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SubjectRe: 2.6.19-rc5-mm2 (Oops in class_device_remove_attrs during nodemgr_remove_host)
> Time for me to let -mm loose on my PC.

Small progress:

- I get the oops already in nodemgr_remove_ne, unlike the original
report where it happened a little later in driver core functions
called by nodemgr_remove_ne.

- I get it only if eth1394 is loaded when I unload ohci1394.

- Like Mattia already found, this only happens on -mm, not on
2.6.19-rc plus patched ieee1394 code which is 100% the same as
in -mm except for Nigel Cunningham's
which is of course not involved.

EIP is at nodemgr_remove_ne+0x40/0x90 [ieee1394]
eax: 00000000 ebx: f6af0c68 ecx: c02fcc20 edx: 0000003a
esi: f6af0c2c edi: f8c14b60 ebp: f7395dd8 esp: f7395db8
ds: 007b es: 007b ss: 0068
Process modprobe (pid: 4568, ti=f7394000 task=f69c3530 task.ti=f7394000)
Stack: f6af0c68 00000000 00000020 0000003a f8de0e00 00000000 00000000
f7395dec f8c14b8e f6af0c2c f73c20c4 f6af0c9c f7395e18 c02228e2
f73c20c4 f73c20c4 f73c20e4 f6af0c98 c02b4698 f73c20c4 f73c2000
Call Trace:
[<c010400f>] show_trace_log_lvl+0x2f/0x50
[<c01040f7>] show_stack_log_lvl+0x97/0xc0
[<c0104355>] show_registers+0x1c5/0x340
[<c010469a>] die+0x12a/0x220
[<c0114649>] do_page_fault+0x369/0x660
[<c02b697c>] error_code+0x7c/0x84
[<f8c14b8e>] __nodemgr_remove_host_dev+0x2e/0x40 [ieee1394]
[<c02228e2>] device_for_each_child+0x32/0x60
[<f8c14bbe>] nodemgr_remove_host_dev+0x1e/0x90 [ieee1394]
[<f8c169f7>] nodemgr_remove_host+0x37/0x40 [ieee1394]
[<f8c111bc>] __unregister_host+0x8c/0xd0 [ieee1394]
[<f8c11b16>] highlevel_remove_host+0x36/0x60 [ieee1394]
[<f8c10c23>] hpsb_remove_host+0x43/0x70 [ieee1394]
[<f8c07e08>] ohci1394_pci_remove+0x68/0x240 [ohci1394]
[<c01f7f86>] pci_device_remove+0x46/0x50
[<c0224cae>] __device_release_driver+0xae/0xc0
[<c0224e38>] driver_detach+0x118/0x120
[<c0224174>] bus_remove_driver+0x44/0x70
[<c0225102>] driver_unregister+0x12/0x20
[<c01f8305>] pci_unregister_driver+0x15/0x30
[<f8c084d2>] ohci1394_cleanup+0x12/0x14 [ohci1394]
[<c0142aa6>] sys_delete_module+0x156/0x180
[<c01031f6>] sysenter_past_esp+0x5f/0x85
Code: c7 85 c0 89 c3 74 60 8b 06 8b 56 04 89 44 24 10 89 54 24 14 0f b7
46 14 89 c2 83 e0 3f c1 ea 06 89 44 24 08 89 54 24 0c 8b 46 10 <8b> 80
b8 00 00 00 c7 04 24 84 bc c1 f8 89 44 24 04 e8 7a 9c 50
EIP: [<f8c14b10>] nodemgr_remove_ne+0x40/0x90 [ieee1394] SS:ESP

In that way it is 100% reproducible here. I continue to debug this.
Stefan Richter
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