Re: panic in drm or vt or deadlock on mutex or ...

On Wed, Feb 03, 2021 at 10:42:21AM +0200, Andriy Gapon wrote:
> On 03/02/2021 07:08, Steve Kargl wrote:
> > Fatal trap 12: page fault while in kernel mode
> > cpuid = 0; apic id = 00
> > fault virtual address	= 0xccccc374
> > fault code		= supervisor read data, page not present
> > instruction pointer	= 0x20:0xef411f
> > stack pointer	        = 0x28:0x4074e97c
> > frame pointer	        = 0x28:0x4074e988
> > code segment		= base 0x0, limit 0xfffff, type 0x1b
> > 			= DPL 0, pres 1, def32 1, gran 1
> > processor eflags	= interrupt enabled, resume, IOPL = 0
> > current process		= 91696 (chrome)
> > trap number		= 12
> ...
> > panic: page fault
> > cpuid = 0
> > time = 1612328062
> > KDB: stack backtrace:
> > db_trace_self_wrapper(2,4074e93c,c,0,4074e800,...) at db_trace_self_wrapper+0x28/frame 0x4074e7d4
> > vpanic(f9d603,4074e80c,4074e80c,4074e834,f6e2b7,...) at vpanic+0x11a/frame 0x4074e7ec
> > panic(f9d603,fe16b8,0,fffff,ccccc39b,...) at panic+0x14/frame 0x4074e800
> > trap_fatal(1327100,0,c95893,78f03f4,4074e860,...) at trap_fatal+0x347/frame 0x4074e834
> > trap_pfault(ccccc374,0,0) at trap_pfault+0x30/frame 0x4074e864
> > trap(4074e93c,8,28,28,0,...) at trap+0x381/frame 0x4074e930
> > calltrap() at 0xffc0319f/frame 0x4074e930
> > --- trap 0xc, eip = 0xef411f, esp = 0x4074e97c, ebp = 0x4074e988 ---
> > vm_radix_lookup(28c7b884,2,0) at vm_radix_lookup+0x7f/frame 0x4074e988
> > vm_page_lookup(28c7b854,2,0) at vm_page_lookup+0x15/frame 0x4074e99c
> > vm_fault(24ed8d58,3488b000,2,0,4074eab0) at vm_fault+0x839/frame 0x4074ea48
> > vm_fault_quick_hold_pages(24ed8d58,34889f00,8000,2,4074eaa8,12) at vm_fault_quick_hold_pages+0x122/frame 0x4074ea88
> > vn_io_fault1(247f4380) at vn_io_fault1+0x214/frame 0x4074eb44
> > vn_io_fault(2f5a58e8,4074ebc8,262c1e00,0,247f4380) at vn_io_fault+0x1c4/frame 0x4074eb7c
> > dofileread(2f5a58e8,4074ebc8,ffffffff,ffffffff,0) at dofileread+0x6d/frame 0x4074ebac
> > sys_read(247f4380,247f4618,343fb000,247f4380,40516068,...) at sys_read+0x67/frame 0x4074ec00
> > syscall(4074ece8,3b,3b,3b,2d130d1c,...) at syscall+0x17d/frame 0x4074ecdc
> > Xint0x80_syscall() at 0xffc033f9/frame 0x4074ecdc
> > --- syscall (881410048), eip = 0x2d086faf, esp = 0xfa1e339c, ebp = 0xfa1e33c8 ---
> > KDB: enter: panic
> 
> This is the crash.
> The DRM mutex noise is just noise (but it would be good to get rid of it).

OK.  It only happens with drm.

What other info is needed to help track this down?
I have kernel.debug, vmcore.0, and core.txt.0, so 
can use kgdb if someone would like more information.

__ 
steve