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uml: definitively kill subprocesses on panic

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In a stock 2.6.22.6 kernel, poweroff a user mode linux guest (2.6.22.6 running
in skas0 mode) will halt the host linux.  I think the reason is the kernel
thread abort because of a bug.  Then the sys_reboot in process of user mode
linux guest is not trapped by the user mode linux kernel and is executed by
host.  I think it is better to make sure all of our children process to quit
when user mode linux kernel abort.

[ jdike - the kernel process needs to ignore SIGTERM, plus the waitpid/kill
loop is needed to make sure that all of our children are dead before the
kernel exits ]

Signed-off-by: Lepton Wu <ytht.net@gmail.com>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Lepton Wu
2007-10-16 01:27:35 -07:00
committed by Linus Torvalds
parent cb8fa61c2b
commit a24864a1d5
2 changed files with 39 additions and 1 deletions
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2
arch/um/os-Linux/skas/process.c
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@@ -177,7 +177,7 @@ static int userspace_tramp(void *stack)
ptrace(PTRACE_TRACEME, 0, 0, 0);
init_new_thread_signals();
signal(SIGTERM, SIG_DFL);
err = set_interval();
if (err)
panic("userspace_tramp - setting timer failed, errno = %d\n",