Messages in this thread | | | Subject | Re: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3) | From | Benjamin Herrenschmidt <> | Date | Thu, 21 Aug 2008 07:36:29 +1000 |
| |
> > As you can see, it restores r1 -before- it pops r24..r31 off > > the stack ! I let you imagine what happens if an interrupt happens > > just in between those two instructions (mr and lmw). We don't do > > redzones on our ABI, so basically, the registers end up corrupted > > by the interrupt. > > Ouch! You've disassembled this without -pg too, and it does not have this > bug? What version of gcc do you have?
Oops, should have mentioned it ;-)
4.2.3 (Ubuntu 4.2.3-2ubuntu7)
Ben.
| |