Date: Mon, 18 Jul 2011 17:18:25 GMT From: Alex Samorukov <samm@os2.kiev.ua> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/159013: kldunload dtraceall crashing if userland dtrace provider is in use Message-ID: <201107181718.p6IHIPlU025224@red.freebsd.org> Resent-Message-ID: <201107181720.p6IHKF5J091353@freefall.freebsd.org>
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>Number: 159013 >Category: kern >Synopsis: kldunload dtraceall crashing if userland dtrace provider is in use >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Mon Jul 18 17:20:14 UTC 2011 >Closed-Date: >Last-Modified: >Originator: Alex Samorukov >Release: FreeBSD-STABLE >Organization: netart >Environment: FreeBSD bsd.home 8.2-STABLE FreeBSD 8.2-STABLE #3: Fri Jul 15 21:22:54 UTC 2011 root@bsd.home:/usr/obj/usr/src/sys/DTRACE amd64 >Description: I found that kldunload dtracell causing kernel crash if userland providers are in use. >How-To-Repeat: 1) Compile kernel with DTRACE support on -STABLE. 2) Run program acting as userland provider. I am using mod_php + apache for this, see ports/158983 for the source. 3) Load module (kldload dtraceall) 4) start the web server to initialize the provider. 5) Do kldunload dtraceall. System will panic. bsd# head -n 31 core.txt.0 bsd.home dumped core - see /var/crash/vmcore.0 Mon Jul 18 22:10:40 UTC 2011 FreeBSD bsd.home 8.2-STABLE FreeBSD 8.2-STABLE #3: Fri Jul 15 21:22:54 UTC 2011 root@bsd.home:/usr/obj/usr/src/sys/DTRACE amd64 panic: double fault GNU gdb 6.1.1 [FreeBSD] Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "amd64-marcel-freebsd"... Unread portion of the kernel message buffer: Fatal double fault rip = 0xffffffff808f2cf8 rsp = 0xffffff8126aa8f60 rbp = 0xffffff8126aa90e0 cpuid = 0; apic id = 00 panic: double fault cpuid = 0 KDB: stack backtrace: #0 0xffffffff8062d78e at kdb_backtrace+0x5e #1 0xffffffff805f8d17 at panic+0x187 #2 0xffffffff808f2494 at dblfault_handler+0xa4 #3 0xffffffff808daced at Xdblfault+0xad Uptime: 2m18s 6) if i`m unloading httpd before kldunload everything is fine. I think this bug is not critical, but needs to be fixed. >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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