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

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).

-- 
Andriy Gapon