* Kernel completely crashes after accessing an unmapped area.
@ 2008-11-19 12:59 Ricardo
2008-11-21 9:17 ` Benjamin Herrenschmidt
0 siblings, 1 reply; 4+ messages in thread
From: Ricardo @ 2008-11-19 12:59 UTC (permalink / raw)
To: linuxppc-dev
Hello All:
I am using the paulus tree popwerpc linux kernel for a ppc440 cpu
located in a Virtex5 FPGA.
While developing some drivers (a simple gpio device) I have notice
that if I try to access an unmapped area (an address without any
register/device attached), the system completely crashes... I remember
that doing the same with a ppc400 cpu the system showed a
"Instruction/Data bus error" and continue working.
My question: The ppc440 cannot recover from this types of errors or
is a kernel missing feature/bug?
Thanks and Best regards
[ 24.770976] Oops: Machine check, sig: 7 [#1]
[ 24.773932] PREEMPT Xilinx Virtex440
[ 24.777473] Modules linked in: spidev xilinx_spi spi_bitbang
[ 24.783093] NIP: 00000000 LR: 10000858 CTR: c015ba80
[ 24.788022] REGS: c3ffdf10 TRAP: 0202 Not tainted (2.6.27)
[ 24.793716] MSR: 00000000 <> CR: 22000422 XER: 20000000
[ 24.799077] TASK = c38d7000[2109] 'md.l' THREAD: c33ce000
[ 24.804258] GPR00: a5a5a5a5 bf8bcb40 48026480 4801e000 10000858 22000424 480
[ 24.812552] GPR08: 0002d000 4801e000 00000000 c33ce000 c33ce000 10018ea0 03f
[ 24.820846] GPR16: dbfa3fff 00000000 00000000 00000000 00000000 00000000 100
[ 24.829140] GPR24: 4800e454 bf8bce00 00000002 bf8bce14 00000000 4802cce0 0ff
[ 24.837614] NIP [00000000] 0x0
[ 24.840634] LR [10000858] 0x10000858
[ 24.844174] Call Trace:
[ 24.846594] Instruction dump:
[ 24.849532] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 24.857220] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 24.864915] ---[ end trace 90dba81f5381e59d ]---
[ 24.869505] Oops: Machine check, sig: 7 [#2]
[ 24.873722] PREEMPT Xilinx Virtex440
[ 24.877265] Modules linked in: spidev xilinx_spi spi_bitbang
[ 24.882883] NIP: 00000000 LR: c000da24 CTR: 00018486
[ 24.887812] REGS: c3ffdf10 TRAP: 0202 Tainted: G D (2.6.27)
[ 24.894199] MSR: 00000000 <> CR: 44040428 XER: 00000000
[ 24.899559] TASK = c38d7000[2109] 'md.l' THREAD: c33ce000
[ 24.904740] GPR00: 08000000 c3ffdd00 c38d7000 c3ffdd10 00000001 00000000 000
[ 24.913035] GPR08: 00000034 c000da24 00021002 c000a150 c38d7208 10018ea0 03f
[ 24.921329] GPR16: dbfa3fff 00000000 00000000 00000000 00000000 00000000 100
[ 24.929624] GPR24: c3ffc034 00000001 c030a798 c030a7a4 c3ffc000 c030a89c c02
[ 24.938093] NIP [00000000] 0x0
[ 24.941133] LR [c000da24] ret_from_except+0x0/0x18
[ 24.945866] Call Trace:
[ 24.948286] Instruction dump:
[ 24.951223] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 24.958913] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 24.966604] ---[ end trace 90dba81f5381e59d ]---
[ 24.971183] Fixing recursive fault but reboot is needed!
