kern/182739: fusefs-kmod kernel panic on rsync

[Luke]

>Number:         182739
>Category:       kern
>Synopsis:       fusefs-kmod kernel panic on rsync
>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:   Sun Oct 06 09:40:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Luke
>Release:        9.1-RELEASE, 9.1-RELEASE
>Organization:
>Environment:
FreeBSD xxxxxxx 9.1-RELEASE-p7 FreeBSD 9.1-RELEASE-p7 #0: Mon Sep  9 21:34:37 UTC 2013     root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

>Description:
There is a problem with fusefs-kmod and FreeBSD 9.1 and rsync. While starting rsync on fuse share, one encounters kernel panic with:

fuse4bsd: version 0.3.9-pre1, FUSE ABI 7.19


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address       = 0x0
fault code                           = supervisor read instruction, page not present
instruction pointer         = 0x20:0x0
stack pointer             = 0x28:0xffffff811b71bac0
frame pointer           = 0x28:0xffffff811b71bb10
code segment                  = base 0x0, limit 0xfffff, type 0x1b
                                               = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags              = interrupt enabled, resume, IOPL = 0
current process                               = 16502 (rsync)
trap number                     = 12
panic: page fault
cpuid = 0
KDB: stack backtrace:
#0 0xffffffff80920bb6 at kdb_backtrace+0x66
#1 0xffffffff808eabce at panic+0x1ce
#2 0xffffffff80bd8640 at trap_fatal+0x290
#3 0xffffffff80bd897d at trap_pfault+0x1ed
#4 0xffffffff80bd8f9e at trap+0x3ce
#5 0xffffffff80bc355f at calltrap+0x8
#6 0xffffffff80bd7ee6 at amd64_syscall+0x546
#7 0xffffffff80bc3847 at Xfast_syscall+0xf7
Uptime: 21h22m6s
Dumping 847 out of 4043 MB:..2%..12%..21%..31%..42%..51%..61%..72%..82%..91%


Same result can be obtained on FreeBSD 9.2

Might be related to http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/175328
>How-To-Repeat:
rsync on any fuse'd directory
>Fix:


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