Re: kern/53261: kernel crash during test run

[Martin Husemann <martin%duskware.de@localhost>]

The following reply was made to PR kern/53261; it has been noted by GNATS.

From: Martin Husemann <martin%duskware.de@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/53261: kernel crash during test run
Date: Wed, 23 May 2018 15:53:20 +0200

 On Wed, May 23, 2018 at 01:45:01PM +0000, Kamil Rytarowski wrote:
 >  Syscall6 is a wrapper for RawSyscall that is a wrapper for syscall(2).
 >  We should just fix the ARM panic and be done with it.
 
 You do not understand. Read the syscall(2) man page.
 
 Using syscall(2) instead of __syscall(2) for any of the calls I listed
 is illegal.
 
 If it works, it is by pure luck. You typically may have such luck on
 _LP64 platforms (all args passed in 64bit registers) and i386 (args
 passed on stack) - but usually the wrong arguments will be passed to
 the kernel. The sparc case that uwe cited will still fail the call
 (but at least not panic the kernel like arm).
 
 Martin