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SubjectRe: BUG ext4_inode_cache: Padding overwritten. 0xffff88000008fe00-0xffff88000008fe32
On 09/07/2010 07:54 AM, Eric Sandeen wrote:
> Justin Mattock wrote:
>> Im not sure if theres already assigned to this or not... but noticed
>> this in dmesg..
>> only thing I remember was building glibc, and looking into an issue
>> with it, suspended a few times and such..
>
> hm so ext4's inode cache got overwritten, indicative of memory corruption
> but hard to know how it happened; it's not necessarily (maybe even likely)
> an ext4 bug... not quite sure how to track it down though.
>
>
> Also the M taint indicates:
>
> 5: 'M' if any processor has reported a Machine Check Exception,
> ' ' if no Machine Check Exceptions have occurred.
>
> so something may have gone wrong before this.
>
> -Eric

I was doing a bisect on glibc to find a certain commit, maybe the
constant installation of those libraries, and the combination of putting
the machine a sleep while I was doing other things caused this to fire
off.(after doing all of this, and letting the machine idol and run,
nothing like this showed up.)

>
>> [13299.426905] =============================================================================
>> [13299.426913] BUG ext4_inode_cache: Padding overwritten.
>> 0xffff88000008fe00-0xffff88000008fe32
>> [13299.426919] -----------------------------------------------------------------------------
>> [13299.426922]
>> [13299.426928] INFO: Slab 0xffffea0000001ea0 objects=13 used=11
>> fp=0xffff88000008d798 flags=0x4081
>> [13299.426936] Pid: 17044, comm: rm Tainted: G M
>> 2.6.36-rc3-00001-gb0425ef #2
>> [13299.426942] Call Trace:
>> [13299.426955] [<ffffffff810e3a5c>] slab_err+0x89/0x95
>> [13299.426966] [<ffffffff8109c5fe>] ? call_rcu_sched+0x10/0x12
>> [13299.426974] [<ffffffff8109c609>] ? call_rcu+0x9/0xb
>> [13299.426982] [<ffffffff810e48b9>] slab_pad_check.part.46+0xc0/0xf7
>> [13299.426991] [<ffffffff8114c1b9>] ? ext4_destroy_inode+0x96/0x9d
>> [13299.426999] [<ffffffff810e4984>] check_slab+0x94/0x9a
>> [13299.427008] [<ffffffff813e5c38>] __slab_free+0x15e/0x342
>> [13299.427008] [<ffffffff810e4f34>] kmem_cache_free+0x96/0xed
>> [13299.427008] [<ffffffff8114c1b9>] ext4_destroy_inode+0x96/0x9d
>> [13299.427008] [<ffffffff81114fd9>] ? __fsnotify_inode_delete+0x9/0xb
>> [13299.427008] [<ffffffff810fd046>] ? __destroy_inode+0x27/0x76
>> [13299.427008] [<ffffffff810fd4fb>] destroy_inode+0x2a/0x3f
>> [13299.427008] [<ffffffff810fd948>] iput+0x223/0x228
>> [13299.427008] [<ffffffff810f4bcb>] do_unlinkat+0x118/0x16b
>> [13299.427008] [<ffffffff810ee3ad>] ? sys_newfstatat+0x25/0x2e
>> [13299.427008] [<ffffffff81094841>] ? audit_syscall_entry+0x1d1/0x1fd
>> [13299.427008] [<ffffffff810f641e>] sys_unlinkat+0x24/0x26
>> [13299.427008] [<ffffffff81027602>] system_call_fastpath+0x16/0x1b
>> [13299.427008] Padding 0xffff88000008fb8b: 00 ad 4e ad de ff ff ff
>> ff 00 00 00 00 ff ff ff .­N­Þÿÿÿÿ....ÿÿÿ
>> [13299.427008] Padding 0xffff88000008fb9b: ff ff ff ff ff a0 fb 08
>> 00 00 88 ff ff a0 fb 08 ÿÿÿÿÿ.û....ÿÿ.û.
>> [13299.427008] Padding 0xffff88000008fbab: 00 00 88 ff ff 00 00 00
>> 00 00 00 00 00 b8 fb 08 ...ÿÿ........¸û.
