Recent -current stable panic at later boot stage

[Andrey Chernov]

BTW, it never happens with 11-ALPHA3 even with world build for 12.

On 09.07.2016 22:06, Andrey Chernov wrote:
> SCHED_ULE used. I have textdump only. Interesting parts:
> <118>Starting syslogd.
> kernel trap 9 with interrupts disabled
> 
> Fatal trap 9: general protection fault while in kernel mode
> cpuid = 7; apic id = 07
> instruction pointer	= 0x20:0xffffffff806b2585
> stack pointer	        = 0x28:0xfffffe022ccce8d0
> frame pointer	        = 0x28:0xfffffe022ccce950
> code segment		= base 0x0, limit 0xfffff, type 0x1b
> 			= DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags	= resume, IOPL = 0
> current process		= 10 (idle: cpu7)
> 
> It happens at amd64/amd64/cpu_switch.S:ld_ldt:        lldt    %ax
> 
> db> bt
> 
> Tracing pid 10 tid 100009 td 0xfffff80002292000
> ld_ldt() at ld_ldt/frame 0xfffffe022ccce8e0
> sched_switch() at sched_switch+0x51d/frame 0xfffffe022ccce950
> mi_switch() at mi_switch+0x156/frame 0xfffffe022ccce980
> sched_idletd() at sched_idletd+0xf9/frame 0xfffffe022cccea70
> fork_exit() at fork_exit+0x84/frame 0xfffffe022ccceab0
> fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe022ccceab0
> --- trap 0, rip = 0, rsp = 0, rbp = 0 ---
>