I tried booting 2.4.0-test9-pre7 today on my work machine for the first time, and it hung up when one of my user programs was started. The process "receiver_d" uses sockets and shared memory and has worked without problems for years with many kernel versions up through 2.4.0-test9-pre5. I did manage to get this program running after several attempts, so the oops doesn't occur every time. Here is a snippet from /var/log/messages: kernel: Unable to handle kernel paging request at virtual address d0b88ffc kernel: printing eip: kernel: c0190c30 kernel: *pde = 01454063 kernel: *pte = 00000000 kernel: Oops: 0000 kernel: CPU: 0 kernel: EIP: 0010:[sys_shmat+204/636] kernel: EFLAGS: 00010246 kernel: eax: d0b89000 ebx: ffffffff ecx: 000001b6 edx: ffffffff kernel: esi: 00000000 edi: 00000000 ebp: 00000002 esp: cb50ff64 kernel: ds: 0018 es: 0018 ss: 0018 kernel: Process receiver_d (pid: 824, stackpage=cb50f000) kernel: Stack: ffffffff 00000000 00000000 bffff90c 00000003 00000001 00003800 00000000 kernel: 00000000 00000000 c010f65d ffffffff 00000000 00000000 cb50ffb4 cb50e000 kernel: bffff90c 00000000 bffff910 00000003 00000022 c010a818 cb50ffc4 c010a6ef kernel: Call Trace: [sys_ipc+361/524] [error_code+44/52] [system_call+51/56] kernel: Code: 8b 04 90 85 c0 75 07 c6 05 64 49 2f c0 01 85 c0 0f 84 8a 01 kernel: NET: 32 messages suppressed. I won't be at my work email until Monday, but can be reached at [EMAIL PROTECTED] if anyone wants to cc any further questions. Thanks, Steven Cole - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/