>> [13299.427008] Padding 0xffff88000008fbbb: 00 00 88 ff ff b8 fb 08
>> 00 00 88 ff ff 00 00 00 ...ÿÿ¸û....ÿÿ...
>> [13299.427008] Padding 0xffff88000008fbcb: 00 00 00 00 00 25 53 d9
>> 92 00 00 00 00 00 00 00 .....%SÙ........
>> [13299.427008] Padding 0xffff88000008fbdb: 00 00 00 00 00 00 00 00
>> 00 00 00 00 00 d9 59 bb .............ÙY»
>> [13299.427008] Padding 0xffff88000008fbeb: 00 01 00 00 00 00 00 00
>> 00 00 00 00 00 10 1a b7 ...............·
>> [13299.427008] Padding 0xffff88000008fbfb: 2e 00 88 ff ff ff ff ff
>> ff ff ff ff ff ff ff ff ...ÿÿÿÿÿÿÿÿÿÿÿÿÿ
>> [13299.427008] Padding 0xffff88000008fc0b: ff ff ff ff ff 00 00 00
>> 00 00 00 00 00 00 00 00 ÿÿÿÿÿ...........
>> [13299.427008] Padding 0xffff88000008fc1b: 00 00 00 00 00 00 00 00
>> 00 00 00 00 00 00 01 10 ................
>> [13299.427008] Padding 0xffff88000008fc2b: 00 00 00 ad de 00 02 20
>> 00 00 00 ad de 80 f9 08 ...­Þ......­Þ.ù.
>> [13299.427008] Padding 0xffff88000008fc3b: 00 00 88 ff ff 00 00 00
>> 00 5a 5a 5a 5a b8 b6 28 ...ÿÿ....ZZZZ¸¶(
>> [13299.427008] Padding 0xffff88000008fc4b: 00 00 00 00 00 00 00 00
>> 00 01 00 00 00 02 00 00 ................
>> [13299.427008] Padding 0xffff88000008fc5b: 00 00 00 00 00 a2 99 81
>> 4c 00 00 00 00 13 41 21 .....¢..L.....A!
>> [13299.427008] Padding 0xffff88000008fc6b: 37 00 00 00 00 70 fc 08
>> 00 00 88 ff ff 70 fc 08 7....pü....ÿÿpü.
>> [13299.427008] Padding 0xffff88000008fc7b: 00 00 88 ff ff 01 01 00
>> 00 ad 4e ad de ff ff ff ...ÿÿ....­N­Þÿÿÿ
>> [13299.427008] Padding 0xffff88000008fc8b: ff 5a 5a 5a 5a ff ff ff
>> ff ff ff ff ff ff ff ff ÿZZZZÿÿÿÿÿÿÿÿÿÿÿ
>> [13299.427008] Padding 0xffff88000008fc9b: ff 00 00 00 00 00 00 00
>> 00 00 00 00 00 00 00 5a ÿ..............Z
>> [13299.427008] Padding 0xffff88000008fcab: 5a 5a 5a 5a 5a 00 00 00
>> 00 00 00 00 00 00 00 00 ZZZZZ...........
>> [13299.427008] Padding 0xffff88000008fcbb: 00 1c 00 5a 5a 0e 0e 00
>> 00 ad 4e ad de ff ff ff ...ZZ....­N­Þÿÿÿ
>> [13299.427008] Padding 0xffff88000008fccb: ff 5a 5a 5a 5a ff ff ff
>> ff ff ff ff ff d8 fc 08 ÿZZZZÿÿÿÿÿÿÿÿØü.
>> [13299.427008] Padding 0xffff88000008fcdb: 00 00 88 ff ff d8 fc 08
>> 00 00 88 ff ff 00 00 00 ...ÿÿØü....ÿÿ...
>> [13299.427008] Padding 0xffff88000008fceb: 00 ad 4e ad de ff ff ff
>> ff 5a 5a 5a 5a ff ff ff .­N­ÞÿÿÿÿZZZZÿÿÿ
>> [13299.427008] Padding 0xffff88000008fcfb: ff ff ff ff ff 00 00 00
>> 00 00 00 00 00 bb 59 03 ÿÿÿÿÿ........»Y.
>> [13299.427008] Padding 0xffff88000008fd0b: 00 bb 59 03 00 cc cc cc
>> cc cc cc cc cc e8 f3 08 .»Y..ÌÌÌÌÌÌÌÌèó.
