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    SubjectRe: IPMI hangup in 2.6.6-rc3
    Hi Holger, Corey, LKML!

    On Tue, May 04, 2004 at 07:05:12AM +0200, Holger Kiehl wrote:
    > When compiling in IPMI (not as modules) my system hangs just after
    > it prints out detection of IPMI. 2.6.5 did work fine. Compiling
    > it as a module and inserting it with modprobe causes modprobe
    > to hang in D state, there is nothing unusual in /var/log/messages:
    > May 4 08:46:34 apollo kernel: ipmi message handler version v31
    > May 4 08:46:34 apollo kernel: IPMI System Interface driver version v31, KCS version v31, SMIC version v31, BT version v31
    > May 4 08:46:34 apollo kernel: ipmi_si: Found SMBIOS-specified state machine at I/O address 0xca2
    > May 4 08:54:14 apollo kernel: ipmi device interface version v31

    Same for me on one of our single Xeon with 2.6.7-rc1. Using SysRq-T I
    was able to track it somehow down to the following situation:

    modprobe D C201AD20 0 3735 2415 (NOTLB)
    f6b51f0c 00000082 00000000 c201ad20 c201a0a0 00008124 00000002 00000000
    f7c03000 f6b51ee4 f8bda434 c04b5dc0 c201ad20 00000000 00000000 8ce9c0c0
    000f431a c03b8d80 f75fccd0 f75fce80 00000246 00000003 f6b50000 f7c03000
    Call Trace:
    [<f8bdb46d>] ipmi_register_smi+0x22a/0x386 [ipmi_msghandler]
    [<f8b570a6>] init_one_smi+0x1e6/0x4c2 [ipmi_si]
    [<f8b270c2>] init_ipmi_si+0xc2/0x203 [ipmi_si]
    [<c0137910>] sys_init_module+0x116/0x24d
    [<c0106053>] syscall_call+0x7/0xb

    modprobe hangs at linux-2.6.7-rc1/drivers/char/ipmi/ipmi_msghandler.c:1727
    wait_event((*intf)->waitq, ((*intf)->curr_channel>=IPMI_MAX_CHANNELS));

    This event should be fired by channel_handler(), but isn't for some
    unknown reason. I verified this by adding some printk() there, which
    wheren't shown.

    When I tried a 2.4 kernel with the patches from, I
    was somehow able to use IPMI, but got into problems later.

    Any idea, what I can do to track the problem further down?

    / / (_)__ __ ____ __ Philipp Hahn
    / /__/ / _ \/ // /\ \/ /
    /____/_/_//_/\_,_/ /_/\_\
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