[Bug 273418] [panic] Repeating kernel panic on open(/dev/console)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273418

--- Comment #28 from Eugene Grosbein <eugen@freebsd.org> ---
(kgdb) frame 21
#21 0xffffffff80d08c58 in kern_openat (td=0xfffffe0037918c80,
    td@entry=<error reading variable: value is not available>, fd=-100,
    fd@entry=<error reading variable: value is not available>,
    path=0x2dbfc31974a0 <error: Cannot access memory at address
0x2dbfc31974a0>,
    path@entry=<error reading variable: value is not available>,
pathseg=UIO_USERSPACE,
    pathseg@entry=<error reading variable: value is not available>, flags=6,
    flags@entry=<error reading variable: value is not available>,
mode=<unavailable>,
    mode@entry=<error reading variable: value is not available>)
    at /data/src/sys/kern/vfs_syscalls.c:1158
(kgdb) p nd
$1 = {ni_dirp = 0x2dbfc31974a0 <error: Cannot access memory at address
0x2dbfc31974a0>,
  ni_segflg = UIO_USERSPACE, ni_rightsneeded = 0xfffffe0152d4ddb0, ni_startdir
= 0x0,
  ni_rootdir = 0xfffff80443009988, ni_topdir = 0x0, ni_dirfd = -100, ni_lcf =
0, ni_filecaps = {
    fc_rights = {cr_rights = {0, 0}}, fc_ioctls = 0x0, fc_nioctls = -1,
fc_fcntls = 0},
  ni_vp = 0x0, ni_dvp = 0xfffff80003fcb5b8, ni_resflags = 1, ni_debugflags = 3,
ni_loopcnt = 0,
  ni_pathlen = 1, ni_next = 0xfffff8068a66b00c "", ni_cnd = {cn_origflags =
8683588,
    cn_flags = 344227908, cn_thread = 0xfffffe0037918c80, cn_cred =
0xfffff8044037dc00,
    cn_nameiop = LOOKUP, cn_lkflags = 532480, cn_pnbuf = 0xfffff8068a66b000
"/dev/console",
    cn_nameptr = 0xfffff8068a66b005 "console", cn_namelen = 7}, ni_cap_tracker
= {
    tqh_first = 0x0, tqh_last = 0xfffffe0152d4dd78}, ni_dvp_seqc = 932285568,
  ni_vp_seqc = 4294966784}

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