From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: [BUG 2.6.24-rc3-git6] SLUB's ksize() fails for size > 2048. From: Tetsuo Handa Message-Id: <200712021939.HHH18792.FLQSOOtFOFJVHM@I-love.SAKURA.ne.jp> Date: Sun, 2 Dec 2007 19:39:59 +0900 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-linux-mm@kvack.org Return-Path: To: linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: 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 #include 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:[] 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: [] show_trace_log_lvl+0x1a/0x2f [] show_stack_log_lvl+0x9b/0xa3 [] show_registers+0xa7/0x178 [] die+0x114/0x1f5 [] do_trap+0x8a/0xa3 [] do_invalid_op+0x88/0x92 [] error_code+0x72/0x78 [] init_ksize_test+0x1a/0x40 [ksize_test] [] sys_init_module+0x13d3/0x14ff [] 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: [] ksize+0x1b/0x4a SS:ESP 0068:dd595ea0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org