My Linode crashed!

BUG: unable to handle kernel paging request at virtual address 031c03d8
 printing eip:
c015a51b
18361000 -> *pde = 00000004:0b1b2027
1464f000 -> *pme = 00000000:00000000
Oops: 0000 [#1]
SMP
Modules linked in:
CPU:    0
EIP:    0061:[<c015a51b>]    Not tainted VLI
EFLAGS: 00010002   (2.6.18.8-domU-linode7 #1)
EIP is at free_block+0x6d/0xfe
eax: 7936743d   ebx: c1539c94   ecx: 0000000b   edx: 031c03d8
esi: e1719580   edi: c153c780   ebp: c1539c94   esp: c157ff04
ds: 007b   es: 007b   ss: 0069
Process events/0 (pid: 10, ti=c157e000 task=e17a1ab0 task.ti=c157e000)
Stack: c154aa14 0000000b 00000000 c1539c94 c1539c80 0000000b c1547fc0 c015a60f
       00000000 00000000 00000000 c153c780 c1547fc0 c153c780 c1570840 00000000
       c015a9b8 00000000 00000000 c144df80 c144df84 c012b82a 00000000 c1570840
Call Trace:
 [<c015a60f>] drain_array+0x63/0xde
 [<c015a9b8>] cache_reap+0x47/0x137
 [<c012b82a>] run_workqueue+0x71/0xe5
 [<c015a971>] cache_reap+0x0/0x137
 [<c012ba76>] worker_thread+0xef/0x128
 [<c011746c>] default_wake_function+0x0/0xc
 [<c012b987>] worker_thread+0x0/0x128
 [<c012e89a>] kthread+0xde/0xe2
 [<c012e7bc>] kthread+0x0/0xe2
 [<c0102b75>] kernel_thread_helper+0x5/0xb
Code: 08 01 83 c5 04 8b 44 24 08 39 44 24 04 74 c0 8b 75 00 8d 96 00 00 00 40 c1 ea 0c c1 e2 05 03 15 a8 2a 5e c0 8b 02 f6 c4 40 75 7c <8b> 02 84 c0 79 7e 8b 4a 1c 8b 44 24 20 8b 5c 87 50 8b 11 8b 41
EIP: [<c015a51b>] free_block+0x6d/0xfe SS:ESP 0069:c157ff04
 <1>BUG: unable to handle kernel paging request at virtual address 27a5c1c7
 printing eip:
c01404d5
06389000 -> *pde = 00000005:d68e2027
04f1f000 -> *pme = 00000000:00000000
Oops: 0002 [#2]
SMP
Modules linked in:
CPU:    0
EIP:    0061:[<c01404d5>]    Not tainted VLI
EFLAGS: 00010002   (2.6.18.8-domU-linode7 #1)
EIP is at __rmqueue+0x3e/0xe7
eax: c0515184   ebx: c0515184   ecx: c142e118   edx: 27a5c1c3
esi: c0514900   edi: 00000000   ebp: 00000000   esp: d9975dd0
ds: 007b   es: 007b   ss: 0069
Process php5-cgi (pid: 5569, ti=d9974000 task=d7429570 task.ti=d9974000)
Stack: c142e100 c051498c c0514900 c0514980 00000000 c01407e8 00000002 00000044
       d1a86000 00000001 00000000 00000002 00000000 000280d2 c0515e28 00000001
       0000001f 0000001b 00000004 00000000 c0515e28 d7429570 000280d2 00000000
Call Trace:
 [<c01407e8>] get_page_from_freelist+0x26a/0x43b
 [<c0140a08>] __alloc_pages+0x4f/0x2d2
 [<c0142a33>] __pagevec_lru_add_active+0xef/0x12c
 [<c014c9a5>] __handle_mm_fault+0xfc3/0x15db
 [<c013de28>] __generic_file_aio_read+0x16e/0x243
 [<c013bc05>] file_read_actor+0x0/0xc7
 [<c015db64>] do_sync_read+0xc1/0x11c
 [<c0131741>] hrtimer_run_queues+0xc1/0x193
 [<c01103ea>] do_page_fault+0x10f/0xc70
 [<c0120d86>] __do_softirq+0x8b/0x116
 [<c015dfc5>] vfs_read+0x100/0x160
 [<c015ea2e>] sys_read+0x41/0x6a
 [<c01102db>] do_page_fault+0x0/0xc70
 [<c01052e3>] error_code+0x2b/0x30
Code: 00 8d 90 84 08 00 00 8d 44 2d 00 01 e8 01 c0 01 c0 8d 1c 10 8b 0b 89 ef 39 d9 0f 84 85 00 00 00 8d 41 e8 89 04 24 8b 11 8b 41 04 <89> 42 04 89 10 c7 01 00 01 10 00 c7 41 04 00 02 20 00 0f ba 71
EIP: [<c01404d5>] __rmqueue+0x3e/0xe7 SS:ESP 0069:d9975dd0

What does that all mean? I'm on a 4k block size. Username alucard. I'm on Xen and I was running 2.6.18.8-domU-linode7.

Apparently -linode7 was crashy. Try -linode10.

EDIT:

http://www.linode.com/forums/viewtopic.php?t=3297

oho. thanks.

I had "latest 2.6" selected so I'm in -linode10 now

If you manage to hit the 4k blocksize bug, it won't cause a panic, instead the kernel will remount your file system as read only.

