Re: NFS panic in latest main

I have another one:

    db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe008dfd0490
    assert_vop_locked() at assert_vop_locked+0x49/frame 0xfffffe008dfd04b0
    VOP_PATHCONF_APV() at VOP_PATHCONF_APV+0x42/frame 0xfffffe008dfd04e0
    nfsv4_fillattr() at nfsv4_fillattr+0xfa8/frame 0xfffffe008dfd0670
    nfsvno_fillattr() at nfsvno_fillattr+0xdd/frame 0xfffffe008dfd0710
    nfsrvd_getattr() at nfsrvd_getattr+0x3c6/frame 0xfffffe008dfd09a0
    nfsrvd_dorpc() at nfsrvd_dorpc+0x167e/frame 0xfffffe008dfd0bb0
    nfssvc_program() at nfssvc_program+0x852/frame 0xfffffe008dfd0db0
    svc_run_internal() at svc_run_internal+0xaa8/frame 0xfffffe008dfd0ee0
    svc_thread_start() at svc_thread_start+0xb/frame 0xfffffe008dfd0ef0
    fork_exit() at fork_exit+0x82/frame 0xfffffe008dfd0f30
    fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe008dfd0f30
    --- trap 0xc, rip = 0x2a07bda3b4ea, rsp = 0x2a07bc818ed8, rbp = 0x2a07bc819170 ---
    vnode 0xfffff8007dfdac08: type VDIR state VSTATE_CONSTRUCTED op 0xffffffff822fc120
        usecount 3, writecount 0, refcount 1 seqc users 0 mountedhere 0
        hold count flags ()
        flags (VV_ROOT)
        lock type tmpfs: UNLOCKED
    tag VT_TMPFS, tmpfs_node 0xfffff800ada100f0, flags 0x0, links 2
    	mode 0755, owner 0, group 0, size 0, status 0x0
    
    VOP_PATHCONF Entry (vp): 0xfffff8007dfdac08 is not locked but should be

This can be reliably triggered by running the nfsv4 test case from
review D51371.  Note that you will need to apply D51372 first to allow
the client jail to mount NFS file systems.

DES
-- 
Dag-Erling Smørgrav - des@FreeBSD.org