>> [13299.427008] Padding 0xffff88000008fd1b: 00 00 88 ff ff 9f 60 14
>> 81 ff ff ff ff 01 00 00 ...ÿÿ.`..ÿÿÿÿ...
>> [13299.427008] Padding 0xffff88000008fd2b: 00 c0 28 00 00 a5 58 bb
>> 00 01 00 00 00 b9 c1 14 .À(..¥X».....¹Á.
>> [13299.427008] Padding 0xffff88000008fd3b: 81 ff ff ff ff 01 00 00
>> 00 0f 1c 00 00 b0 7a ba .ÿÿÿÿ........°zº
>> [13299.427008] Padding 0xffff88000008fd4b: 00 01 00 00 00 5a 5a 5a
>> 5a 5a 5a 5a 5a 5a 5a 5a .....ZZZZZZZZZZZ
>> [13299.427008] Padding 0xffff88000008fd5b: 5a 5a 5a 5a 5a 5a 5a 5a
>> 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
>> [13299.427008] Padding 0xffff88000008fd6b: 5a 5a 5a 5a 5a 5a 5a 5a
>> 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
>> [13299.427008] Padding 0xffff88000008fd7b: 5a 5a 5a 5a 5a 5a 5a 5a
>> 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
>> [13299.427008] Padding 0xffff88000008fd8b: 5a 5a 5a 5a 5a 5a 5a 5a
>> 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
>> [13299.427008] Padding 0xffff88000008fd9b: 5a 5a 5a 5a 5a 5a 5a 5a
>> 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
>> [13299.427008] Padding 0xffff88000008fdab: 5a 5a 5a 5a 5a 5a 5a 5a
>> 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
>> [13299.427008] Padding 0xffff88000008fdbb: 5a 5a 5a 5a 5a 5a 5a 5a
>> 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
>> [13299.427008] Padding 0xffff88000008fdcb: 5a 5a 5a 5a 5a 5a 5a 5a
>> 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
>> [13299.427008] Padding 0xffff88000008fddb: 5a 5a 5a 5a 5a 5a 5a 5a
>> 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
>> [13299.427008] Padding 0xffff88000008fdeb: 5a 5a 5a 5a 5a 5a 5a 5a
>> 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
>> [13299.427008] Padding 0xffff88000008fdfb: 5a 5a 5a 5a 5a 00 5a 5a
>> 5a 10 20 0f 3f 00 80 00 ZZZZZ.ZZZ...?...
>> [13299.427008] Padding 0xffff88000008fe0b: 00 c7 60 ed 3f 3f 00 10
>> df ed 3f ff 07 10 c0 ed .Ç`í??..ßí?ÿ..Àí
>> [13299.427008] Padding 0xffff88000008fe1b: 3f fa 33 c9 33 d2 b8 3c
>> fe 08 00 0f 01 c8 b8 31 ?ú3É3Ò¸<þ....ȸ1
>> [13299.427008] Padding 0xffff88000008fe2b: 00 00 00 0f 01 c9 eb e9
>> .....Éëé
>> [13299.427008] FIX ext4_inode_cache: Restoring
>> 0xffff88000008fb8b-0xffff88000008fe32=0x5a
>> [13299.427008]
>> [13369.168442] general protection fault: 0000 [#1] SMP
>> [13369.168448] last sysfs file: /sys/devices/platform/applesmc.768/light
>> [13369.168451] CPU 0
>> [13369.168453] Modules linked in: xfrm4_mode_transport xcbc rmd160
>> sha512_generic sco bnep xt_tcpudp ipt_LOG iptable_nat nf_nat xt_state
>> nf_conntrack_ftp nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4
>> iptable_filter ip_tables x_tables snd_hda_codec_idt ath9k
>> firewire_ohci firewire_core ath9k_common evdev ath9k_hw ohci1394
>> joydev button thermal battery sky2 ac ath snd_hda_intel snd_hda_codec
>> snd_hwdep snd_pcm snd_timer snd soundcore snd_page_alloc i2c_i801
>> video aes_x86_64 lzo lzo_compress tun kvm_intel ipcomp xfrm_ipcomp
