Hi posted this on the forum but then found the mailing list :-) so hope it's ok to post to the list aswell. we have a centos 4.3 server running samba, winbind and squid authenticating by winbind to our NT domain. Once in a while in the early hours it has the below error in /var/log/messages this causes the machine to fail and we carn't connect to it. It's double dutch to me, hopefully someone on here will have a suggestion though. TIA Aug 22 04:03:15 wssproxy kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000024 Aug 22 04:03:15 wssproxy kernel: printing eip: Aug 22 04:03:15 wssproxy kernel: c0187833 Aug 22 04:03:15 wssproxy kernel: *pde = 1859f067 Aug 22 04:03:15 wssproxy kernel: Oops: 0000 [#1] Aug 22 04:03:15 wssproxy kernel: Modules linked in: md5 ipv6 autofs4 sunrpc button battery ac shpchp pcnet32 mii floppy dm_snapshot dm_zero dm_mirror ext3 jbd dm_mod mptscs$ Aug 22 04:03:15 wssproxy kernel: CPU: 0 Aug 22 04:03:15 wssproxy kernel: EIP: 0060:[<c0187833>] Not tainted VLI Aug 22 04:03:15 wssproxy kernel: EFLAGS: 00000283 (2.6.9-34.0.2.EL) Aug 22 04:03:15 wssproxy kernel: EIP is at iput+0x14/0x61 Aug 22 04:03:15 wssproxy kernel: eax: 00000000 ebx: d5b68bf4 ecx: d5b68c04 edx: d5b68c04 Aug 22 04:03:15 wssproxy kernel: esi: d5b68bf4 edi: 00000074 ebp: efeee9e0 esp: c17f5eec Aug 22 04:03:15 wssproxy kernel: ds: 007b es: 007b ss: 0068 Aug 22 04:03:15 wssproxy kernel: Process kswapd0 (pid: 28, threadinfo=c17f5000 task=c17de0b0) Aug 22 04:03:15 wssproxy kernel: Stack: dc8ba048 c0182a6d 00000000 000000d8 00000000 c01834b2 c0152e0b 0017ed00 Aug 22 04:03:15 wssproxy kernel: 00000000 000001fe 00000000 00000bff 000000d0 00000020 c0360ba0 00000000 Aug 22 04:03:15 wssproxy kernel: c0360ba0 00000000 c015444b c01131cc 00000bff c17f5f9c 0000000d 00000000 Aug 22 04:03:15 wssproxy kernel: Call Trace: Aug 22 04:03:15 wssproxy kernel: [<c0182a6d>] prune_dcache+0x2fe/0x49d Aug 22 04:03:15 wssproxy kernel: [<c01834b2>] shrink_dcache_memory+0x14/0x2b Aug 22 04:03:15 wssproxy kernel: [<c0152e0b>] shrink_slab+0xf7/0x14c Aug 22 04:03:15 wssproxy kernel: [<c015444b>] balance_pgdat+0x1b3/0x2cb Aug 22 04:03:15 wssproxy kernel: [<c01131cc>] sched_clock+0x30/0x73 Aug 22 04:03:15 wssproxy kernel: [<c015461c>] kswapd+0xb9/0xbb Aug 22 04:03:15 wssproxy kernel: [<c011e867>] autoremove_wake_function+0x0/0x2d Aug 22 04:03:15 wssproxy kernel: [<c031139a>] ret_from_fork+0x6/0x14 Aug 22 04:03:15 wssproxy kernel: [<c011e867>] autoremove_wake_function+0x0/0x2d Aug 22 04:03:15 wssproxy kernel: [<c0154563>] kswapd+0x0/0xbb Aug 22 04:03:15 wssproxy kernel: [<c01041dd>] kernel_thread_helper+0x5/0xb Aug 22 04:03:15 wssproxy kernel: Code: 5b 5e e9 18 de ff ff 83 78 24 00 75 05 e9 4e fb ff ff e9 72 fd ff ff 53 85 c0 89 c3 74 58 83 bb 9c 01 00 00 20 8b 80 d4 00 00 00 <8b>$ Aug 22 04:03:15 wssproxy kernel: <0>Fatal exception: panic in 5 seconds Aug 22 04:03:16 wssproxy kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000024 Aug 22 04:03:16 wssproxy kernel: printing eip: Aug 22 04:03:16 wssproxy kernel: c0187833 