> Sounds indeed strange. Can you track is the pcm_file->substream getting > zeroed somewhere after it is set in snd_pcm_open_file? Like printing > both address of pcm_file and pcm_file->substream. I added a bunch of tracking to the ioctl handling in pcm_native.c to see where the substream pointer goes null. It appears that substream is valid through the SNDRV_PCM_IOCTL_START ioctl call, and then goes null for SNDRV_PCM_IOCTL_PVERSION and SNDRV_PCM_IOCTL_INFO where it finally crashes. I don't believe that it is the SNDRV_PCM_IOCTL_START that writes a null in substream, so it is likely something in alsa-lib :-( It isn't confidence inspiring to see comments like /* AB: FIXME!!! This is definitely nonsense */ in snd_pcm_info (the function where it finally crashes) Steve root@overo:~# mplayer -ao alsa /Watermelon_Slim-Black_Water.mp3 MPlayer 1.0rc2-4.3.1 (C) 2000-2007 MPlayer Team CPU: ARM Playing /Watermelon_Slim-Black_Water.mp3. Audio file file format detected. Clip info: Title: Black Water Artist: Watermelon Slim Album: http://music.download.com Year: 2007 Comment: http://music.download.com/ Track: 1 Genre: Unknown ========================================================================== Forced audio codec: mad Opening audio decoder: [libmad] libmad mpeg audio decoder AUDIO: 44100 Hz, 2 ch, s16le, 192.0 kbit/13.61% (ratio: 24000->176400) Selected audio codec: [mad] afm: libmad (libMAD MPEG layer 1-2-3) ========================================================================== snd_pcm_open_file 2102 substream c7bdb900 success: snd_pcm_open 2168 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_INFO:snd_pcm_common_ioctl1 2517 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_INFO:snd_pcm_common_ioctl1 2517 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_PVERSION:snd_pcm_common_ioctl1 2514 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_TSTAMP:snd_pcm_common_ioctl1 2520 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_SYNC_PTR:snd_pcm_common_ioctl1 2571 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_HW_REFINE:snd_pcm_common_ioctl1 2526 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_HW_REFINE:snd_pcm_common_ioctl1 2526 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_HW_REFINE:snd_pcm_common_ioctl1 2526 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_HW_REFINE:snd_pcm_common_ioctl1 2526 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_HW_REFINE:snd_pcm_common_ioctl1 2526 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_HW_REFINE:snd_pcm_common_ioctl1 2526 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_HW_REFINE:snd_pcm_common_ioctl1 2526 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_HW_REFINE:snd_pcm_common_ioctl1 2526 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_HW_REFINE:snd_pcm_common_ioctl1 2526 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_HW_PARAMS:snd_pcm_common_ioctl1 2529 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_SYNC_PTR:snd_pcm_common_ioctl1 2571 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_SW_PARAMS:snd_pcm_common_ioctl1 2535 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_CHANNEL_INFO:snd_pcm_common_ioctl1 2541 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_CHANNEL_INFO:snd_pcm_common_ioctl1 2541 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_PREPARE:snd_pcm_common_ioctl1 2544 