linux-kernel - Re: [BUG] 2.6.23-rc3-mm1 Kernel panic - not syncing: Can't create pid

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Date:	Thu, 23 Aug 2007 14:42:27 +0530
From:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Pavel Emelyanov <xemul@...nvz.org>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Alexey Dobriyan <adobriyan@...nvz.org>
Subject: Re: [BUG] 2.6.23-rc3-mm1 Kernel panic - not syncing: Can't create
 pid_1 cachep

Kamalesh Babulal wrote:
> Pavel Emelyanov wrote:
>> Kamalesh Babulal wrote:
>>
>> The creation of this cache consists of allocating ~30
>> bytes and creating a new kmem cache. This looks strange
>> that one of these allocation falied...
>>
>> Could you please check what has happened with this patch:
>>
>> diff --git a/kernel/pid.c b/kernel/pid.c
>> index d267775..9d594eb 100644
>> --- a/kernel/pid.c
>> +++ b/kernel/pid.c
>> @@ -458,15 +458,22 @@ static struct kmem_cache *create_pid_cac
>>             goto out;
>>
>>     pcache = kmalloc(sizeof(struct pid_cache), GFP_KERNEL);
>> -    if (pcache == NULL)
>> +    if (pcache == NULL) {
>> +        printk("Can't alloc pcache size %d\n",
>> +                sizeof(struct pid_cache));
>>         goto err_alloc;
>> +    }
>>
>>     snprintf(pcache->name, sizeof(pcache->name), "pid_%d", nr_ids);
>>     cachep = kmem_cache_create(pcache->name,
>>             sizeof(struct pid) + (nr_ids - 1) * sizeof(struct upid),
>>             0, SLAB_HWCACHE_ALIGN, NULL);
>> -    if (cachep == NULL)
>> +    if (cachep == NULL) {
>> +        printk("Can't create cachep size %d\n",
>> +                sizeof(struct pid) +
>> +                (nr_ids - 1) * sizeof(struct upid));
>>         goto err_cachep;
>> +    }
>>
>>     pcache->nr_ids = nr_ids;
>>     pcache->cachep = cachep;
>>
>>
>>
>>> Hi Andrew,
>>>
>>> Following Kernel panic is raised while booting up with 
>>> 2.6.23-rc3-mm1 kernel.
>>>
>>> ============================================================
>>> Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
>>> Initializing HighMem for node 0 (00038000:001fbe00)
>>> Initializing HighMem for node 1 (00200000:003fbe00)
>>> Initializing HighMem for node 2 (00400000:005fbe00)
>>> Initializing HighMem for node 3 (00600000:007fbe00)
>>> Memory: 32480436k/33554432k available (2146k kernel code, 278984k 
>>> reserved, 1203k data, 216k init, 31842304k highmem)
>>> virtual kernel memory layout:
>>>    fixmap  : 0xffe1a000 - 0xfffff000   (1940 kB)
>>>    pkmap   : 0xffc00000 - 0xffe00000   (2048 kB)
>>>    vmalloc : 0xf8800000 - 0xffbfe000   ( 115 MB)
>>>    lowmem  : 0xc0000000 - 0xf8000000   ( 896 MB)
>>>      .init : 0xc134c000 - 0xc1382000   ( 216 kB)
>>>      .data : 0xc12189e1 - 0xc1345758   (1203 kB)
>>>      .text : 0xc1000000 - 0xc12189e1   (2146 kB)
>>> Checking if this processor honours the WP bit even in supervisor 
>>> mode... Ok.
>>> SLUB: Genslabs=12, HWalign=32, Order=0-3, MinObjects=16, CPUs=16, 
>>> Nodes=16
>>> Calibrating delay using timer specific routine.. 1401.55 BogoMIPS 
>>> (lpj=2803105)
>>> Kernel panic - not syncing: Can't create pid_1 cachep
>>>
>>>
>>> Thanks & Regards,
>>> Kamalesh Babulal.
> after applying the patch, kernel panic looks like this
> =============================================================================== 
>
> Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
> Initializing HighMem for node 0 (00038000:001fbe00)
> Initializing HighMem for node 1 (00200000:003fbe00)
> Initializing HighMem for node 2 (00400000:005fbe00)
> Initializing HighMem for node 3 (00600000:007fbe00)
> Memory: 32479372k/33554432k available (2635k kernel code, 280048k 
> reserved, 1282k data, 216k init, 31842304k highmem)
> virtual kernel memory layout:
>    fixmap  : 0xffe1a000 - 0xfffff000   (1940 kB)
>    pkmap   : 0xffc00000 - 0xffe00000   (2048 kB)
>    vmalloc : 0xf8800000 - 0xffbfe000   ( 115 MB)
>    lowmem  : 0xc0000000 - 0xf8000000   ( 896 MB)
>      .init : 0xc13da000 - 0xc1410000   ( 216 kB)
>      .data : 0xc1292f51 - 0xc13d3758   (1282 kB)
>      .text : 0xc1000000 - 0xc1292f51   (2635 kB)
> Checking if this processor honours the WP bit even in supervisor 
> mode... Ok.
> SLUB: Genslabs=12, HWalign=32, Order=0-3, MinObjects=16, CPUs=16, 
> Nodes=16
> Calibrating delay using timer specific routine.. 1401.55 BogoMIPS 
> (lpj=2803109)
> Can't alloc pcache size 32
> Kernel panic - not syncing: Can't create pid_1 cachep
>

