[User-mode-linux-devel] linux-2.4.0-test8 kernel with std{in|out|err} as /dev/null?

[William S. <wst...@po...>]

Good day, Jeff, Vince and all,
	I'm trying to get UML to run with no console at all; I want it to
run in the background as a network server.  Here's the command line I'd
like to use:

/var/lib/uml/linux mem=32M </dev/null >/dev/null 2>/dev/null

	I get a core dump from that (I'd be glad to provide the core file,
of course).  By stracing the uml kernel with:

strace -o /tmp/uml-no-console /var/lib/uml/linux mem=32M </dev/null >/dev/null 2>/dev/null

	, I get a trace file that ends with pages and pages of:

rt_sigprocmask(SIG_BLOCK, [ALRM VTALRM IO], [ALRM VTALRM IO], 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [], NULL, 8) = 0
ioctl(0, SNDCTL_TMR_STOP, {0x1007 /* B??? */ -opost -isig -icanon -echo ...}) = -1 ENOTTY (Inappropriate ioctl for device)
rt_sigprocmask(SIG_BLOCK, [ALRM VTALRM IO], [ALRM VTALRM IO], 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [], NULL, 8) = 0
ioctl(0, SNDCTL_TMR_STOP, {0x1007 /* B??? */ -opost -isig -icanon -echo ...}) = -1 ENOTTY (Inappropriate ioctl for device)
rt_sigprocmask(SIG_BLOCK, [ALRM VTALRM IO], [ALRM VTALRM IO], 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [], NULL, 8) = 0
ioctl(0, SNDCTL_TMR_STOP, {0x1007 /* B??? */ -opost -isig -icanon -echo ...}) = -1 ENOTTY (Inappropriate ioctl for device)
--- SIGSEGV (Segmentation fault) ---
--- SIGSEGV (Segmentation fault) ---
+++ killed by SIGSEGV +++

	Without the redirects, the uml kernel starts up fine.

	If I try redirecting it to tty12 (the first 11 are used) with:

/var/lib/uml/linux mem=32M </dev/tty12 >/dev/tty12 2>/dev/tty12 &

	I get none of the boot or login messages, only the usual:
error stat'ing /dev/ttydirs/xxx/xxxxxxxxxxxxp1: No such file or directory
error stat'ing /dev/ttydirs/xxx/xxxxxxxxxxxxp2: No such file or directory
error stat'ing /dev/ttydirs/xxx/xxxxxxxxxxxxp3: No such file or directory
error stat'ing /dev/ttydirs/xxx/xxxxxxxxxxxxp4: No such file or directory
	stair-stepping across the screen as the xterms start up.  However,
if I simply log in as a user blindly, I can log in successfully and run
commands (I can verify that with "w" from one of the xterms).

	UML kernel is 2.4.0-test8:
Linux version 2.4.0-test8-1um (jd...@cc...) (gcc version
egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)) #1 Fri Sep 8 21:47:26
EST 2000
	Host kernel is 2.4.0-test7-pre4 w/ Rik's vmpatch.
	The root filesystem happens to be an Immunix root_fs (essentially
the same as rh 6.2).
	Cheers,
	- Bill

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(Courtesy of Joe <jg...@t-...>)
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William Stearns (wst...@po...).  Mason, Buildkernel, named2hosts, 
and ipfwadm2ipchains are at:                http://www.pobox.com/~wstearns
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