Re: [BUG 2.6.24-rc3-git6] SLUB's ksize() fails for size > 2048.

[Mark Lord <lkml@rtr.ca>]

Mark Lord wrote:
> Tetsuo Handa wrote:
> > Hello.
> >
> > I can't pass memory allocated by kmalloc() to ksize()
> > if it is allocated by SLUB allocator and
> > size is larger than (I guess) PAGE_SIZE / 2.
> >
> > Regards.
> >
> > ---------- Kernel config (grep CONFIG_SLUB .config) ----------
> > CONFIG_SLUB_DEBUG=y
> > CONFIG_SLUB=y
> > # CONFIG_SLUB_DEBUG_ON is not set
> >
> > ---------- Testing program (ksize_test.c) ----------
> > #include <linux/module.h>
> > #include <linux/slab.h>
> >
> > static int __init init_ksize_test(void)
> > {
> >         void *p = kmalloc(2049, GFP_KERNEL);
> >         printk("ksize(%p) = %d\n", p, ksize(p));
> >         kfree(p);
> >         return -ENOMEM;
> > }
> >
> > module_init(init_ksize_test)
> >
> > MODULE_LICENSE("GPL");
> >
> > ------------[ cut here ]------------
> > kernel BUG at mm/slub.c:2562!
> > invalid opcode: 0000 [#1] SMP
> > Modules linked in: ksize_test
> >
> > Pid: 8473, comm: modprobe Not tainted (2.6.24-rc3-git6 #4)
> > EIP: 0060:[<c01714a2>] EFLAGS: 00010246 CPU: 1
> > EIP is at ksize+0x1b/0x4a
> > EAX: 00000000 EBX: dd776000 ECX: c16721d0 EDX: 00000000
> > ESI: e081b280 EDI: df3a396c EBP: dd595ea0 ESP: dd595ea0
> >  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
> > Process modprobe (pid: 8473, ti=dd595000 task=d347cd60 task.ti=dd595000)
> > Stack: dd595eb8 e081e01a dd595eb8 c014010c ffffffff e08193e0 dd595fb0 
> > c0150b18
> >        00000000 00000000 00001866 00000000 dd4dac00 d347cd60 c14366ac 
> > 00000230
> >        0000135c 0000000e dd4dac00 e081b280 00000000 00000000 00000000 
> > 00000000
> > Call Trace:
> >  [<c0106008>] show_trace_log_lvl+0x1a/0x2f
> >  [<c01060b8>] show_stack_log_lvl+0x9b/0xa3
> >  [<c0106167>] show_registers+0xa7/0x178
> >  [<c010634c>] die+0x114/0x1f5
> >  [<c0417018>] do_trap+0x8a/0xa3
> >  [<c01066ec>] do_invalid_op+0x88/0x92
> >  [<c0416dea>] error_code+0x72/0x78
> >  [<e081e01a>] init_ksize_test+0x1a/0x40 [ksize_test]
> >  [<c0150b18>] sys_init_module+0x13d3/0x14ff
> >  [<c0104f7e>] sysenter_past_esp+0x5f/0xa5
> >  =======================
> > Code: 8b 02 5d 84 c0 b8 00 00 00 00 0f 49 d0 89 d0 c3 55 85 c0 89 e5 
> > 75 04 0f 0b eb fe 31 d2 83 f8 10 74 34 e8 b4 ff ff ff 85 c0 75 04 <0f> 
> > 0b eb fe 8b 40 0c 85 c0 75 04 0f 0b eb fe 8b 10 f6 c6 0c 74
> > EIP: [<c01714a2>] ksize+0x1b/0x4a SS:ESP 0068:dd595ea0
> ..
>
> Is "p" NULL ?   Where'd your printk() output go to?
..

Mmm.. just tried it here, same result, and "p" is definitely not NULL.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/