Date: Thu, 6 Sep 2007 18:23:14 GMT From: Joshua Isom <jrisom@gmail.com> To: freebsd-gnats-submit@FreeBSD.org Subject: amd64/116159: Panic while debugging on CURRENT Message-ID: <200709061823.l86INEsk043752@www.freebsd.org> Resent-Message-ID: <200709061830.l86IU1LI082230@freefall.freebsd.org>
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>Number: 116159 >Category: amd64 >Synopsis: Panic while debugging on CURRENT >Confidential: no >Severity: critical >Priority: low >Responsible: freebsd-amd64 >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Thu Sep 06 18:30:01 GMT 2007 >Closed-Date: >Last-Modified: >Originator: Joshua Isom >Release: CURRENT kernel, STABLE userland >Organization: >Environment: FreeBSD freebsd 7.0-CURRENT FreeBSD 7.0-CURRENT #0: Wed Sep 5 06:32:03 CDT 2007 root@freebsd:/usr/obj/usr/src/sys/GENERIC amd64 >Description: When I use a 6-STABLE userland with a 7-CURRENT kernel(for support for my dvd drive), I can predictably cause a panic in the kernel while debugging a program, and all as a non root user. Looking at the coredump seems to provide no information but once it paniced I was able to get this information. kdb_enter() at kdb_enter+0x31 panic() at panic+0x173 postsig() at postsig+0x155 thread_export_context() at thread_export_context+0x1c7 thread_userret() at thread_userret+0x481 userret() at userret+0xfb trap() at trap+0x22d calltrap() at calltrap+0x8 trap 0xc, rip=0xdc0038, rsp=0x7fffffffe730, rbp=0x7fffffffee760 The way I cause this is to debug a program that segfaults, and type in "next" or a similar command into gdb. When I tried upgrading to a full CURRENT system, debugging anything seemed to be broken(one command would become zombied and I couldn't figure out which). I don't have any problems with debugging with a 6-STABLE system. >How-To-Repeat: $ gdb foo > run program went boom > next kernel goes boom >Fix: Unknown, but everything works in 6-STABLE. >Release-Note: >Audit-Trail: >Unformatted:home | help
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