Re: Hard Hang with __alloc_pages: 0-order allocation failed (gfp=0x20/1) - Not out of memory

From: Doug Dumitru (doug_at_easyco.com)
Date: 05/24/04

  • Next message: Daniel Pittman: "Re: Linux Kernel 2.6.6 IDE shutdown problems." 
    Date:	Sun, 23 May 2004 20:08:38 -0700
To: linux-kernel@vger.kernel.org

    I pulled some more information (if I did it correctly) from the first stack dump from the first
    __alloc_pages error log.

    ksymoops 2.4.4 on i686 2.4.25. Options used
          -V (default)
          -k ksyms.5 (specified)
          -l /proc/modules (default)
          -o /lib/modules/2.4.26/ (specified)
          -m /boot/System.map-2.4.26 (specified)

    Warning (expand_objects): object /lib/modules/2.4.26/kernel/drivers/md/lvm-mod.o for module lvm-mod
    has changed since load
    Warning (expand_objects): object /lib/modules/2.4.26/kernel/drivers/md/md.o for module md has
    changed since load
    cc68bad8 c0135289 00000000 011410ac 00000001 0000000c c03689dc 0000 cbccb780 cbccb780 c02d23ba c7c5b838
    Call Trace: [<c0135289>] [<c01352b0>] [<c0132214>] [<c02d23ba>] [<c01327f1>]
       [<c029923f>] [<c01f0d3c>] [<c01f0c52>] [<c0121786>] [<c01219d9>] [<c01f05ec>]
       [<c010a4de>] [<c010a6f4>] [<c0133ce6>] [<c0134152>] [<c01341fc>] [<c0134271>]
       [<c0134dff>] [<c0135169>] [<c01352b0>] [<c014c203>] [<c02b765e>] [<c029634f>]
       [<c014c467>] [<c014c8e9>] [<c010a72d>] [<c0108b63>]
    Warning (Oops_read): Code line not seen, dumping what data is available

    Trace; c0135289 <__alloc_pages+2d9/2f0>
    Trace; c01352b0 <__get_free_pages+10/20>
    Trace; c0132214 <kmem_cache_grow+c4/250>
    Trace; c02d23ba <arp_process+48a/4a0>
    Trace; c01327f1 <kmalloc+151/180>
    Trace; c029923f <alloc_skb+ef/1c0>
    Trace; c01f0d3c <e1000_alloc_rx_buffers+dc/110>
    Trace; c01f0c52 <e1000_clean_rx_irq+402/410>
    Trace; c0121786 <update_wall_time+16/50>
    Trace; c01219d9 <timer_bh+39/3f0>
    Trace; c01f05ec <e1000_intr+8c/e0>
    Trace; c010a4de <handle_IRQ_event+5e/90>
    Trace; c010a6f4 <do_IRQ+a4/f0>
    Trace; c0133ce6 <shrink_cache+a6/420>
    Trace; c0134152 <refill_inactive+f2/160>
    Trace; c01341fc <shrink_caches+3c/50>
    Trace; c0134271 <try_to_free_pages_zone+61/e0>
    Trace; c0134dff <balance_classzone+4f/200>
    Trace; c0135169 <__alloc_pages+1b9/2f0>
    Trace; c01352b0 <__get_free_pages+10/20>
    Trace; c014c203 <__pollwait+33/90>
    Trace; c02b765e <tcp_poll+2e/150>
    Trace; c029634f <sock_poll+1f/30>
    Trace; c014c467 <do_select+127/240>
    Trace; c014c8e9 <sys_select+339/480>
    Trace; c010a72d <do_IRQ+dd/f0>
    Trace; c0108b63 <system_call+33/38>

    If I am reading this correctly, the system was ...

       in an interrupt
       processing some TCP select(...) stuff
       asking for a page
       doing a zone rebalance
       trying to shrink cache
         and interrupted again
         by the ethernet driver
         which wanted to allocate an skb
         which wanted a page

    Thus __alloc_pages appears to be called recursively, with the 2nd call during a rebalance in the
    first one and both calls non-interuptable (on interrupts). Is this allowable?

    --------------------------------------------------------------------
    Doug Dumitru 800-470-2756 (610-237-2000)
    EasyCo LLC doug@easyco.com http://easyco.com
    --------------------------------------------------------------------

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  • Next message: Daniel Pittman: "Re: Linux Kernel 2.6.6 IDE shutdown problems."

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