On Tue, Jan 15, 2008 at 01:11:45PM +0000, Ralf Baechle wrote: > > we are facing a strange problem with lenny/sid chroots on IP28. The > > machine locks up after issuing a few ls/ps commands in a chroot > > bash. This only happens with a lenny/sid chroot, but not with etch. > > The major difference is probably the updare to glibc2.7. Since > > IP28 isn't really a nice R10k machine, it would be good, if someone > > with a working IP27/IP30 could try a lenny/sid chroot and tell us, > > if it's working/not working. > > Which CPU revision do you hit these problems on? On IRC Thomas said it's rev 2.5. R10000 upto version 2.6 has a broken store conditional so needs R10000_LLSC_WAR enabled. The sympthom is that SC succeed even though it should have failed so for example two multiple competing CPUs can take a spinlock. There is an erratum for this one. Another bug is when a rdhwr $29 opcode is encountered in a branch delay slot. This will result in the CPU stopping execution of instructions but an NMI can recover it. For emulation performance reasons gcc no longer places rdhwr $29 in delay slots, so this one is no longer encountered in C code but still could be in assembler code. This one isn't covered by any errata. There seem to be more funnies but to the best I can say they were never officially documented in errata either. Ralf