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_SYNC_PTR:snd_pcm_common_ioctl1 2571 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_SW_PARAMS:snd_pcm_common_ioctl1 2535 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_SYNC_PTR:snd_pcm_common_ioctl1 2571 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream c7bdb900 SNDRV_PCM_IOCTL_START:snd_pcm_common_ioctl1 2550 substream c7bdb900 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream 00000000 SNDRV_PCM_IOCTL_PVERSION:snd_pcm_common_ioctl1 2514 substream 00000000 OTHER (passing to snd_pcm_common_ioctl1):snd_pcm_playback_ioctl1 2682 substream 00000000 SNDRV_PCM_IOCTL_INFO:snd_pcm_common_ioctl1 2517 substream 00000000 Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = c6db8000 [00000000] *pgd=86d5e031, *pte=00000000, *ppte=00000000 Internal error: Oops: 17 [#1] Modules linked in: ipv6 rtl8187 eeprom_93cx6 CPU: 0 Not tainted (2.6.27-rc3-omap1 #1) PC is at snd_pcm_info+0xc/0xe0 LR is at snd_pcm_info_user+0x38/0x94 pc : [<c0256414>] lr : [<c0256520>] psr: a0000013 sp : c6ccdd98 ip : c6ccddb8 fp : c6ccddb4 r10: 00000001 r9 : c6ccc000 r8 : c002ce04 r7 : 00000000 r6 : 00000000 r5 : c7b85c00 r4 : bef36480 r3 : 00000001 r2 : 00000000 r1 : c7b85c00 r0 : 00000000 Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 00c5387f Table: 86db8018 DAC: 00000015 Process mplayer (pid: 1719, stack limit = 0xc6ccc2e8) Stack: (0xc6ccdd98 to 0xc6cce000) dd80: bef36480 c7b85c00 dda0: 00000000 00000000 c6ccddd4 c6ccddb8 c0256520 c0256414 81204101 bef36480 ddc0: c6cca080 00000000 c6ccdefc c6ccddd8 c025783c c02564f4 00000025 c0430a98 dde0: c6ccde0c c6ccddf0 c002c04c c0051114 ffffffff d8200000 00000000 c6cca080 de00: c6ccded4 c6ccde10 c002c830 c002c00c c042e39c 000051cf 00000000 30000013 de20: c045252c bef36480 00000000 c6cca080 c03f8448 c0452588 00000000 c6ccded4 de40: c6ccde30 c6ccde58 c004cd4c c004d278 60000013 ffffffff c6c37480 00000006 de60: 30000013 0000005c c6ccde94 c6ccde78 c0083d8c c007e470 00000000 00000003 de80: 0000001f c6d79160 c6ccdedc c6ccde98 c008474c c0083cb0 00000000 00000000 dea0: c6c37480 c791a520 00000003 81204101 bef36480 00000000 c6cca080 c002ce04 dec0: c6ccc000 00000001 c6ccdeec c6ccded8 c004d2d0 81204101 bef36480 00000000 dee0: c6cca080 c002ce04 c6ccc000 00000001 c6ccdf2c c6ccdf00 c0258fe0 c025766c df00: c6ccdf54 c6ccdf10 c00868dc c0085b78 81204101 bef36480 00000005 c6cca080 df20: c6ccdf3c c6ccdf30 c0259108 c0258b84 c6ccdf54 c6ccdf40 c00a5bb8 c02590e0 df40: c6cca080 bef36480 c6ccdf7c c6ccdf58 c00a5e6c c00a5b90 406b6000 00000096 df60: 00000005 bef36480 81204101 c6cca080 c6ccdfa4 c6ccdf80 c00a5ebc c00a5c08 df80: c0086b54 00000000 402c0444 007ee3b0 402c0444 00000036 00000000 c6ccdfa8 dfa0: c002cc80 c00a5e88 402c0444 007ee3b0 00000005 81204101 bef36480 007fbf10 dfc0: 402c0444 007ee3b0 402c0444 00000036 bef36480 00000016 00000001 bef3665c dfe0: 007ee3b0 bef36458 4025a3d8 404c099c 20000010 00000005 00000000 00000000 Backtrace: [<c0256408>] (snd_pcm_info+0x0/0xe0) from [<c0256520>] (snd_pcm_info_user+0x38/0x94) r7:00000000 r6:00000000 r5:c7b85c00 r4:bef36480 [<c02564e8>] (snd_pcm_info_user+0x0/0x94) from [<c025783c>] (snd_pcm_common_ioctl1+0x1dc/0x10e4) r7:00000000 r6:c6cca080 r5:bef36480 r4:81204101 [<c0257660>] (snd_pcm_common_ioctl1+0x0/0x10e4) from [<c0258fe0>] (snd_pcm_playback_ioctl1+0x468/0x498) [<c0258b78>] (snd_pcm_playback_ioctl1+0x0/0x498) from [<c0259108>] (snd_pcm_playback_ioctl+0x34/0x38) r7:c6cca080 r6:00000005 r5:bef36480 r4:81204101 [<c02590d4>] (snd_pcm_playback_ioctl+0x0/0x38) from [<c00a5bb8>] (vfs_ioctl+0x34/0x78) [<c00a5b84>] (vfs_ioctl+0x0/0x78) from [<c00a5e6c>] (do_vfs_ioctl+0x270/0x280) r5:bef36480 r4:c6cca080 [<c00a5bfc>] (do_vfs_ioctl+0x0/0x280) from [<c00a5ebc>] (sys_ioctl+0x40/0x64) r7:c6cca080 r6:81204101 r5:bef36480 r4:00000005 [<c00a5e7c>] (sys_ioctl+0x0/0x64) from [<c002cc80>] (ret_fast_syscall+0x0/0x2c) r7:00000036 r6:402c0444 r5:007ee3b0 r4:402c0444 Code: e89da830 e1a0c00d e92dd8f0 e24cb004 (e5904000) ---[ end trace 720db3cd45410745 ]--- Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = c0004000 [00000000] *pgd=00000000 Internal error: Oops: 17 [#2] Modules linked in: ipv6 rtl8187 eeprom_93cx6 CPU: 0 Tainted: G D (2.6.27-rc3-omap1 #1) PC is at snd_pcm_release+0x20/0x88 LR is at __fput+0xb8/0x170 pc : [<c025590c>] lr : [<c009af68>] psr: a0000013 sp : c6ccdb60 ip : c6ccdb88 fp : c6ccdb84 r10: c79d8200 r9 : c6ccdd50 r8 : c6cca080 r7 : c6d9e2a8 r6 : c6cca080 r5 : c6c41ab0 r4 : 00000000 r3 : c02558ec r2 : 00000000 r1 : c6cca080 r0 : ffffffff Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 00c5387f Table: 86dbc018 DAC: 00000015 Process mplayer (pid: 1719, stack limit = 0xc6ccc2e8) Stack: (0xc6ccdb60 to 0xc6cce000) db60: 00000008 c6c41ab0 c6cca080 c7887788 c74eb980 c6ccdd50 c6ccdbb4 c6ccdb88 db80: c009af68 c02558f8 00000000 c6ccc000 c6cca080 00000000 c7887780 c7887788 dba0: 00000000 00000008 c6ccdbc4 c6ccdbb8 c009b2dc c009aebc c6ccdbe4 c6ccdbc8 dbc0: c009804c c009b2b8 c7887780 00000001 00000014 c7887788 c6ccdc0c c6ccdbe8 dbe0: c004de48 c0097fe4 c6ccc000 c791a520 0000000b c0256414 00000001 c6ccdd50 dc00: c6ccdc1c c6ccdc10 c004dec4 c004ddd0 c6ccdc34 c6ccdc20 c004f10c c004dea8 dc20: c004c458 c004c270 c6ccdc44 c6ccdc38 c0030864 c004ef0c c6ccdc64 c6ccdc48 dc40: c0031cf0 c00305cc 00010000 c6ca9b58 c791a520 c6c374b4 c6ccdca4 c6ccdc68 dc60: c0031f08 c0031c90 00000001 c0456944 0000000a 00000017 00000000 c0426850 dc80: 00000017 c6ccdd50 00000000 c002ce04 60000113 00000001 c6ccdd4c c6ccdca8 dca0: c002c1e8 c0031d0c c0051174 c00448d0 00000025 c0430a98 c6ccdce4 c6ccdcc8 dcc0: c002c04c c0051114 ffffffff d8200000 00000000 00000000 c6ccddac c6ccdce8 dce0: c002c830 c002c00c c042e39c 00005215 00000000 60000013 c045252c bef36480 dd00: 00000000 00000000 c03f7fe3 c0452572 00000000 c6ccddac c6ccdd08 c6ccdd30 dd20: c004cd4c c004d278 60000013 ffffffff ffffffff c6ccdd84 00000000 00000000 dd40: c6ccddb4 c6ccdd50 c002c7ec c002c1b8 00000000 c7b85c00 00000000 00000001 dd60: bef36480 c7b85c00 00000000 00000000 c002ce04 c6ccc000 00000001 c6ccddb4 dd80: c6ccddb8 c6ccdd98 c0256520 c0256414 a0000013 ffffffff bef36480 c7b85c00 dda0: 00000000 00000000 c6ccddd4 c6ccddb8 c0256520 c0256414 81204101 bef36480 ddc0: c6cca080 00000000 c6ccdefc c6ccddd8 c025783c c02564f4 00000025 c0430a98 dde0: c6ccde0c c6ccddf0 c002c04c c0051114 ffffffff d8200000 00000000 c6cca080 de00: c6ccded4 c6ccde10 c002c830 c002c00c c042e39c 000051cf 00000000 30000013 de20: c045252c bef36480 00000000 c6cca080 c03f8448 c0452588 00000000 c6ccded4 de40: c6ccde30 c6ccde58 c004cd4c c004d278 60000013 ffffffff c6c37480 00000006 de60: 30000013 0000005c c6ccde94 c6ccde78 c0083d8c c007e470 00000000 00000003 de80: 0000001f c6d79160 c6ccdedc c6ccde98 c008474c c0083cb0 00000000 00000000 dea0: c6c37480 