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From jrb <j...@paisvirtual.com>
Subject os-linux/6843: kernel error on proccess httpd
Date Tue, 14 Nov 2000 18:11:29 GMT

>Number:         6843
>Category:       os-linux
>Synopsis:       kernel error on proccess httpd
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    apache
>State:          open
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Tue Nov 14 10:20:00 PST 2000
>Originator:     jrbe@paisvirtual.com
>Release:        1.3.11 (Unix)
Red Hat Linux 6.2
Linux 2.2.14-5.0smp #1 SMP Tue Mar 7 21:01:40 EST 2000 i686 unknown

Compiler: egcs-2.91.66
Httpd Server: Apache/1.3.11 (Unix)

The output of my syslog daemon was:

kernel: Unable to handle kernel NULL pointer dereference at virtual address 000
kernel: current->tss.cr3 = 26364000, %cr3 = 26364000
kernel: *pde = 00000000
kernel: Oops: 0000
kernel: CPU:	0
kernel: EIP:    0010:[tcp_v4_unhash+120/171]
kernel: EFLAGS: 00010286
kernel: eax: e2cc8f48   ebx: d8301400   ecx: 00000000 edx: d8758e60
kernel: esi: d8301400   edi: f7e9cec0   ebp: e1455f6c esp: e2467ec8
kernel: ds: 0018   es: 0018   ss: 0018
kernel: Process httpd (pid: 8573, process nr: 861, stackpage=e2467000)
kernel: Stack: d8301400 ffffff8f c6ee5980 c01747b1 d8301400 e1455f6c db5b4b3c e
kernel:        e2466000 c014f34e db5b4b3c e1455f6c 00000002 00000004 4000ae60 b
kernel:        bffff988 00000013 00000000 c010b508 00000012 f9d2d000 e2467f68 0
kernel: Call Trace: [inet_accept+209/242] [sys_accept+144/350] [handle_IRQ_even
                    [do_level_ioapic_IRQ+143/161] [do_IRQ+59/89]
                    [sys_rt_sigaction+127/211] [sys_rt_sigprocmask+83/434]
                    [sys_socketcall+162/440] [system_call+52/56]
kernel: Code: 83 79 08 00 75 24 8b 51 04 85 d2 74 09 8b 41 0c 89 42 0c 8b

i have no core dumped!
i think a system network call made by httpd process is the source of the problem or
maybe my linux box is managing too much tcp connections!
i don't know
i think the source of the problem is the kernel TCP/IP stack, but 
i don't know how to fix it. Could you give me some advise? Thanks.
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