mutex Giant not owned at /usr/src/sys/kern/vfs_vnops.c:120

Gleb Smirnoff glebius at
Mon Aug 30 07:40:44 PDT 2004

On Mon, Aug 30, 2004 at 10:35:05AM -0400, Robert Watson wrote:
R> > B> > This causes Giant to be acquired in the event we enter the linker code
R> > B> > (and hence VFS code) via netgraph ngc_send().  It should be safe in this
R> > B> > context as we enter protocol send routines without mutexes held (i.e., why
R> > B> > we're also able to do blocking memory allocation here.)
R> > B> 
R> > B> please commit.
R> > 
R> > I think Giant should be acquired in linker_load_module(), and this way
R> > we will prevent this panic in other codepaths. For example in
R> > vfs_mount.c, when vfs will be Giant-free. Have I missed something?
R> Well, one of the primary reasons the linker needs Giant here is its use of
R> VFS.  I think for now I'd like to acquire Giant in netgraph so as to
R> expose the use of Giant in that piece of the network stack in the calling
R> code.  We might want to add GIANT_REQUIRED assertions in the linker code
R> to make sure we trigger assertions even if the linker doesn't hit VFS to
R> make sure potentially hitting Giant is caught.

OK. Then commit it pls.

Totus tuus, Glebius.

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