Date: Thu, 3 Jul 2008 22:38:56 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: Doug Barton <dougb@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: Panic using rsync to msdosfs filesystem Message-ID: <20080703193856.GS17123@deviant.kiev.zoral.com.ua> In-Reply-To: <486BFFE5.1010808@FreeBSD.org> References: <486BFFE5.1010808@FreeBSD.org>
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On Wed, Jul 02, 2008 at 03:23:33PM -0700, Doug Barton wrote:
> I have a western digital passport USB hard drive that I use for=20
> backups. It's always worked fine in FreeBSD and Windows doing straight=20
> copies. Today I tried to get fancy and use rsync and it blew up on me.
>=20
> It is a large disk (160G) and I use the following options in fstab:
> /dev/da0s1 /mnt/wd msdosfs rw,noauto,-olarge,-m775 0 0
>=20
> Using the following command line for rsync I get a panic as soon as I=20
> hit return: rsync -vv --backup -u -rlt source/ destination/
>=20
> I'm using -current as of r180191. Here is the stack trace:
> Unread portion of the kernel message buffer:
> panic: stack overflow detected; backtrace may be corrupted
> cpuid =3D 1
> Uptime: 1h52m1s
> Physical memory: 2029 MB
> Dumping 133 MB: 118 102 86 70 54 38 22 6
>=20
> Reading symbols from /boot/modules/nvidia.ko...Reading symbols from=20
> /boot/modules/nvidia.ko.symbols...done.
> done.
> Loaded symbols for /boot/modules/nvidia.ko
> Reading symbols from /boot/kernel/acpi.ko...Reading symbols from=20
> /boot/kernel/acpi.ko.symbols...done.
> done.
> Loaded symbols for /boot/kernel/acpi.ko
> Reading symbols from /boot/kernel/if_bge.ko...Reading symbols from=20
> /boot/kernel/if_bge.ko.symbols...done.
> done.
> Loaded symbols for /boot/kernel/if_bge.ko
> Reading symbols from /boot/kernel/linux.ko...Reading symbols from=20
> /boot/kernel/linux.ko.symbols...done.
> done.
> Loaded symbols for /boot/kernel/linux.ko
> Reading symbols from /boot/kernel/msdosfs.ko...Reading symbols from=20
> /boot/kernel/msdosfs.ko.symbols...done.
> done.
> Loaded symbols for /boot/kernel/msdosfs.ko
> #0 doadump () at pcpu.h:196
> 196 __asm __volatile("movl %%fs:0,%0" : "=3Dr" (td));
> (kgdb) where
> #0 doadump () at pcpu.h:196
> #1 0xc057a9ce in boot (howto=3D260)
> at /usr/local/src/sys/kern/kern_shutdown.c:418
> #2 0xc057ac93 in panic (fmt=3DVariable "fmt" is not available.
> ) at /usr/local/src/sys/kern/kern_shutdown.c:572
> #3 0xc059c5b2 in __stack_chk_fail ()
> at /usr/local/src/sys/kern/stack_protector.c:17
> #4 0xc652384a in msdosfs_rename (ap=3D0xc644aca4)
> at=20
> /usr/local/src/sys/modules/msdosfs/../../fs/msdosfs/msdosfs_vnops.c:1286
> #5 0xc07b4df5 in VOP_RENAME_APV (vop=3D0xc6525cc0, a=3D0xe9e59c1c)
> at vnode_if.c:1184
> #6 0xc0605619 in kern_renameat (td=3D0xc58f1d20, oldfd=3D-100,
> old=3D0xbfbfc4a0 <Address 0xbfbfc4a0 out of bounds>, newfd=3D-100,
> new=3D0xbfbfcca0 <Address 0xbfbfcca0 out of bounds>,=20
> pathseg=3DUIO_USERSPACE)
> at vnode_if.h:622
> #7 0xc06057a6 in kern_rename (td=3D0xc58f1d20,
> from=3D0xbfbfc4a0 <Address 0xbfbfc4a0 out of bounds>,
> to=3D0xbfbfcca0 <Address 0xbfbfcca0 out of bounds>,=20
> pathseg=3DUIO_USERSPACE)
> at /usr/local/src/sys/kern/vfs_syscalls.c:3526
> #8 0xc06057d9 in rename (td=3D0xc58f1d20, uap=3D0xe9e59cf8)
> at /usr/local/src/sys/kern/vfs_syscalls.c:3503
> #9 0xc07a6283 in syscall (frame=3D0xe9e59d38)
> at /usr/local/src/sys/i386/i386/trap.c:1081
> #10 0xc078bb80 in Xint0x80_syscall ()
> at /usr/local/src/sys/i386/i386/exception.s:261
> #11 0x00000033 in ?? ()
> Previous frame inner to this frame (corrupt stack?)
>=20
>=20
> Let me know what I can do to help.
Looks like this is the first casuality of the -fstack-protector.
Try this:
diff --git a/sys/fs/msdosfs/msdosfs_vnops.c b/sys/fs/msdosfs/msdosfs_vnops.c
index 8a1484f..fe673e0 100644
--- a/sys/fs/msdosfs/msdosfs_vnops.c
+++ b/sys/fs/msdosfs/msdosfs_vnops.c
@@ -982,7 +982,7 @@ msdosfs_rename(ap)
struct componentname *tcnp =3D ap->a_tcnp;
struct componentname *fcnp =3D ap->a_fcnp;
struct denode *ip, *xp, *dp, *zp;
- u_char toname[11], oldname[11];
+ u_char toname[12], oldname[11];
u_long from_diroffset, to_diroffset;
u_char to_count;
int doingdirectory =3D 0, newparent =3D 0;
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