Re: zfs/unionfs panic on last night's -current

<facepalm>

I forgot the command that triggers the panic! My apologies.

# cd /jails/jail1
# rmdir proc

panic!

The jail is not running, no procfs is mounted.


On Wed, Sep 02, 2015 at 10:41:57AM -0400, Michael W. Lucas wrote:
> Hi,
> 
> I'm experimenting with unionfs for my next FreeBSD book, and found a
> reproducible panic. I haven't needed to report a panic for... uh... I
> don't think I've done it this century, so I might be a wee bit wrong
> in what you need... please correct me if you need other info.
> 
> I have a ZFS pool called jails, with two datasets: jails/basejail and
> jails/jail1. I want jail1 mounted over basejail, at the jail1 mount
> point.
> 
> # cd jails
> # mount_unionfs -o below basejail/ jail1/
> 
> And I get:
> 
> panic: solaris assert: cnp->cn_namelen < sizeof(nm), file: /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c, line: 6213
> 
> Info: 
> 
> Dump header from device: /dev/gpt/swap0
> Architecture: amd64
> Architecture Version: 2
> Dump Length: 2351693824
> Blocksize: 512
> Dumptime: Wed Sep  2 10:23:58 2015
> Hostname: storm
> Magic: FreeBSD Kernel Dump
> Version String: FreeBSD 11.0-CURRENT #0 r287374: Tue Sep  1 15:31:17 EDT 2015
> root_at_storm:/usr/obj/usr/src/sys/GENERIC
> Panic String: solaris assert: cnp->cn_namelen < sizeof(nm), file: /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c, line: 6213
> Dump Parity: 1813619135
> Bounds: 3
> Dump Status: good
> 
> Full panic info at: http://www-old.michaelwlucas.com/core.txt.3
> but here's the top of the message.
> 
> Unread portion of the kernel message buffer:
> panic: solaris assert: cnp->cn_namelen < sizeof(nm), file: /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c, line: 6213
> cpuid = 3
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe085d0cc360
> vpanic() at vpanic+0x189/frame 0xfffffe085d0cc3e0
> panic() at panic+0x43/frame 0xfffffe085d0cc440
> assfail() at assfail+0x1a/frame 0xfffffe085d0cc450
> zfs_freebsd_lookup() at zfs_freebsd_lookup+0x47/frame 0xfffffe085d0cc590
> VOP_CACHEDLOOKUP_APV() at VOP_CACHEDLOOKUP_APV+0xf1/frame 0xfffffe085d0cc5c0
> vfs_cache_lookup() at vfs_cache_lookup+0xd6/frame 0xfffffe085d0cc620
> VOP_LOOKUP_APV() at VOP_LOOKUP_APV+0xf1/frame 0xfffffe085d0cc650
> relookup() at relookup+0xa1/frame 0xfffffe085d0cc6b0
> unionfs_relookup() at unionfs_relookup+0x105/frame 0xfffffe085d0cc710
> unionfs_relookup_for_delete() at unionfs_relookup_for_delete+0x56/frame 0xfffffe085d0cc7a0
> unionfs_rmdir() at unionfs_rmdir+0xd1/frame 0xfffffe085d0cc800
> VOP_RMDIR_APV() at VOP_RMDIR_APV+0xf7/frame 0xfffffe085d0cc830
> kern_rmdirat() at kern_rmdirat+0x1bc/frame 0xfffffe085d0cc9a0
> amd64_syscall() at amd64_syscall+0x282/frame 0xfffffe085d0ccab0
> Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe085d0ccab0
> --- syscall (137, FreeBSD ELF64, sys_rmdir), rip = 0x80089341a, rsp = 0x7fffffffe8f8, rbp = 0x7fffffffe930 ---
> KDB: enter: panic
> 
> Thanks!
> ==ml
> 
> -- 
> Michael W. Lucas  -  mwlucas_at_michaelwlucas.com, Twitter _at_mwlauthor 
> http://www.MichaelWLucas.com/, http://blather.MichaelWLucas.com/

-- 
Michael W. Lucas  -  mwlucas_at_michaelwlucas.com, Twitter _at_mwlauthor 
http://www.MichaelWLucas.com/, http://blather.MichaelWLucas.com/