On Wed, 2020-03-25 at 17:02 +0000, David Laight wrote: > CAUTION: This email originated from outside of the organization. Do > not click links or open attachments unless you recognize the sender > and know the content is safe. > > > From: Joakim Tjernlund > > Sent: 23 March 2020 15:45 > ... > > > > I tried to follow that chain thinking it would end up sending a > > > > signal to user space but I cannot > > see > > > > that happens. Seems to be related to debugging. > > > > > > > > In short, I cannot see any signal being delivered to user > > > > space. If so that would explain why > > > > our user space process never dies. > > > > Is there a signal hidden in machine_check handler for SIGBUS I > > > > cannot see? > > > > > > > > > > Isn't it done in do_exit(), called from oops_end() ? > > > > hmm, so it seems. The odd thing though is that do_exit takes an > > exit code, not signal number. > > Also, feels a bit odd to force an exit(that we haven't seen > > happening) rather than just a signal. > > Isn't there something 'magic' that converts EFAULT into SIGSEGV?
I have tried to find out and I cannot see a signal beeing sent. Also, SEGV is wrong, this is a SIGBUS fault. > > David > > - > Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, > MK1 1PT, UK > Registration No: 1397386 (Wales)