Edit: Like this: http://www.linode.com/forums/viewtopic.php?t=3402

i just had this happen to me on my L540 (Newark59)

BUG: unable to handle kernel paging request at virtual address 00088b23
 printing eip:
0cd0d000 -> *pde = 00000002:16782027
1acd1000 -> *pme = 00000000:00000000
Oops: 0002 [#1]
SMP 
Modules linked in:
CPU:    0
EIP:    0061:[<c0161641>]    Not tainted VLI
EFLAGS: 00010082   (2.6.18.8-linode10 #2) 
EIP is at free_block+0x83/0xfe
eax: 00000000   ebx: e151ad00   ecx: d268c000   edx: 00088b1f
esi: d268c80c   edi: e1505080   ebp: e15b0ee0   esp: cd733d24
ds: 007b   es: 007b   ss: 0069
Process collectinfo.pl (pid: 21262, ti=cd732000 task=e1908c30 task.ti=cd732000)
Stack: 00000000 0000001b 00000013 e15b0e94 e1505080 df7e8a00 e1510400 c01617ef 
       00000000 e15b0e80 0000001b e151ad00 e15b0e80 00000000 df7e8a00 00000000 
       c0161504 df7e8a98 df7e8a98 cd733da0 00000042 c017c40e df7e8aa0 c017ceaf 
Call Trace:
 [<c01617ef>] cache_flusharray+0x55/0xc1
 [<c0161504>] kmem_cache_free+0xc8/0xee
 [<c017c40e>] destroy_inode+0x2e/0x47
 [<c017ceaf>] dispose_list+0x6e/0xcf
 [<c017d0f6>] shrink_icache_memory+0x1e6/0x223
 [<c014a8f0>] shrink_slab+0x111/0x186
 [<c014bee4>] try_to_free_pages+0x137/0x1f3
 [<c0147a37>] __alloc_pages+0x12e/0x2d2
 [<c01539cc>] __handle_mm_fault+0xfd2/0x1664
 [<c0173dcf>] do_path_lookup+0xab/0x28d
 [<c013158b>] hrtimer_run_queues+0xc1/0x192
 [<c011007a>] do_page_fault+0x10f/0xc70
 [<c0120a96>] __do_softirq+0x8b/0x116
 [<c0106bde>] do_IRQ+0x30/0x62
 [<c034f87d>] evtchn_do_upcall+0xe5/0x1e5
 [<c010ff6b>] do_page_fault+0x0/0xc70
 [<c01052e3>] error_code+0x2b/0x30
Code: 00 40 c1 ea 0c c1 e2 05 03 15 a8 dc 5e c0 8b 02 f6 c4 40 75 7c 8b 02 84 c0 79 7e 8b 4a 1c 8b 44 24 20 8b 5c 87 50 8b 11 8b 41 04 <89> 42 04 89 10 c7 01 00 01 10 00 c7 41 04 00 02 20 00 2b 71 0c 
EIP: [<c0161641>] free_block+0x83/0xfe SS:ESP 0069:cd733d24
 <0>------------[ cut here ]------------
kernel BUG at mm/slab.c:595!
invalid opcode: 0000 [#2]
SMP 
Modules linked in:
CPU:    2
EIP:    0061:[<c0161515>]    Not tainted VLI
EFLAGS: 00210246   (2.6.18.8-linode10 #2) 
EIP is at kmem_cache_free+0xd9/0xee
eax: 80080000   ebx: d2c5d0d4   ecx: e1505080   edx: c1258ba0
esi: c3b93000   edi: d2c5d03c   ebp: d9d0df44   esp: d9d0deac
ds: 007b   es: 007b   ss: 0069
Process miniserv.pl (pid: 21158, ti=d9d0c000 task=e156ae70 task.ti=d9d0c000)
Stack: d2c5d0d4 c3b93000 c500b000 d9d0df44 c017c40e d2c5d0d4 c017c486 d8100c94 
       c017b107 00000000 c3b93000 c0174148 d8100c94 d9e6ed94 d9e6ed94 d8100d14 
       d8100c94 00000000 d9e6ed94 c154ec40 d13cf0a7 0000000c c500b011 00000010 
Call Trace:
 [<c017c40e>] destroy_inode+0x2e/0x47
 [<c017c486>] iput+0x5f/0x6b
 [<c017b107>] dput+0x69/0x12d
 [<c0174148>] sys_renameat+0x197/0x1b9
 [<c0171362>] pipe_readv+0x31c/0x3d6
 [<c011007a>] do_page_fault+0x10f/0xc70
 [<c017b129>] dput+0x8b/0x12d
 [<c0166151>] __fput+0x120/0x174
 [<c0174191>] sys_rename+0x27/0x2b
 [<c0105137>] syscall_call+0x7/0xb
Code: f6 75 df 80 38 00 74 da 5b 5e 5f 5d e9 85 df 1e 00 89 da 89 c8 e8 96 02 00 00 8b 03 eb 99 0f 0b 6a 0d 96 dd 4c c0 e9 5f ff ff ff <0f> 0b 53 02 96 dd 4c c0 e9 49 ff ff ff 8b 52 0c e9 37 ff ff ff 
EIP: [<c0161515>] kmem_cache_free+0xd9/0xee SS:ESP 0069:d9d0deac