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    SubjectRe: Oops in 2.2.15pre7

    Halvard Moe wrote:

    > Oleg> I do not know is somebody told you or not, but please
    > Oleg> retrieve backtrace too. Do that by makin sure "Call Trace:
    > Oleg> ..." starts from new line and rerun ksymoops. It seems you
    > Oleg> hitting SMP race somewhere. But it is hard to tell where it
    > Oleg> came from without backtrace, too.
    > No nobody has commented on the request at all. Anyway I did as you
    > proposed and put Call trace on a new line, the result is appended to
    > the end of the mail. I'm not an expert on interpreting this kind of
    > output but it seems to me that the tulip driver is involved (All four
    > of the machines have Kingston KNE100TX ethernet cards (Tulip chip) and
    > therefore uses the tulip driver).
    Nope, I think that tulip has nothing to do with that.
    Try patch at the end of this letter, it definitely should help you.

    ALAN: What do you think about backporting of locking on Fasync_list
    from 2.3 to 2.2, is that needed?

    > Should I repost with the Trace output or is this problem/solution
    > known? If I can avoid the problem by changin ethernet cards that's
    > totally acceptable to me.
    No need for both, as I CC: this to linux-kernel myself.

    > >>EIP: 80131dd8 <kill_fasync+c/44>
    > Trace: 80169be3 <tcp_write_space+4f/54>
    > Trace: 8015ccaf <sock_wfree+17/1c>
    > Trace: 8015d642 <__kfree_skb+36/a0>
    > Trace: a089260c <tulip_interrupt+1ec/61c>
    > Trace: 80173188 <raw_v4_lookup+20/70>
    > Trace: 8016580e <ip_local_deliver+16a/1b8>
    > Trace: 8010b5d2 <handle_IRQ_event+5a/8c>
    > Trace: 80110022 <do_level_ioapic_IRQ+62/a0>
    > Code: 80131dd8 <kill_fasync+c/44> 00000000 <_EIP>: <===
    > Code: 80131dd8 <kill_fasync+c/44> 0: 81 3b 01 46 00 00 cmpl $0x4601,(%ebx) <===
    > Code: 80131dde <kill_fasync+12/44> 6: 74 10 je 80131df0 <kill_fasync+24/44>
    > Code: 80131de0 <kill_fasync+14/44> 8: 68 a0 f0 1e 80 pushl $0x801ef0a0
    > Code: 80131de5 <kill_fasync+19/44> d: e8 32 43 fe ff call 8011611c <printk+0/184>
    > Code: 80131dea <kill_fasync+1e/44> 12: 83 c4 00 addl $0x0,%esp

    --- net/socket.c.orig Sat Feb 19 23:15:54 2000
    +++ net/socket.c Sat Feb 19 23:17:09 2000
    @@ -561,7 +561,8 @@
    /* fall through */
    case 0:
    - kill_fasync(sock->fasync_list, SIGIO);
    + if(sock->fasync_list != NULL)
    + kill_fasync(sock->fasync_list, SIGIO);
    return 0;

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