Re: __getcwd panics [lock held] (r193174, r193186)

On Thu, 2009-06-04 at 23:21 +0200, David Naylor wrote:
> Hi,
> 
> A recent change (r193174, r193186) in vfs_cache has been causing __getcwd to 
> panic the system.  The panic appears to trigger when I try install lang/ezm3 
> (with other things also happening).

Can you try this patch:

http://people.freebsd.org/~marcus/vfs_cache.c.diff

Joe

> 
> -- hand copied ---
> 
> System call _getcwd returning with the following locks held:
> shared rw Name Cache (Name Cache) r = 0 (0xc0eced7c) locked 
> _at_ /usr/src/sys/kern/vfs_cache.c:1104
> panic: witness_warn
> 
> --- above reproducible ---
> 
> cpuid = 2
> KDB: enter: panic
> [thread pid 23322 tid 100190 ]
> Stopped at kdb_enter+0x3a: movl $0, kdb_why
> db> cont
> Uptime 20m35s
> Physical memory: 3055 MB
> Dumping 271 MB: 256 240 224panic: bufwrite: buffer is not busy???
> cpuid = 0
> KDB: enter: panic
> [thread pid 25 tid 100055 ]
> Stopped at kdb_enter+0x3a: movl $0, kdb_why
> db> cont
> Uptime: 20m36s
> Automatic reboot in 15 seconds - press a key on the console to abort
> Rebooting...
> cpu_reset: Stopping other CPUs
> 
> --- systems hangs here, does nothing else ---
> --- hard reset ---
> 
> I reverst the change (and r193175) and the panic 'disappeared'.  
> 
> Willing to test patches.  
> 
> Regards,
> 
> David
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