Hello folks, I have spent some considerable time trying to get SpeakUp to run with some degree of reliability on the Raspberry Pi. I am getting a kernel oops which always reports the same thing. Unfortunately this appears to be some problem in a Broadcom driver in the RPI kernel source tree. It has taken me several weeks to get this far because I have had to learn kernel hacking from the ground up to get this far. I think somebody, it may have been you Chris B, asked for a stack trace. Here it is: -- snip -- pi at raspberrypi:~$ [ 2800.108144] Unable to handle kernel NULL pointer dereference at virtual address 00000008 [ 2800.117443] pgd = c0004000 [ 2800.120278] [00000008] *pgd=00000000 [ 2800.123972] Internal error: Oops: 5 [#1] PREEMPT ARM Entering kdb (current=0xda9481c0, pid 28) Oops: (null) due to oops @ 0xc024b634 Pid: 28, comm: VCHIQ-0 CPU: 0 Tainted: G C (3.6.11-su+ #1) PC is at vchiu_queue_is_empty+0x0/0x18 LR is at vchi_msg_dequeue+0x34/0xa0 pc : [<c024b634>] lr : [<c024afe8>] psr: 60000013 sp : da989f00 ip : 00000000 fp : c05be070 r10: 00000020 r9 : db000194 r8 : da989f24 r7 : 00000014 r6 : da989f20 r5 : 00000000 r4 : 00000004 r3 : da989f20 r2 : 00000014 r1 : da989f24 r0 : 00000004 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel Control: 00c5387d Table: 19c1c008 DAC: 00000017 [<c0013b7c>] (unwind_backtrace+0x0/0xf0) from [<c0073168>] (kdb_dumpregs+0x28/0x50) [<c0073168>] (kdb_dumpregs+0x28/0x50) from [<c00754ec>] (kdb_main_loop+0x3a8/0x6fc) [<c00754ec>] (kdb_main_loop+0x3a8/0x6fc) from [<c0077bd0>] (kdb_stub+0x154/0x380) [<c0077bd0>] (kdb_stub+0x154/0x380) from [<c006ed0c>] (kgdb_handle_exception+0x1f8/0x668) [<c006ed0c>] (kgdb_handle_exception+0x1f8/0x668) from [<c00132fc>] (kgdb_notify+0x24/0x40) [<c00132fc>] (kgdb_notify+0x24/0x40) from [<c0396c34>] (notifier_call_chain+0x44/0x84) [<c0396c34>] (notifier_call_chain+0x44/0x84) from [<c0396cac>] (__atomic_notifier_call_chain+0x38/0x4c) [<c0396cac>] (__atomic_notifier_call_chain+0x38/0x4c) from [<c0396cd8>] (atomic_notifier_call_chain+0x18/0x20) [<c0396cd8>] (atomic_notifier_call_chain+0x18/0x20) from [<c0396d18>] (notify_die+0x38/0x44) [<c0396d18>] (notify_die+0x38/0x44) from [<c0011138>] (die+0xc4/0x39c) [<c0011138>] (die+0xc4/0x39c) from [<c038fa50>] (__do_kernel_fault.part.9+0x54/0x74) [<c038fa50>] (__do_kernel_fault.part.9+0x54/0x74) from [<c0396944>] (do_page_fault+0x1e8/0x3ec) [<c0396944>] (do_page_fault+0x1e8/0x3ec) from [<c000832c>] (do_DataAbort+0x34/0x98) [<c000832c>] (do_DataAbort+0x34/0x98) from [<c0395138>] (__dabt_svc+0x38/0x60) Exception stack(0xda989eb8 to 0xda989f00) 9ea0: 00000004 da989f24 9ec0: 00000014 da989f20 00000004 00000000 da989f20 00000014 da989f24 db000194 9ee0: 00000020 c05be070 00000000 da989f00 c024afe8 c024b634 60000013 ffffffff [<c0395138>] (__dabt_svc+0x38/0x60) from [<c024b634>] (vchiu_queue_is_empty+0x0/0x18) [<c024b634>] (vchiu_queue_is_empty+0x0/0x18) from [<c024afe8>] (vchi_msg_dequeue+0x34/0xa0) [<c024afe8>] (vchi_msg_dequeue+0x34/0xa0) from [<bf075a94>] (audio_vchi_callback+0x48/0xac [snd_bcm2835]) [<bf075a94>] (audio_vchi_callback+0x48/0xac [snd_bcm2835]) from [<c024ae48>] (shim_callback+0x6c/0x138) [<c024ae48>] (shim_callback+0x6c/0x138) from [<c0244bf8>] (slot_handler_func+0xdfc/0x1728) [<c0244bf8>] (slot_handler_func+0xdfc/0x1728) from [<c003a914>] (kthread+0x88/0x94) [<c003a914>] (kthread+0x88/0x94) from [<c000eafc>] (kernel_thread_exit+0x0/0x8) kdb> -- snip -- Mike -- Michael A. Ray Analyst/Programmer Witley, Surrey, South-east UK Interested in accessibility on the Raspberry Pi? Visit: http://www.raspberryvi.org/ From where you can join our mailing list for visually-impaired Pi hackers
