Hi All,

I found weird bug when I have a bluetooth a2dp test. The bug has been reported to Bugzilla[1] but I wonder why it was not reported since fedora 23. Is there any guys to have a a2dp test on arm since fedora 23? I think the bug seems to be from gcc or gcc build option since gcc-5.x.

I've tried several approach to avoid SIGSEGV of pulseaudio process.

Base platform is fedora 24 arm. 1. Use fedora24's sbc-1.3-4.fc24.armv7hl -> SIGSEGV 2. Install fedora23's sbc-1.3-3.fc23.armv7hl -> SIGSEGV 3. Install fedora22's sbc-1.3-2.fc22.armv7hl -> Success 4. Build sbc-1.3-2.fc22 on fedora 22 -> SIGSEGV

The sbc-1.3-2 has been never built again since it was released from fedora22. As I know, gcc version was changed from gcc-4.9 to gcc-5.3 after released fedora22. I think it could affect the operation of sbc.

Below is GDB debug information of SIGSEGV error of pulseaudio. Thread 4 "bluetooth" received signal SIGSEGV, Segmentation fault. [Switching to Thread 0xb0899300 (LWP 3814)] 0xb08a7a58 in sbc_analyze_eight_armv6 () at sbc/sbc_primitives_armv6.c:115 115 __asm__ volatile ( (gdb) bt #0 0xb08a7a58 in sbc_analyze_eight_armv6 () at sbc/sbc_primitives_armv6.c:115 #1 0x0000fffe in ?? () Backtrace stopped: previous frame identical to this frame (corrupt stack?) (gdb) disassemble Dump of assembler code for function sbc_analyze_eight_armv6: <snip> 0xb08a7a40 <+440>: smlad r4, lr, r8, r4 0xb08a7a44 <+444>: smlad r5, lr, r9, r5 0xb08a7a48 <+448>: ldrd r8, [r2, #40] ; 0x28 0xb08a7a4c <+452>: smlad r6, lr, r10, r6 0xb08a7a50 <+456>: smlad r7, lr, r11, r7 0xb08a7a54 <+460>: ldrd r10, [r2, #48] ; 0x30 => 0xb08a7a58 <+464>: stmia r1!, {r4, r5} 0xb08a7a5c <+468>: smuad r4, r3, r8 0xb08a7a60 <+472>: smuad r5, r3, r9 ---Type <return> to continue, or q <return> to quit--- 0xb08a7a64 <+476>: ldrd r8, [r2, #72] ; 0x48 0xb08a7a68 <+480>: stmia r1!, {r6, r7} 0xb08a7a6c <+484>: smuad r6, r3, r10 0xb08a7a70 <+488>: smuad r7, r3, r11 0xb08a7a74 <+492>: ldrd r10, [r2, #80] ; 0x50 0xb08a7a78 <+496>: smlad r4, r12, r8, r4

(gdb) info registers r0 0xfffc0001 4294705153 r1 0xb705a4af 3070600367 r2 0xb08a8c08 2961869832 r3 0x1ffff 131071 r4 0x201b 8219 r5 0x15467 87143 r6 0xffff5f4d 4294926157 r7 0xfffe8306 4294869766 r8 0x1d4d206f 491593839 r9 0x33badf91 867884945 r10 0xa4adf91 172679057 r11 0xd426206f 3559268463 r12 0x20003 131075 sp 0xb0898bf8 0xb0898bf8 lr 0xffff 65535 pc 0xb08a7a58 0xb08a7a58 <sbc_analyze_eight_armv6+464> cpsr 0x80000010 -2147483632

It seems alignment error of stmia instruction.

[1]: https://bugzilla.redhat.com/show_bug.cgi?id=1350490