Re: ruby 2.6.3 died with "divide error" when switching to fbcon

[James S. <jsi...@in...>]

I just looked at the code. The only way the could happen is if 
info->var.bits_per_pixel equals zero. Need to check the initialization to 
see if it sets this.
 

> Configuration: matrox G550 dualhead, everything compiled-in (fbcon & 
> framebuffer) no modules, smp, no preempt.
> 
> (Some stuff omitted, but I have a digital photo of it
> if it matters.)
> 
> The framebuffers came up fine, then I got this:
> Console: switching to colour MATROX 160x64 vc:1-16
> divide error: 0000 [#1]
> CPU:1
> EIP: 060:[<c02afccb>] Not tainted
> EFLAGS: 00010246
> EIP is at cfb_imageblit+0x27b/0x610
> eax:00000020 ebx:00000000 ecx: 00000020 edx: 00000000
> esi:00000000 edi:00000000 ebp: 00000000 esp: c13dfd84
> ds:007b es:007b ss:0068
> Process swapper (pid:1 ...
> stack: ...
> Call trace:
> move_buf_aligned
> accel_putc
> fbcon_putc
> hide_softcursor
> update_screen
> vt_map_display
> fbcon_add
> cache_alloc_refill
> fbcon_event_notify
> notifier_call_chain
> register_framebuffer
> matroxfb_db_regit
> matroxfb_db_register
> fbcon_add
> matroxfb_crtc2_probe
> matroxfb_register_driver
> matroxfb_crtc2_init
> do_initcalls
> init_workqueues
> init
> init
> kernel_thread_helper
> Code: f7 f7 85 d2 0f 85 ab 01 00 00 85 ed 0f 85 a3 01 00 00 8b 54
> <0>Kernel panic: Attempted to kill init!
> <0>Rebooting in 300 seconds
> 
> I checked out ruby from cvs yesterday, and copied it into
> a 2.6.3 source tree.
> 
> Helge Hafting
> 
> 
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