>> crypto_null sha256_generic cbc des_generic cast5 blowfish serpent
>> camellia twofish_generic twofish_x86_64 twofish_common ctr ah4 esp4
>> authenc raw1394 ieee1394 uhci_hcd ehci_hcd hci_uart rfcomm btusb hidp
>> l2cap bluetooth coretemp acpi_cpufreq processor mperf appletouch
>> applesmc
>> [13369.168522]
>> [13369.168526] Pid: 21876, comm: objdump Tainted: G M
>> 2.6.36-rc3-00001-gb0425ef #2 Mac-F42187C8/MacBookPro2,2
>> [13369.168529] RIP: 0010:[<ffffffff811a19ad>] [<ffffffff811a19ad>]
>> selinux_dentry_open+0x27/0x91
>> [13369.168540] RSP: 0018:ffff88000dcb7c98 EFLAGS: 00010292
>> [13369.168543] RAX: 5a5a5a5a5a5a5a5a RBX: ffff88000008f980 RCX: ffff880001800000
>> [13369.168545] RDX: ffff880001800000 RSI: ffff88000ddf6800 RDI: ffff880030d6f500
>> [13369.168548] RBP: ffff88000dcb7cb8 R08: 0000000000000000 R09: ffff88001aa70360
>> [13369.168551] R10: ffff880030f25c6c R11: ffff88000191c000 R12: ffff880030d6f500
>> [13369.168553] R13: ffff88001e6b79a0 R14: ffff88000ddf6800 R15: ffff88000008f980
>> [13369.168557] FS: 00002ab84b7ebb20(0000) GS:ffff880001800000(0000)
>> knlGS:0000000000000000
>> [13369.168560] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [13369.168562] CR2: 00002ab84b52b300 CR3: 00000000276ed000 CR4: 00000000000006f0
>> [13369.168565] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> [13369.168568] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>> [13369.168571] Process objdump (pid: 21876, threadinfo
>> ffff88000dcb6000, task ffff88001e799ec0)
>> [13369.168573] Stack:
>> [13369.168575] ffff880030d6f500 ffff88003ecf08c0 ffff88001aa70360
>> 0000000000000000
>> [13369.168579]<0> ffff88000dcb7cd8 ffffffff8119afc9 ffff880030d6f500
>> ffff880030d6f500
>> [13369.168584]<0> ffff88000dcb7d48 ffffffff810e8ebc ffff88000dcb7d18
>> ffffffff810f2f78
>> [13369.168589] Call Trace:
>> [13369.168595] [<ffffffff8119afc9>] security_dentry_open+0x19/0x4c
>> [13369.168601] [<ffffffff810e8ebc>] __dentry_open+0x159/0x2be
>> [13369.168607] [<ffffffff810f2f78>] ? generic_permission+0x17/0xa4
>> [13369.168611] [<ffffffff810e9e96>] nameidata_to_filp+0x3a/0x4b
>> [13369.168616] [<ffffffff810f58cb>] do_last+0x504/0x691
>> [13369.168620] [<ffffffff810f5c48>] do_filp_open+0x1f0/0x621
>> [13369.168625] [<ffffffff810ff29f>] ? alloc_fd+0x102/0x114
>> [13369.168629] [<ffffffff810e9f02>] do_sys_open+0x5b/0xf7
>> [13369.168633] [<ffffffff810e9fb9>] sys_open+0x1b/0x1d
>> [13369.168639] [<ffffffff81027602>] system_call_fastpath+0x16/0x1b
>> [13369.168642] Code: ff ff c9 c3 55 48 89 e5 41 56 49 89 f6 41 55 41
>> 54 49 89 fc 53 48 8b 47 18 4c 8b af c0 00 00 00 48 8b 58 28 48 8b 83
>> 78 02 00 00<8b> 40 1c 41 89 45 08 e8 a1 af ff ff 41 89 45 0c 41 8b 44
>> 24 54
>> [13369.168681] RIP [<ffffffff811a19ad>] selinux_dentry_open+0x27/0x91
>> [13369.168685] RSP<ffff88000dcb7c98>
>> [13369.168688] ---[ end trace a79a28a58d538d97 ]---
>>
>> as for performance issues,would of never know about this if I hadnt
>> looked in dmesg.
>>
>>
>
>

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