Date: Mon, 21 Apr 1997 03:31:50 -0700 From: David Greenman <dg@root.com> To: Bruce Evans <bde@zeta.org.au> Cc: freebsd-bugs@freebsd.org, Shimon@i-Connect.Net Subject: Re: Mystery of the X11 Panic... Message-ID: <199704211031.DAA03600@root.com> In-Reply-To: Your message of "Mon, 21 Apr 1997 18:52:09 %2B1000." <199704210852.SAA27852@godzilla.zeta.org.au>
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>[cc list trimmed to remove -hackers] > >>Fatal trap 12 - Page fault while in kernel mode. in virtual address >>0xf71e0014. Tracing back shows that bash (?!) was the culprit, causing it >>after calling _Xsyscall -> _syscall -> _vm_open -> _spec_open. >> >>Things go south at _spec_open + 0x6e, complaining about cmpl $0,0(%eax). > >This means that cdevsw[maj]->d_open is bad (probably null) although >cdevsw[maj] != NULL. This might be caused by a buggy or stale LKM. >Driver LKM's tend to cause this problem if they are unloaded. Bash >may trigger the problem because it does an opendir() on device files >(but I thought I fixed this by not opening device files in opendir()). >I wouldn't use LKMs for anything important. ...or it could be caused by the bug in kern_exec.c, which could have mangled adjacent buffers or possibly random kernel memory. It seems to involve bash and the kern_exec.c bug was triggered when running small shell scripts. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
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