Issue #3143 has been reported by cbin.

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Bug #3143: assertion "0" failed in hammer2_inode_xop_chain_sync
http://bugs.dragonflybsd.org/issues/3143

* Author: cbin
* Status: New
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
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This happened on DragonFly 5.2.2  

chain 00000000441da00a.01 key=0000000000008641 meth=30 CHECK FAIL 
(flags=00140002, bref/data 830e0b4c1fbfa512/9f5e0aac2b2788b2)
panic: assertion "0" failed in hammer2_inode_xop_chain_sync at 
/usr/src/sys/vfs/hammer2/hammer2_inode.c:1775 
cpuid = 0
Trace beginning at frame 0xfffff9008a525920
panic() at panic+0x236 0xffffffff805f8666
panic() at panic+0x236 0xffffffff805f8666
hammer2_inode_xop_chain_sync() at hammer2_inode_xop_chain_sync+0x249 
0xffffffff808bfde9
hammer2_primary_xops_thread() at hammer2_primary_xops_thread+0x26b 
0xffffffff808be0fb
Debugger("panic") 

This machine is mostly idle, except for once an hour (at 10 minutes to the 
hour) a dovecot backup is synced to it and on the hour it creates a snapshot of 
the pfs with the dovecot backup.

It came back up with no problems and it *seems* to work okay, but now there are 
hundreds errors like the following appearing: 

Jul 17 15:43:14 archivist kernel: CHILD ERROR DURING FLUSH LOCK 
0xfffff8009abb9420->0xfffff8009c118ca0
Jul 17 15:43:14 archivist kernel: chain 00000000441da40a.01 
key=0000000000008639 meth=30 CHECK FAIL (flags=0114c002, bref/data 
80bb95a42ef6c177/4762378c10af65e7)
Jul 17 15:43:14 archivist kernel: CHILD ERROR DURING FLUSH LOCK 
0xfffff8009abb9420->0xfffff8009c11b0a0
Jul 17 15:43:14 archivist kernel: chain 00000000441da80a.01 
key=000000000000863f meth=30 CHECK FAIL (flags=0114c002, bref/data 
6c75050e70b2327a/1e4bf80cd16e453b)
Jul 17 15:43:14 archivist kernel: CHILD ERROR DURING FLUSH LOCK 
0xfffff8009abb9420->0xfffff8009c118ca0 

This on a vultr VM. The disk is small but there is plenty of space available: 

Filesystem              Size   Used  Avail Capacity  Mounted on
/dev/mapper/root@DATA  21.6G  4469M  17.2G    20%    /
/dev                   1024B  1024B     0B   100%    /dev
/dev/vbd0s1a           1022M   467M   473M    50%    /boot
/build/usr.obj         21.6G  4469M  17.2G    20%    /usr/obj
/build/var.crash       21.6G  4469M  17.2G    20%    /var/crash
/build/var.cache       21.6G  4469M  17.2G    20%    /var/cache
/build/var.spool       21.6G  4469M  17.2G    20%    /var/spool
/build/var.log         21.6G  4469M  17.2G    20%    /var/log
/build/var.tmp         21.6G  4469M  17.2G    20%    /var/tmp
tmpfs                   233M  12.0K   233M     0%    /tmp
procfs                 4096B  4096B     0B   100%    /proc
@var.vmail             21.6G  4469M  17.2G    20%    /var/vmail 



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