Re: sparsemem panic in 2.6.17-rc5-mm1 and -mm2

[Chuck Ebbert]

In-Reply-To: <4484D174.7080902@xxxxxxxxxx>

On Mon, 05 Jun 2006 17:51:00 -0700, Martin Bligh wrote:

> http://test.kernel.org/abat/34264/debug/console.log
> 
> Only seems to happen on the sparsemem runs. Possibly a side-effect
> of the page migration stuff, manifesting itself differently?
> Or maybe not?
> 
> Out of Memory: Kill process 1 (idle) score 0 and children.
> divide error: 0000 [#1]
> SMP
> last sysfs file:
> CPU:    0
> EIP:    0060:[<c013be6a>]    Not tainted VLI
> EFLAGS: 00010246   (2.6.17-rc5-mm2-autokern1 #1)
> EIP is at shrink_active_list+0x5b/0x382
> eax: 00000000   ebx: 00000064   ecx: 00000000   edx: 00000000
> esi: c0474500   edi: c03a8e64   ebp: c03a8dbc   esp: c03a8d9c
> ds: 007b   es: 007b   ss: 0068
> Process idle (pid: 1, threadinfo=c03a8000 task=c0769000)
> Stack: 00000000 00000000 00000020 00000004 c03a8dac c03a8dac c03a8db4 c03a8db4
>         c03a8dbc c03a8dbc c03a8dfc c0137a14 00000000 c0137a37 c03a8df8 c03a8df4
>         c0474000 00000000 00000000 c03a8e64 c0137c5a 00000000 00028028 000dc0e0
> Call Trace:
>   <c0137a14> get_writeback_state+0x30/0x35  <c0137a37> get_dirty_limits+0x1e/0xc4
>   <c0137c5a> throttle_vm_writeout+0x18/0x53  <c013c221> shrink_zone+0x90/0xc1
>   <c013c29f> shrink_zones+0x4d/0x5e  <c013c39d> try_to_free_pages+0xed/0x1a8
>   <c0136a91> __alloc_pages+0x16e/0x26a  <c014e6c9> kmem_getpages+0x5b/0xac
>   <c014f42c> cache_grow+0xb5/0x147  <c014f655> cache_alloc_refill+0x197/0x1d3
>   <c014fad0> kmem_cache_alloc+0x4f/0x5e  <c0276dd8> sk_alloc+0x15/0x63
>   <c02bb9e0> inet_create+0xfb/0x21a  <c027546d> __sock_create+0xc0/0xea
>   <c02754b0> sock_create_kern+0xb/0xe  <c03c413b> icmp_init+0x3a/0xc3
>   <c03c445c> inet_init+0x12b/0x174  <c03aa7f6> do_initcalls+0x53/0xe4
>   <c01320d8> register_irq_proc+0x6a/0x90  <c0180000> xlate_proc_name+0x87/0x90
>   <c0100349> init+0x41/0xdc  <c0100308> init+0x0/0xdc
>   <c01009d5> kernel_thread_helper+0x5/0xb
> Code: 04 24 00 00 00 00 8d 44 24 10 89 44 24 10 89 44 24 14 83 79 10 00 
> 74 38 8b 8a bc 01 00 00 6b 47 04 64 bb 64 00 00 00 31 d2 d3 fb <f7> 35 
> 0c 6f 45 c0 ba 02 00 00 00 89 d1 99 f7 f9 01 d8 03 47 18
> EIP: [<c013be6a>] shrink_active_list+0x5b/0x382 SS:ESP 0068:c03a8d9c


static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
                                struct scan_control *sc)
{
        unsigned long pgmoved;
        int pgdeactivate = 0;
        unsigned long pgscanned;
        LIST_HEAD(l_hold);      /* The pages which were snipped off */
        LIST_HEAD(l_inactive);  /* Pages to go onto the inactive_list */
        LIST_HEAD(l_active);    /* Pages to go onto the active_list */
        struct page *page;
        struct pagevec pvec;
        int reclaim_mapped = 0;

        if (sc->may_swap) {
                long mapped_ratio;
                long distress;
                long swap_tendency;

                /*
                 * `distress' is a measure of how much trouble we're having
                 * reclaiming pages.  0 -> no problems.  100 -> great trouble.
                 */
                distress = 100 >> zone->prev_priority;

                /*
                 * The point of this algorithm is to decide when to start
                 * reclaiming mapped memory instead of just pagecache.  Work out
                 * how much memory
                 * is mapped.
                 */
====>           mapped_ratio = (sc->nr_mapped * 100) / total_memory;


total_memory == 0 here

-- 
Chuck

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