That shouldn't happen. Did you deregister the user when you removed the
module?
Actually, that doesn't seem to be it:
[<ffffffff8169b32e>] ? do_page_fault+0x3e/0xa0
[<ffffffff816986b5>] ? page_fault+0x25/0x30
[<ffffffff81356abc>] ? misc_register+0x4c/0x170
[<ffffffff81356a97>] ? misc_register+0x27/0x170
[<ffffffffa00b4354>] ? sce_new_smi+0x74/0x10c [ipmi_sce_logger]
[<ffffffffa006f4a1>] ? ipmi_smi_watcher_register+0x121/0x240
[ipmi_msghandler]
[<ffffffff8169b3e5>] ? notifier_call_chain+0x55/0x80
[<ffffffffa00b8000>] ? ipmi_sce_init+0x0/0x3f [ipmi_sce_logger]
Notice it calls your sce_new_smi code, which calls misc_register, which
fails. I suspect you didn't remove the misc device registration when
you removed the module.
-corey
On 11/11/2013 06:04 PM, David Bashaw wrote:
> Hello all.
>
> I have been developing a kernel module to log OEM SEL entries.
> I noticed the following problem:
>
> # insmod ipmi_sce_logger.ko
> IPMI sce error logger: sce user created
> IPMI sce error logger: driver initialized
>
> Now rmmod
>
> # rmmod ipmi_sce_logger
> IPMI sce error logger: ipmi_sce_exit
> #
>
> So far so good. Now insmod a second time.
>
> # insmod ipmi_sce_logger.ko
> BUG: unable to handle kernel paging request at 0000001e13e80000
> IP: [<ffffffff81356abc>] misc_register+0x4c/0x170
> PGD 42f00a067 PUD 0
> Oops: 0000 [#1] SMP
> last sysfs file:
> /sys/devices/pci0000:00/0000:00:0c.0/0000:02:00.0/host0/port-0:0/expander-0:0/phy-0:0:20/sas_phy/phy-0:0:20/phy_identifier
> CPU 1
> Pid: 12131, comm: insmod Not tainted 2.6.32 #1 empty
> RIP: 0010:[<ffffffff81356abc>] [<ffffffff81356abc>]
> misc_register+0x4c/0x170
> RSP: 0018:ffff88042c7b3e78 EFLAGS: 00010283
> RAX: 0000001e13e7ffe8 RBX: ffffffffa00b4980 RCX: 0000001e13e80000
> RDX: 0000000000000095 RSI: ffffffffa00ad998 RDI: ffffffff81cf1ae0
> RBP: ffff88042c7b3e88 R08: 00000000000000d0 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000003 R12: ffffffffa00b4998
> R13: ffff88042c7b3eb8 R14: ffffffffa00b4940 R15: ffff880437c00040
> FS: 00007ffb34b37700(0000) GS:ffff880028240000(0000)
> knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000001e13e80000 CR3: 000000042e423000 CR4: 00000000000006e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process insmod (pid: 12131, threadinfo ffff88042c7b2000, task
> ffff8804327baab0)
> Stack:
> ffff88042f8ba440 ffff88042c7b3ea8 ffff88042c7b3e98 ffffffffa00b4354
> <0> ffff88042c7b3ef8 ffffffffa006f4a1 ffff88042c7b3ee8 ffffffff8169b3e5
> <0> ffff88042c7b3eb8 ffff88042c7b3eb8 ffffffff81ca1bc0 0000000000000000
> Call Trace:
> [<ffffffffa00b4354>] sce_new_smi+0x74/0x10c [ipmi_sce_logger]
> [<ffffffffa006f4a1>] ipmi_smi_watcher_register+0x121/0x240
> [ipmi_msghandler]
> [<ffffffff8169b3e5>] ? notifier_call_chain+0x55/0x80
> [<ffffffffa00b8000>] ? ipmi_sce_init+0x0/0x3f [ipmi_sce_logger]
> [<ffffffffa00b8015>] ipmi_sce_init+0x15/0x3f [ipmi_sce_logger]
> [<ffffffff8100204c>] do_one_initcall+0x3c/0x1d0
> [<ffffffff810a44cf>] sys_init_module+0xdf/0x250
> [<ffffffff8100b132>] system_call_fastpath+0x16/0x1b
> Code: 81 e8 f9 02 34 00 48 8b 05 62 b0 99 00 8b 13 48 83 e8 18 eb 16
> 66 2e 0f 1f 84 00 00 00 00 00 39 10 0f 84 98 00 00 00 48 8d 41 e8 <48>
> 8b 48 18 48 8d 70 18 48 81 fe 00 1b cf 81 0f 18 09 75 e0 81
> RIP [<ffffffff81356abc>] misc_register+0x4c/0x170
> RSP <ffff88042c7b3e78>
> CR2: 0000001e13e80000
> ---[ end trace 9c1825899c25a062 ]---
> Kernel panic - not syncing: Fatal exception
> Pid: 12131, comm: insmod Tainted: G D ---------------- 2.6.32 #1
> Call Trace:
> [<ffffffff81695279>] ? panic+0x7d/0x148
> [<ffffffff81699344>] ? oops_end+0xe4/0x100
> [<ffffffff8103b48b>] ? no_context+0xfb/0x260
> [<ffffffff8103b715>] ? __bad_area_nosemaphore+0x125/0x1e0
> [<ffffffff811c35b0>] ? sysfs_ilookup_test+0x0/0x20
> [<ffffffff8103b83e>] ? bad_area+0x4e/0x60
> [<ffffffff8103bf63>] ? __do_page_fault+0x3c3/0x480
> [<ffffffff812d8f20>] ? idr_get_empty_slot+0x110/0x2c0
> [<ffffffff812d9180>] ? ida_get_new_above+0xb0/0x210
> [<ffffffff811c35b0>] ? sysfs_ilookup_test+0x0/0x20
> [<ffffffff8169b32e>] ? do_page_fault+0x3e/0xa0
> [<ffffffff816986b5>] ? page_fault+0x25/0x30
> [<ffffffff81356abc>] ? misc_register+0x4c/0x170
> [<ffffffff81356a97>] ? misc_register+0x27/0x170
> [<ffffffffa00b4354>] ? sce_new_smi+0x74/0x10c [ipmi_sce_logger]
> [<ffffffffa006f4a1>] ? ipmi_smi_watcher_register+0x121/0x240
> [ipmi_msghandler]
> [<ffffffff8169b3e5>] ? notifier_call_chain+0x55/0x80
> [<ffffffffa00b8000>] ? ipmi_sce_init+0x0/0x3f [ipmi_sce_logger]
> [<ffffffffa00b8015>] ? ipmi_sce_init+0x15/0x3f [ipmi_sce_logger]
> [<ffffffff8100204c>] ? do_one_initcall+0x3c/0x1d0
> [<ffffffff810a44cf>] ? sys_init_module+0xdf/0x250
> [<ffffffff8100b132>] ? system_call_fastpath+0x16/0x1b
>
> My smi de-register was not invoked so the next insmod caused mushroom
> cloud.
>
> Is this to be expected?
> Is there a way to fix this I don't know about?
>
> Dave
>
>
>
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