[ 24.976476] Oops: Machine check, sig: 7 [#3]
[ 24.980685] PREEMPT Xilinx Virtex440
[ 24.984228] Modules linked in: spidev xilinx_spi spi_bitbang
[ 24.989847] NIP: 00000000 LR: c000da24 CTR: c0029e78
[ 24.994775] REGS: c3ffdf10 TRAP: 0202 Tainted: G D (2.6.27)
[ 25.001163] MSR: 00000000 <> CR: 442f2082 XER: 00000000
[ 25.006523] TASK = c3822400[3] 'ksoftirqd/0' THREAD: c382c000
[ 25.012049] GPR00: 00000000 c382de80 c3822400 c382de90 c38d7000 c0302c70 000
[ 25.020344] GPR08: 00000098 c000da24 00021002 c0003ee4 c3822608 8fdd0dff c03
[ 25.028638] GPR16: c0302c40 c3822558 c382c034 c02e0000 c0302c40 c0300000 c03
[ 25.036933] GPR24: c0040000 c02e506c c3285ba0 c382c000 c02e24b0 00000002 c38
[ 25.045401] NIP [00000000] 0x0
[ 25.048430] LR [c000da24] ret_from_except+0x0/0x18
[ 25.053175] Call Trace:
[ 25.055599] [c382de80] [c3822400] 0xc3822400 (unreliable)
[ 25.060967] [c382df40] [c0006310] __switch_to+0x54/0x78
[ 25.066146] [c382df60] [c02450c0] schedule+0x194/0x3ac
[ 25.071243] [c382dfb0] [c0033098] ksoftirqd+0x108/0x194
[ 25.076436] [c382dfd0] [c0045504] kthread+0x48/0x84
[ 25.081264] [c382dff0] [c000d1a0] kernel_thread+0x4c/0x68
[ 25.086612] Instruction dump:
[ 25.089549] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.097239] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.104931] ---[ end trace 90dba81f5381e59d ]---
[ 25.109512] note: ksoftirqd/0[3] exited with preempt_count 2
[ 25.115136] Oops: Machine check, sig: 7 [#4]
[ 25.119357] PREEMPT Xilinx Virtex440
[ 25.122900] Modules linked in: spidev xilinx_spi spi_bitbang
[ 25.128519] NIP: 00000000 LR: c000da24 CTR: 00018486
[ 25.133447] REGS: c3ffdf10 TRAP: 0202 Tainted: G D (2.6.27)
[ 25.139835] MSR: 00000000 <> CR: 44242022 XER: 20000000
[ 25.145194] TASK = c3822400[3] 'ksoftirqd/0' THREAD: c382c000
[ 25.150721] GPR00: c003077c c3ffddc0 c3822400 c3ffddd0 00000000 00000000 000
[ 25.159016] GPR08: 00000036 c000da24 00021002 c0003ee4 c3822608 8fdd0dff c03
[ 25.167310] GPR16: c0302c40 c3822558 c382c034 c02e0000 c0302c40 c0300000 c03
[ 25.175605] GPR24: c38224e0 c38224f4 c3822c00 c3ffdf10 c3ffc000 c38224e0 c38
[ 25.184073] NIP [00000000] 0x0
[ 25.187102] LR [c000da24] ret_from_except+0x0/0x18
[ 25.191847] Call Trace:
[ 25.194266] Instruction dump:
[ 25.197204] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.204893] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.212585] ---[ end trace 90dba81f5381e59d ]---
[ 25.217164] Fixing recursive fault but reboot is needed!
[ 25.222437] BUG: scheduling while atomic: ksoftirqd/0/3/0x00000003
[ 25.228567] Modules linked in: spidev xilinx_spi spi_bitbang
[ 25.234184] Call Trace:
[ 25.236610] Oops: Machine check, sig: 7 [#5]
[ 25.240836] PREEMPT Xilinx Virtex440
[ 25.244378] Modules linked in: spidev xilinx_spi spi_bitbang
[ 25.249997] NIP: 00000000 LR: c000da24 CTR: c0029e78
[ 25.254925] REGS: c3ffdf10 TRAP: 0202 Tainted: G D (2.6.27)
[ 25.261313] MSR: 00000000 <> CR: 442f2022 XER: 00000000
[ 25.266673] TASK = c3822000[4] 'events/0' THREAD: c382e000
[ 25.271940] GPR00: 00000000 c382fe60 c3822000 c382fe70 c3822400 c0302c70 000
[ 25.280235] GPR08: 00000131 c000da24 00021002 c0003ee4 c3822208 8fdd0dff c03
[ 25.288529] GPR16: c0302c40 c3822158 c382e034 c02e0000 c0302c40 c0300000 c03
[ 25.296824] GPR24: c0040000 c02e506c c3285ba0 c382e000 c3842000 00000002 c38
[ 25.305293] NIP [00000000] 0x0
[ 25.308321] LR [c000da24] ret_from_except+0x0/0x18
[ 25.313066] Call Trace:
[ 25.315509] [c382fe60] [c016374c] n_tty_receive_buf+0x2b8/0xf68 (unreliable)
[ 25.322492] [c382ff20] [c0006310] __switch_to+0x54/0x78
[ 25.327674] [c382ff40] [c02450c0] schedule+0x194/0x3ac
[ 25.332774] [c382ff90] [c0041684] worker_thread+0x9c/0xd0
[ 25.338130] [c382ffd0] [c0045504] kthread+0x48/0x84
[ 25.342968] [c382fff0] [c000d1a0] kernel_thread+0x4c/0x68
[ 25.348318] Instruction dump:
[ 25.351255] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.358945] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.366636] ---[ end trace 90dba81f5381e59d ]---
[ 25.371217] note: events/0[4] exited with preempt_count 2
[ 25.376577] Oops: Machine check, sig: 7 [#6]
[ 25.380804] PREEMPT Xilinx Virtex440
[ 25.384346] Modules linked in: spidev xilinx_spi spi_bitbang
[ 25.389965] NIP: 00000000 LR: c000da24 CTR: 00018486
[ 25.394893] REGS: c3ffdf10 TRAP: 0202 Tainted: G D (2.6.27)
[ 25.401281] MSR: 00000000 <> CR: 44242022 XER: 20000000
[ 25.406641] TASK = c3822000[4] 'events/0' THREAD: c382e000
[ 25.411908] GPR00: c003077c c3ffddc0 c3822000 c3ffddd0 00000000 00000000 000
[ 25.420203] GPR08: 00000036 c000da24 00021002 c0003ee4 c3822208 8fdd0dff c03
[ 25.428497] GPR16: c0302c40 c3822158 c382e034 c02e0000 c0302c40 c0300000 c03
[ 25.436792] GPR24: c38220e0 c38220f4 c3822c00 c3ffdf10 c3ffc000 c38220e0 c38
[ 25.445261] NIP [00000000] 0x0
[ 25.448289] LR [c000da24] ret_from_except+0x0/0x18
[ 25.453034] Call Trace:
[ 25.455454] Instruction dump:
[ 25.458391] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.466081] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.473772] ---[ end trace 90dba81f5381e59d ]---
[ 25.478351] Fixing recursive fault but reboot is needed!
