linux-kernel - binfmt_misc: hangs in syscall with x86 userland on x86

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Message-ID: <1315299323.7365.10.camel@localhost.localdomain>
Date:	Tue, 06 Sep 2011 10:55:19 +0200
From:	Thomas Meyer <thomas@...3r.de>
To:	viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: binfmt_misc: hangs in syscall with x86 userland on x86_64 kernel

hello,

something in the binfmt_misc filesystem system seems to be broken when
trying to use this driver with an x86 user land on an x86_64 kernel.

the command "ls /proc/sys/fs/binfmt_misc" seems to hang in the stat64
syscall:

> stat64("/proc/sys/fs/binfmt_misc", 0x8bf68e8) = -1 EINTR (Interrupted system call)
> --- {si_signo=SIGINT, si_code=SI_KERNEL, si_value={int=1248448068, ptr=0x4a69ce44}} (Interrupt) ---
> +++ killed by SIGINT +++

I had to remove the systemd-binfmt register service from my default
runlevel to get to a shell/X11.

any ideas what's going on here?

the program "systemd-binfmt" seems to hang in this open() syscall:

> open("/proc/sys/fs/binfmt_misc/status", O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE|O_CLOEXEC, 0666) = -1 EINTR (Interrupted system call)
> --- {si_signo=SIGINT, si_code=SI_KERNEL, si_value={int=1248448068, ptr=0x4a69ce44}} (Interrupt) ---
> +++ killed by SIGINT +++

with kind regards
thomas

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