From: wei huang <huang.wei56@xxxxxxxxxx>
Problem:
Multipathd segment faulty occured when device policy was configured in multipath.conf as follow:
#This is a device configuration just for COMPELNT device
devices {
device {
vendor COMPELNT
dev_loss_tmo 120
scheduler deadline
}
}
The call trace is:
Program received signal SIGSEGV, Segmentation fault.
0x00007f4eaaf49251 in __strstr_sse2 () from /lib64/libc.so.6
(gdb) bt
#0 0x00007f4eaaf49251 in __strstr_sse2 () from /lib64/libc.so.6
#1 0x00007f4eabba879c in add_feature (f=f@entry=0x211b248, n=n@entry=0x7f4eabbc530a queue_if_no_path)
at structs.c:524
#2 0x00007f4eabba6993 in merge_hwe (src=0x2148c70, dst=0x211b220) at config.c:359
#3 factorize_hwtable (hw=0x214b800, n=n@entry=77) at config.c:452
#4 0x00007f4eabba7850 in load_config (file=file@entry=0x4144c8 /etc/multipath.conf) at config.c:651
#5 0x0000000000408959 in reconfigure (vecs=vecs@entry=0x2128ae0) at main.c:2078
#6 0x00000000004063c6 in child (param=0x0) at main.c:2483
#7 main (argc=<optimized out>, argv=<optimized out>) at main.c:2725
(gdb) up
#1 0x00007f4eabba879c in add_feature (f=f@entry=0x211b248, n=n@entry=0x7f4eabbc530a queue_if_no_path)
at structs.c:524
524 if (strstr(*f, n))
(gdb) p *f
= 0x0
Reasons:
When multipathd loads config, it will call merge_hwe() to merge the features between default_hw[] and config.
If the vender is not configured features in default_hw[], dst->features's value will be null. So strstr()'s first
parameter *f is null in add_feature(),too.
Signed-off-by: wei huang <huang.wei56@xxxxxxxxxx>
---
libmultipath/structs.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/libmultipath/structs.c b/libmultipath/structs.c
index fee58e5..f673325 100644
--- a/libmultipath/structs.c
+++ b/libmultipath/structs.c
@@ -520,6 +520,17 @@ add_feature (char **f, char *n)
if (!n || *n == '0')
return 0;
+ /* default feature is null */
+ if(!*f)
+ {
+ l = asprintf(&t, "1 %s", n);
+ if(l == -1)
+ return 1;
+
+ *f = t;
+ return 0;
+ }
+
/* Check if feature is already present */
if (strstr(*f, n))
return 0;
--
2.8.1.windows.1
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