[ 25.483623] BUG: scheduling while atomic: events/0/4/0x00000003
[ 25.489495] Modules linked in: spidev xilinx_spi spi_bitbang
[ 25.495111] Call Trace:
[ 25.497540] Oops: Machine check, sig: 7 [#7]
[ 25.501764] PREEMPT Xilinx Virtex440
[ 25.505306] Modules linked in: spidev xilinx_spi spi_bitbang
[ 25.510925] NIP: 00000000 LR: c000da24 CTR: c0026934
[ 25.515853] REGS: c3ffdf10 TRAP: 0202 Tainted: G D (2.6.27)
[ 25.522241] MSR: 00000000 <> CR: 442f2022 XER: 00000000
[ 25.527601] TASK = c02e24b0[0] 'swapper' THREAD: c02fa000
[ 25.532782] GPR00: 00000000 c02fbe50 c02e24b0 c02fbe60 c3822000 c3822030 000
[ 25.541077] GPR08: 00000000 c000da24 00021002 c0003ee4 c02e26b8 8fdd0dff c03
[ 25.549371] GPR16: c0302c40 c02e2608 c02fa034 00000000 c0302c40 c0300000 c03
[ 25.557665] GPR24: 00000000 03ff8ca4 c3285ba0 c02fa000 c3822000 00000002 c38
[ 25.566134] NIP [00000000] 0x0
[ 25.569163] LR [c000da24] ret_from_except+0x0/0x18
[ 25.573908] Call Trace:
[ 25.576334] [c02fbe50] [c003327c] __do_softirq+0x78/0xe4 (unreliable)
[ 25.582728] [c02fbf10] [c0006310] __switch_to+0x54/0x78
[ 25.587911] [c02fbf30] [c02450c0] schedule+0x194/0x3ac
[ 25.593011] [c02fbf80] [c0006cac] cpu_idle+0xcc/0xe8
[ 25.597940] [c02fbfa0] [c0247474] __got2_end+0x7c/0x90
[ 25.603036] [c02fbfc0] [c02bc804] start_kernel+0x238/0x2b8
[ 25.608475] [c02fbff0] [c00001e8] skpinv+0x190/0x1cc
[ 25.613393] Instruction dump:
[ 25.616330] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.624020] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.631712] ---[ end trace 90dba81f5381e59d ]---
[ 25.636293] Kernel panic - not syncing: Attempted to kill the idle task!
[ 25.642945] Rebooting in 180 seconds..Oops: Exception in kernel mode, sig: 1]
[ 205.666054] PREEMPT Xilinx Virtex440
[ 205.669593] Modules linked in: spidev xilinx_spi spi_bitbang
[ 205.675213] NIP: fffffffc LR: c000c0d8 CTR: c001593c
[ 205.680144] REGS: c3ffdd60 TRAP: 0700 Tainted: G D (2.6.27)
[ 205.686528] MSR: 00000000 <> CR: 222f2088 XER: 20000000
[ 205.691887] TASK = c02e24b0[0] 'swapper' THREAD: c02fa000
[ 205.697069] GPR00: 30000000 c3ffde10 c02e24b0 00000000 0000002e 00000029 c01
[ 205.705363] GPR08: 00000030 c0300000 0000462d c0300000 842f2042 8fdd0dff c03
[ 205.713658] GPR16: c0302c40 c02e2608 c02fa034 00000000 c0302c40 c0300000 c03
[ 205.721952] GPR24: 00000000 03ff8ca4 00000007 c3ffdf10 0002bf20 00000001 c03
[ 205.730426] NIP [fffffffc] 0xfffffffc
[ 205.734058] LR [c000c0d8] machine_restart+0x34/0x48
[ 205.738886] Call Trace:
[ 205.741306] Instruction dump:
[ 205.744244] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 205.751932] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 205.759627] ---[ end trace 90dba81f5381e59d ]---
[ 205.764206] Kernel panic - not syncing: Attempted to kill the idle task!
