[ktap] Re: [PATCH 8/8] Add ffi test cases and script
- From: Jovi Zhangwei <jovi.zhangwei@xxxxxxxxx>
- To: Yicheng Qin <qycqycqycqycqyc@xxxxxxxxx>
- Date: Wed, 27 Nov 2013 14:17:49 +0800
Hi Yicheng,
On Wed, Nov 27, 2013 at 3:52 AM, Yicheng Qin <qycqycqycqycqyc@xxxxxxxxx> wrote:
> Test cases include cparser ability, ffi.current function, C function call
> on user-defined kernel functions, C function call on native kernel functions.
>
After merged this patch set, kernel crashed after ran several times of
command `make test`(not caused by ffi testcase, I disabled the ffi testcase
in runtest.sh), seems like memory corruption.
When I roll back this patch set, everything goes fine.
154 [ 506.334011] IP: [<ffffffff8117e774>] kmem_cache_alloc_trace+0x74/0x150
155 [ 506.334011] PGD 6f78d067 PUD 0
156 [ 506.334011] Oops: 0000 [#1] SMP
157 [ 506.334011] Modules linked in: ktapvm(O) ebtable_nat ebtables
joydev e1000 [last unloaded: ktapvm]
158 [ 506.334011] CPU: 6 PID: 2501 Comm: ktap Tainted: G O
3.13.0-rc1+ #16
159 [ 506.334011] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
160 [ 506.334011] task: ffff8800797e2000 ti: ffff880067a96000
task.ti: ffff880067a96000
161 [ 506.334011] RIP: 0010:[<ffffffff8117e774>]
[<ffffffff8117e774>] kmem_cache_alloc_trace+0x74/0x150
162 [ 506.334011] RSP: 0018:ffff880067a97b18 EFLAGS: 00010246
163 [ 506.334011] RAX: 0000000000000000 RBX: 0000000000000010 RCX:
0000000000000000
164 [ 506.334011] RDX: 000000000000376a RSI: 0000000000000002 RDI:
ffff8800797e2000
165 [ 506.334011] RBP: ffff880067a97b48 R08: 0000000000016a00 R09:
ffffffffa0060410
166 [ 506.334011] R10: 0000000000000000 R11: 0000000000000001 R12:
0000000064696f76
167 [ 506.334011] R13: 00000000000080d0 R14: 00000000000004e0 R15:
ffff88007d003400
168 [ 506.334011] FS: 00007fce28038740(0000)
GS:ffff88007fcc0000(0000) knlGS:0000000000000000
169 [ 506.334011] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
170 [ 506.334011] CR2: 0000000064696f76 CR3: 0000000068567000 CR4:
00000000000006e0
171 [ 506.334011] Stack:
172 [ 506.334011] ffffffff81125ef5 ffff880074aed800 ffff880067a97c58
0000000000000000
173 [ 506.334011] 0000000000000000 0000000000000001 ffff880067a97b98
ffffffff81125ef5
174 [ 506.334011] 00000000000092c0 ffffffffa0060410 ffff88007a2be000
ffff880074aed800
175 [ 506.334011] Call Trace:
176 [ 506.334011] [<ffffffff81125ef5>] ? perf_event_alloc+0x55/0x430
177 [ 506.334011] [<ffffffff81125ef5>] perf_event_alloc+0x55/0x430
178 [ 506.334011] [<ffffffffa0060410>] ? kp_init_baselib+0x20/0x20 [ktapvm]
179 [ 506.334011] [<ffffffff81126ef6>]
perf_event_create_kernel_counter+0x26/0xe0
180 [ 506.334011] [<ffffffffa0060935>]
kp_perf_event_register+0xc5/0x200 [ktapvm]
181 [ 506.334011] [<ffffffffa0060cc0>]
ktap_lib_probe_by_id+0x250/0x300 [ktapvm]
182 [ 506.334011] [<ffffffffa0060a70>] ?
kp_perf_event_register+0x200/0x200 [ktapvm]
183 [ 506.334011] [<ffffffffa005b4a9>] precall+0x1c9/0x480 [ktapvm]
184 [ 506.334011] [<ffffffffa005c0f5>] kp_call+0x785/0x19f0 [ktapvm]
185 [ 506.334011] [<ffffffffa0056185>] ktap_ioctl+0x105/0x180 [ktapvm]
186 [ 506.334011] [<ffffffff811a0f80>] do_vfs_ioctl+0x300/0x520
187 [ 506.334011] [<ffffffff812c0c76>] ? file_has_perm+0x86/0xa0
188 [ 506.334011] [<ffffffff811a1221>] SyS_ioctl+0x81/0xa0
189 [ 506.334011] [<ffffffff81641b12>] system_call_fastpath+0x16/0x1b
I also try to figure out the memory allocation of csymbols by add simple print.
[root@localhost ktap]# git diff interpreter/
diff --git a/interpreter/kp_load.c b/interpreter/kp_load.c
index 543739e..33eabd5 100644
--- a/interpreter/kp_load.c
+++ b/interpreter/kp_load.c
@@ -298,6 +298,7 @@ static void load_csymbols(struct load_state *S)
return;
}
+ kp_printf(S->ks, "csym_nr: %d\n", csym_nr);
cs_arr = NEW_VECTOR(S, sizeof(csymbol)*csym_nr);
for (i = 0; i < csym_nr; i++) {
cs = &cs_arr[i];
The result is like:
[root@localhost ktap]# ./ktap scripts/helloworld.kp
csym_nr: 10
Hello World! I am ktap
Hmm, there don't have any cdef keyword in helloworld.kp, but still need to
allocate csym related memory.
Some memory allocation bug in ffi code?
Jovi
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