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    SubjectRe: rmmod ohci1394 -> BUG
    (quoting in full for linux1394-devel)

    Nicolas Turro wrote on 2007-01-30:
    > Setup :
    > 64 bit dual core Xeon bi-processor, Fedora kernels
    >
    > Bug :
    > Rmmoding ohci1394 produces ce following bug :
    >
    >
    > List corruption. prev->next should be ffff810138d46e40, but was ffffffff882b9000
    > ----------- [cut here ] --------- [please bite here ] ---------
    > Kernel BUG at include/linux/list.h:180
    > invalid opcode: 0000 [1] SMP
    > last sysfs file: /class/ieee1394_protocol/raw1394/dev
    > CPU 2
    > Modules linked in: parport_pc lp parport autofs4 rfcomm l2cap bluetooth sunrpc dm_mod video button battery acpi_mem
    > hotplug ac ipv6 ohci1394 ieee1394 uhci_hcd ehci_hcd hw_random i2c_i801 i2c_core snd_hda_intel snd_hda_codec snd_seq
    > _dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd soundc
    > ore snd_page_alloc tg3 mptsas mptscsih scsi_transport_sas mptbase ahci libata sd_mod scsi_mod
    > Pid: 3841, comm: rmmod Not tainted 2.6.17-1.2142_FC4smp #1
    > RIP: 0010:[<ffffffff88256f37>] <ffffffff88256f37>{:ieee1394:__delete_addr+35}

    I can't see how any of the lists which __delete_addr touches could get
    corrupted. My guess is that there is something unrelated corrupting the
    memory.

    > RSP: 0018:ffff81012c4e9d98 EFLAGS: 00010092
    > RAX: 0000000000000054 RBX: ffff810138d46e40 RCX: ffffffff805524b8
    > RDX: 0000000000000000 RSI: 0000000000000046 RDI: ffffffff805524a0
    > RBP: ffff81013931c000 R08: ffffffff805524b8 R09: 0000000000000001
    > R10: ffff81012c4e99f8 R11: 0000000000000002 R12: ffffffff882939c0
    > R13: 0000000000000282 R14: 0000000000000000 R15: 0000000000000880
    > FS: 00002aaaaaabe3c0(0000) GS:ffff81013b8d1d40(0000) knlGS:0000000000000000
    > CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    > CR2: 0000003a012928f0 CR3: 000000012c69e000 CR4: 00000000000006e0
    > Process rmmod (pid: 3841, threadinfo ffff81012c4e8000, task ffff8101356ae820)
    > Stack: ffffffff88293a18 ffff810138d46e10 ffff81013931c000 ffffffff88257049
    > ffffffff882939c0 ffff81013931c000 ffff81013931ebf0 ffff81013b632100
    > ffffffff882c4778 ffffffff882570ec
    > Call Trace: <ffffffff88257049>{:ieee1394:__unregister_host+71}
    > <ffffffff882570ec>{:ieee1394:highlevel_remove_host+62}
    > <ffffffff88256373>{:ieee1394:hpsb_remove_host+60} <ffffffff882be227>{:ohci1394:ohci1394_pci_remove+75}
    > <ffffffff8033f83f>{pci_device_remove+33} <ffffffff8039b45d>{__device_release_driver+120}
    > <ffffffff8039b80c>{driver_detach+202} <ffffffff8039ae6d>{bus_remove_driver+111}
    > <ffffffff8039ba8b>{driver_unregister+13} <ffffffff8033f724>{pci_unregister_driver+26}
    > <ffffffff802a403f>{sys_delete_module+406} <ffffffff80262485>{tracesys+209}
    >
    > Code: 0f 0b 68 98 fa 25 88 c2 b4 00 48 8b 03 48 8b 50 08 48 39 da
    > RIP <ffffffff88256f37>{:ieee1394:__delete_addr+35} RSP <ffff81012c4e9d98>
    > <3>BUG: sleeping function called from invalid context at include/linux/rwsem.h:43
    > in_atomic():0, irqs_disabled():1
    >
    > Call Trace: <ffffffff80299b11>{blocking_notifier_call_chain+31}
    > <ffffffff80215bb0>{do_exit+34} <ffffffff8027000a>{kernel_math_error+0}
    > <ffffffff80270485>{do_invalid_op+173} <ffffffff88256f37>{:ieee1394:__delete_addr+35}

    I don't know what that's supposed to tell us. There simply are no
    sleeping functions called from __delete_addr. Seems the kernel went off
    on a tangent here.

    > <ffffffff80278680>{__smp_call_function+98} <ffffffff802784cc>{do_flush_tlb_all+0}
    > <ffffffff80290415>{printk+84} <ffffffff802631e9>{error_exit+0}
    > <ffffffff88256f37>{:ieee1394:__delete_addr+35} <ffffffff88256f37>{:ieee1394:__delete_addr+35}
    > <ffffffff88257049>{:ieee1394:__unregister_host+71} <ffffffff882570ec>{:ieee1394:highlevel_remove_host+62}
    > <ffffffff88256373>{:ieee1394:hpsb_remove_host+60} <ffffffff882be227>{:ohci1394:ohci1394_pci_remove+75}
    > <ffffffff8033f83f>{pci_device_remove+33} <ffffffff8039b45d>{__device_release_driver+120}
    > <ffffffff8039b80c>{driver_detach+202} <ffffffff8039ae6d>{bus_remove_driver+111}
    > <ffffffff8039ba8b>{driver_unregister+13} <ffffffff8033f724>{pci_unregister_driver+26}
    > <ffffffff802a403f>{sys_delete_module+406} <ffffffff80262485>{tracesys+209}
    >
    >
    > Any idea ? (if any, please cc Nicolas.Turro@inrialpes.fr since i didn't subscribe to LKML)
    >
    > Nicolas
    >

    --
    Stefan Richter
    -=====-=-=== --=- ----=
    http://arcgraph.de/sr/
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