[ 205.770857] Rebooting in 180 seconds..Oops: Exception in kernel mode, sig: 1]
[ 385.793958] PREEMPT Xilinx Virtex440
[ 385.797497] Modules linked in: spidev xilinx_spi spi_bitbang
[ 385.803117] NIP: fffffffc LR: c000c0d8 CTR: c001593c
[ 385.808048] REGS: c3ffdae0 TRAP: 0700 Tainted: G D (2.6.27)
[ 385.814432] MSR: 00000000 <> CR: 222f2088 XER: 20000000
[ 385.819791] TASK = c02e24b0[0] 'swapper' THREAD: c02fa000
[ 385.824973] GPR00: 30000000 c3ffdb90 c02e24b0 00000000 0000002e 00000029 c01
[ 385.833267] GPR08: 00000030 c0300000 00004b67 c0300000 842f2042 8fdd0dff c03
[ 385.841561] GPR16: c0302c40 c02e2608 c02fa034 00000000 c0302c40 c0300000 c03
[ 385.849856] GPR24: 00000000 03ff8ca4 0000000b c3ffdd60 0002bf20 00000001 c03
[ 385.858330] NIP [fffffffc] 0xfffffffc
[ 385.861960] LR [c000c0d8] machine_restart+0x34/0x48
[ 385.866790] Call Trace:
[ 385.869209] Instruction dump:
[ 385.872148] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 385.879836] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 385.887531] ---[ end trace 90dba81f5381e59d ]---
[ 385.892109] Kernel panic - not syncing: Attempted to kill the idle task!
[ 385.898761] Rebooting in 180 seconds..Oops: Exception in kernel mode, sig: 1]
--
Ricardo Ribalda
http://www.eps.uam.es/~rribalda/
^ permalink raw reply [flat|nested] 4+ messages in thread
* Kernel completely crashes after accessing an unmapped area.
@ 2008-11-20 12:11 Ricardo
0 siblings, 0 replies; 4+ messages in thread
From: Ricardo @ 2008-11-20 12:11 UTC (permalink / raw)
To: linuxppc-embedded
Hello All:
I am using the paulus tree popwerpc linux kernel for a ppc440 cpu
located in a Virtex5 FPGA.
While developing some drivers (a simple gpio device) I have notice
that if I try to access an unmapped area (an address without any
register/device attached), the system completely crashes... I remember
that doing the same with a ppc400 cpu the system showed a
"Instruction/Data bus error" and continue working.
My question: The ppc440 cannot recover from this types of errors or
is a kernel missing feature/bug?
Thanks and Best regards
[ 24.770976] Oops: Machine check, sig: 7 [#1]
[ 24.773932] PREEMPT Xilinx Virtex440
[ 24.777473] Modules linked in: spidev xilinx_spi spi_bitbang
[ 24.783093] NIP: 00000000 LR: 10000858 CTR: c015ba80
[ 24.788022] REGS: c3ffdf10 TRAP: 0202 Not tainted (2.6.27)
[ 24.793716] MSR: 00000000 <> CR: 22000422 XER: 20000000
[ 24.799077] TASK = c38d7000[2109] 'md.l' THREAD: c33ce000
[ 24.804258] GPR00: a5a5a5a5 bf8bcb40 48026480 4801e000 10000858 22000424 480
[ 24.812552] GPR08: 0002d000 4801e000 00000000 c33ce000 c33ce000 10018ea0 03f
[ 24.820846] GPR16: dbfa3fff 00000000 00000000 00000000 00000000 00000000 100
[ 24.829140] GPR24: 4800e454 bf8bce00 00000002 bf8bce14 00000000 4802cce0 0ff
[ 24.837614] NIP [00000000] 0x0
[ 24.840634] LR [10000858] 0x10000858
[ 24.844174] Call Trace:
[ 24.846594] Instruction dump:
[ 24.849532] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 24.857220] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 24.864915] ---[ end trace 90dba81f5381e59d ]---
[ 24.869505] Oops: Machine check, sig: 7 [#2]
[ 24.873722] PREEMPT Xilinx Virtex440
[ 24.877265] Modules linked in: spidev xilinx_spi spi_bitbang
[ 24.882883] NIP: 00000000 LR: c000da24 CTR: 00018486
[ 24.887812] REGS: c3ffdf10 TRAP: 0202 Tainted: G D (2.6.27)
[ 24.894199] MSR: 00000000 <> CR: 44040428 XER: 00000000
[ 24.899559] TASK = c38d7000[2109] 'md.l' THREAD: c33ce000
[ 24.904740] GPR00: 08000000 c3ffdd00 c38d7000 c3ffdd10 00000001 00000000 000
[ 24.913035] GPR08: 00000034 c000da24 00021002 c000a150 c38d7208 10018ea0 03f
[ 24.921329] GPR16: dbfa3fff 00000000 00000000 00000000 00000000 00000000 100
[ 24.929624] GPR24: c3ffc034 00000001 c030a798 c030a7a4 c3ffc000 c030a89c c02
[ 24.938093] NIP [00000000] 0x0
[ 24.941133] LR [c000da24] ret_from_except+0x0/0x18
[ 24.945866] Call Trace:
[ 24.948286] Instruction dump:
[ 24.951223] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 24.958913] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 24.966604] ---[ end trace 90dba81f5381e59d ]---
[ 24.971183] Fixing recursive fault but reboot is needed!
