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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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