Public bug reported:
I obtained a coredump from a system where natty's multipathd had crashed
and received the following backtrace:
0 0x00007f802925da75 in *__GI_raise (sig=<value optimized out>)
at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1 0x00007f80292615c0 in *__GI_abort () at abort.c:92
#2 0x00007f80292974fb in __libc_message (do_abort=<value optimized out>,
fmt=<value optimized out>) at ../sysdeps/unix/sysv/linux/libc_fatal.c:189
#3 0x00007f80292a15b6 in malloc_printerr (action=3,
str=0x7f8029374c70 "double free or corruption (fasttop)",
ptr=<value optimized out>) at malloc.c:6266
#4 0x00007f80292a7e83 in *__GI___libc_free (mem=<value optimized out>)
at malloc.c:3738
#5 0x00000000004173a5 in xfree (p=0x147bcb0) at memory.c:52
#6 0x00000000004286cd in free_multipath (mpp=0x14ce1b0, free_paths=0)
at structs.c:172
#7 0x0000000000429285 in remove_map (mpp=0x14ce1b0, vecs=0x147b620,
stop_waiter=0, purge_vec=1) at structs_vec.c:141
#8 0x0000000000404e06 in ev_add_path (devname=0x16fae48 "sdi", vecs=0x147b620)
at main.c:438
#9 0x0000000000404913 in uev_add_path (dev=0x16fabc0, vecs=0x147b620)
at main.c:327
#10 0x000000000040584c in uev_trigger (uev=0x7f801c009940,
trigger_data=0x147b620) at main.c:684
#11 0x000000000042b679 in service_uevq () at uevent.c:77
#12 0x000000000042b714 in uevq_thread (et=0x0) at uevent.c:101
---Type <return> to continue, or q <return> to quit---
#13 0x00007f8029e579ca in start_thread () from /lib/libpthread.so.0
#14 0x00007f802931070d in clone ()
at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#15 0x0000000000000000 in ?? ()
So it looks like we are trying to free a non-NULL value here:
if (mpp->dmi)
FREE(mpp->dmi);
What's suspicious is that, after freeing that, we don't set it to NULL.
I took a look at upstream git, and found that they do now set it to NULL
after freeing it. This was part of the following commit:
commit b7ca0eaae6ccd8dca60df3e2ee93220eadd691ee
Author: Hannes Reinecke <h...@suse.de>
Date: Wed Jan 28 09:24:10 2009 +0100
Plug memory leaks
Running the internal memory checker revealed quite some memory
leaks.
Signed-off-by: Hannes Reinecke <h...@suse.de>
Note that this change is already included in oneiric.
** Affects: multipath-tools (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/829061
Title:
[SRU] double free of mpp->dmi in free_multipath()
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