Hi all I have been trying cinelerra 1.1.9 in OSS mode against the OSS emulation driver (snd-pcm-oss) from ALSA driver 1.0.2c. Whenever anything is done to start audio playback (such as playing a video clip) the ALSA driver panics with a divide by zero error. The decoded oops is found below.
Under native OSS from 2.4.23 cinelerra works fine. Furthermore, all other OSS applications I've tried against ALSA driver 1.0.2c seem to be fine. Thus the problem seems to be associated with the way cinelerra does things - something it does is upsetting ALSA but is fine under native OSS. Of course, even a misbehaving application not running as root should not be able to panic the kernel. Tracing though this it appears that the substream's rate is zero heading into snd_pcm_timer_resolution_change and the divide by zero occurs as a result of the final statement in this function. Why the rate is zero to begin with though is a mystery to me. I've checked cinelerra/audiooss.C and the order of the OSS ioctls during setup at least appears to be correct. I'll check 1.0.3 in the next day or so but in a quick check of the CVS logs I saw nothing to indicate that anything in this area might have changed. Anyone have any ideas? Mar 14 14:26:04 marble kernel: CPU: 0 Mar 14 14:26:04 marble kernel: EIP: 0010:[<d8c31a28>] Not tainted Using defaults from ksymoops -t elf32-i386 -a i386 Mar 14 14:26:04 marble kernel: EFLAGS: 00010246 Mar 14 14:26:04 marble kernel: eax: ee6b0000 ebx: 00008000 ecx: 00008000 edx: 00000000 Mar 14 14:26:04 marble kernel: esi: 00000000 edi: ee6b0000 ebp: d3805800 esp: ce88b918 Mar 14 14:26:04 marble kernel: ds: 0018 es: 0018 ss: 0018 Mar 14 14:26:04 marble kernel: Process cinelerra (pid: 354, stackpage=ce88b000) Mar 14 14:26:04 marble kernel: Stack: 00000fa9 00008000 d3805800 00000001 ce88b95c c15a8d60 d8c28469 c15a8d60 Mar 14 14:26:04 marble kernel: 00010000 ce88a000 ce88b95c cdba7400 ce88bca4 d8c28584 c15a8d60 ce88b95c Mar 14 14:26:04 marble kernel: 0000025c 00000000 00000008 00000000 00000000 00000000 00000000 00000000 Mar 14 14:26:04 marble kernel: Call Trace: [<d8c28469>] [<d8c28584>] [<d8c2b756>] [<d8c2fe96>] [<d8c2be18>] Mar 14 14:26:04 marble kernel: [<d8c6dad1>] [<d8c6df0e>] [<d8c6ee93>] [<c014f4c6>] [<c01a98b0>] [<c014f782>] Mar 14 14:26:04 marble kernel: [<c01a98b0>] [<c01a9951>] [<c0133134>] [<d8c0b6cf>] [<d8c2e65c>] [<d8c2a9dd>] Mar 14 14:26:04 marble kernel: [<d8c6fc92>] [<d8c6ff57>] [<c014726e>] [<d8bf3d40>] [<d8c760e0>] [<d8bf365f>] Mar 14 14:26:04 marble kernel: [<c013a58c>] [<c023f38e>] [<c0124fc3>] [<c013a6ee>] [<d8c6efdc>] [<d8c705cb>] Mar 14 14:26:04 marble kernel: [<c0148689>] [<c01090ef>] Mar 14 14:26:04 marble kernel: Code: f7 f6 89 85 0c 02 00 00 83 c4 08 5b 5e 5f 5d c3 90 8d b4 26 >>EIP; d8c31a28 <[snd-pcm]snd_pcm_timer_resolution_change+88/a0> <===== >>ebp; d3805800 <_end+13491b1c/1881c37c> >>esp; ce88b918 <_end+e517c34/1881c37c> Trace; d8c28469 <[snd-pcm]snd_pcm_hw_params+209/2b0> Trace; d8c28584 <[snd-pcm]snd_pcm_hw_params_user+74/a0> Trace; d8c2b756 <[snd-pcm]snd_pcm_playback_ioctl1+56/340> Trace; d8c2fe96 <[snd-pcm]snd_pcm_hw_param_near+256/320> Trace; d8c2be18 <[snd-pcm]snd_pcm_kernel_playback_ioctl+38/50> Trace; d8c6dad1 <[snd-pcm-oss]snd_pcm_oss_change_params+3e1/7d0> Trace; d8c6df0e <[snd-pcm-oss]snd_pcm_oss_get_active_substream+4e/60> Trace; d8c6ee93 <[snd-pcm-oss]snd_pcm_oss_get_formats+23/140> Trace; c014f4c6 <get_new_inode+146/160> Trace; c01a98b0 <reiserfs_find_actor+0/40> Trace; c014f782 <iget4+e2/f0> Trace; c01a98b0 <reiserfs_find_actor+0/40> Trace; c01a9951 <reiserfs_iget+61/80> Trace; c0133134 <__alloc_pages+64/280> Trace; d8c0b6cf <[snd]snd_kcalloc+1f/50> Trace; d8c2e65c <[snd-pcm]snd_pcm_hw_constraint_minmax+3c/40> Trace; d8c2a9dd <[snd-pcm]snd_pcm_hw_constraints_complete+1fd/230> Trace; d8c6fc92 <[snd-pcm-oss]snd_pcm_oss_open_file+162/240> Trace; d8c6ff57 <[snd-pcm-oss]snd_pcm_oss_open+1e7/2c0> Trace; c014726e <page_follow_link+4e/50> Trace; d8bf3d40 <[soundcore]sound_loader_lock+0/0> Trace; d8c760e0 <[snd-pcm-oss]snd_pcm_oss_f_reg+0/48> Trace; d8bf365f <[soundcore]soundcore_open+df/190> Trace; c013a58c <get_chrfops+ec/100> Trace; c023f38e <sock_write+ae/c0> Trace; c0124fc3 <in_group_p+23/30> Trace; c013a6ee <chrdev_open+5e/70> Trace; d8c6efdc <[snd-pcm-oss]snd_pcm_oss_set_format+2c/60> Trace; d8c705cb <[snd-pcm-oss]snd_pcm_oss_ioctl+4fb/790> Trace; c0148689 <sys_ioctl+c9/250> Trace; c01090ef <system_call+33/38> Code; d8c31a28 <[snd-pcm]snd_pcm_timer_resolution_change+88/a0> 00000000 <_EIP>: Code; d8c31a28 <[snd-pcm]snd_pcm_timer_resolution_change+88/a0> <===== 0: f7 f6 div %esi <===== Code; d8c31a2a <[snd-pcm]snd_pcm_timer_resolution_change+8a/a0> 2: 89 85 0c 02 00 00 mov %eax,0x20c(%ebp) Code; d8c31a30 <[snd-pcm]snd_pcm_timer_resolution_change+90/a0> 8: 83 c4 08 add $0x8,%esp Code; d8c31a33 <[snd-pcm]snd_pcm_timer_resolution_change+93/a0> b: 5b pop %ebx Code; d8c31a34 <[snd-pcm]snd_pcm_timer_resolution_change+94/a0> c: 5e pop %esi Code; d8c31a35 <[snd-pcm]snd_pcm_timer_resolution_change+95/a0> d: 5f pop %edi Code; d8c31a36 <[snd-pcm]snd_pcm_timer_resolution_change+96/a0> e: 5d pop %ebp Code; d8c31a37 <[snd-pcm]snd_pcm_timer_resolution_change+97/a0> f: c3 ret Code; d8c31a38 <[snd-pcm]snd_pcm_timer_resolution_change+98/a0> 10: 90 nop Code; d8c31a39 <[snd-pcm]snd_pcm_timer_resolution_change+99/a0> 11: 8d b4 26 00 00 00 00 lea 0x0(%esi,1),%esi Regards jonathan -- * Jonathan Woithe [EMAIL PROTECTED] * * http://www.physics.adelaide.edu.au/~jwoithe * ***-----------------------------------------------------------------------*** ** "Time is an illusion; lunchtime doubly so" ** * "...you wouldn't recognize a subtle plan if it painted itself purple and * * danced naked on a harpsichord singing 'subtle plans are here again'" * ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. 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