Hi Kurt,
On 02/19/2017 12:59 PM, Kurt Jaeger wrote:
Ah, to correct myself here: We only used unionfs, not in combination
with nullfs. Can you describe why nullfs with unionfs does not
work in 11 ?
It panics easily. I use the following shell script to create a working
environment:
PREFIX=/jails
BASEJAIL=${PREFIX}/base-jail
JAILS="mongo-1 mongo-2 mongo-3 mongo-4 mongo-5 mongo-6"
mkdir -p $BASEJAIL
for jail in $JAILS
do
mkdir -p ${PREFIX}/$jail
mkdir -p ${PREFIX}/upper/$jail
mount -t nullfs -o ro $BASEJAIL ${PREFIX}/$jail
mount -t unionfs -o noatime ${PREFIX}/upper/$jail ${PREFIX}/$jail
# mount -t devfs none ${PREFIX}/$jail/dev
# cp /etc/resolv.conf ${PREFIX}/$jail/etc/resolv.conf
done
#chroot $PREFIX/mongo-1 rm -rv /var
#chroot $PREFIX/mongo-2 rm -rv /var
Then I can trigger a panic if I run this:
rm -rf /jails/mongo-*/*
And the panic:
Unread portion of the kernel message buffer:
panic: Memory modified after free 0xfffff80004d0e000(1024) val=adc0dede @
0xfffff80004d0e000
cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe012058ce90
vpanic() at vpanic+0x186/frame 0xfffffe012058cf10
panic() at panic+0x43/frame 0xfffffe012058cf70
trash_ctor() at trash_ctor+0x4b/frame 0xfffffe012058cf80
uma_zalloc_arg() at uma_zalloc_arg+0x514/frame 0xfffffe012058cfe0
unionfs_relookup() at unionfs_relookup+0x41/frame 0xfffffe012058d040
unionfs_mkshadowdir() at unionfs_mkshadowdir+0x120/frame 0xfffffe012058d270
unionfs_lookup() at unionfs_lookup+0x883/frame 0xfffffe012058d3c0
VOP_CACHEDLOOKUP_APV() at VOP_CACHEDLOOKUP_APV+0xda/frame 0xfffffe012058d3f0
vfs_cache_lookup() at vfs_cache_lookup+0xd6/frame 0xfffffe012058d450
VOP_LOOKUP_APV() at VOP_LOOKUP_APV+0xda/frame 0xfffffe012058d480
lookup() at lookup+0x6d2/frame 0xfffffe012058d520
namei() at namei+0x504/frame 0xfffffe012058d5e0
kern_statat() at kern_statat+0x98/frame 0xfffffe012058d790
sys_fstatat() at sys_fstatat+0x2c/frame 0xfffffe012058d830
amd64_syscall() at amd64_syscall+0x2f9/frame 0xfffffe012058d9b0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe012058d9b0
--- syscall (493, FreeBSD ELF64, sys_fstatat), rip = 0x8008ba62a, rsp =
0x7fffffffe728, rbp = 0x7fffffffe7e0 ---
KDB: enter: panic
Thanks in advance for any ideas,
Nikos
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