[ 24.976476] Oops: Machine check, sig: 7 [#3]
[ 24.980685] PREEMPT Xilinx Virtex440
[ 24.984228] Modules linked in: spidev xilinx_spi spi_bitbang
[ 24.989847] NIP: 00000000 LR: c000da24 CTR: c0029e78
[ 24.994775] REGS: c3ffdf10 TRAP: 0202 Tainted: G D (2.6.27)
[ 25.001163] MSR: 00000000 <> CR: 442f2082 XER: 00000000
[ 25.006523] TASK = c3822400[3] 'ksoftirqd/0' THREAD: c382c000
[ 25.012049] GPR00: 00000000 c382de80 c3822400 c382de90 c38d7000 c0302c70 000
[ 25.020344] GPR08: 00000098 c000da24 00021002 c0003ee4 c3822608 8fdd0dff c03
[ 25.028638] GPR16: c0302c40 c3822558 c382c034 c02e0000 c0302c40 c0300000 c03
[ 25.036933] GPR24: c0040000 c02e506c c3285ba0 c382c000 c02e24b0 00000002 c38
[ 25.045401] NIP [00000000] 0x0
[ 25.048430] LR [c000da24] ret_from_except+0x0/0x18
[ 25.053175] Call Trace:
[ 25.055599] [c382de80] [c3822400] 0xc3822400 (unreliable)
[ 25.060967] [c382df40] [c0006310] __switch_to+0x54/0x78
[ 25.066146] [c382df60] [c02450c0] schedule+0x194/0x3ac
[ 25.071243] [c382dfb0] [c0033098] ksoftirqd+0x108/0x194
[ 25.076436] [c382dfd0] [c0045504] kthread+0x48/0x84
[ 25.081264] [c382dff0] [c000d1a0] kernel_thread+0x4c/0x68
[ 25.086612] Instruction dump:
[ 25.089549] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.097239] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.104931] ---[ end trace 90dba81f5381e59d ]---
[ 25.109512] note: ksoftirqd/0[3] exited with preempt_count 2
[ 25.115136] Oops: Machine check, sig: 7 [#4]
[ 25.119357] PREEMPT Xilinx Virtex440
[ 25.122900] Modules linked in: spidev xilinx_spi spi_bitbang
[ 25.128519] NIP: 00000000 LR: c000da24 CTR: 00018486
[ 25.133447] REGS: c3ffdf10 TRAP: 0202 Tainted: G D (2.6.27)
[ 25.139835] MSR: 00000000 <> CR: 44242022 XER: 20000000
[ 25.145194] TASK = c3822400[3] 'ksoftirqd/0' THREAD: c382c000
[ 25.150721] GPR00: c003077c c3ffddc0 c3822400 c3ffddd0 00000000 00000000 000
[ 25.159016] GPR08: 00000036 c000da24 00021002 c0003ee4 c3822608 8fdd0dff c03
[ 25.167310] GPR16: c0302c40 c3822558 c382c034 c02e0000 c0302c40 c0300000 c03
[ 25.175605] GPR24: c38224e0 c38224f4 c3822c00 c3ffdf10 c3ffc000 c38224e0 c38
[ 25.184073] NIP [00000000] 0x0
[ 25.187102] LR [c000da24] ret_from_except+0x0/0x18
[ 25.191847] Call Trace:
[ 25.194266] Instruction dump:
[ 25.197204] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.204893] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.212585] ---[ end trace 90dba81f5381e59d ]---
[ 25.217164] Fixing recursive fault but reboot is needed!
[ 25.222437] BUG: scheduling while atomic: ksoftirqd/0/3/0x00000003
[ 25.228567] Modules linked in: spidev xilinx_spi spi_bitbang
[ 25.234184] Call Trace:
[ 25.236610] Oops: Machine check, sig: 7 [#5]
[ 25.240836] PREEMPT Xilinx Virtex440
[ 25.244378] Modules linked in: spidev xilinx_spi spi_bitbang
[ 25.249997] NIP: 00000000 LR: c000da24 CTR: c0029e78
[ 25.254925] REGS: c3ffdf10 TRAP: 0202 Tainted: G D (2.6.27)
[ 25.261313] MSR: 00000000 <> CR: 442f2022 XER: 00000000
[ 25.266673] TASK = c3822000[4] 'events/0' THREAD: c382e000
[ 25.271940] GPR00: 00000000 c382fe60 c3822000 c382fe70 c3822400 c0302c70 000
[ 25.280235] GPR08: 00000131 c000da24 00021002 c0003ee4 c3822208 8fdd0dff c03
[ 25.288529] GPR16: c0302c40 c3822158 c382e034 c02e0000 c0302c40 c0300000 c03
[ 25.296824] GPR24: c0040000 c02e506c c3285ba0 c382e000 c3842000 00000002 c38
[ 25.305293] NIP [00000000] 0x0
[ 25.308321] LR [c000da24] ret_from_except+0x0/0x18
[ 25.313066] Call Trace:
[ 25.315509] [c382fe60] [c016374c] n_tty_receive_buf+0x2b8/0xf68 (unreliable)
[ 25.322492] [c382ff20] [c0006310] __switch_to+0x54/0x78
[ 25.327674] [c382ff40] [c02450c0] schedule+0x194/0x3ac
[ 25.332774] [c382ff90] [c0041684] worker_thread+0x9c/0xd0
[ 25.338130] [c382ffd0] [c0045504] kthread+0x48/0x84
[ 25.342968] [c382fff0] [c000d1a0] kernel_thread+0x4c/0x68
[ 25.348318] Instruction dump:
[ 25.351255] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.358945] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.366636] ---[ end trace 90dba81f5381e59d ]---
