On 04/14/2013 06:44 PM, Alistair Popple wrote: > The current mainline crashes when hitting userspace with the following: > > kernel BUG at /home/alistair/Source/linux-stable/kernel/auditsc.c:1769! > cpu 0x1: Vector: 700 (Program Check) at [c000000023883a60] > pc: c0000000001047a8: .__audit_syscall_entry+0x38/0x130 > lr: c00000000000ed64: .do_syscall_trace_enter+0xc4/0x270 > sp: c000000023883ce0 > msr: 8000000000029032 > current = 0xc000000023800000 > paca = 0xc00000000f080380 softe: 0 irq_happened: 0x01 > pid = 1629, comm = start_udev > kernel BUG at /home/alistair/Source/linux-stable/kernel/auditsc.c:1769! > enter ? for help > [c000000023883d80] c00000000000ed64 .do_syscall_trace_enter+0xc4/0x270 > [c000000023883e30] c000000000009b08 syscall_dotrace+0xc/0x38 > --- Exception: c00 (System Call) at 0000008010ec50dc > > Bisecting found the following patch caused it: > > commit 44e9309f1f357794b7ae93d5f3e3e6f11d2b8a7f > Author: Haren Myneni <ha...@linux.vnet.ibm.com> > powerpc: Implement PPR save/restore > > It was found this patch corrupted r9 when calling > SET_DEFAULT_THREAD_PPR() > > Using r10 as a scratch register instead of r9 solved the problem.
Thanks for fixing. Sorry I missed it Acked-by: Haren Myneni <ha...@us.ibm.com> > > Signed-off-by: Alistair Popple <alist...@popple.id.au> > Acked-by: Michael Neuling <mi...@neuling.org> > --- > > diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S > index 256c5bf..3acb1a0 100644 > --- a/arch/powerpc/kernel/entry_64.S > +++ b/arch/powerpc/kernel/entry_64.S > @@ -304,7 +304,7 @@ syscall_exit_work: > subi r12,r12,TI_FLAGS > > 4: /* Anything else left to do? */ > - SET_DEFAULT_THREAD_PPR(r3, r9) /* Set thread.ppr = 3 */ > + SET_DEFAULT_THREAD_PPR(r3, r10) /* Set thread.ppr = 3 */ > andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP) > beq .ret_from_except_lite > > > _______________________________________________ > Linuxppc-dev mailing list > Linuxppc-dev@lists.ozlabs.org > https://lists.ozlabs.org/listinfo/linuxppc-dev > _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
