> I noticed that gcc 4.9.0 for sparc has landed on Debian unstable so I > gave it a try on V210. Does not boot with strange error about user > windows. This is reproducible. Since the same kernel comiled with gcc > 4.6 booted fine, it's probably a gcc 4.9 difference. I have done some more testing and digging. About tests - 4.9 is problematic only on my UltraSparc IIIi machines (V210 and V440). US I not tested yet, all US II variants work fine in my servers. V480 with ful US III crashes with FATAL exception in different point of startup so I do not know about it. > [ 54.571516] CPU: 1 PID: 1 Comm: init Not tainted 3.16.0-rc2-00211-gd7933ab #96 > [ 54.666431] Call Trace: > [ 54.698453] [0000000000762f8c] panic+0xb0/0x224 > [ 54.759071] [000000000045cf68] do_exit+0x948/0x960 > [ 54.823123] [000000000042cbc0] fault_in_user_windows+0xe0/0x100 > [ 54.902036] [0000000000404ad0] __handle_user_windows+0x0/0x10 > [ 54.978662] Press Stop-A (L1-A) to return to the boot prom > [ 55.050713] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004 This is always the same. Below are the disassemblies of fault_in_user_windows from 4.6.4 and 4.9.0. >From gcc 4.6: 000000000042cac0 <fault_in_user_windows>: 42cac0: 9d e3 bf 50 save %sp, -176, %sp 42cac4: 7f ff 65 e7 call 406260 <__flushw_user> 42cac8: b0 10 00 06 mov %g6, %i0 42cacc: f8 09 a0 0d ldub [ %g6 + 0xd ], %i4 42cad0: 02 c7 00 29 brz,pn %i4, 42cb74 <fault_in_user_windows+0xb4> 42cad4: 82 10 00 06 mov %g6, %g1 42cad8: b6 07 20 77 add %i4, 0x77, %i3 42cadc: b8 07 3f ff add %i4, -1, %i4 42cae0: c2 58 60 08 ldx [ %g1 + 8 ], %g1 42cae4: b7 2e f0 03 sllx %i3, 3, %i3 42cae8: b3 2f 30 07 sllx %i4, 7, %i1 42caec: b6 06 00 1b add %i0, %i3, %i3 42caf0: b2 06 00 19 add %i0, %i1, %i1 42caf4: b6 06 e0 08 add %i3, 8, %i3 42caf8: b2 06 60 48 add %i1, 0x48, %i1 42cafc: 82 08 60 80 and %g1, 0x80, %g1 42cb00: 02 c8 40 19 brz %g1, 42cb64 <fault_in_user_windows+0xa4> 42cb04: fa 5e c0 00 ldx [ %i3 ], %i5 42cb08: 82 0f 60 01 and %i5, 1, %g1 42cb0c: 0a c8 40 16 brnz %g1, 42cb64 <fault_in_user_windows+0xa4> 42cb10: b4 10 20 40 mov 0x40, %i2 42cb14: 82 0f 60 07 and %i5, 7, %g1 42cb18: 0a c0 40 22 brnz,pn %g1, 42cba0 <fault_in_user_windows+0xe0> 42cb1c: 01 00 00 00 nop 42cb20: 90 10 00 1d mov %i5, %o0 42cb24: 92 10 00 19 mov %i1, %o1 42cb28: 40 07 63 56 call 605880 <___copy_to_user> 42cb2c: 94 10 00 1a mov %i2, %o2 42cb30: 0a c2 00 14 brnz,pn %o0, 42cb80 <fault_in_user_windows+0xc0> 42cb34: 90 10 00 1d mov %i5, %o0 42cb38: 02 c7 00 0e brz,pn %i4, 42cb70 <fault_in_user_windows+0xb0> 42cb3c: b6 06 ff f8 add %i3, -8, %i3 42cb40: b8 07 3f ff add %i4, -1, %i4 42cb44: 82 10 00 06 mov %g6, %g1 42cb48: fa 5e c0 00 ldx [ %i3 ], %i5 42cb4c: b3 2f 30 07 sllx %i4, 7, %i1 42cb50: c2 58 60 08 ldx [ %g1 + 8 ], %g1 42cb54: b2 06 00 19 add %i0, %i1, %i1 42cb58: 82 08 60 80 and %g1, 0x80, %g1 42cb5c: 0a f8 7f eb brnz %g1, 42cb08 <fault_in_user_windows+0x48> 42cb60: b2 06 60 48 add %i1, 0x48, %i1 42cb64: ba 07 67 ff add %i5, 0x7ff, %i5 42cb68: 10 6f ff eb b %xcc, 42cb14 <fault_in_user_windows+0x54> 42cb6c: b4 10 20 80 mov 0x80, %i2 42cb70: 82 10 00 06 mov %g6, %g1 42cb74: c0 28 60 0d clrb [ %g1 + 0xd ] 42cb78: 81 cf e0 08 rett %i7 + 8 42cb7c: 01 00 00 00 nop 42cb80: 92 10 00 19 mov %i1, %o1 42cb84: 40 07 71 7f call 609180 <copy_to_user_fixup> 42cb88: 94 10 00 1a mov %i2, %o2 