[ 25.371217] note: events/0[4] exited with preempt_count 2
[ 25.376577] Oops: Machine check, sig: 7 [#6]
[ 25.380804] PREEMPT Xilinx Virtex440
[ 25.384346] Modules linked in: spidev xilinx_spi spi_bitbang
[ 25.389965] NIP: 00000000 LR: c000da24 CTR: 00018486
[ 25.394893] REGS: c3ffdf10 TRAP: 0202 Tainted: G D (2.6.27)
[ 25.401281] MSR: 00000000 <> CR: 44242022 XER: 20000000
[ 25.406641] TASK = c3822000[4] 'events/0' THREAD: c382e000
[ 25.411908] GPR00: c003077c c3ffddc0 c3822000 c3ffddd0 00000000 00000000 000
[ 25.420203] GPR08: 00000036 c000da24 00021002 c0003ee4 c3822208 8fdd0dff c03
[ 25.428497] GPR16: c0302c40 c3822158 c382e034 c02e0000 c0302c40 c0300000 c03
[ 25.436792] GPR24: c38220e0 c38220f4 c3822c00 c3ffdf10 c3ffc000 c38220e0 c38
[ 25.445261] NIP [00000000] 0x0
[ 25.448289] LR [c000da24] ret_from_except+0x0/0x18
[ 25.453034] Call Trace:
[ 25.455454] Instruction dump:
[ 25.458391] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.466081] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.473772] ---[ end trace 90dba81f5381e59d ]---
[ 25.478351] Fixing recursive fault but reboot is needed!
[ 25.483623] BUG: scheduling while atomic: events/0/4/0x00000003
[ 25.489495] Modules linked in: spidev xilinx_spi spi_bitbang
[ 25.495111] Call Trace:
[ 25.497540] Oops: Machine check, sig: 7 [#7]
[ 25.501764] PREEMPT Xilinx Virtex440
[ 25.505306] Modules linked in: spidev xilinx_spi spi_bitbang
[ 25.510925] NIP: 00000000 LR: c000da24 CTR: c0026934
[ 25.515853] REGS: c3ffdf10 TRAP: 0202 Tainted: G D (2.6.27)
[ 25.522241] MSR: 00000000 <> CR: 442f2022 XER: 00000000
[ 25.527601] TASK = c02e24b0[0] 'swapper' THREAD: c02fa000
[ 25.532782] GPR00: 00000000 c02fbe50 c02e24b0 c02fbe60 c3822000 c3822030 000
[ 25.541077] GPR08: 00000000 c000da24 00021002 c0003ee4 c02e26b8 8fdd0dff c03
[ 25.549371] GPR16: c0302c40 c02e2608 c02fa034 00000000 c0302c40 c0300000 c03
[ 25.557665] GPR24: 00000000 03ff8ca4 c3285ba0 c02fa000 c3822000 00000002 c38
[ 25.566134] NIP [00000000] 0x0
[ 25.569163] LR [c000da24] ret_from_except+0x0/0x18
[ 25.573908] Call Trace:
[ 25.576334] [c02fbe50] [c003327c] __do_softirq+0x78/0xe4 (unreliable)
[ 25.582728] [c02fbf10] [c0006310] __switch_to+0x54/0x78
[ 25.587911] [c02fbf30] [c02450c0] schedule+0x194/0x3ac
[ 25.593011] [c02fbf80] [c0006cac] cpu_idle+0xcc/0xe8
[ 25.597940] [c02fbfa0] [c0247474] __got2_end+0x7c/0x90
[ 25.603036] [c02fbfc0] [c02bc804] start_kernel+0x238/0x2b8
[ 25.608475] [c02fbff0] [c00001e8] skpinv+0x190/0x1cc
[ 25.613393] Instruction dump:
[ 25.616330] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.624020] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 25.631712] ---[ end trace 90dba81f5381e59d ]---
[ 25.636293] Kernel panic - not syncing: Attempted to kill the idle task!
[ 25.642945] Rebooting in 180 seconds..Oops: Exception in kernel mode, sig: 1]
[ 205.666054] PREEMPT Xilinx Virtex440
[ 205.669593] Modules linked in: spidev xilinx_spi spi_bitbang
[ 205.675213] NIP: fffffffc LR: c000c0d8 CTR: c001593c
[ 205.680144] REGS: c3ffdd60 TRAP: 0700 Tainted: G D (2.6.27)
[ 205.686528] MSR: 00000000 <> CR: 222f2088 XER: 20000000
[ 205.691887] TASK = c02e24b0[0] 'swapper' THREAD: c02fa000
[ 205.697069] GPR00: 30000000 c3ffde10 c02e24b0 00000000 0000002e 00000029 c01
[ 205.705363] GPR08: 00000030 c0300000 0000462d c0300000 842f2042 8fdd0dff c03
[ 205.713658] GPR16: c0302c40 c02e2608 c02fa034 00000000 c0302c40 c0300000 c03
[ 205.721952] GPR24: 00000000 03ff8ca4 00000007 c3ffdf10 0002bf20 00000001 c03
[ 205.730426] NIP [fffffffc] 0xfffffffc
[ 205.734058] LR [c000c0d8] machine_restart+0x34/0x48
[ 205.738886] Call Trace:
[ 205.741306] Instruction dump:
[ 205.744244] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 205.751932] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 205.759627] ---[ end trace 90dba81f5381e59d ]---
[ 205.764206] Kernel panic - not syncing: Attempted to kill the idle task!
