Date: Fri, 27 Apr 2012 14:50:40 GMT From: Eric Crews <eric.crews@gmail.com> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/167362: Reproduceble Page Fault when running rsync over sshfs/encfs. Message-ID: <201204271450.q3REoeFl037290@red.freebsd.org> Resent-Message-ID: <201204271500.q3RF0O61051724@freefall.freebsd.org>
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>Number: 167362
>Category: misc
>Synopsis: Reproduceble Page Fault when running rsync over sshfs/encfs.
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Apr 27 15:00:24 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator: Eric Crews
>Release: 9.0-RELEASE
>Organization:
>Environment:
FreeBSD 9.0-RELEASE FreeBSD 9.0-RELEASE #0: Tue Jan 3 07:46:30 UTC 2012
root@farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
>Description:
I mount a directory from a remote server via sshfs to my zpool partition. Next I open an encrypted container in the sshfs mounted directory with encfs. Finally, when I attempt to rsync data into the unencrypted encfs mounted container the system immediately throws a Page Fault and totally freezes up. Even the core dump fails to complete. This is all the information( from the terminal screen ) of the fault I have.
****************************************************
Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address = 0x0
fault code = supervisor read instruction, page not present
instruction pointer = 0x20 :0x0
stack pointer = 0x28 :0xffffff80559cdad0
frame pointer = 0x28 :0xffffff80559cdb20
code segment = base 0x0, limit 0xffffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 1632 (rsync)
trap number = 12
panic: page fault
cupid = 1
KDB: stack backtrace:
#0 0xffffffff808680fe at kdb_backtrace+0x5e
#1 0xffffffff80832cb7 at panic+0x187
#2 0xffffffff80b18400 at trap_fatal+0x290
#3 0xffffffff80b18749 at trap_pfault+0x1f9
#4 0xffffffff80b18c0f at trap+0x3df
#5 0xffffffff80b0313f at calltrap+0x8
#6 0xffffffff80b17cf0 at amd64_syscall+0x450
#7 0xffffffff80b03427 at Zfast_syscall+0xf7
**********************************************************
I have tried this on both a zpool and a zpool on top of geli containers and gotten the same page fault every time.
I have previously done this same procedure on Ubuntu and Gentoo servers with no problems.
>How-To-Repeat:
sshfs <user>@<remote Server>:/home/<user> /mnt/archive
encfs -S /mnt/archive/.crypt /archive
rsync -avzqrpogtu /stuff /archive
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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