c0 e8 84 ab 66 e1 48 63 b3 90 00 00 00 31 d2 48 c7 c7 e3 5c 0b a0 31 c0 e8 6d ab 66 e1 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 
  [360136.752666] RIP  [<ffffffffa00b1c14>] fscache_release_retrieval_op+0x74/0x80 [fscache]
  [360136.752666]  RSP <ffff88010cb8bad8>
  [360136.935505] ---[ end trace 5e0dd6a39f65225d ]---
  [361660.951453] 
  [361660.952687] FS-Cache: Assertion failed
  [361660.954870] 1 == 0 is false
  [361660.956679] ------------[ cut here ]------------
  [361660.959155] kernel BUG at /build/buildd/linux-3.13.0/fs/fscache/page.c:244!
  [361660.960653] invalid opcode: 0000 [#2] SMP 
  [361660.960653] Modules linked in: veth xt_nat xt_tcpudp xt_addrtype xt_conntrack ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 iptable_filter ip_tables x_tables nf_nat nf_conntrack bridge stp llc dm_thin_pool dm_persistent_data dm_bufio dm_bio_prison libcrc32c cachefiles nfsv3 nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache dm_crypt syscopyarea sysfillrect sysimgblt fb_sys_fops serio_raw isofs crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse floppy
  [361660.960653] CPU: 0 PID: 7839 Comm: php5-fpm Tainted: G      D       3.13.0-53-generic #89-Ubuntu
  [361660.960653] Hardware name: Xen HVM domU, BIOS 4.2.amazon 05/06/2015
  [361660.960653] task: ffff8800094c0000 ti: ffff880007daa000 task.ti: ffff880007daa000
  [361660.960653] RIP: 0010:[<ffffffffa00b1c14>]  [<ffffffffa00b1c14>] fscache_release_retrieval_op+0x74/0x80 [fscache]
  [361660.960653] RSP: 0018:ffff880007dabad8  EFLAGS: 00010286
  [361660.960653] RAX: 000000000000000f RBX: ffff88000903be40 RCX: 0000000000000006
  [361660.960653] RDX: 0000000000000007 RSI: 0000000053625360 RDI: 0000000000000246
  [361660.960653] RBP: ffff880007dabae0 R08: 0000000000000096 R09: 0000000000000265
  [361660.960653] R10: ffffffff8185ade0 R11: ffff880007dab806 R12: ffff8800117e3aa8
  [361660.960653] R13: ffff880007dabbbc R14: 00000000ffffff97 R15: ffff8800e7b707e8
  [361660.960653] FS:  00007f4233932740(0000) GS:ffff8801efc00000(0000) knlGS:0000000000000000
  [361660.960653] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [361660.960653] CR2: 00007faa5c88e208 CR3: 000000001fbe0000 CR4: 00000000001406f0
  [361660.960653] Stack:
  [361660.960653]  ffff88000903be40 ffff880007dabb08 ffffffffa00afeab ffff88000903be40
  [361660.960653]  ffff8800117e3aa8 ffff880007dabbbc ffff880007dabb58 ffffffffa00b2753
  [361660.960653]  ffff8800117e3ab0 ffff8800e7b70780 ffff880007dabcb8 00000000ffffff97
  [361660.960653] Call Trace:
  [361660.960653]  [<ffffffffa00afeab>] fscache_put_operation+0x5b/0x220 [fscache]
  [361660.960653]  [<ffffffffa00b2753>] __fscache_read_or_alloc_pages+0x1b3/0x350 [fscache]
  [361660.960653]  [<ffffffffa015d5c1>] __nfs_readpages_from_fscache+0x71/0x1b0 [nfs]
  [361660.960653]  [<ffffffffa01547b8>] nfs_readpages+0xa8/0x190 [nfs]
  [361660.960653]  [<ffffffff81197c53>] ? alloc_pages_current+0xa3/0x160
  [361660.960653]  [<ffffffff8114f757>] ? __page_cache_alloc+0x97/0xc0
  [361660.960653]  [<ffffffff8115ba39>] __do_page_cache_readahead+0x1b9/0x260
