[pulseaudio-tickets] [Bug 65474] New: libpulsecommon.so alignment memory access issue

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65474

          Priority: medium
            Bug ID: 65474
                CC: lennart at poettering.net
          Assignee: pulseaudio-bugs at lists.freedesktop.org
           Summary: libpulsecommon.so alignment memory access issue
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: changyp6 at gmail.com
          Hardware: ARM
            Status: NEW
           Version: unspecified
         Component: core
           Product: PulseAudio

I cross compiled PulseAudio 4.0 using codesourcery 2011.09 to ARM platform with
the following CFLAGS
-march=armv6k -mtune=arm1136j-s -msoft-float -O3 -fPIC

pulseaudio daemon runs perfectly without any problem, but when I start to run
client application like pactl info, the connection always fail with the
following error messages:

# pactl  info
I: [pulseaudio][pulsecore/client.c:80 pa_client_new()] Created 0 "Native client
(UNIX socket client)"
D: [pulseaudio][pulsecore/protocol-dbus.c:773 pa_dbus_protocol_add_interface()]
Interface org.PulseAudio.Core1.Client added for object
/org/pulseaudio/core1/client0
D: [pulseaudio][pulsecore/protocol-native.c:2599 command_auth()] Protocol
version: remote 28, local 28
I: [pulseaudio][pulsecore/protocol-native.c:2632 command_auth()] Got
credentials: uid=0 gid=0 success=1
D: [pulseaudio][pulsecore/protocol-native.c:2662 command_auth()] SHM possible:
yes
D: [pulseaudio][pulsecore/protocol-native.c:2680 command_auth()] Negotiated
SHM: yes
E: [pulseaudio][pulsecore/protocol-native.c:1939 protocol_error()] protocol
error, kicking client
I: [pulseaudio][pulsecore/client.c:102 pa_client_free()] Freed 0 "Native client
(UNIX socket client)"
D: [pulseaudio][pulsecore/protocol-dbus.c:835
pa_dbus_protocol_remove_interface()] Interface org.PulseAudio.Core1.Client
removed from object /org/pulseaudio/core1/client0
Connection failure: Connection terminated

I did some digging on this error, I found connection is terminated on function:
command_set_client_name(), and the root failure is in function:
pa_tagstruct_get_arbitrary(), on this check "if (t->data[t->rindex] !=
PA_TAG_ARBITRARY)".

Then I print out t->data[t->rindex] value to see if it's PA_TAG_ARBITRARY, what
is strange is that this value is a randome value.

I go back to check the compiling log, and found the following warnings:
pulsecore/hashmap.c: In function 'remove_entry':
pulsecore/hashmap.c:94:9: warning: cast increases required alignment of target
type [-Wcast-align]
pulsecore/hashmap.c: In function 'hash_scan':
pulsecore/hashmap.c:116:14: warning: cast increases required alignment of
target type [-Wcast-align]
pulsecore/hashmap.c: In function 'pa_hashmap_put':
pulsecore/hashmap.c:141:22: warning: cast increases required alignment of
target type [-Wcast-align]
pulsecore/hashmap.c:143:9: warning: cast increases required alignment of target
type [-Wcast-align]
pulsecore/hashmap.c:144:9: warning: cast increases required alignment of target
type [-Wcast-align]
pulsecore/hashmap.c:145:5: warning: cast increases required alignment of target
type [-Wcast-align]

These files are included in libpulsecommon.so

Then I have to add -mno-unaligned-access to CLFAGS, then re-compile pulseaudio
again. I replaced the original one with newly compiled libpulsecommon.so,
leaving other libraries untouched, everything goes well without any issue.

So I think this must be an unaligned memory access issue in libpulsecommon.so

Please help to fix this!!

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