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kernel update causes ps to segfault

Since upgrading the kernel on our webserver, when root runs ps, it

Unable to handle kernel NULL pointer dereference at virtual address
 printing eip:
 *pde = 00000000
 Oops: 0000
 CPU:    0
 EIP:    0010:[<c014bfee>]    Not tainted
 EFLAGS: 00010202
 eax: 00000000   ebx: d6538000   ecx: c6b92000   edx: 00013ca3
 esi: 00000000   edi: c6b92000   ebp: d3ca3000   esp: d6539f58
 ds: 0018   es: 0018   ss: 0018
 Process ps (pid: 7517, stackpage=d6539000)
 Stack: d8423c80 00000000 c014c02f c6b92000 d8423c80 c6b92000 ffffffea
 c6b92000 d3ca3000 00000000 da3e3c40 ffffffea 000007ff dfd57380
 000007ff c0131ef6 da3e3c40 bffff01c 000007ff da3e3c60
 d6538000 bffff01c 
 Call Trace: [<c014c02f>] [<c014c33a>] [<c0131ef6>] [<c0106e83>] 

 Code: f6 40 7c 01 75 14 b8 00 e0 ff ff 21 e0 f6 80 d6 01 00 00 08

I get nothing with gdb cause there's no debugging symbols in ps.

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