[cups] snmp backend started a job failed

[Helge Blischke]

The message concerning the snmp_fd that baffles you does *not* mean that
the SNMP backend has beed started. Instead, every network related backend
tries to open a snmp socket (in case the cusSNMPsupplies keyword is set to
true and thus needed).
The problem is apparently that the foomatic-rip filter exits with the abort
system call (signal 6 is SIGABORT). You should try to find out the reason for
this abortion.

> Am 24.07.2015 um 17:55 schrieb Alex Korobkin <korobkin+cups at gmail.com>:
> 
> Hi all,
> 
> I just noticed that a couple of failed jobs seem to have launched snmp
> backend for no apparent reason. One of them failed because foomatic-rip had
> crashed on signal 6. Another one failed because "Error reading back-channel
> data: Connection reset by peer."
> 
> Both have this line in the log:
> [Job X] backendWaitLoop(snmp_fd=5, addr=0x7..., side_cb=0x7...)
> 
> I checked the logs and found that this happens every time when a job fails
> with one of these errors.
> All my printers have cupsSNMPsupples set to False in the PPD.
> 
> Is this a bug, or does CUPS intentionally start snmp when a job fails?
> 
> 
> Typical end of a job log below:
> [Job 399799] Started filter pdftocairo (PID 5283)
> [Job 399799] Started filter pstops (PID 5284)
> [Job 399799] PID 5283 (pdftocairo) exited with no errors.
> [Job 399799] Page = 612x792; 12,12 to 600,780
> [Job 399799] slow_collate=0, slow_duplex=1, slow_order=0
> [Job 399799] Before copy_comments - %!PS-Adobe-3.0
> [Job 399799] %!PS-Adobe-3.0
> [Job 399799] %%Creator: cairo 1.14.2 (http://cairographics.org)
> [Job 399799] %%CreationDate: Wed Jul 22 20:45:01 2015
> [Job 399799] %%Pages: 2
> [Job 399799] %%DocumentData: Clean7Bit
> [Job 399799] %%LanguageLevel: 3
> [Job 399799] %%DocumentMedia: Letter 612 792 0 () ()
> [Job 399799] %%BoundingBox: 35 70 455 757
> [Job 399799] %%EndComments
> [Job 399799] Before copy_prolog - %%BeginProlog
> [Job 399799] Before copy_setup - %%BeginSetup
> [Job 399799] Before page loop - %%Page: 1 1
> [Job 399799] Copying page 1...
> [Job 399799] pagew = 588.0, pagel = 768.0
> [Job 399799] bboxx = 0, bboxy = 0, bboxw = 612, bboxl = 792
> [Job 399799] PageLeft = 12.0, PageRight = 600.0
> [Job 399799] PageTop = 780.0, PageBottom = 12.0
> [Job 399799] PageWidth = 612.0, PageLength = 792.0
> [Job 399799] Copying page 2...
> [Job 399799] PID 5280 (/usr/lib/cups/filter/foomatic-rip) crashed on
> signal 6.
> [Job 399799] Hint: Try setting the LogLevel to "debug" to find out more.
> [Job 399799] pagew = 588.0, pagel = 768.0
> [Job 399799] bboxx = 0, bboxy = 0, bboxw = 612, bboxl = 792
> [Job 399799] PageLeft = 12.0, PageRight = 600.0
> [Job 399799] PageTop = 780.0, PageBottom = 12.0
> [Job 399799] PageWidth = 612.0, PageLength = 792.0
> [Job 399799] Wrote 2 pages...
> [Job 399799] PID 5284 (pstops) exited with no errors.
> [Job 399799] PID 5279 (/usr/lib/cups/filter/pdftops) exited with no errors.
> [Job 399799] PID 5281 (/usr/lib/cups/backend/socket) exited with no errors.
> [Job 399799] backendWaitLoop(snmp_fd=5, addr=0x7f35d39f3d58,
> side_cb=0x7f35d28581d0)
> [Job 399799] End of messages
> [Job 399799] printer-state=3(idle)
> [Job 399799] printer-state-message="Filter failed"
> [Job 399799] printer-state-reasons=none
> [Job 399799] Stopping unresponsive job.
> 
> -- 
> -Alex
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