[ 205.770857] Rebooting in 180 seconds..Oops: Exception in kernel mode, sig: 1]
[ 385.793958] PREEMPT Xilinx Virtex440
[ 385.797497] Modules linked in: spidev xilinx_spi spi_bitbang
[ 385.803117] NIP: fffffffc LR: c000c0d8 CTR: c001593c
[ 385.808048] REGS: c3ffdae0 TRAP: 0700 Tainted: G D (2.6.27)
[ 385.814432] MSR: 00000000 <> CR: 222f2088 XER: 20000000
[ 385.819791] TASK = c02e24b0[0] 'swapper' THREAD: c02fa000
[ 385.824973] GPR00: 30000000 c3ffdb90 c02e24b0 00000000 0000002e 00000029 c01
[ 385.833267] GPR08: 00000030 c0300000 00004b67 c0300000 842f2042 8fdd0dff c03
[ 385.841561] GPR16: c0302c40 c02e2608 c02fa034 00000000 c0302c40 c0300000 c03
[ 385.849856] GPR24: 00000000 03ff8ca4 0000000b c3ffdd60 0002bf20 00000001 c03
[ 385.858330] NIP [fffffffc] 0xfffffffc
[ 385.861960] LR [c000c0d8] machine_restart+0x34/0x48
[ 385.866790] Call Trace:
[ 385.869209] Instruction dump:
[ 385.872148] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 385.879836] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX X
[ 385.887531] ---[ end trace 90dba81f5381e59d ]---
[ 385.892109] Kernel panic - not syncing: Attempted to kill the idle task!
[ 385.898761] Rebooting in 180 seconds..Oops: Exception in kernel mode, sig: 1]
--
Ricardo Ribalda
http://www.eps.uam.es/~rribalda/
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Kernel completely crashes after accessing an unmapped area.
2008-11-19 12:59 Ricardo
@ 2008-11-21 9:17 ` Benjamin Herrenschmidt
2009-01-08 11:38 ` Ricardo
0 siblings, 1 reply; 4+ messages in thread
From: Benjamin Herrenschmidt @ 2008-11-21 9:17 UTC (permalink / raw)
To: Ricardo; +Cc: linuxppc-dev
On Wed, 2008-11-19 at 13:59 +0100, Ricardo wrote:
> Hello All:
>
> I am using the paulus tree popwerpc linux kernel for a ppc440 cpu
> located in a Virtex5 FPGA.
>
> While developing some drivers (a simple gpio device) I have notice
> that if I try to access an unmapped area (an address without any
> register/device attached), the system completely crashes... I remember
> that doing the same with a ppc400 cpu the system showed a
> "Instruction/Data bus error" and continue working.
>
> My question: The ppc440 cannot recover from this types of errors or
> is a kernel missing feature/bug?
You may want to look at the patch I posted recently:
powerpc: Fix 460EX/460GT machine check handling
>From the look of your log, we aren't using the right type of machine
check handler for your core and it may need a similar treatement as the
above processors.
There are two kind of 440 cores vs. machine checks. On the old kind,
machine checks used to be critical interrupts (and thus used CSRR0 and
CSRR1 to save the context) while on the new kind, machine checks are
their own type of exception with a dedicated pair of context save
registers MCSRR0 and MCSRR1.
It -looks- like the problem might be that the kernel isn't using the
right set for your core. It uses by default the old style unless
you change the machine check IVOR to point to MachineCheckA
which is done by calling __fixup_440A_mcheck() in your CPU init routine
for example, as we do for other 440 cores.
So you would have to hook up a setup_cpu routine in cputable for
those guys (I can see the virtex cores seem to not have any at
this stage) and also change their machine check pointer to
use machine_check_440A instead of machine_check_4xx so the machine
check details are properly decoded.
Of course check your Virtex user manual to make sure that's indeed
what is happening :-)
Cheers,
Ben.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Kernel completely crashes after accessing an unmapped area.
2008-11-21 9:17 ` Benjamin Herrenschmidt
@ 2009-01-08 11:38 ` Ricardo
0 siblings, 0 replies; 4+ messages in thread
From: Ricardo @ 2009-01-08 11:38 UTC (permalink / raw)
To: Benjamin Herrenschmidt; +Cc: linuxppc-dev
Hello Benjamin
Thank you very much for your help. You are completely right, once I
have fixed the cputable everything worked like a charm. I have
reviewed the last git version and it seems solved there, so I wont
publish the patch in git format ( to avoid confusions)
Best regards
--- a/arch/powerpc/kernel/cputable.c
+++ b/arch/powerpc/kernel/cputable.c
@@ -1487,6 +1487,8 @@ static struct cpu_spec __initdata cpu_specs[] = {
.cpu_user_features = COMMON_USER_BOOKE,
.icache_bsize = 32,
.dcache_bsize = 32,
+ .cpu_setup = __setup_cpu_440spe,
+ .machine_check = machine_check_440A,
.platform = "ppc440",
},
{ /* 460EX */
root@Q5:~# md.l 0x80000000
[ 191.806370] Machine check in kernel mode.
