kern/176179: nfs client KASSERT: panic: attempt to set TDF_SBDRY recursively

[Russell Cattelan]

>Number:         176179
>Category:       kern
>Synopsis:       nfs client KASSERT: panic: attempt to set TDF_SBDRY recursively
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Feb 15 19:30:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Russell Cattelan
>Release:        FreeBSD-current 2/12/2013
>Organization:
Digitalelves Inc
>Environment:
FreeBSD 10 running on vmware fusion

>Description:
Ran into this while doing a make buildworld.

The vmserver is a os x 10.8 box and was hosting
the src tree.

FreeBSD 10 was using nfs client code to mount the
src via a local only network link




login: panic: attempt to set TDF_SBDRY recursively
cpuid = 0
KDB: enter: panic
[ thread pid 3747 tid 100095 ]
Stopped at      kdb_enter+0x3e: movq    $0,kdb_why
db> 
db> bt
Tracing pid 3747 tid 100095 td 0xfffffe0001a8c900
kdb_enter() at kdb_enter+0x3e/frame 0xffffff8015464bd0
vpanic() at vpanic+0x147/frame 0xffffff8015464c10
kassert_panic() at kassert_panic+0x136/frame 0xffffff8015464c80
sigdeferstop() at sigdeferstop+0x5d/frame 0xffffff8015464ca0
newnfs_set_sigmask() at newnfs_set_sigmask+0x1e8/frame 0xffffff8015464ce0
newnfs_request() at newnfs_request+0xb0/frame 0xffffff8015464e10
nfscl_request() at nfscl_request+0x72/frame 0xffffff8015464e60
nfsrpc_write() at nfsrpc_write+0x456/frame 0xffffff8015465050
ncl_writerpc() at ncl_writerpc+0xe1/frame 0xffffff8015465190
ncl_doio() at ncl_doio+0x3f6/frame 0xffffff8015465230
nfs_strategy() at nfs_strategy+0x7d/frame 0xffffff8015465260
VOP_STRATEGY_APV() at VOP_STRATEGY_APV+0xd0/frame 0xffffff8015465280
bufstrategy() at bufstrategy+0x46/frame 0xffffff80154652c0
ncl_writebp() at ncl_writebp+0xb5/frame 0xffffff80154652f0
getblk() at getblk+0x3ae/frame 0xffffff8015465390
nfs_getcacheblk() at nfs_getcacheblk+0x58/frame 0xffffff80154653e0
ncl_write() at ncl_write+0x720/frame 0xffffff80154655a0
VOP_WRITE_APV() at VOP_WRITE_APV+0x13b/frame 0xffffff80154656b0
vn_write() at vn_write+0x2f0/frame 0xffffff8015465740
vn_io_fault() at vn_io_fault+0x22a/frame 0xffffff80154658c0
dofilewrite() at dofilewrite+0x85/frame 0xffffff8015465910
kern_writev() at kern_writev+0x48/frame 0xffffff8015465950
sys_write() at sys_write+0x63/frame 0xffffff80154659a0
amd64_syscall() at amd64_syscall+0x265/frame 0xffffff8015465ab0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xffffff8015465ab0
--- syscall (4, FreeBSD ELF64, sys_write), rip = 0x4bcbfa, rsp = 0x7fffffffc748, rbp = 0x7fffffffc770 ---
db> 

>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: