ports/120021: net-p2p/qbittorrent crashes system when it works though OpenVPN link

[Alexander Shiryaev]

>Number:         120021
>Category:       ports
>Synopsis:       net-p2p/qbittorrent crashes system when it works though OpenVPN link
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-ports-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Jan 26 21:50:02 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     Alexander Shiryaev
>Release:        6.3-STABLE
>Organization:
MSU
>Environment:
FreeBSD aix-lame.hackers 6.3-STABLE FreeBSD 6.3-STABLE #0: Sat Jan 26 15:42:57 MSK 2008 root at aix-lame.hackers:/usr/obj/usr/src/sys/GENERIC i386
>Description:
qbittorrent crashes system when it works though Internet connection configured with OpenVPN.

aix-lame# kgdb kernel.debug /usr/obj/fbsd/crash/vmcore.5
kgdb: kvm_nlist(_stopped_cpus): 
kgdb: kvm_nlist(_stoppcbs): 
[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
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This GDB was configured as "i386-marcel-freebsd".

Unread portion of the kernel message buffer:
panic: add_to_worklist: already on list
Uptime: 7m2s
Dumping 255 MB (2 chunks)
  chunk 0: 1MB (159 pages) ... ok
  chunk 1: 255MB (65280 pages) 240 224 208 192 176 160 144 128 112 96 80 64 48 32 16

#0  doadump () at pcpu.h:165
165		__asm __volatile("movl %%fs:0,%0" : "=r" (td));
(kgdb) list
160	static __inline struct thread *
161	__curthread(void)
162	{
163		struct thread *td;
164	
165		__asm __volatile("movl %%fs:0,%0" : "=r" (td));
166		return (td);
167	}
168	#define	curthread (__curthread())
169	
(kgdb) backtrace
#0  doadump () at pcpu.h:165
#1  0xc0704b02 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:409
#2  0xc0704e0c in panic (fmt=0xc0a4a153 "add_to_worklist: already on list")
    at /usr/src/sys/kern/kern_shutdown.c:565
#3  0xc0887bc4 in add_to_worklist (wk=0xc28f47a0)
    at /usr/src/sys/ufs/ffs/ffs_softdep.c:811
#4  0xc088fcfe in handle_written_filepage (pagedep=0xc2801900, bp=0xc7538d68)
    at /usr/src/sys/ufs/ffs/ffs_softdep.c:4757
#5  0xc088f0b9 in softdep_disk_write_complete (bp=0xc7538d68)
    at /usr/src/sys/ufs/ffs/ffs_softdep.c:4247
#6  0xc075b8df in bufdone (bp=0xc7538d68) at buf.h:440
#7  0xc06c0a8e in g_vfs_done (bip=0x0) at /usr/src/sys/geom/geom_vfs.c:87
#8  0xc075b55b in biodone (bp=0xc2ba15ac) at /usr/src/sys/kern/vfs_bio.c:2930
#9  0xc06be3ef in g_io_schedule_up (tp=0xc254ad80)
    at /usr/src/sys/geom/geom_io.c:490
#10 0xc06be6a6 in g_up_procbody () at /usr/src/sys/geom/geom_kern.c:95
#11 0xc06e95e5 in fork_exit (callout=0xc06be62c <g_up_procbody>, arg=0x0, 
    frame=0x0) at /usr/src/sys/kern/kern_fork.c:788
#12 0xc09a413c in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:208
(kgdb) quit
>How-To-Repeat:
* Configure Internet connection though OpenVPN
* Run qbittorrent, start some torrent to download
* Wait some time

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: