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)