42cb8c: 02 f2 3f eb brz,pn %o0, 42cb38 <fault_in_user_windows+0x78> 42cb90: 90 10 20 04 mov 4, %o0 42cb94: b8 07 20 01 inc %i4 42cb98: 40 00 bf d2 call 45cae0 <do_exit> 42cb9c: f8 29 a0 0d stb %i4, [ %g6 + 0xd ] 42cba0: 7f ff fd b0 call 42c260 <stack_unaligned> 42cba4: 90 10 00 1d mov %i5, %o0 42cba8: 10 6f ff df b %xcc, 42cb24 <fault_in_user_windows+0x64> 42cbac: 90 10 00 1d mov %i5, %o0 42cbb0: 30 68 00 04 b,a %xcc, 42cbc0 <sparc_do_fork> 42cbb4: 01 00 00 00 nop 42cbb8: 01 00 00 00 nop 42cbbc: 01 00 00 00 nop >From gcc 4.9: 000000000042cae0 <fault_in_user_windows>: 42cae0: 9d e3 bf 50 save %sp, -176, %sp 42cae4: 7f ff 65 df call 406260 <__flushw_user> 42cae8: b6 10 00 06 mov %g6, %i3 42caec: f8 09 a0 0d ldub [ %g6 + 0xd ], %i4 42caf0: 83 2f 30 07 sllx %i4, 7, %g1 42caf4: 84 10 00 1c mov %i4, %g2 42caf8: 82 00 7f c8 add %g1, -56, %g1 42cafc: b9 2f 30 03 sllx %i4, 3, %i4 42cb00: b8 06 c0 1c add %i3, %i4, %i4 42cb04: b4 00 bf ff add %g2, -1, %i2 42cb08: 02 c0 80 30 brz,pn %g2, 42cbc8 <fault_in_user_windows+0xe8> 42cb0c: b6 06 c0 01 add %i3, %g1, %i3 42cb10: c2 59 a0 08 ldx [ %g6 + 8 ], %g1 42cb14: 82 08 60 80 and %g1, 0x80, %g1 42cb18: 02 c8 40 17 brz %g1, 42cb74 <fault_in_user_windows+0x94> 42cb1c: fa 5f 23 c0 ldx [ %i4 + 0x3c0 ], %i5 42cb20: 82 0f 60 01 and %i5, 1, %g1 42cb24: 0a c8 40 14 brnz %g1, 42cb74 <fault_in_user_windows+0x94> 42cb28: b2 10 20 40 mov 0x40, %i1 42cb2c: 82 0f 60 07 and %i5, 7, %g1 42cb30: 0a c0 40 15 brnz,pn %g1, 42cb84 <fault_in_user_windows+0xa4> 42cb34: 01 00 00 00 nop 42cb38: 90 10 00 1d mov %i5, %o0 42cb3c: 92 10 00 1b mov %i3, %o1 42cb40: 40 07 73 c0 call 609a40 <___copy_to_user> 42cb44: 94 10 00 19 mov %i1, %o2 42cb48: 0a c2 00 18 brnz,pn %o0, 42cba8 <fault_in_user_windows+0xc8> 42cb4c: 90 10 00 1d mov %i5, %o0 42cb50: 82 06 bf ff add %i2, -1, %g1 42cb54: b8 07 3f f8 add %i4, -8, %i4 42cb58: 02 c6 80 1c brz,pn %i2, 42cbc8 <fault_in_user_windows+0xe8> 42cb5c: b6 06 ff 80 add %i3, -128, %i3 42cb60: b4 10 00 01 mov %g1, %i2 42cb64: c2 59 a0 08 ldx [ %g6 + 8 ], %g1 42cb68: 82 08 60 80 and %g1, 0x80, %g1 42cb6c: 0a f8 7f ed brnz %g1, 42cb20 <fault_in_user_windows+0x40> 42cb70: fa 5f 23 c0 ldx [ %i4 + 0x3c0 ], %i5 42cb74: ba 07 67 ff add %i5, 0x7ff, %i5 42cb78: 82 0f 60 07 and %i5, 7, %g1 42cb7c: 02 f8 7f ef brz %g1, 42cb38 <fault_in_user_windows+0x58> 42cb80: b2 10 20 80 mov 0x80, %i1 42cb84: 7f ff fc cf call 42bec0 <stack_unaligned> 42cb88: 90 10 00 1d mov %i5, %o0 42cb8c: 90 10 00 1d mov %i5, %o0 42cb90: 92 10 00 1b mov %i3, %o1 42cb94: 40 07 73 ab call 609a40 <___copy_to_user> 42cb98: 94 10 00 19 mov %i1, %o2 42cb9c: 02 fa 3f ee brz %o0, 42cb54 <fault_in_user_windows+0x74> 42cba0: 82 06 bf ff add %i2, -1, %g1 42cba4: 90 10 00 1d mov %i5, %o0 42cba8: 92 10 00 1b mov %i3, %o1 42cbac: 40 07 81 e5 call 60d340 <copy_to_user_fixup> 42cbb0: 94 10 00 19 mov %i1, %o2 42cbb4: 02 f2 3f e7 brz,pn %o0, 42cb50 <fault_in_user_windows+0x70> 42cbb8: 90 10 20 04 mov 4, %o0 42cbbc: b4 06 a0 01 inc %i2 42cbc0: 40 00 be 98 call 45c620 <do_exit> 42cbc4: f4 29 a0 0d stb %i2, [ %g6 + 0xd ] 42cbc8: c0 29 a0 0d clrb [ %g6 + 0xd ] 42cbcc: 81 cf e0 08 rett %i7 + 8 42cbd0: 01 00 00 00 nop 42cbd4: 30 68 00 03 b,a %xcc, 42cbe0 <sparc_do_fork> 42cbd8: 01 00 00 00 nop 42cbdc: 01 00 00 00 nop -- Meelis Roos (mroos@xxxxxxxx) -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