c791a520 00000003 81204101 bef36480 00000000 c6cca080 c002ce04 dec0: c6ccc000 00000001 c6ccdeec c6ccded8 c004d2d0 81204101 bef36480 00000000 dee0: c6cca080 c002ce04 c6ccc000 00000001 c6ccdf2c c6ccdf00 c0258fe0 c025766c df00: c6ccdf54 c6ccdf10 c00868dc c0085b78 81204101 bef36480 00000005 c6cca080 df20: c6ccdf3c c6ccdf30 c0259108 c0258b84 c6ccdf54 c6ccdf40 c00a5bb8 c02590e0 df40: c6cca080 bef36480 c6ccdf7c c6ccdf58 c00a5e6c c00a5b90 406b6000 00000096 df60: 00000005 bef36480 81204101 c6cca080 c6ccdfa4 c6ccdf80 c00a5ebc c00a5c08 df80: c0086b54 00000000 402c0444 007ee3b0 402c0444 00000036 00000000 c6ccdfa8 dfa0: c002cc80 c00a5e88 402c0444 007ee3b0 00000005 81204101 bef36480 007fbf10 dfc0: 402c0444 007ee3b0 402c0444 00000036 bef36480 00000016 00000001 bef3665c dfe0: 007ee3b0 bef36458 4025a3d8 404c099c 20000010 00000005 00000000 00000000 Backtrace: [<c02558ec>] (snd_pcm_release+0x0/0x88) from [<c009af68>] (__fput+0xb8/0x170) r9:c6ccdd50 r8:c74eb980 r7:c7887788 r6:c6cca080 r5:c6c41ab0 r4:00000008 [<c009aeb0>] (__fput+0x0/0x170) from [<c009b2dc>] (fput+0x30/0x34) [<c009b2ac>] (fput+0x0/0x34) from [<c009804c>] (filp_close+0x74/0x80) [<c0097fd8>] (filp_close+0x0/0x80) from [<c004de48>] (put_files_struct+0x84/0xd8) r7:c7887788 r6:00000014 r5:00000001 r4:c7887780 [<c004ddc4>] (put_files_struct+0x0/0xd8) from [<c004dec4>] (exit_files+0x28/0x2c) r9:c6ccdd50 r8:00000001 r7:c0256414 r6:0000000b r5:c791a520 r4:c6ccc000 [<c004de9c>] (exit_files+0x0/0x2c) from [<c004f10c>] (do_exit+0x20c/0x6e8) [<c004ef00>] (do_exit+0x0/0x6e8) from [<c0030864>] (die+0x2a4/0x300) [<c00305c0>] (die+0x0/0x300) from [<c0031cf0>] (__do_kernel_fault+0x6c/0x7c) [<c0031c84>] (__do_kernel_fault+0x0/0x7c) from [<c0031f08>] (do_page_fault+0x208/0x224) r7:c6c374b4 r6:c791a520 r5:c6ca9b58 r4:00010000 [<c0031d00>] (do_page_fault+0x0/0x224) from [<c002c1e8>] (do_DataAbort+0x3c/0x9c) [<c002c1ac>] (do_DataAbort+0x0/0x9c) from [<c002c7ec>] (__dabt_svc+0x4c/0x60) Exception stack(0xc6ccdd50 to 0xc6ccdd98) dd40: 00000000 c7b85c00 00000000 00000001 dd60: bef36480 c7b85c00 00000000 00000000 c002ce04 c6ccc000 00000001 c6ccddb4 dd80: c6ccddb8 c6ccdd98 c0256520 c0256414 a0000013 ffffffff r7:00000000 r6:00000000 r5:c6ccdd84 r4:ffffffff [<c0256408>] (snd_pcm_info+0x0/0xe0) from [<c0256520>] (snd_pcm_info_user+0x38/0x94) r7:00000000 r6:00000000 r5:c7b85c00 r4:bef36480 [<c02564e8>] (snd_pcm_info_user+0x0/0x94) from [<c025783c>] (snd_pcm_common_ioctl1+0x1dc/0x10e4) r7:00000000 r6:c6cca080 r5:bef36480 r4:81204101 [<c0257660>] (snd_pcm_common_ioctl1+0x0/0x10e4) from [<c0258fe0>] (snd_pcm_playback_ioctl1+0x468/0x498) [<c0258b78>] (snd_pcm_playback_ioctl1+0x0/0x498) from [<c0259108>] (snd_pcm_playback_ioctl+0x34/0x38) r7:c6cca080 r6:00000005 r5:bef36480 r4:81204101 [<c02590d4>] (snd_pcm_playback_ioctl+0x0/0x38) from [<c00a5bb8>] (vfs_ioctl+0x34/0x78) [<c00a5b84>] (vfs_ioctl+0x0/0x78) from [<c00a5e6c>] (do_vfs_ioctl+0x270/0x280) r5:bef36480 r4:c6cca080 [<c00a5bfc>] (do_vfs_ioctl+0x0/0x280) from [<c00a5ebc>] (sys_ioctl+0x40/0x64) r7:c6cca080 r6:81204101 r5:bef36480 r4:00000005 [<c00a5e7c>] (sys_ioctl+0x0/0x64) from [<c002cc80>] (ret_fast_syscall+0x0/0x2c) r7:00000036 r6:402c0444 r5:007ee3b0 r4:402c0444 Code: e3a02000 e3e00000 e5974000 e1a08001 (e5945000) ---[ end trace 720db3cd45410745 ]--- Fixing recursive fault but reboot is needed! -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
