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Date: Sun, 28 Sep 2008 16:25:56 +0200
From: Philippe Gerum <rpm@xenomai.org>
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Subject: Re: [Xenomai-core] rt_sem_create bug when registring in proc
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To: stephane ancelot <sancelot@domain.hid>
Cc: "xenomai@xenomai.org" <xenomai@xenomai.org>

stephane ancelot wrote:
> Hi,
> I have the following kernel bug, when using a string name in  
> rt_sem_create. using NULL as name do not report this problem.
> 
> BUG: unable to handle kernel paging request at virtual address de82a268
> printing eip: c025d51a *pde = 1dd3e067 *pte = 00000000
> Oops: 0000 [#1] PREEMPT
> Modules linked in: xxxxxx(P) elok_s(P) e100 mii
>

You did not specify the Xenomai version in use. Looking at this output, you may
want to search the bug in your proprietary module code first; it seems that you
passed a string laid into the data segment of a module that has been unloaded,
without removing the semaphore it had initially created.

> Pid: 4, comm: events/0 Tainted: P        (2.6.24.2-ipipe #3)
> EIP: 0060:[<c025d51a>] EFLAGS: 00010246 CPU: 0
> EIP is at strlen+0xa/0x20
> EAX: 00000000 EBX: 00008124 ECX: ffffffff EDX: de82a268
> ESI: de82a268 EDI: de82a268 EBP: 00000001 ESP: ddc27e8c
>   DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
> Process events/0 (pid: 4, ti=ddc26000 task=ddc19ab0 task.ti=ddc26000)<0>
> I-pipe domain Linux
> Stack: ddc27ebc c01e445b dde783c0 c0257d2a dde78140 de82a268 de82a268  
> c016e7a0
>         c048aebc 00000000 c01e46d4 00000001 dde78140 c04fbac4 c016338c  
> 00000200
>         00000000 ffffffff ffffffff 0000007b 00000002 00000000 dde783c0  
> dde78140
> Call Trace:
>   [<c01e445b>] proc_create+0x4b/0x110
>   [<c0257d2a>] idr_get_new+0xa/0x30
>   [<c016e7a0>] __sem_read_proc+0x0/0x130
>   [<c01e46d4>] create_proc_entry+0x44/0x90
>   [<c016338c>] registry_proc_callback+0xa1c/0xb00
>   [<c01130c1>] update_curr+0x71/0x100
>   [<c0113148>] update_curr+0xf8/0x100
>   [<c01132ef>] set_next_entity+0x1f/0x50
>   [<c0162970>] registry_proc_callback+0x0/0xb00
>   [<c0129516>] run_workqueue+0xb6/0x1a0
>   [<c039ff8f>] schedule+0x1df/0x3d0
>   [<c0129e9d>] worker_thread+0x6d/0xa0
>   [<c012d670>] autoremove_wake_function+0x0/0x50
>   [<c0129e30>] worker_thread+0x0/0xa0
>   [<c012d302>] kthread+0x42/0x70
>   [<c012d2c0>] kthread+0x0/0x70
>   [<c010398b>] kernel_thread_helper+0x7/0x1c
>   =======================
> Code: 00 56 89 c6 89 d0 88 c4 ac 38 e0 74 09 84 c0 75 f7 be 01 00 00 00 89  
> f0 48 5e c3 8d b6 00 00 00 00 57 b9 ff ff ff ff 89 c7 31 c0 <f2> ae f7 d1  
> 49 5f 89 c8 c3 8d b6 00 00 00 00 8d bc 27 00 00 00
> EIP: [<c025d51a>] strlen+0xa/0x20 SS:ESP 0068:ddc27e8c
> ---[ end trace 614a6309c2874abe ]---
> 
> Best regards
> S.Ancelot
> 
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> 


-- 
Philippe.