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Subject: Re: Segfault with Faster MDCT patch and -fPIC

Re: Segfault with Faster MDCT patch and -fPIC

From: Slawomir Testowy <slawomir.testowy_at_gmail.com>
Date: Mon, 20 Sep 2010 11:58:42 +0200

2010/9/20 RafaŽl Carrť <rafael.carre_at_gmail.com>:
>
> Try disass $pc-32,$pc+32

Thanks!
>
>
> ... is not shown here, can you run the commands on the same crash?
>
> --
> RafaŽl Carrť
>

I'm sorry. My fault.

Program received signal SIGSEGV, Segmentation fault.
0x0003b3a0 in pass (z_arg=<value optimized out>, STEP_arg=<value
optimized out>, n_arg=<value optimized out>) at fft-ffmpeg.c:243
warning: Source file is more recent than executable.
243 w += STEP;
(gdb) bt
#0 0x0003b3a0 in pass (z_arg=<value optimized out>, STEP_arg=<value
optimized out>, n_arg=<value optimized out>) at fft-ffmpeg.c:243
#1 0x0003c080 in fft64 (z=0x1b10190) at fft-ffmpeg.c:355
#2 0x0003c0b0 in fft128 (z=0x1b10190) at fft-ffmpeg.c:356
#3 0x0003c0e0 in fft256 (z=0x1b10190) at fft-ffmpeg.c:357
#4 0x0003b924 in ff_fft_calc_c (nbits=<value optimized out>,
z=0x1ae2dc0) at fft-ffmpeg.c:370
#5 0x0003ad78 in ff_imdct_half (nbits=28199880, output=0x1b100c8,
input=<value optimized out>) at mdct-ffmpeg.c:112
#6 0x0003b178 in ff_imdct_calc (nbits=28377488, output=0x1afa5c8,
input=0x0) at mdct-ffmpeg.c:348
#7 0x0003a5ac in mapping0_inverse (vb=0xbef68670, l=0x1b0b538) at
mapping0.c:290
#8 0x00033270 in vorbis_synthesis (vb=0xbef68670, op=<value optimized
out>, decodep=1) at synthesis.c:75
...
(gdb) disass $pc-64,$pc+64
Dump of assembler code from 0x3b360 to 0x3b3e0:
   0x0003b360 <pass+296>: sub r4, r9, r2, lsl #1
   0x0003b364 <pass+300>: sub r6, r10, r6, lsl #1
   0x0003b368 <pass+304>: stm r0, {r9, r10}
   0x0003b36c <pass+308>: add r0, r11, r0
   0x0003b370 <pass+312>: ldm r0, {r9, r10}
   0x0003b374 <pass+316>: add r9, r7, r9
   0x0003b378 <pass+320>: add r10, r8, r10
   0x0003b37c <pass+324>: sub r7, r9, r7, lsl #1
   0x0003b380 <pass+328>: sub r8, r10, r8, lsl #1
   0x0003b384 <pass+332>: stm r0, {r9, r10}
   0x0003b388 <pass+336>: add r0, r11, r0
   0x0003b38c <pass+340>: stm r0, {r4, r6}
   0x0003b390 <pass+344>: add r0, r11, r0
   0x0003b394 <pass+348>: stm r0, {r7, r8}
   0x0003b398 <pass+352>: ldr r3, [pc, #916] ; 0x3b734 <pass+1276>
   0x0003b39c <pass+356>: ldr r12, [sp, #16]
=> 0x0003b3a0 <pass+360>: ldr r3, [r10, r3]
   0x0003b3a4 <pass+364>: add lr, r12, r1
   0x0003b3a8 <pass+368>: add r2, r12, lr
   0x0003b3ac <pass+372>: ldr r1, [sp, #24]
   0x0003b3b0 <pass+376>: str r3, [sp, #12]
   0x0003b3b4 <pass+380>: mov r5, r2
   0x0003b3b8 <pass+384>: lsl r3, r12, #1
   0x0003b3bc <pass+388>: add r2, r12, r2
   0x0003b3c0 <pass+392>: rsb r0, r1, r0
   0x0003b3c4 <pass+396>: str r3, [sp, #36] ; 0x24
   0x0003b3c8 <pass+400>: str r2, [sp, #32]
   0x0003b3cc <pass+404>: add r3, r0, #8
   0x0003b3d0 <pass+408>: ldm lr, {r4, r12}
   0x0003b3d4 <pass+412>: ldr r0, [sp, #20]
   0x0003b3d8 <pass+416>: add r3, r0, r3
   0x0003b3dc <pass+420>: ldm r3, {r9, r10}
End of assembler dump.
(gdb) info all-registers
r0 0x1b10190 28377488
r1 0x1ae2dc0 28192192
r2 0x0 0
r3 0x100 256
r4 0x0 0
r5 0x0 0
r6 0x0 0
r7 0x0 0
r8 0x0 0
r9 0x0 0
r10 0x0 0
r11 0x40 64
r12 0x400 1024
sp 0xbef68450 0xbef68450
lr 0x0 0
pc 0x3b3a0 0x3b3a0 <pass+360>
f0 0 (raw 0x0003f8cc0000000000000000)
f1 0 (raw 0x0003f8cc0000000000000000)
f2 0 (raw 0x0003f8cc0000000000000000)
f3 0 (raw 0x0003f8cc0000000000000000)
f4 0 (raw 0x0003f8cc0000000000000000)
f5 0 (raw 0x0003f8cc0000000000000000)
f6 0 (raw 0x0003f8cc0000000000000000)
f7 0 (raw 0x0003f8cc0000000000000000)
fps 0x0 0
cpsr 0x60000010 1610612752

-- 
regards,
Slawomir Testowy
Received on 2010-09-20

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