#2073: voice-recording.state + arecord: Unable to handle kernel NULL pointer
dereference at virtual address 00000000
---------------------+------------------------------------------------------
Reporter: lindi | Owner: openmoko-devel
Type: defect | Status: new
Priority: normal | Milestone:
Component: unknown | Version:
Severity: normal | Keywords:
Haspatch: 0 | Blockedby:
Estimated: | Patchreview:
Blocking: | Reproducible: always
---------------------+------------------------------------------------------
Comment(by lindi):
If I just avoid dereferencing the NULL pointer I can still sometimes make
the kernel crash differently. I did
{{{
li...@ginger:/etc/alsa-scenarios$ sudo chvt 1
li...@ginger:/etc/alsa-scenarios$ alsactl -f stereoout.state restore
li...@ginger:/etc/alsa-scenarios$ alsactl -f voice-recording.state restore
li...@ginger:/etc/alsa-scenarios$ arecord -f S16_LE -c1 -r44100
/dev/shm/a.wav &
[1] 1777
li...@ginger:/etc/alsa-scenarios$ arecord: main:564: audio open error:
Invalid argument
[1]+ Exit 1 arecord -f S16_LE -c1 -r44100 /dev/shm/a.wav
li...@ginger:/etc/alsa-scenarios$ alsactl -f stereoout.state restore
li...@ginger:/etc/alsa-scenarios$ arecord -f S16_LE -c1 -r44100
/dev/shm/a.wav &
[1] 1780
li...@ginger:/etc/alsa-scenarios$ Recording WAVE '/dev/shm/a.wav' : Signed
16 bit Little Endian, Rate 44100 Hz, Mono
li...@ginger:/etc/alsa-scenarios$ alsactl -f stereoout.state restore
}}}
and with the patch for #2135 I was able to capture the full crash message
after reboot. I'll attach a complete version to this report but the
interesting parts are:
{{{
INFO: trying to register non-static key.
[21474693.155000] the code is fine but needs lockdep annotation.
[21474693.155000] turning off the locking correctness validator.
[21474693.155000] [<c03a6378>] (dump_stack+0x0/0x14) from [<c0075a74>]
(__lock_acquire+0x1a0/0x794)
...
[21474693.155000] Unable to handle kernel NULL pointer dereference at
virtual address 00000004
...
[21474693.155000] [<c02e6b40>] (s3c24xx_pcm_pointer+0x0/0x84) from
[<c02d3e34>] (snd_pcm_period_elapsed+0xbc/0x330)
[21474693.155000] r6:c7a64200 r5:c04f41fc r4:c7a73000
[21474693.155000] [<c02d3d78>] (snd_pcm_period_elapsed+0x0/0x330) from
[<c02e6f6c>] (s3c24xx_audio_buffdone+0x2c/0xd0)
[21474693.155000] [<c02e6f40>] (s3c24xx_audio_buffdone+0x0/0xd0) from
[<c00431e8>] (s3c2410_dma_irq+0xc4/0x4c4)
[21474693.155000] r7:00000022 r6:00000000 r5:c04f41fc r4:c7a163c0
[21474693.155000] [<c0043124>] (s3c2410_dma_irq+0x0/0x4c4) from
[<c00830c8>] (handle_IRQ_event+0x2c/0x68)
[21474693.155000] r7:00000022 r6:00000000 r5:00000000 r4:c6c4f980
...
[21474693.160000] Kernel panic - not syncing: Fatal exception in interrupt
[21474693.165000] Rebooting in 10 seconds..arch_reset: attempting watchdog
reset
}}}
--
Ticket URL: <https://docs.openmoko.org/trac/ticket/2073#comment:12>
docs.openmoko.org <http://docs.openmoko.org/trac/>
openmoko trac
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