[#3898] showing processsor state via magic sysrq crashes the kernel

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[#3898] showing processsor state via magic sysrq crashes the kernel

Submitted By: Mike Frysinger

Open Date

2008-02-14 21:51:32     Close Date

2008-03-17 19:20:43

Priority:

Medium     Assignee:

Robin Getz

Status:

Closed     Fixed In Release:

N/A

Found In Release:

N/A     Release:

linux-2.6.24.2

Category:

N/A     Board:

N/A

Processor:

N/A     Silicon Revision:

Is this bug repeatable?:

Yes     Resolution:

Fixed

Uboot version or rev.:

    Toolchain version or rev.:

App binary format:

N/A     

Summary: showing processsor state via magic sysrq crashes the kernel

Details:

 

with current trunk, enabling magic sysrq and then trying to show the pc (break+p) will crash the kernel:

root:/> SysRq : Show Regs

 

SEQUENCER STATUS:               Not tainted

SEQSTAT: 00002000  IPEND: ffff  SYSCFG: 0006

  HWERRCAUSE: 0x0

  EXCAUSE   : 0x0

  physical IVG6 asserted : <0xffa00df4> { _evt_timer + 0x0 }

  physical IVG7 asserted : <0xffa00e0c> { _evt_evt7 + 0x0 }

  physical IVG8 asserted : <0xffa00e18> { _evt_evt8 + 0x0 }

  physical IVG9 asserted : <0xffa00e24> { _evt_evt9 + 0x0 }

  physical IVG10 asserted : <0xffa00e30> { _evt_evt10 + 0x0 }

  physical IVG11 asserted : <0xffa00e3c> { _evt_evt11 + 0x0 }

  physical IVG12 asserted : <0xffa00e48> { _evt_evt12 + 0x0 }

  physical IVG13 asserted : <0xffa00e54> { _evt_evt13 + 0x0 }

  physical IVG14 asserted : <0xffa00ae8> { _evt14_softirq + 0x0 }

  physical IVG15 asserted : <0xffa00e60> { _evt_system_call + 0x0 }

  logical irq   6 mapped  : <0xffa00250> { _timer_interrupt + 0x0 }

  logical irq  18 mapped  : <0x00095bf4> { _bfin_serial_rx_int + 0x0 }

  logical irq  19 mapped  : <0x00095e10> { _bfin_serial_tx_int + 0x0 }

  logical irq  24 mapped  : <0x0009eb90> { _bf537mac_interrupt + 0x0 }

RETE: <0x00000000> { _run_init_process + 0xfffff000 }

BUG: scheduling while atomic: swapper/0/0x04010000

 

SEQUENCER STATUS:               Not tainted

SEQSTAT: 00002000  IPEND: ffff  SYSCFG: 0006

  HWERRCAUSE: 0x0

  EXCAUSE   : 0x0

  physical IVG6 asserted : <0xffa00df4> { _evt_timer + 0x0 }

  physical IVG7 asserted : <0xffa00e0c> { _evt_evt7 + 0x0 }

  physical IVG8 asserted : <0xffa00e18> { _evt_evt8 + 0x0 }

  physical IVG9 asserted : <0xffa00e24> { _evt_evt9 + 0x0 }

  physical IVG10 asserted : <0xffa00e30> { _evt_evt10 + 0x0 }

  physical IVG11 asserted : <0xffa00e3c> { _evt_evt11 + 0x0 }

  physical IVG12 asserted : <0xffa00e48> { _evt_evt12 + 0x0 }

  physical IVG13 asserted : <0xffa00e54> { _evt_evt13 + 0x0 }

  physical IVG14 asserted : <0xffa00ae8> { _evt14_softirq + 0x0 }

  physical IVG15 asserted : <0xffa00e60> { _evt_system_call + 0x0 }

  logical irq   6 mapped  : <0xffa00250> { _timer_interrupt + 0x0 }

  logical irq  18 mapped  : <0x00095bf4> { _bfin_serial_rx_int + 0x0 }

  logical irq  19 mapped  : <0x00095e10> { _bfin_serial_tx_int + 0x0 }

  logical irq  24 mapped  : <0x0009eb90> { _bf537mac_interrupt + 0x0 }

RETE: <0x00000000> { _run_init_process + 0xfffff000 }

RETN: <0x008ae000> /* unknown address */

RETX: <0x001710a0> { _bfin_init_mmr_debugfs + 0x4f8 }

RETS: <0xffa00216> { _cpu_idle + 0x12 }

PC  : <0xffa00244> { _default_idle + 0x28 }

 

PROCESSOR STATE:

