| Summary: | DAHLIN-00109: dahdi_dynamic_loc crashes as soon as a valid span pair is activated | ||
| Reporter: | Marcelo APacheco (mapacheco) | Labels: | |
| Date Opened: | 2009-05-27 22:27:50 | Date Closed: | 2009-06-26 12:22:47 |
| Priority: | Critical | Regression? | No |
| Status: | Closed/Complete | Components: | dahdi_dynamic_loc |
| Versions: | 2.1.0.4 | Frequency of Occurrence | |
| Related Issues: | |||
| Environment: | Attachments: | ||
| Description: | Sample /etc/dahdi/system.conf: dynamic=loc,1:0,24,0 dynamic=loc,1:1,24,0 bchan=1-23 dchan=24 bchan=25-47 dchan=48 mulaw=1-23,25-47 loadzone=us defaultzone=us modprobe dahdi_dummy dahdi_cfg -v My two systems get into a hard freeze (not even Alt-SysRq works), I already debugged and found the root of the issue, see below. If I comment all spinlock statements on dahdi_dynamic.c function dahdi_dynamic_receive, then it doesn't freeze. The underlying cause for the freeze we're having a recursive spinlock request, ztd_sendmessage calls ztdlocal_transmit which calls dahdi_dynamic_receive with dlock spinlock held. | ||
| Comments: | By: Tzafrir Cohen (tzafrir) 2009-06-06 14:58:31 any chance you could get the trace? e.g. get a screen shot of it? Is it legal for a local dynamic span not to point to a real span? By: Marcelo Pacheco (macpacheco) 2009-06-06 15:21:40 Dear tzafrir. I think you didn't compreehend the report, HARD FREEZE (NOT EVEN Alt-SysRq works). So there's no stack trace to be obtained. However I'm explaining what the issue is, with an extremely dirty hack that avoids the issue, so I know what the issue is, I just haven't engineered a solid solution. You can reproduce the issue in 5 mins, all you need is dahdi-linux and dahdi-tools compiled and installed, not even Asterisk is required. By: Digium Subversion (svnbot) 2009-06-26 12:22:46 Repository: dahdi Revision: 6771 U linux/trunk/drivers/dahdi/dahdi_dynamic.c ------------------------------------------------------------------------ r6771 | sruffell | 2009-06-26 12:22:45 -0500 (Fri, 26 Jun 2009) | 6 lines dahdi_dynamic: Release the dlock before calling accross modules. Resolves a hard lock due to a recursive spinlock grab at startup. Reported by: mapacheco (closes issue DAHLIN-109) ------------------------------------------------------------------------ http://svn.digium.com/view/dahdi?view=rev&revision=6771 | ||