    That's stupid.  Could be a startup ordering problem, but I can't spot it.

    Please try setting CONFIG_SLUB=n, CONFIG_SLAB=y and then retest, thanks.

Andrew after setting CONFIG_SLUB=n and CONFIG_SLAB, it hits
a kernel Bug, and attaching the config file.

Memory: 32479392k/33554432k available (2627k kernel code, 280028k 
reserved, 1274k data, 220k init, 31842304k highmem)
virtual kernel memory layout:
    fixmap  : 0xffe1a000 - 0xfffff000   (1940 kB)
    pkmap   : 0xffc00000 - 0xffe00000   (2048 kB)
    vmalloc : 0xf8800000 - 0xffbfe000   ( 115 MB)
    lowmem  : 0xc0000000 - 0xf8000000   ( 896 MB)
      .init : 0xc13d6000 - 0xc140d000   ( 220 kB)
      .data : 0xc1290e65 - 0xc13cf758   (1274 kB)
      .text : 0xc1000000 - 0xc1290e65   (2627 kB)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Calibrating delay using timer specific routine.. 1401.57 BogoMIPS 
(lpj=2803147)
------------[ cut here ]------------
kernel BUG at mm/slab.c:3320!
invalid opcode: 0000 [#1] SMP
kernel BUG at mm/slab.c:3320!
invalid op
Modules linked in:

Pid: 0, comm: swapper Not tainted (2.6.23-rc3-mm1-autokern1 #1)
EIP: 0060:[<c10579c0>] EFLAGS: 00010046 CPU: 0
EIP is at ____cache_alloc_node+0x19/0xdd
EAX: c1c00060 EBX: 00000003 ECX: 00000001 EDX: 000000d0
ESI: 00000000 EDI: c1c00060 EBP: 00000001 ESP: c13d1f88
 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
Process swapper (pid: 0, ti=c13d0000 task=c1350a60 task.ti=c13d0000)
Stack: 00000246 000000d0 00000003 000000d0 00000246 c1c00060 c1057c4b 
00000003
       00099800 c1354bac 01c86007 c1028726 00000000 000080d0 00000282 
c1c03620
       00000001 00000003 00099800 c13c4000 01c86007 c13e77d3 c13d1fd0 
c13d1fd0
Call Trace:
 [<c1057c4b>] kmem_cache_alloc+0x21/0xaa
 [<c1028726>] create_pid_cachep+0x59/0x123
 [<c13e77d3>] pidmap_init+0x2c/0x6c
 [<c13d699a>] start_kernel+0x1b4/0x208
 [<c13d63f7>] unknown_bootoption+0x0/0x139
 =======================
Code: 89 c7 0f 84 1e ff ff ff 89 f8 83 c4 0c 5b 5e 5f 5d c3 55 89 cd 57 
56 53 57 57 89 c7 89 54 24 04 8b b4 88 c8 00 00 00 85 f6 75 04 <0f> 0b 
eb fe 8d 46 24 e8 43 85 23 00 8b 1e 39 f3 75 11 c7 46 34
EIP: [<c10579c0>] ____cache_alloc_node+0x19/0xdd SS:ESP 0068:c13d1f88
Kernel panic - not syncing: Attempted to kill the idle task!



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