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    SubjectRe: [RFC] linux-2.6.22-rc2. SLUB report[kzalloc(0)]
    Dan Kruchinin napsal(a):
    > Hi.
    >
    > There is a BUG message from SLUB during boot process:
    > --
    > May 21 05:39:10 midgard kernel: [ 31.177484] BUG: at
    > include/linux/slub_def.h:77 kmalloc_index()
    > May 21 05:39:10 midgard kernel: [ 31.178355] [<c01062ca>]
    > show_trace_log_lvl+0x1a/0x30
    > May 21 05:39:10 midgard kernel: [ 31.179263] [<c0106e72>] show_trace
    > +0x12/0x20
    > May 21 05:39:10 midgard kernel: [ 31.180177] [<c0106ee6>] dump_stack
    > +0x16/0x20
    > May 21 05:39:10 midgard kernel: [ 31.181094] [<c018440d>] get_slab
    > +0x1cd/0x260
    > May 21 05:39:10 midgard kernel: [ 31.182024] [<c0185809>]
    > __kmalloc_track_caller+0x19/0xa0
    > May 21 05:39:10 midgard kernel: [ 31.183019] [<c0170059>] __kzalloc
    > +0x19/0x50
    > May 21 05:39:10 midgard kernel: [ 31.184012] [<df05586e>]
    > usb_get_configuration+0x9de/0x11c0 [usbcore]
    > May 21 05:39:10 midgard kernel: [ 31.185115] [<df04cd07>]
    > usb_new_device+0x17/0x190 [usbcore]
    > May 21 05:39:10 midgard kernel: [ 31.186181] [<df04e68a>] hub_thread
    > +0x79a/0xfd0 [usbcore]
    > May 21 05:39:10 midgard kernel: [ 31.187185] [<c013b8e2>] kthread
    > +0x42/0x70
    > May 21 05:39:10 midgard kernel: [ 31.188190] [<c0105ea7>]
    > kernel_thread_helper+0x7/0x10
    > --
    >
    > kzalloc(0, GFP_KERNEL) occurs in drivers/usb/core/config.c in
    > usb_get_configuration function. I already wrote about this slub bug
    > report and offered a
    > patch(http://www.uwsg.iu.edu/hypermail/linux/kernel/0705.1/0154.html). I
    > don't know, may be it is not major thing, if it is, just ignore it. I
    > just think, that
    > --
    > length = ncfg * sizeof(struct usb_host_config);
    > dev->config = kzalloc(length, GFP_KERNEL);
    > --
    > isn't clear, because ncfg - in my case - is 0 and I suppose, that size
    > of the leastest slab cache can become(in future) smaller than
    > sizeof(struct usb_host_config).

    There is yet another patch for this:
    http://lkml.org/lkml/2007/5/19/171
    sitting here:
    http://kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/gregkh-03-usb/usb-don-t-try-to-kzalloc-0-bytes.patch

    regards,
    --
    http://www.fi.muni.cz/~xslaby/ Jiri Slaby
    faculty of informatics, masaryk university, brno, cz
    e-mail: jirislaby gmail com, gpg pubkey fingerprint:
    B674 9967 0407 CE62 ACC8 22A0 32CC 55C3 39D4 7A7E
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