NetBSD Problem Report #53557
From gson@gson.org Mon Aug 27 14:39:42 2018
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Date: Mon, 27 Aug 2018 17:39:36 +0300 (EEST)
From: gson@gson.org (Andreas Gustafsson)
Reply-To: gson@gson.org (Andreas Gustafsson)
To: gnats-bugs@NetBSD.org
Subject: NetBSD 7.1.2 Xen dom0 panics on unclean shutdown
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>Number: 53557
>Category: port-xen
>Synopsis: NetBSD 7.1.2 Xen dom0 panics on unclean shutdown
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: port-xen-maintainer
>State: closed
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Mon Aug 27 14:40:00 +0000 2018
>Closed-Date: Fri Jul 17 11:12:08 +0000 2020
>Last-Modified: Fri Jul 17 11:12:08 +0000 2020
>Originator: Andreas Gustafsson
>Release: NetBSD 7.1.2
>Organization:
>Environment:
System: NetBSD
Architecture: x86_64
Machine: amd64
>Description:
When I tried to "halt -p" a NetBSD 7.1.1/amd64 Xen dom0 that I had set
up for testing and that still had some test domUs running off vnd
devices, not caring about doing a clean shutdown because I was going
to wipe the system anyway, it paniced during shutdown and rebooted
instead of powering off like I had asked it to.
Console output from around the panic:
vnd2: detached
vnd1: detached
vnd0: detached
fatal integer divide fault in supervisor mode
trap type 8 code 0 rip ffffffff806f8fcd cs e030 rflags 10293 cr2 7f7ff25570c8 ilevel 0 rsp ffffa0001c01de58
curlwp 0xffffa00000ed8520 pid 0.77 lowest kstack 0xffffa0001c01b2c0
Skipping crash dump on recursive panic
panic: trap
cpu0: Begin traceback...
vpanic() at netbsd:vpanic+0x13c
snprintf() at netbsd:snprintf
startlwp() at netbsd:startlwp
alltraps() at netbsd:alltraps+0x9f
cpu0: End traceback...
rebooting...
(XEN) Hardware Dom0 shutdown: rebooting machine
Identifying the faulting instruction:
# gunzip /netbsd-XEN3_DOM0.gz
# gdb /netbsd-XEN3_DOM0
(gdb) x/i 0xffffffff806f8fcd
0xffffffff806f8fcd <vndthread+703>: idivq -0x58(%rbp)
A bit of context leading up to the faulting instruction:
0xffffffff806f8fa5 <vndthread+663>: callq 0xffffffff806fb143 <VOP_STRATEGY>
0xffffffff806f8faa <vndthread+668>: add %rbx,%r12
0xffffffff806f8fad <vndthread+671>: sub %rbx,%r13
0xffffffff806f8fb0 <vndthread+674>: add %rbx,%r14
0xffffffff806f8fb3 <vndthread+677>: movl $0x0,-0x3c(%rbp)
0xffffffff806f8fba <vndthread+684>: mov 0x18(%r15),%rdi
0xffffffff806f8fbe <vndthread+688>: mov $0x20002,%esi
0xffffffff806f8fc3 <vndthread+693>: callq 0xffffffff806eeabc <vn_lock>
0xffffffff806f8fc8 <vndthread+698>: mov %r12,%rax
0xffffffff806f8fcb <vndthread+701>: cqto
0xffffffff806f8fcd <vndthread+703>: idivq -0x58(%rbp)
This is reproducible. Perhaps I got what I deserved doing an unclean
shutdown, but I'm reporting it anyway (as a low priority issue) in
case someone cares.
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->closed
State-Changed-By: jdolecek@NetBSD.org
State-Changed-When: Fri, 17 Jul 2020 11:12:08 +0000
State-Changed-Why:
Unable to reproduce with -current.
>Unformatted:
(Contact us)
$NetBSD: query-full-pr,v 1.46 2020/01/03 16:35:01 leot Exp $
$NetBSD: gnats_config.sh,v 1.9 2014/08/02 14:16:04 spz Exp $
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