[ 191.809078] Data Read PLB Error
[ 191.812194] Oops: Machine check, sig: 7 [#2]
[ 191.816419] PREEMPT Xilinx Virtex440
[ 191.819962] Modules linked in: reg_user
[ 191.823767] NIP: d106f16c LR: d106f128 CTR: c000f90c
[ 191.828699] REGS: cfff9f10 TRAP: 0214 Tainted: G D (2.6.27)
[ 191.835082] MSR: 00029000 <EE,ME> CR: 84000422 XER: 00000000
[ 191.840875] TASK = cf83d000[2969] 'md.l' THREAD: ce8a8000
[ 191.846055] GPR00: a5a5a5a5 ce8a9e50 cf83d000 d1072000 d1072000
00000000 80000000 0000051b
[ 191.854350] GPR08: 00000000 00000000 00000000 00000000 80000000
10018d78 fffda400 00000000
[ 191.862644] GPR16: ffbbfffc 00000000 00000004 0000003f 000001ff
00000000 1008d23c 1008d254
[ 191.870938] GPR24: 4800e454 bf820e00 00000002 40087100 40087100
c02e6bf0 40087100 bf820b70
[ 191.879421] NIP [d106f16c] reg_user_ioctl+0x16c/0x1c8 [reg_user]
[ 191.885375] LR [d106f128] reg_user_ioctl+0x128/0x1c8 [reg_user]
[ 191.891242] Call Trace:
[ 191.893670] [ce8a9e50] [d106f128] reg_user_ioctl+0x128/0x1c8
[reg_user] (unreliable)
[ 191.901364] [ce8a9e80] [c00956dc] vfs_ioctl+0x9c/0xa8
[ 191.906369] [ce8a9ea0] [c009576c] do_vfs_ioctl+0x84/0x68c
[ 191.911725] [ce8a9f10] [c0095db4] sys_ioctl+0x40/0x74
[ 191.916744] [ce8a9f40] [c000d3c4] ret_from_syscall+0x0/0x3c
[ 191.922260] Instruction dump:
[ 191.925200] 6fc04008 2f807100 419e0020 48000101 38600000 4bfffee8
3c60d107 3863f314
[ 191.932887] 480000bd 4bffffb8 7c0004ac 80030000 <0c000000> 4c00012c
9001000c 80020214
[ 191.940754] ---[ end trace af45d29b317f9126 ]---
Bus error
root@Q5:~# ls
On Fri, Nov 21, 2008 at 10:17, Benjamin Herrenschmidt
<benh@kernel.crashing.org> wrote:
> On Wed, 2008-11-19 at 13:59 +0100, Ricardo wrote:
>> Hello All:
>>
>> I am using the paulus tree popwerpc linux kernel for a ppc440 cpu
>> located in a Virtex5 FPGA.
>>
>> While developing some drivers (a simple gpio device) I have notice
>> that if I try to access an unmapped area (an address without any
>> register/device attached), the system completely crashes... I remember
>> that doing the same with a ppc400 cpu the system showed a
>> "Instruction/Data bus error" and continue working.
>>
>> My question: The ppc440 cannot recover from this types of errors or
>> is a kernel missing feature/bug?
>
> You may want to look at the patch I posted recently:
>
> powerpc: Fix 460EX/460GT machine check handling
>
> >From the look of your log, we aren't using the right type of machine
> check handler for your core and it may need a similar treatement as the
> above processors.
>
> There are two kind of 440 cores vs. machine checks. On the old kind,
> machine checks used to be critical interrupts (and thus used CSRR0 and
> CSRR1 to save the context) while on the new kind, machine checks are
> their own type of exception with a dedicated pair of context save
> registers MCSRR0 and MCSRR1.
>
> It -looks- like the problem might be that the kernel isn't using the
> right set for your core. It uses by default the old style unless
> you change the machine check IVOR to point to MachineCheckA
> which is done by calling __fixup_440A_mcheck() in your CPU init routine
> for example, as we do for other 440 cores.
>
> So you would have to hook up a setup_cpu routine in cputable for
> those guys (I can see the virtex cores seem to not have any at
> this stage) and also change their machine check pointer to
> use machine_check_440A instead of machine_check_4xx so the machine
> check details are properly decoded.
>
> Of course check your Virtex user manual to make sure that's indeed
> what is happening :-)
>
> Cheers,
> Ben.
>
>
--
Ricardo Ribalda
http://www.eps.uam.es/~rribalda/
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2009-01-08 11:40 UTC | newest]
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2008-11-21 9:17 ` Benjamin Herrenschmidt
2009-01-08 11:38 ` Ricardo
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