kernel panic with _autoload_ nvidia driver

       Hello !

   This problems appears about 4-6 months ago after updating of -CURRENT host.
Unable to boot host with nvidia_load="YES" in loader.conf because panic.
But when nvidia driver loads manually via kldload, everything OK.
Nvidia driver version is 310.44 at this moment, but problem was and on  
earlier version too.

Here is output of debugging (full version at  
http://www.stasyan.com/devel/kern_crash_nvidia_autoload.txt)

........................
Loaded symbols for /boot/kernel/udf.ko.symbols
#0  doadump (textdump=0) at pcpu.h:253
253             __asm("movl %%fs:%1,%0" : "=r" (td)
(kgdb) backtrace
#0  doadump (textdump=0) at pcpu.h:253
#1  0xc050a991 in db_dump (dummy=-1062503683, dummy2=0, dummy3=-1,  
dummy4=0xfad2c8b4 "") at /usr/src/sys/ddb/db_command.c:543
#2  0xc050a487 in db_command (cmd_table=<value optimized out>) at  
/usr/src/sys/ddb/db_command.c:449
#3  0xc050a1a0 in db_command_loop () at /usr/src/sys/ddb/db_command.c:502
#4  0xc050c9e0 in db_trap (type=<value optimized out>, code=-86848816)  
at /usr/src/sys/ddb/db_main.c:231
#5  0xc0ab8278 in kdb_trap (type=<value optimized out>, code=<value  
optimized out>, tf=<value optimized out>)
     at /usr/src/sys/kern/subr_kdb.c:654
#6  0xc0e9f1ae in trap (frame=<value optimized out>) at  
/usr/src/sys/i386/i386/trap.c:720
#7  0xc0e8835c in calltrap () at /usr/src/sys/i386/i386/exception.s:169
#8  0xc0ab7afd in kdb_enter (why=0xc10786cb "panic", msg=<value  
optimized out>) at cpufunc.h:71
#9  0xc0a81503 in vpanic (fmt=<value optimized out>, ap=<value  
optimized out>) at /usr/src/sys/kern/kern_shutdown.c:747
#10 0xc0a813ba in kassert_panic (fmt=<value optimized out>) at  
/usr/src/sys/kern/kern_shutdown.c:642
#11 0xc0acfb55 in witness_warn (flags=<value optimized out>,  
lock=<value optimized out>) at /usr/src/sys/kern/subr_witness.c:1727
#12 0xc0ac7d95 in userret (td=0xc866c000, frame=<value optimized out>)  
at /usr/src/sys/kern/subr_trap.c:151
#13 0xc0e9fff1 in syscall (frame=<value optimized out>) at subr_syscall.c:178
#14 0xc0e883f1 in Xint0x80_syscall () at  
/usr/src/sys/i386/i386/exception.s:267
#15 0x00000033 in ?? ()
Previous frame inner to this frame (corrupt stack?)
Current language:  auto; currently minimal