Re: port-xen/48125 dom0 panic during domU creation attempt

[Jaromír Doleček <jaromir.dolecek%gmail.com@localhost>]

The following reply was made to PR port-xen/48125; it has been noted by GNATS.

From: =?UTF-8?B?SmFyb23DrXIgRG9sZcSNZWs=?= <jaromir.dolecek%gmail.com@localhost>
To: "gnats-bugs%NetBSD.org@localhost" <gnats-bugs%netbsd.org@localhost>
Cc: 
Subject: Re: port-xen/48125 dom0 panic during domU creation attempt
Date: Sat, 23 Jun 2018 17:25:38 +0200

 I experienced similar symtoms for xl destroy on 4.2.6, repeatable.
 
 1. xl create a DOMU with kernel which would crash during boot and drop into ddb
 2. detach from DOMU console using Ctrl-]
 3. xl destroy the DOMU
 
 Makes the DOM0 crash:
 [ 4759.4069454] xbd backend: detach device vnd0d for domain 4
 [ 4759.4569453] uvm_fault(0xffffffff80feb900, 0x0, 1) -> e
 [ 4759.4569453] fatal page fault in supervisor mode
 [ 4759.4569453] trap type 6 code 0 rip 0xffffffff8021bfae cs 0xe030
 rflags 0x10247 cr2 0 ilevel 0 rsp 0xffffa001765f8e38
 [ 4759.4569453] curlwp 0xffffa0001012b5a0 pid 0.39 lowest kstack 0xffffa001765f4
 2c0
 [ 4759.4569453] panic: trap
 [ 4759.4569453] cpu0: Begin traceback...
 [ 4759.4569453] ?() at ffffffff80882c18
 [ 4759.4569453] ?() at ffffffff80882cb8
 [ 4759.4569453] ?() at ffffffff8020b617
 [ 4759.4569453] ?() at ffffffff80204f0b
 [ 4759.4569453] ?() at ffffffff80229fb3
 [ 4759.4569453] ?() at ffffffff8022a441
 [ 4759.4569453] cpu0: End traceback...
 
 [ 4759.4569453] dumping to dev 4,1 (offset=0, size=0): not possible
 [ 4759.4569453] rebooting...