R0 : 00000000    R1 : 0000ffff    R2 : 00000008    R3 : 00000065

R4 : 00000000    R5 : 00000000    R6 : 00000000    R7 : 00148884

P0 : ffa00a08    P1 : 00168000    P2 : 00168000    P3 : 00148890

P4 : 001819fc    P5 : 00156f08    FP : 00158674    SP : 00169ee0

LB0: ffa018f8    LT0: ffa018f6    LC0: 00000000

LB1: 00170aa3    LT1: 00170aa2    LC1: 00000000

B0 : 00000000    L0 : 00000000    M0 : 00000000    I0 : 20c58d00

B1 : 00000000    L1 : 00000000    M1 : 00000000    I1 : 00000000

B2 : 00000000    L2 : 00000000    M2 : 00000000    I2 : 00000000

B3 : 00000000    L3 : 00000000    M3 : 00000000    I3 : 00000000

A0.w: 000fffff   A0.x: 00000000   A1.w: 00000290   A1.x: 00000000

USP : 0016a000  ASTAT: 02002020

 

NULL pointer access (probably)

Kernel OOPS in progress

Deferred Exception context

 

Double Fault

Kernel OOPS in progress

Deferred Exception context

 

No Valid process in current context

return address: [0x00003d2a]; contents of:

0x00003d00:  0c00  1070  482f  1c55  61f9  a0a8  5408  0808

0x00003d10:  1877  e140  0012  e100  2c18  e300  5e59  3046

0x00003d20:  c682  0f98  4f6f  320f  914a [e410] 0030  0c00

0x00003d30:  1850  0000  0000  e410  0027  0c00  184a  e140

 

SEQUENCER STATUS:               Not tainted

SEQSTAT: 00062027  IPEND: ffa008fe  SYSCFG: 0006

  HWERRCAUSE: 0x18

  EXCAUSE   : 0x27

  physical IVG6 asserted : <0xffa00df4> { _evt_timer + 0x0 }

  physical IVG7 asserted : <0xffa00e0c> { _evt_evt7 + 0x0 }

  physical IVG11 asserted : <0xffa00e3c> { _evt_evt11 + 0x0 }

  logical irq   6 mapped  : <0xffa00250> { _timer_interrupt + 0x0 }

  logical irq  18 mapped  : <0x00095bf4> { _bfin_serial_rx_int + 0x0 }

  logical irq  19 mapped  : <0x00095e10> { _bfin_serial_tx_int + 0x0 }

  logical irq  24 mapped  : <0x0009eb90> { _bf537mac_interrupt + 0x0 }

RETE: <0x00000000> { _run_init_process + 0xfffff000 }

RETN: <0x03366568> [ klogd + 0x66568 ]

RETX: <0x00003d2a> { _dump_bfin_process + 0x46 }

RETS: <0x00003d1e> { _dump_bfin_process + 0x3a }

PC  : <0xffa008fe> { _system_call + 0x22 }

DCPLB_FAULT_ADDR: <0x000000c0> /* Maybe null pointer? */

ICPLB_FAULT_ADDR: <0x00003d2a> { _dump_bfin_process + 0x46 }

 

PROCESSOR STATE:

R0 : 03366568    R1 : 00000001    R2 : 0000001f    R3 : 0000001f

R4 : 03319bc4    R5 : 0000100d    R6 : 00000003    R7 : 03366000

P0 : 0000000a    P1 : 03366000    P2 : 00000000    P3 : 03366d64

P4 : ffe02014    P5 : 03366640    FP : 03366804    SP : 0336648c

LB0: 0330c7ee    LT0: 0330c7ee    LC0: 00000000

LB1: 0330b7ed    LT1: 0330b7ec    LC1: 00000000

B0 : 00000000    L0 : 00000000    M0 : 00000000    I0 : 03366e74

B1 : 00000000    L1 : 00000000    M1 : 00000000    I1 : 0335c04c

B2 : 00000000    L2 : 00000000    M2 : 00000000    I2 : 00000000

B3 : 00000000    L3 : 00000000    M3 : 00000000    I3 : 00000000

A0.w: 00000000   A0.x: 00000000   A1.w: 00000000   A1.x: 00000000

USP : 03366eb4  ASTAT: 02003004

 

Kernel panic - not syncing: Double Fault - unrecoverable event                                                                                                                    

 

Follow-ups

 

--- Robin Getz                                               2008-03-13 15:37:20

I see this on the branch as well as trunk, and I think I broke it - so I will

fix it.

 

-Robin

 

--- Robin Getz                                               2008-03-17 17:57:11

This should be fixed on the trunk and 2008R1 branch.

 

Mike - can you test out?

 

-Robin

 

--- Mike Frysinger                                           2008-03-17 19:20:43

works for me

 

 

 

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