Description of problem: Sometimes, the ISDN channel is not freed after connection, resulting in that ISDN can't be no longer used. Version-Release number of selected component (if applicable): kernel-2.6.18-1.2869.fc6 isdn4k-utils-3.2-50 How reproducible: Sometimes Steps to Reproduce: 1. dial in to Linux box to ippp1 (single or dual channel) 2. hang up 3. retry 4. try to use ISDN on Linux box with minicom Actual results: Channels busy Expected results: Free channels Additional info: I do not know what happens, the only hint I see was a flashing green LED on the HiSaX card. After disabling the ISDN getty's from inittab and shutting down the ippp1 interface I was able to remove the hisax module. Here an interesting log entry shows up: Jan 15 22:27:33 server kernel: isdn: HiSax,ch0 cause: E001B Jan 15 22:27:58 server kernel: HiSax: debugging flags card 1 set to 3ff Jan 15 22:28:18 server kernel: isdn_free_channel: called with invalid drv(-1) or channel(-1) Jan 15 22:28:18 server kernel: isdn_free_channel: called with invalid drv(-1) or channel(-1) Jan 15 22:28:18 server kernel: ippp_ccp: freeing reset data structure da86e000 Jan 15 22:28:18 server kernel: ippp_ccp: freeing reset data structure dfd87800 I filed this bug against isdn4k-utils, but perhaps it's more a kernel problem.
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I'm currently no longer playing with ISDN links, so this issue can be closed for now as unresolved.