  [361660.960653]  [<ffffffff8115bf12>] ondemand_readahead+0x152/0x2a0
  [361660.960653]  [<ffffffff8115c091>] page_cache_sync_readahead+0x31/0x50
  [361660.960653]  [<ffffffff81151b65>] generic_file_aio_read+0x4c5/0x700
  [361660.960653]  [<ffffffffa0149949>] nfs_file_read+0x69/0xf0 [nfs]
  [361660.960653]  [<ffffffff811bd8ba>] do_sync_read+0x5a/0x90
  [361660.960653]  [<ffffffff811bdf55>] vfs_read+0x95/0x160
  [361660.960653]  [<ffffffff811bea69>] SyS_read+0x49/0xa0
  [361660.960653]  [<ffffffff8173391d>] system_call_fastpath+0x1a/0x1f
  [361660.960653] Code: c0 e8 92 ab 66 e1 48 c7 c7 ae 5c 0b a0 31 c0 e8 84 ab 66 e1 48 63 b3 90 00 00 00 31 d2 48 c7 c7 e3 5c 0b a0 31 c0 e8 6d ab 66 e1 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 
  [361660.960653] RIP  [<ffffffffa00b1c14>] fscache_release_retrieval_op+0x74/0x80 [fscache]
  [361660.960653]  RSP <ffff880007dabad8>
  [361661.134212] ---[ end trace 5e0dd6a39f65225e ]---
  [363766.284093] 
  [363766.285960] FS-Cache: Assertion failed
  [363766.289822] 1 == 0 is false
  [363766.292641] ------------[ cut here ]------------
  [363766.295666] kernel BUG at /build/buildd/linux-3.13.0/fs/fscache/page.c:244!
  [363766.296609] invalid opcode: 0000 [#3] SMP 
  [363766.296609] Modules linked in: veth xt_nat xt_tcpudp xt_addrtype xt_conntrack ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 iptable_filter ip_tables x_tables nf_nat nf_conntrack bridge stp llc dm_thin_pool dm_persistent_data dm_bufio dm_bio_prison libcrc32c cachefiles nfsv3 nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache dm_crypt syscopyarea sysfillrect sysimgblt fb_sys_fops serio_raw isofs crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse floppy
  [363766.296609] CPU: 0 PID: 8794 Comm: php5-fpm Tainted: G      D       3.13.0-53-generic #89-Ubuntu
  [363766.296609] Hardware name: Xen HVM domU, BIOS 4.2.amazon 05/06/2015
  [363766.296609] task: ffff88003704b000 ti: ffff8801025ce000 task.ti: ffff8801025ce000
  [363766.296609] RIP: 0010:[<ffffffffa00b1c14>]  [<ffffffffa00b1c14>] fscache_release_retrieval_op+0x74/0x80 [fscache]
  [363766.296609] RSP: 0018:ffff8801025cfad8  EFLAGS: 00010286
  [363766.296609] RAX: 000000000000000f RBX: ffff880105a92780 RCX: 0000000000000000
  [363766.296609] RDX: ffff8801efc0f020 RSI: ffff8801efc0d408 RDI: 0000000000000246
  [363766.296609] RBP: ffff8801025cfae0 R08: 0000000000000096 R09: 0000000000000291
  [363766.296609] R10: ffffffff8185ade0 R11: ffff8801025cf806 R12: ffff8800117e3aa8
  [363766.296609] R13: ffff8801025cfbbc R14: 00000000ffffff97 R15: ffff8800e7b707e8
  [363766.296609] FS:  00007f4233932740(0000) GS:ffff8801efc00000(0000) knlGS:0000000000000000
  [363766.296609] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [363766.296609] CR2: 00000000030ba160 CR3: 0000000100915000 CR4: 00000000001406f0
  [363766.296609] Stack:
  [363766.296609]  ffff880105a92780 ffff8801025cfb08 ffffffffa00afeab ffff880105a92780
  [363766.296609]  ffff8800117e3aa8 ffff8801025cfbbc ffff8801025cfb58 ffffffffa00b2753
  [363766.296609]  ffff8800117e3ab0 ffff8800e7b70780 ffff8801025cfcb8 00000000ffffff97
  [363766.296609] Call Trace:
