-CURRENT panics in NFS

- poudriere data stored on NFS
- NFS server 12-STABLE
- NFS client (that panicked) 14-CURRENT
- Panic string:

condition dvp != vp not met at /usr/src/sys/kern/vfs_cache.c:2269 (cache_enter_time)

backtrace:

Tracing pid 27294 tid 100893 td 0xfffffe00ea1a3500
kdb_enter() at kdb_enter+0x37/frame 0xfffffe00ea3dee10
vpanic() at vpanic+0x1b2/frame 0xfffffe00ea3dee60
panic() at panic+0x43/frame 0xfffffe00ea3deec0
cache_enter_time() at cache_enter_time+0x1574/frame 0xfffffe00ea3defa0
nfsrpc_readdirplus() at nfsrpc_readdirplus+0xcb6/frame 0xfffffe00ea3df3d0
ncl_readdirplusrpc() at ncl_readdirplusrpc+0xdc/frame 0xfffffe00ea3df520
ncl_doio() at ncl_doio+0x423/frame 0xfffffe00ea3df5b0
ncl_bioread() at ncl_bioread+0x5cc/frame 0xfffffe00ea3df740
nfs_readdir() at nfs_readdir+0x18f/frame 0xfffffe00ea3df850
vop_sigdefer() at vop_sigdefer+0x2f/frame 0xfffffe00ea3df880
VOP_READDIR_APV() at VOP_READDIR_APV+0x38/frame 0xfffffe00ea3df8a0
kern_getdirentries() at kern_getdirentries+0x1fb/frame 0xfffffe00ea3df990
sys_getdirentries() at sys_getdirentries+0x29/frame 0xfffffe00ea3df9c0
amd64_syscall() at amd64_syscall+0x12e/frame 0xfffffe00ea3dfaf0
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe00ea3dfaf0


running processes:

27295 27179 27179     0  S+      piperd  0xfffff800090b4ba0  xargs
27294 27179 27179     0  R+      CPU 1                       find
27179   816 27179     0  S+      wait    0xfffff80181b69528  sh

Dump header from device: /dev/vtbd0p3
  Architecture: amd64
  Architecture Version: 2
  Dump Length: 1860571136
  Blocksize: 512
  Compression: none
  Dumptime: 2021-02-27 14:59:59 +0100
  Hostname: b14.builder.wilbury.net
  Magic: FreeBSD Kernel Dump
  Version String: FreeBSD 14.0-CURRENT #0 main-n245107-172f2fc11cc: Fri Feb 26 15:20:00 CET 2021
    root_at_b14.builder.wilbury.net:/usr/obj/usr/src/amd64.amd64/sys/GENERIC
  Panic String: condition dvp != vp not met at /usr/src/sys/kern/vfs_cache.c:2269 (cache_enter_time)
  Dump Parity: 1481068399
  Bounds: 0
  Dump Status: good

—
Juraj Lutter
XMPP: juraj (at) lutter.sk
GSM: +421907986576