Re: kern/54541: kernel panic using "zfs diff"

["J. Hannken-Illjes" <hannken%eis.cs.tu-bs.de@localhost>]

The following reply was made to PR kern/54541; it has been noted by GNATS.

From: "J. Hannken-Illjes" <hannken%eis.cs.tu-bs.de@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/54541: kernel panic using "zfs diff"
Date: Sat, 12 Oct 2019 10:02:28 +0200

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 > On 12. Oct 2019, at 01:50, Brad Spencer <brad%anduin.eldar.org@localhost> wrote:
 <snip>
 >=20
 > [ 472375.2036056] panic: kernel diagnostic assertion "fdm !=3D NULL" =
 failed: file "/usr/src/sys/kern/vfs_trans.c", line 166 mount 0x0 invalid
 
 Sorry for being late, looks like vn_rdwr() gets called
 with garbage instead of a vnode.
 
 The attached diff could help to track it down.
 
 Do you have a recipe to trigger this panic?
 
 --
 J. Hannken-Illjes - hannken%eis.cs.tu-bs.de@localhost - TU Braunschweig
 
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 --- zfs_ioctl.c	22 May 2019 08:46:27 -0000	1.20
 +++ zfs_ioctl.c	12 Oct 2019 07:58:07 -0000
 @@ -5297,4 +5297,6 @@ zfs_ioc_diff(zfs_cmd_t *zc)
  	off = fp->f_offset;
  
 +	KASSERTMSG(fp->f_type == DTYPE_VNODE, "type=%u", fp->f_type);
 +
  #ifdef __FreeBSD__
  	error = dmu_diff(zc->zc_name, zc->zc_value, fp, &off);
 
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