** Description changed:
- It was brought to my attention that Trusty's multipath-tools is
- suffering some seg faults.
+ It was brought to my knowledge that multipath-tools is facing segfaults:
- The dumps were sent to me and I'll update this bug's description soon.
+ ----
+ Core was generated by `/sbin/multipath -v0 /dev/sdab'. Program terminated
with signal 11, Segmentation fault. #0 0x00007f2b5f6c8e88 in
scsi_sysfs_pathinfo (pp=0xe5c0e0) at discovery.c:441
+ ----
+
+ All core dumps I received - several - have IP at the same place:
+
+ ----
+ #0 0x00007f2b5f6c8e88 in scsi_sysfs_pathinfo (pp=0xe5c0e0) at discovery.c:441
+ #1 0x00007f2b5f6c9c26 in sysfs_pathinfo (pp=0xe5c0e0) at discovery.c:689
+ #2 0x00007f2b5f6ca48b in pathinfo (pp=0xe5c0e0, hwtable=0xe222f0, mask=63)
at discovery.c:823
+ #3 0x00007f2b5f6c7858 in store_pathinfo (pathvec=0xe2d8d0, hwtable=0xe222f0,
udevice=0xe5bc60, flag=31, pp_ptr=0x0) at discovery.c:57
+ #4 0x00007f2b5f6c7953 in path_discover (pathvec=0xe2d8d0, conf=0xe22110,
udevice=0xe5bc60, flag=31) at discovery.c:91
+ #5 0x00007f2b5f6c7ad3 in path_discovery (pathvec=0xe2d8d0, conf=0xe22110,
flag=31) at discovery.c:127
+ #6 0x00000000004025e6 in configure () at main.c:322
+ ----
+
+ From libmultipath/discovery.c:
+
+ if (!strncmp(udev_device_get_subsystem(parent), "scsi", 4)) {
+
+ It is clear that strncmp is not taking care of cases when
+ udev_device_get_subsystem returns NULL and that is - most likely - what
+ is happening here. I have checked upstream development for this
+ particular fix and found the following commit:
+
+ ----
+ commit e546687e046b1eb1cbe5567e9d7850cbbd682dba
+ Author: Benjamin Marzinski <bmarz...@redhat.com>
+ Date: Sat Jan 12 00:04:54 2013 -0600
+
+ multipath: check for NULL from udev_device_get_*
+
+ The udev_device_get_* functions can return NULL, an occassionally do
+ so in the multipathd code. multipath needs to check if the result
+ is NULL before dereferencing it.
+
+ Signed-off-by: Benjamin Marzinski <bmarz...@redhat.com>
+ ----
+
+ Takes care of exactly this situation. This commit is found in the
+ following versions:
+
+ ----
+ inaddy@rafael(/home/inaddy/Codes/bugs/1532789/upstream/multipath-tools)$ git
tag --contains e546687e046b1eb1cbe5567e9d7850cbbd682dba
+ 0.5.0
+ ----
+
+ And, from rmadison, this fix should be backported to Trusty & Vivid (not
+ at 0.5.0 yet).
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https://bugs.launchpad.net/bugs/1532789
Title:
Trusty multipath-tools suffering seg faults
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