https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203492
Bug ID: 203492
Summary: mount_unionfs -o below causes panic
Product: Base System
Version: 11.0-CURRENT
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: mwlu...@michaelwlucas.com
Created attachment 161624
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=161624&action=edit
core.txt
Running:
FreeBSD storm 11.0-CURRENT FreeBSD 11.0-CURRENT #4 r288449: Thu Oct 1 10:07:03
EDT 2015 root@storm:/usr/obj/usr/src/sys/JAIL amd64
The kernel config is:
include GENERIC
ident VIMAGE
options VIMAGE
options RACCT
options RCTL
The same behavior also occurs on GENERIC, however.
This host has a jails pool, with two datasets: basejail and jail1. I want jail1
to be the mountpoint, and mount jail1 on top of basejail. My understanding is
that I can then reuse the basejail dataset for multiple jails.
# cd jails
# mount_unionfs -o below basejail/ jail1/
If I go into /jails/jail1 and try to remove something from the lower layer, I
get a panic.
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 0xfffffe085d12b360
vpanic() at vpanic+0x189/frame 0xfffffe085d12b3e0
panic() at panic+0x43/frame 0xfffffe085d12b440
assfail() at assfail+0x1a/frame 0xfffffe085d12b450
zfs_freebsd_lookup() at zfs_freebsd_lookup+0x47/frame 0xfffffe085d12b590
VOP_CACHEDLOOKUP_APV() at VOP_CACHEDLOOKUP_APV+0xf1/frame 0xfffffe085d12b5c0
vfs_cache_lookup() at vfs_cache_lookup+0xd6/frame 0xfffffe085d12b620
VOP_LOOKUP_APV() at VOP_LOOKUP_APV+0xf1/frame 0xfffffe085d12b650
relookup() at relookup+0xa1/frame 0xfffffe085d12b6b0
unionfs_relookup() at unionfs_relookup+0x105/frame 0xfffffe085d12b710
unionfs_relookup_for_delete() at unionfs_relookup_for_delete+0x56/frame
0xfffffe085d12b7a0
unionfs_rmdir() at unionfs_rmdir+0xd1/frame 0xfffffe085d12b800
VOP_RMDIR_APV() at VOP_RMDIR_APV+0xf7/frame 0xfffffe085d12b830
kern_rmdirat() at kern_rmdirat+0x1bc/frame 0xfffffe085d12b9a0
amd64_syscall() at amd64_syscall+0x2e1/frame 0xfffffe085d12bab0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe085d12bab0
--- syscall (137, FreeBSD ELF64, sys_rmdir), rip = 0x800896dba, rsp =
0x7fffffffe8f8, rbp = 0x7fffffffe930 ---
KDB: enter: panic
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