On Thu, 2011-09-01 at 00:38 +0200, Sebastien Bernard wrote: > Package: linux-2.6 > Version: 3.0.0-3 > Severity: important > > Dear Maintainer, > Kernel fails to boot on my V240 dual processor ultrasparc machine. It does not boot at all. Last kernel known to work > is 2.6.39. > > I join to the but report the output of the boot capture through the serial port. [...] > [ 0.000000] swapper(0): Kernel illegal instruction [#1] > [ 0.000000] TSTATE: 0000001180e01605 TPC: 00000000005e0920 TNPC: 00000000005e0924 Y: 00000000 Not tainted > [ 0.000000] TPC: <__ffs+0x8/0x88> > [ 0.000000] g0: 00000000008af351 g1: 0000000000040000 g2: 000000000093ff74 g3: fffff8003fed8008 > [ 0.000000] g4: 00000000008ca850 g5: 0000000000000000 g6: 00000000008ac000 g7: 0000000000000000 > [ 0.000000] o0: fffffffffffc0000 o1: 000000000007ffff o2: ffffffffffffffff o3: 00000000008afe48 > [ 0.000000] o4: 0000000000000005 o5: 00000000009950b0 sp: 00000000008af3b1 ret_pc: 00000000005d0540 > [ 0.000000] RPC: <find_next_zero_bit+0xa0/0xb4> > [ 0.000000] l0: 0000000000000000 l1: 0000000000000d84 l2: 0000000000000d84 l3: 00000000008d3790 > [ 0.000000] l4: fffffffffffff27c l5: 000000000000000e l6: 00000000008d3400 l7: 00000000008d3400 > [ 0.000000] i0: fffff8003fed8000 i1: 000000000093ff74 i2: ffffffffffffffee i3: ffffffffffffffff > [ 0.000000] i4: 00000000009950a0 i5: 00000000009b5000 i6: 00000000008af461 i7: 000000000092d5a8 > [ 0.000000] I7: <alloc_bootmem_core+0x1ac/0x340> > [ 0.000000] [000000000092daec] ___alloc_bootmem_nopanic+0x70/0xa8 > [ 0.000000] [000000000092db34] ___alloc_bootmem+0x10/0x44 > [ 0.000000] [000000000091e4f4] start_kernel+0xac/0x3bc > [ 0.000000] [0000000000777768] tlb_fixup_done+0x98/0xa0 > [ 0.000000] [0000000000000000] (null) > [ 0.000000] Disabling lock debugging due to kernel taint > [ 0.000000] Caller[000000000092d5a8]: alloc_bootmem_core+0x1ac/0x340 > [ 0.000000] Caller[000000000092daec]: ___alloc_bootmem_nopanic+0x70/0xa8 > [ 0.000000] Caller[000000000092db34]: ___alloc_bootmem+0x10/0x44 > [ 0.000000] Caller[000000000091e4f4]: start_kernel+0xac/0x3bc > [ 0.000000] Caller[0000000000777768]: tlb_fixup_done+0x98/0xa0 > [ 0.000000] Caller[0000000000000000]: (null) > [ 0.000000] Instruction DUMP: 01000000 82200008 923a0001 > [ 0.000000] 81c3e008 90222001 01000000 832a3030 85323010 > [ 0.000000] Kernel panic - not syncing: Attempted to kill the idle task! > [ 0.000000] Call Trace: > [ 0.000000] [0000000000468c70] do_exit+0xb4/0x770 > [ 0.000000] [000000000042774c] die_if_kernel+0x29c/0x2c4 > [ 0.000000] [0000000000429770] do_illegal_instruction+0x4c/0x174 > [ 0.000000] [0000000000420210] tl0_ill+0x10/0x20 > [ 0.000000] [00000000005e0920] __ffs+0x8/0x88 > [ 0.000000] [000000000092d5a8] alloc_bootmem_core+0x1ac/0x340 > [ 0.000000] [000000000092daec] ___alloc_bootmem_nopanic+0x70/0xa8 > [ 0.000000] [000000000092db34] ___alloc_bootmem+0x10/0x44 > [ 0.000000] [000000000091e4f4] start_kernel+0xac/0x3bc > [ 0.000000] [0000000000777768] tlb_fixup_done+0x98/0xa0 > [ 0.000000] [0000000000000000] (null) > [ 0.000000] Press Stop-A (L1-A) to return to the boot prom > > > ** Model information > cpu : TI UltraSparc IIIi (Jalapeno) > fpu : UltraSparc IIIi integrated FPU > pmu : ultra3i > prom : OBP 4.22.33 2007/06/18 12:45 > type : sun4u [...] The code dump above has: 0: 01 00 00 00 nop 4: 82 20 00 08 neg %o0, %g1 8: 92 3a 00 01 xnor %o0, %g1, %o1 c: 81 c3 e0 08 retl 10: 90 22 20 01 dec %o0 14: 01 00 00 00 nop 18: 83 2a 30 30 sllx %o0, 0x30, %g1 1c: 85 32 30 10 srlx %o0, 0x10, %g2 Which looks like an incomplete replacement of the generic __ffs with the code from popc_6insn_patch, but I suspect the critical 'popc' instruction has been eaten somewhere along the way to email. So anyway, this CPU doesn't implement popc and is wrongly being detected as doing so. Ben.
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