[alsa-devel] Kernel crash at snd_ctl_find_numid+0x38/0x6c in kernel 4.4
Rohit Kumar
me.rohit at live.com
Mon Feb 13 19:17:42 CET 2017
Hi,
I am getting NULL pointer dereference occasionally at snd_ctl_find_numid+0x38/0x6c in 4.4 kernel while accessing snd_kcontrol. The issue is reproduced ocassionally. Can anybody provide any pointer in fixing the issue. Below is the stack trace :
2662.430298: <2> PC is at snd_ctl_find_numid+0x38/0x6c
2662.437819: <2> LR is at snd_ctl_find_id+0x38/0xd8
2662.662838: <2> [<ffffff8008c4e35c>] snd_ctl_find_numid+0x38/0x6c
2662.667513: <2> [<ffffff8008c4e900>] snd_ctl_find_id+0x38/0xd8
2662.673415: <2> [<ffffff8008c4f488>] snd_ctl_elem_info+0x40/0x11c
2662.678799: <2> [<ffffff8008c4df5c>] snd_ctl_ioctl_compat+0x3f4/0x740
2662.684644: <2> [<ffffff800823477c>] compat_SyS_ioctl+0x124/0xd88
There is no specific usecase when the issue is observed. Sometimes issue occurs during bootup and sometimes during audio usecase.
Any suggestion will be helpful.
Thanks,
Rohit
More information about the Alsa-devel
mailing list