> Hi, i was trying to execute an user space program through a kernel module, > i've used the same method of linux-$KERNELVERSION/drivers/usb/usb.c, and > this is the interesting code.. > > [...] > char *argv[3]; > char *envp[3]; > > argv [0] = "/usr/sbin/httpd"; > argv [1] = "httpd"; > argv [2] = 0; > > envp[0] = "HOME=/"; > envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; > envp[2] = 0; > > call_usermodehelper(argv [0], argv, envp); > [...] > > but when I run it, it causes a kernel panic during the > call_usermodehelper() call.. this is the kernel panic message: > > kernel BUG at sched.c:564 > invalid operand: 0000 > CPU: 0 > EIP: 0010:[<c0114d7b] Not tainted > EFLAGS: 00010282 > [...] > <0> Kernel panic: Aiee, killing interrupt handler! > In interrupt handler - not syncing > Are you calling call_usermodehelper() from within an interrupt handler ? I believe call_usermodehelper() must be called from a context that can wait. To test this you can try to use the define in_atomic(). If it returns TRUE then you are in a context that can't wait. dom -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
