On 8/5/2014 10:19 PM, Konstantin Belousov wrote:
On Tue, Aug 05, 2014 at 09:47:57PM -0500, Bryan Drewery wrote:
Has anyone else encountered this? Got it while running poudriere.

NULL mp in getnewvnode()
vn_fullpath1() at vn_fullpath1+0x19d/frame 0xfffffe1247d8e540
vn_fullpath() at vn_fullpath+0xc1/frame 0xfffffe1247d8e590
export_fd_to_sb() at export_fd_to_sb+0x489/frame 0xfffffe1247d8e7c0
kern_proc_filedesc_out() at kern_proc_filedesc_out+0x234/frame 
sysctl_kern_proc_filedesc() at sysctl_kern_proc_filedesc+0x84/frame 
sysctl_root_handler_locked() at sysctl_root_handler_locked+0x68/frame 
sysctl_root() at sysctl_root+0x18e/frame 0xfffffe1247d8e990
userland_sysctl() at userland_sysctl+0x192/frame 0xfffffe1247d8ea30
sys___sysctl() at sys___sysctl+0x74/frame 0xfffffe1247d8eae0
amd64_syscall() at amd64_syscall+0x25a/frame 0xfffffe1247d8ebf0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe1247d8ebf0

Unfortunately I have no dump as the kmem was too large compared to my
swap, and I didn't get to the console before some of the text was
overwritten. Perhaps it will hit it again soon after reboot and I'll get
a core.

"NULL mp in getnewvnode()" is only the printf(), it is not a panic or
KASSERT.  The event does not stop the machine, nor it prints the

You mentioned that you was unable to dump, so did the system paniced ?
Without full log of the panic messages and backtrace, it is impossible
to start guessing what the problem is.

That said, the printf seemingly outlived its usefulness.

Got it. I've set debug.debugger_on_panic=1 to not auto reboot on panic next time this happens. I had it at 0 which was causing the lack of information in these.

Off-topic, this system has 72gb of ram, 16gb swap. I suspect ZFS ARC is typically filling up kmem too much to create a dump. I've limited it to 50gb but am not fond of limiting it, or kmem, to under 16gb. I see that if a page is allocated with VM_ALLOC_NODUMP -> PG_NODUMP then it will be excluded from minidumps. It looks like ZFS allocates all of its kmem via malloc(9) (zfs_kmem_alloc) though which has no means to pass these flags down to the vm system. I am guessing ZFS would need dedicated vm pages for this to even make sense though. I suppose I am stuck in this situation unless I limit kmem or raise my swap size.

Bryan Drewery
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