https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219935
--- Comment #10 from Raimo Niskanen <raimo+free...@erix.ericsson.se> ---
Lo and behold!
With the following patch:
===================================================================
--- sys/kern/vfs_subr.c (revision 322570)
+++ sys/kern/vfs_subr.c (working copy)
@@ -2449,6 +2449,9 @@ vholdl(struct vnode *vp)
ASSERT_VI_LOCKED(vp, "vholdl");
#endif
vp->v_holdcnt++;
+ if (vp->v_holdcnt == 1 && vp->v_type == VBAD)
+ panic("vhold: reclaimed vnode");
+
if ((vp->v_iflag & VI_FREE) == 0)
return;
VNASSERT(vp->v_holdcnt == 1, vp, ("vholdl: wrong hold count"));
I got this panic:
===================================================================
sasquatch.otp.ericsson.se dumped core - see /var/crash/vmcore.3
Wed Aug 30 07:18:08 CEST 2017
FreeBSD sasquatch.otp.ericsson.se 10.3-RELEASE-p21 FreeBSD 10.3-RELEASE-p21 #0:
Mon Aug 28 11:05:53 CEST 2017
r...@sasquatch.otp.ericsson.se:/usr/obj/usr/src/sys/DEBUG amd64
panic: vhold: reclaimed vnode
GNU gdb 6.1.1 [FreeBSD]
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This GDB was configured as "amd64-marcel-freebsd"...
Unread portion of the kernel message buffer:
panic: vhold: reclaimed vnode
cpuid = 1
KDB: stack backtrace:
#0 0xffffffff8098e810 at kdb_backtrace+0x60
#1 0xffffffff809514e6 at vpanic+0x126
#2 0xffffffff809513b3 at panic+0x43
#3 0xffffffff809f77e5 at vholdl+0x145
#4 0xffffffff809f0f40 at dounmount+0x60
#5 0xffffffff81a6dfe4 at zfs_unmount_snap+0x114
#6 0xffffffff81a10663 at dsl_dataset_user_release_impl+0x103
#7 0xffffffff81a10f2c at dsl_dataset_user_release_onexit+0x5c
#8 0xffffffff81a79fb6 at zfs_onexit_destroy+0x56
#9 0xffffffff81a70072 at zfsdev_close+0x52
#10 0xffffffff80833e19 at devfs_fpdrop+0xa9
#11 0xffffffff80836585 at devfs_close_f+0x45
#12 0xffffffff80905fa9 at _fdrop+0x29
#13 0xffffffff8090884e at closef+0x21e
#14 0xffffffff80906358 at closefp+0x98
#15 0xffffffff80d56e9f at amd64_syscall+0x40f
#16 0xffffffff80d3c0fb at Xfast_syscall+0xfb
Uptime: 1d19h20m50s
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