Aug 22 04:03:16 wssproxy kernel: *pde = 00000000 Aug 22 04:03:16 wssproxy kernel: Oops: 0000 [#2] Aug 22 04:03:16 wssproxy kernel: Modules linked in: md5 ipv6 autofs4 sunrpc button battery ac shpchp pcnet32 mii floppy dm_snapshot dm_zero dm_mirror ext3 jbd dm_mod mptscs$ Aug 22 04:03:16 wssproxy kernel: CPU: 0 Aug 22 04:03:16 wssproxy kernel: EIP: 0060:[<c0187833>] Not tainted VLI Aug 22 04:03:16 wssproxy kernel: EFLAGS: 00000283 (2.6.9-34.0.2.EL) Aug 22 04:03:16 wssproxy kernel: EIP is at iput+0x14/0x61 Aug 22 04:03:16 wssproxy kernel: eax: 00000000 ebx: d5b6868c ecx: d5b6869c edx: d5b6869c Aug 22 04:03:16 wssproxy kernel: esi: d5b6868c edi: 00000080 ebp: efeee9e0 esp: ccd32cf4 Aug 22 04:03:16 wssproxy kernel: ds: 007b es: 007b ss: 0068 Aug 22 04:03:16 wssproxy kernel: Process prelink (pid: 1580, threadinfo=ccd32000 task=c7e74c50) Aug 22 04:03:16 wssproxy kernel: Stack: dc8bad68 c0182a6d 00000000 00000080 00000000 c01834b2 c0152e0b 0017d400 Aug 22 04:03:16 wssproxy kernel: 00000000 00000008 00000000 0002b94a 000001d2 00000020 c0360fbc 000001d2 Aug 22 04:03:16 wssproxy kernel: 0000000b ccd32db0 c01541c8 0002b94a 00000000 00000000 00000000 00000020 Aug 22 04:03:16 wssproxy kernel: Call Trace: Aug 22 04:03:16 wssproxy kernel: [<c0182a6d>] prune_dcache+0x2fe/0x49d Aug 22 04:03:16 wssproxy kernel: [<c01834b2>] shrink_dcache_memory+0x14/0x2b Aug 22 04:03:16 wssproxy kernel: [<c0152e0b>] shrink_slab+0xf7/0x14c Aug 22 04:03:16 wssproxy kernel: [<c01541c8>] try_to_free_pages+0xb9/0x189 Aug 22 04:03:16 wssproxy kernel: [<c014c3aa>] __alloc_pages+0x1fe/0x2f7 Aug 22 04:03:16 wssproxy kernel: [<c014f250>] do_page_cache_readahead+0x14b/0x262 Aug 22 04:03:16 wssproxy kernel: [<c014f4cb>] page_cache_readahead+0x164/0x20a Aug 22 04:03:16 wssproxy kernel: [<c014872e>] do_generic_mapping_read+0x11c/0x403 Aug 22 04:03:16 wssproxy kernel: [<c0148c3e>] __generic_file_aio_read+0x160/0x17a Aug 22 04:03:16 wssproxy kernel: [<c0148a15>] file_read_actor+0x0/0xc9 Aug 22 04:03:16 wssproxy kernel: [<c0148c98>] generic_file_aio_read+0x40/0x47 Aug 22 04:03:16 wssproxy kernel: [<c0168a4a>] do_sync_read+0x97/0xc9 Aug 22 04:03:16 wssproxy kernel: [<c0179a94>] open_namei+0x2c5/0x542 Aug 22 04:03:16 wssproxy kernel: [<c0167c76>] filp_open+0x5c/0x70 Aug 22 04:03:16 wssproxy kernel: [<c011e867>] autoremove_wake_function+0x0/0x2d Aug 22 04:03:16 wssproxy kernel: [<c0168b32>] vfs_read+0xb6/0xe2 Aug 22 04:03:16 wssproxy kernel: [<c0168d45>] sys_read+0x3c/0x62 Aug 22 04:03:16 wssproxy kernel: [<c031147b>] syscall_call+0x7/0xb Aug 22 04:03:16 wssproxy kernel: Code: 5b 5e e9 18 de ff ff 83 78 24 00 75 05 e9 4e fb ff ff e9 72 fd ff ff 53 85 c0 89 c3 74 58 83 bb 9c 01 00 00 20 8b 80 d4 00 00 00 <8b>$ Aug 22 04:03:16 wssproxy kernel: <0>Fatal exception: panic in 5 seconds Aug 22 04:03:18 wssproxy ntpd[1937]: sendto(193.13.9.98): Bad file descriptor Cheers Andy Dean E-Mail Disclaimer: The information in this e-mail is confidential, and may be legally privileged. 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