[openib-general] [OOPS] unloading ib_mthca with ib0 up

[Tom Duffy]

I probably shouldn't have done this, but I tried to unload ib_mthca with
ib_ipoib loaded and ib0 up.  Anyways, it caused an oops.

Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP:
<ffffffffa02b6ae2>{:ib_ipoib:ipoib_ib_dev_stop+66}
PML4 30d9b067 PGD 34b53067 PMD 0
Oops: 0000 [1] SMP
CPU 0
Modules linked in: ib_ipoib ib_sa_client ib_client_query ib_poll ib_mthca ib_mad
 ib_core ib_services nfs lockd md5 ipv6 parport_pc lp parport autofs4 rfcomm l2c
ap bluetooth ds yenta_socket pcmcia_core sunrpc tg3 floppy sg ext3 jbd dm_mod oh
ci_hcd button battery asus_acpi ac xfs mptscsih mptbase sd_mod scsi_mod
Pid: 22107, comm: rmmod Not tainted 2.6.9-rc2openib
RIP: 0010:[<ffffffffa02b6ae2>] <ffffffffa02b6ae2>{:ib_ipoib:ipoib_ib_dev_stop+66
}
RSP: 0018:0000010030e1dca8  EFLAGS: 00010256
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000015
RDX: 0000000000000000 RSI: 0000000000000216 RDI: 0000010031107000
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000002
R10: 00000100311070c8 R11: ffffffff8040b080 R12: 0000010031107380
R13: ffffffff804aa1c0 R14: 00000100097e5380 R15: 00000100097e5000
FS:  0000002a9557b4c0(0000) GS:ffffffff80473d80(0000) knlGS:0000000055579540
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 0000000000101000 CR4: 00000000000006e0
Process rmmod (pid: 22107, threadinfo 0000010030e1c000, task 000001007ee2e030)
Stack: 000001003fefb200 ffffffff802bc0fe 0000010031107380 0000010031107380
       0000010031107000 00000100097e5390 00000100097e5748 ffffffffa02b4311
       ffffffffa02be2aa 0000010031107000
Call Trace:<ffffffff802bc0fe>{skb_queue_purge+46} <ffffffffa02b4311>{:ib_ipoib:_
ipoib_dev_stop+113}
       <ffffffff802bf8c6>{dev_close+118} <ffffffff802c1dd5>{unregister_netdevice
+181}
       <ffffffff8025c2e1>{unregister_netdev+17} <ffffffffa02b4fb8>{:ib_ipoib:ipo
ib_dev_cleanup+88}
       <ffffffff802c1bda>{netdev_run_todo+298} <ffffffffa02b58cd>{:ib_ipoib:ipoi
b_remove_one+253}
       <ffffffffa025bdce>{:ib_core:ib_unregister_device+94}
       <ffffffffa028b32e>{:ib_mthca:mthca_remove_one+46} <ffffffff801f4c6c>{pci_
device_remove+44}
       <ffffffff8024bf5e>{device_release_driver+94} <ffffffff8024bfa9>{driver_de
tach+41}
       <ffffffff8024c3ea>{bus_remove_driver+42} <ffffffff8024c869>{driver_unregi
ster+9}
       <ffffffff801f4f0d>{pci_unregister_driver+13} <ffffffff80151f8b>{sys_delet
e_module+331}
       <ffffffff801122b5>{error_exit+0} <ffffffff8011191a>{system_call+126}


Code: 48 8b 3c 02 48 85 ff 0f 84 9a 00 00 00 65 48 8b 04 25 18 00
RIP <ffffffffa02b6ae2>{:ib_ipoib:ipoib_ib_dev_stop+66} RSP <0000010030e1dca8>
CR2: 0000000000000000

Message from syslogd at sins-stinger-10 at Wed Sep 15 17:57:55 2004 ...
sins-stinger-10 kernel: Oops: 0000 [1] SMP

Message from syslogd at sins-stinger-10 at Wed Sep 15 17:57:55 2004 ...
sins-stinger-10 kernel: CR2: 0000000000000000

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