  [363766.296609]  [<ffffffffa00afeab>] fscache_put_operation+0x5b/0x220 [fscache]
  [363766.296609]  [<ffffffffa00b2753>] __fscache_read_or_alloc_pages+0x1b3/0x350 [fscache]
  [363766.296609]  [<ffffffffa015d5c1>] __nfs_readpages_from_fscache+0x71/0x1b0 [nfs]
  [363766.296609]  [<ffffffffa01547b8>] nfs_readpages+0xa8/0x190 [nfs]
  [363766.296609]  [<ffffffff81197c53>] ? alloc_pages_current+0xa3/0x160
  [363766.296609]  [<ffffffff8114f757>] ? __page_cache_alloc+0x97/0xc0
  [363766.296609]  [<ffffffff8115ba39>] __do_page_cache_readahead+0x1b9/0x260
  [363766.296609]  [<ffffffff8115bf12>] ondemand_readahead+0x152/0x2a0
  [363766.296609]  [<ffffffff8115c091>] page_cache_sync_readahead+0x31/0x50
  [363766.296609]  [<ffffffff81151b65>] generic_file_aio_read+0x4c5/0x700
  [363766.296609]  [<ffffffffa0149949>] nfs_file_read+0x69/0xf0 [nfs]
  [363766.296609]  [<ffffffff811bd8ba>] do_sync_read+0x5a/0x90
  [363766.296609]  [<ffffffff811bdf55>] vfs_read+0x95/0x160
  [363766.296609]  [<ffffffff811bea69>] SyS_read+0x49/0xa0
  [363766.296609]  [<ffffffff8173391d>] system_call_fastpath+0x1a/0x1f
  [363766.296609] Code: c0 e8 92 ab 66 e1 48 c7 c7 ae 5c 0b a0 31 c0 e8 84 ab 66 e1 48 63 b3 90 00 00 00 31 d2 48 c7 c7 e3 5c 0b a0 31 c0 e8 6d ab 66 e1 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 
  [363766.296609] RIP  [<ffffffffa00b1c14>] fscache_release_retrieval_op+0x74/0x80 [fscache]
  [363766.296609]  RSP <ffff8801025cfad8>
  [363766.499901] ---[ end trace 5e0dd6a39f65225f ]---
  --- 
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 May 31 09:49 seq
   crw-rw---- 1 root audio 116, 33 May 31 09:49 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.14.1-0ubuntu3.10
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory
  DistroRelease: Ubuntu 14.04
  Ec2AMI: ami-e3e89994
  Ec2AMIManifest: (unknown)
  Ec2AvailabilityZone: eu-west-1a
  Ec2InstanceType: c3.xlarge
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory
  Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
  MachineType: Xen HVM domU
  Package: linux (not installed)
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-53-generic root=UUID=efbeda5e-eb44-475f-83dc-eb9b42239a4a ro console=tty1 console=ttyS0
  ProcVersionSignature: Ubuntu 3.13.0-53.89-generic 3.13.11-ckt19
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-53-generic N/A
   linux-backports-modules-3.13.0-53-generic  N/A
   linux-firmware                             N/A
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  trusty ec2-images
  Uname: Linux 3.13.0-53-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  WifiSyslog:
   
  _MarkForUpload: True
  dmi.bios.date: 05/06/2015
  dmi.bios.vendor: Xen
  dmi.bios.version: 4.2.amazon
  dmi.chassis.type: 1
  dmi.chassis.vendor: Xen
  dmi.modalias: dmi:bvnXen:bvr4.2.amazon:bd05/06/2015:svnXen:pnHVMdomU:pvr4.2.amazon:cvnXen:ct1:cvr:
  dmi.product.name: HVM domU
  dmi.product.version: 4.2.amazon
  dmi.sys.vendor: Xen

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References

[Bug 1460402] [NEW] FS-Cache: Assertion failed
From: Gabriel Pérez, 2015-05-31