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Re: kern/52598 (/proc/self/exe misbehaves if it's on a null mount)

The following reply was made to PR kern/52598; it has been noted by GNATS.

From: =?UTF-8?Q?Fr=C3=A9d=C3=A9ric_Fauberteau?= <>
Cc: Pierre Pronchery <>,,
Subject: Re: kern/52598 (/proc/self/exe misbehaves if it's on a null mount)
Date: Mon, 13 Jan 2020 23:23:27 +0100

 I tried to apply the changes made by christos to introduce p_path in 
 struct proc to netbsd-8-0-RELEASE:
 cvs rdiff -u -r1.197.2.2 -r1.200 src/sys/miscfs/procfs/procfs_vnops.c
 cvs rdiff -u -r1.340.6.1 -r1.343 src/sys/sys/proc.h
 Now I get the following behavior:
 # ls -l /proc/curproc
 lr-xr-xr-x  1 root  wheel  2 Jan 13 23:09 /proc/curproc -> 49
 # ls -l /proc/curproc/
 causes a fatal page fault.
 The backtrace I got using crash(1):
 # crash -M netbsd.9.core
 Crash version 8.0, image version 8.0.
 System panicked: trap
 Backtrace from time of crash is available.
 crash> bt
 ?() at ffff800064978000
 vpanic() at vpanic+0x166
 snprintf() at snprintf
 trap() at trap+0xa00
 --- trap (number 6) ---
 strlen() at strlen+0x20
 vn_stat() at vn_stat+0x3d
 do_sys_statat() at do_sys_statat+0x89
 sys___lstat50() at sys___lstat50+0x25
 syscall() at syscall+0x1ec
 --- syscall (number 441) ---

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