Ufs dead-locks on freebsd 6.2

[Kostik Belousov]

On Thu, May 17, 2007 at 01:03:37PM -0400, Andrew Edwards wrote:
> Here it is.
> 
> db> show vnode 0xccd47984
> vnode 0xccd47984: tag ufs, type VDIR
>     usecount 5135, writecount 0, refcount 5137 mountedhere 0
>     flags (VV_ROOT)
>     v_object 0xcd02518c ref 0 pages 1
>     #0 0xc0593f0d at lockmgr+0x4ed
> #1 0xc06b8e0e at ffs_lock+0x76
> #2 0xc0739787 at VOP_LOCK_APV+0x87
> #3 0xc0601c28 at vn_lock+0xac
> #4 0xc05ee832 at lookup+0xde
> #5 0xc05ee4b2 at namei+0x39a
> #6 0xc05e2ab0 at unp_connect+0xf0
> #7 0xc05e1a6a at uipc_connect+0x66
> #8 0xc05d9992 at soconnect+0x4e
> #9 0xc05dec60 at kern_connect+0x74
> #10 0xc05debdf at connect+0x2f
> #11 0xc0723e2b at syscall+0x25b
> #12 0xc070ee0f at Xint0x80_syscall+0x1f
> 
>         ino 2, on dev amrd0s1a 
It seems to be the sort of things that cannot happen. VOP_LOCK()
returned 0, but vnode was not really locked.

Although claiming that kernel code cannot have such bug is too optimistic,
I would first make sure that:
1. You checked the memory of the machine.
2. Your kernel is built from pristine sources.

> 
> > -----Original Message-----
> > From: Kostik Belousov [mailto:kostikbel at gmail.com] 
> > Sent: Thursday, May 17, 2007 1:01 PM
> > To: Andrew Edwards
> > Cc: freebsd-performance at freebsd.org; freebsd-fs at freebsd.org
> > Subject: Re: Ufs dead-locks on freebsd 6.2
> > 
> > On Thu, May 17, 2007 at 11:44:15AM -0400, Andrew Edwards wrote:
> > >  I've upgraded to 6-stable, added the kernel options as per 
> > the kernel 
> > > handbook.  After about 5 hours of they system in a deadlock 
> > it panic'd.
> > > Here's the backtrace, and show pcpu, show allpcpu, show locks, show 
> > > alllocks, show lockedvnods and alltrace.
> > > 
> > > I will have the system down for approx another 15-20mins if there's 
> > > anything else someone would like while I'm in the debugger.
> > > 
> > > 
> > > db> bt
> > > Tracing pid 46784 tid 105112 td 0xd44a8000
> > > kdb_enter(c0785f13) at kdb_enter+0x2b
> > > vfs_badlock(c0785f2c,c0786051,ccd47984) at vfs_badlock+0x47
> > > assert_vop_locked(ccd47984,c0786051) at assert_vop_locked+0x4a
> > > vop_lock_post(f9f709dc,0,1002,ccd47984,f9f709f8,...) at 
> > > vop_lock_post+0x2a
> > > VOP_LOCK_APV(c07dc2e0,f9f709dc) at VOP_LOCK_APV+0xa0
> > > vn_lock(ccd47984,1002,d44a8000) at vn_lock+0xac
> > > lookup(f9f70c08) at lookup+0xde
> > > namei(f9f70c08) at namei+0x39a
> > > unp_connect(d44b2de8,d44dc380,d44a8000,d44b2de8,25,...) at 
> > > unp_connect+0xf0
> > > uipc_connect(d44b2de8,d44dc380,d44a8000) at uipc_connect+0x66
> > > soconnect(d44b2de8,d44dc380,d44a8000) at soconnect+0x4e
> > > kern_connect(d44a8000,7,d44dc380,d44dc380,0,...) at 
> > kern_connect+0x74
> > > connect(d44a8000,f9f70d04) at connect+0x2f
> > > syscall(3b,805003b,bfbf003b,bfbfd920,bfbfd922,...) at syscall+0x25b
> > > Xint0x80_syscall() at Xint0x80_syscall+0x1f
> > 
> > Could you, please, do the "show vnode 0xccd47984" from ddb 
> > prompt or "p/x *(struct vnode *)0xccd47984" from kgdb using 
> > dump for this panic ?
> > 
> > Side note: it seems that on HEAD, vnode_if.awk does not 
> > generate call to vop_lock_{pre,post} due to mismatch in the 
> > name of vop and pre/post names.
> > 
> > 
> > 
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