2.0.35 recurrent datagram oops

Camm Maguire (camm@enhanced.com)
Mon, 21 Sep 1998 13:58:16 -0400 (EDT)

Greetings! I've written about this before, and have had this bug in
many, if not all 2.0.3x kernels, including the latest stable kernel,
2.0.35.

The process pcqetix1 just sleeps in a tight loop doing revfrom
followed by a write to a circular shared memory buffer. This oops
occurs in the same place within a week:

-----------------------------------------------------------------------------
Sep 15 06:30:02 intech12 kernel: Unable to handle kernel NULL pointer dereference at virtual address c0000008
Sep 15 06:30:02 intech12 kernel: current->tss.cr3 = 00943000, %cr3 = 00943000
Sep 15 06:30:02 intech12 kernel: *pde = 00102067
Sep 15 06:30:02 intech12 kernel: *pte = 00000000
Sep 15 06:30:02 intech12 kernel: Oops: 0000
Sep 15 06:30:02 intech12 kernel: CPU: 0
Sep 15 06:30:02 intech12 kernel: EIP: 0010:[memcpy_toiovec+82/144]
Sep 15 06:30:02 intech12 kernel: EFLAGS: 00010212
Sep 15 06:30:02 intech12 kernel: eax: 00001004 ebx: 00000190 ecx: 00000064 edx: bfffeae0
Sep 15 06:30:02 intech12 kernel: esi: 00000008 edi: bfffeae0 ebp: 00ea9edc esp: 00ea9e28
Sep 15 06:30:02 intech12 kernel: ds: 0018 es: 002b fs: 002b gs: 002b ss: 0018
Sep 15 06:30:02 intech12 kernel: Process pcqetix1 (pid: 4490, process nr: 25, stackpage=00ea9000)
Sep 15 06:30:02 intech12 kernel: Stack: 00040018 00000190 00ea9ee4 00044018 00ea9f64 00000190 0013bceb 00ea9edc
Sep 15 06:30:02 intech12 kernel: 00000008 00000190 0014ed91 00f0c5e4 00000008 00ea9edc 00000190 00044018
Sep 15 06:30:02 intech12 kernel: 00ea9ed8 00000000 00000000 00f0c5e4 0064c000 00153416 00044018 00ea9f64
Sep 15 06:30:02 intech12 kernel: Call Trace: [skb_copy_datagram_iovec+27/32] [udp_recvmsg+113/192] [inet_recvmsg+118/144] [sys_recvfrom+327/400] [udp_rcv+955/976] [ip_rcv+927/1248] [sys_socketcall+643/848]
Sep 15 06:30:02 intech12 kernel: [system_call+85/124]
Sep 15 06:30:02 intech12 kernel: Code: f3 a5 83 e3 03 89 d9 f3 a4 07 8b 5c 24 10 01 5c 24 1c 29 5c
-----------------------------------------------------------------------------

Any help most appreciated!

-- 
Camm Maguire			     			camm@enhanced.com
==========================================================================
"The earth is but one country, and mankind its citizens."  --  Baha'u'llah


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