While adding support for the iSCSI Transport class
(scsi_transport_iscsi.c) to the iscsi-initiator-core stack, I ran into a
problem with iscsi_release_transport() and
transport_container_unregister().
When iscsi_register_transport() and iscsi_release_transport() are called
WITHOUT calling scsi_add_host() and scsi_remove_host() there are no
problems.
When iscsi_register_transport() and iscsi_release_transport() are called
WITH calling scsi_add_host() and scsi_remove_host() the following OOPs
appears in attribute_container_unregister during the list_empty() loop.
I also noticed that that transport_container_[register,unregister]()
calls in iscsi_[register,release]_transport() where added around
2.6.12-rc1, but are not included in the scsi_transport_iscsi.c within
the 4.0.1.11.
Any ideas?
(gdb) list *(attribute_container_unregister+0x1c)
0x7c is in attribute_container_unregister (list.h:251).
246 /**
247 * list_empty - tests whether a list is empty
248 * @head: the list to test.
249 */
250 static inline int list_empty(const struct list_head *head)
251 {
252 return head->next == head;
253 }
254
255 /**
(gdb)
Unable to handle kernel paging request at virtual address 63722d5e
printing eip:
c029ed5c
*pde = 00000000
Oops: 0000 [#1]
SMP
Modules linked in: iscsi_initiator_mod scsi_transport_iscsi microcode
usbcore
CPU: 1
EIP: 0060:[<c029ed5c>] Not tainted VLI
EFLAGS: 00010246 (2.6.12-rc3)
EIP is at attribute_container_unregister+0x1c/0x50
eax: 63722d5e ebx: fffffff0 ecx: 63722d56 edx: 00000282
esi: 00000000 edi: bfaf3650 ebp: f6ed5f24 esp: f6ed5f20
ds: 007b es: 007b ss: 0068
Process rmmod (pid: 4501, threadinfo=f6ed5000 task=f7873530)
Stack: 63722d32 f6ed5f34 f886e043 63722d56 f8cf2680 f6ed5f4c f8cd0248
63722d32
00000008 f8cf2680 00000880 f6ed5f54 f8cde7d8 f6ed5fb4 c01381f7
f8cf2680
00000880 f6ed5f68 00000000 73637369 6e695f69 61697469 5f726f74
00646f6d
Call Trace:
[<c0103c9f>] show_stack+0x7f/0xa0
[<c0103e4e>] show_registers+0x15e/0x1d0
[<c0104062>] die+0xf2/0x180
[<c0113252>] do_page_fault+0x382/0x6e0
[<c01038a3>] error_code+0x4f/0x54
[<f886e043>] iscsi_release_transport+0x23/0x60 [scsi_transport_iscsi]
[<f8cd0248>] iscsi_linux_fini+0x18/0x80 [iscsi_initiator_mod]
[<f8cde7d8>] exit_iscsi_module+0x8/0xa [iscsi_initiator_mod]
[<c01381f7>] sys_delete_module+0x157/0x190
[<c0102d33>] sysenter_past_esp+0x54/0x75
--
Nicholas A. Bellinger <nick@xxxxxxxxxxxxxxxxxxx>
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