pcm.c:3236: snd_pcm_area_copy: Assertion `src < dst || src >= dst + bytes' failed.

[Nicolas Pitre]

Anyone could tell me what's wrong with the attached code? I get a 100% 
reproducible crash that ends in $subject and a core dump as soon as 
snd_pcm_drain() is called.

This is a test case to reliably demonstrate the same issue I get when 
using espeak-ng. It is somewhat harder to reproduce with espeak as it 
happens more randomly, but still highly irritating.

Here's the output from the attached test case on my system using
alsalib v1.2.7.1:

PCM config dump:
Plug PCM: Rate conversion PCM (48000, sformat=S16_LE)
Converter: linear-interpolation
Protocol version: 10003
Its setup is:
  stream       : PLAYBACK
  access       : RW_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 1
  rate         : 22050
  exact rate   : 22050 (22050/1)
  msbits       : 16
  buffer_size  : 1411
  period_size  : 470
  period_time  : 21333
  tstamp_mode  : NONE
  tstamp_type  : MONOTONIC
  period_step  : 1
  avail_min    : 470
  period_event : 0
  start_threshold  : 1
  stop_threshold   : 1411
  silence_threshold: 0
  silence_size : 0
  boundary     : 3177289537109884928
Slave: Route conversion PCM (sformat=S16_LE)
  Transformation table:
    0 <- 0
    1 <- 0
Its setup is:
  stream       : PLAYBACK
  access       : MMAP_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 1
  rate         : 48000
  exact rate   : 48000 (48000/1)
  msbits       : 16
  buffer_size  : 3072
  period_size  : 1024
  period_time  : 21333
  tstamp_mode  : NONE
  tstamp_type  : MONOTONIC
  period_step  : 1
  avail_min    : 1024
  period_event : 0
  start_threshold  : 2
  stop_threshold   : 3072
  silence_threshold: 0
  silence_size : 0
  boundary     : 6917529027641081856
Slave: Direct Stream Mixing PCM
Its setup is:
  stream       : PLAYBACK
  access       : MMAP_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 2
  rate         : 48000
  exact rate   : 48000 (48000/1)
  msbits       : 16
  buffer_size  : 3072
  period_size  : 1024
  period_time  : 21333
  tstamp_mode  : NONE
  tstamp_type  : MONOTONIC
  period_step  : 1
  avail_min    : 1024
  period_event : 0
  start_threshold  : 2
  stop_threshold   : 3072
  silence_threshold: 0
  silence_size : 0
  boundary     : 6917529027641081856
Hardware PCM card 1 'HDA Intel PCH' device 0 subdevice 0
Its setup is:
  stream       : PLAYBACK
  access       : MMAP_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 2
  rate         : 48000
  exact rate   : 48000 (48000/1)
  msbits       : 16
  buffer_size  : 4096
  period_size  : 1024
  period_time  : 21333
  tstamp_mode  : ENABLE
  tstamp_type  : MONOTONIC
  period_step  : 1
  avail_min    : 1024
  period_event : 0
  start_threshold  : 1
  stop_threshold   : 0
  silence_threshold: 0
  silence_size : 0
  boundary     : 4611686018427387904
  appl_ptr     : 0
  hw_ptr       : 5121

frames = 1411
writing whole buffer
writing whole buffer
writing whole buffer minus 1 frame
draining audio
alsa_quickcrash: pcm.c:3236: snd_pcm_area_copy: Assertion `src < dst || src >= dst + bytes' failed.
Aborted (core dumped)
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