[DragonFlyBSD - Bug #2444] Crash during Hammer overnight cleanup

["Justin C. Sherrill via Redmine" <bugtracker-admin@xxxxxxxxxxxxxxxxxxxxx>]

Issue #2444 has been reported by Justin C. Sherrill.

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Bug #2444: Crash during Hammer overnight cleanup
http://bugs.dragonflybsd.org/issues/2444

Author: Justin C. Sherrill
Status: New
Priority: Normal
Assignee: 
Category: 
Target version: 


I had a crash overnight.  It looks like it happened during batch cleanup on a busy Hammer disk.  This system has a separate PFS, /build, for doing bulk build work.  There's a ton of activity on the disk because of that bulk build, so I created that PFS and upped the cleaning times earlier in the day previous to this crash.  The bulk build was running at the time.

Dump at: leaf.dragonflybsd.org:~justin/20121004-dump.tgz (200M) Upload will complete about half an hour after this ticket is submitted.

uname: 

DragonFly  3.3-DEVELOPMENT DragonFly 181ede8-DEVELOPMENT #0: Wed Oct 24 15:19:15 MSD 2012     root@df64.v12.su:/usr/obj/home/justin/32/src/sys/X86_64_GENERIC  x86_64

(The bulk build was happening in a 3.2 chroot.)

The /build hammer config:

snapshots 0d 0d
prune     1d 50m
rebalance 1d 50m
dedup     1d 50m
reblock   1d 50m
recopy    30d 10m

Here's /var/log/messages from the relevant timeframe:

Nov  4 03:03:50  kernel: Warning: busy page 0xffffffe000b5f5a0 found in cache
Nov  4 03:05:27  kernel: HAMMER debug: shifted cursor pointing at parent
Nov  4 03:05:27  kernel: parent 8000000c7409e000:22 onode 8000000c7cf21000:0 nnode 8000000c6e14e000:20
Nov  4 03:13:14  kernel: Warning: busy page 0xffffffe000aac428 found in cache
Nov  4 03:13:14  kernel: Warning: busy page 0xffffffe003009ce8 found in cache
Nov  4 03:14:01  kernel:
Nov  4 03:15:47  syslogd: kernel boot file is /boot/kernel/kernel
Nov  4 03:15:47  kernel: Copyright (c) 2003-2012 The DragonFly Project.
Nov  4 03:15:47  kernel: Copyright (c) 1992-2003 The FreeBSD Project.



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