https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235439
Bug ID: 235439
Summary: sync(8) hanged in D+ state after more swap space was
added
Product: Base System
Version: 11.2-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
I ran out of swap state, so I added more swap (md98 none swap
sw,file=/thedisk/swap,late 0 0), swapon -aL. At this time these swap_pager
messages appeared:
> Feb 2 09:00:00 yv newsyslog[23791]: logfile turned over due to size>100K
> Feb 2 09:03:09 yv kernel: pid 23931 (chrome), uid 1001: exited on signal 10
> Feb 2 09:03:34 yv kernel: swap_pager: indefinite wait buffer: bufobj: 0,
> blkno: 1049391, size: 8192
> Feb 2 09:03:34 yv kernel: swap_pager: indefinite wait buffer: bufobj: 0,
> blkno: 1049444, size: 8192
> Feb 2 09:04:03 yv kernel: swap_pager: indefinite wait buffer: bufobj: 0,
> blkno: 1048721, size: 4096
> Feb 2 09:04:03 yv kernel: swap_pager: indefinite wait buffer: bufobj: 0,
> blkno: 1063141, size: 8192
> Feb 2 09:04:03 yv kernel: swap_pager: indefinite wait buffer: bufobj: 0,
> blkno: 1049652, size: 4096
> Feb 2 09:04:38 yv kernel: swap_pager: indefinite wait buffer: bufobj: 0,
> blkno: 1048880, size: 16384
> Feb 2 09:04:38 yv kernel: swap_pager: indefinite wait buffer: bufobj: 0,
> blkno: 1049638, size: 4096
> Feb 2 09:04:38 yv kernel: swap_pager: indefinite wait buffer: bufobj: 0,
> blkno: 1062692, size: 12288
> Feb 2 09:04:38 yv kernel: swap_pager: indefinite wait buffer: bufobj: 0,
> blkno: 1068865, size: 8192
> Feb 2 09:04:41 yv kernel: swap_pager: indefinite wait buffer: bufobj: 0,
> blkno: 1078142, size: 45056
> Feb 2 09:04:46 yv kernel: swap_pager: indefinite wait buffer: bufobj: 0,
> blkno: 1049896, size: 4096
> Feb 2 09:04:51 yv kernel: swap_pager: indefinite wait buffer: bufobj: 0,
> blkno: 1079764, size: 61440
> Feb 2 09:28:20 yv kernel: Limiting closed port RST response from 295 to 200
> packets/sec
> Feb 2 10:31:41 yv kernel: Limiting closed port RST response from 234 to 200
> packets/sec
Soon after, I manually ran sync(8) and sync froze in D+ state:
> $ ps ax | grep sync
> 22 - DL 28:57.73 [syncer]
> 40832 7 D+ 0:00.08 sync
> 88531 9 S+ 0:00.00 grep sync
Please feel free to close it if you think this isn't actionable. But I thought
I should report this, because now this system needs to be rebooted to get rid
of that process with pid=40832.
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