[#5277] kgdb self tests fail on do_fork when CTRL+C is hit

Submitted By: Mike Frysinger

Open Date

2009-06-18 09:29:51 Close Date

2009-09-16 19:20:08

Priority:

Medium Assignee:

Sonic Zhang

Status:

Closed Fixed In Release:

N/A

Found In Release:

2010R1 Release:

trunk 6784

Category:

N/A Board:

EZKIT Lite

Processor:

BF548 Silicon Revision:

Is this bug repeatable?:

Yes Resolution:

Fixed

Uboot version or rev.:

Toolchain version or rev.:

trunk

App binary format:

N/A

Summary: kgdb self tests fail on do_fork when CTRL+C is hit

Details:

this shouldnt be related to the recent changes i made to kgdb -- i reverted those and still get the same crash

i enabled the default kgdb internal tests:

CONFIG_KGDB_TESTS=y

CONFIG_KGDB_TESTS_ON_BOOT=y

CONFIG_KGDB_TESTS_BOOT_STRING="V1F100"

then booted up and the first stuff worked fine:

...

kgdb: Registered I/O driver kgdbts.

kgdbts:RUN plant and detach test

kgdbts:RUN sw breakpoint test

kgdbts:RUN bad memory access test

kgdbts:RUN singlestep test 1000 iterations

kgdbts:RUN singlestep [0/1000]

kgdbts:RUN singlestep [100/1000]

kgdbts:RUN singlestep [200/1000]

kgdbts:RUN singlestep [300/1000]

kgdbts:RUN singlestep [400/1000]

kgdbts:RUN singlestep [500/1000]

kgdbts:RUN singlestep [600/1000]

kgdbts:RUN singlestep [700/1000]

kgdbts:RUN singlestep [800/1000]

kgdbts:RUN singlestep [900/1000]

kgdbts:RUN hw breakpoint test

kgdbts:RUN do_fork for 100 breakpoints

Freeing unused kernel memory: 2124k freed

...

so then to exercise the do_fork thing, you have to do a bunch of forks. the simple case works fine:

root:/> while :; do ls > /dev/null ; done

kgdb: Unregistered I/O driver kgdbts, debugger disabled.

root:/>

but if the first thing i do at boot is hit CTRL+C, KGDB craps out:

root:/> kgdbts: BP mismatch 27c6e expected ef8c

Double Fault

Kernel OOPS in progress

Deferred Exception context

No Valid process in current context

return address: [0x0007f02a]; contents of:

0x0007f000: e147 0000 e107 ef8c 3037 6416 2f84 e147

0x0007f010: 000c e107 0b00 3037 6416 2f7d e140 000a

0x0007f020: 3017 e100 8f0c e300 083d [efcd] 6008 2fab

0x0007f030: e140 000a a1a9 e100 8e44 e300 0833 2f87

ADSP-BF548-0.2 525(MHz CCLK) 131(MHz SCLK) (mpu off)

Linux version 2.6.30-ADI-2010R1-pre (vapier@vapier-m) (gcc version 4.3.3 (ADI-trunk/git-04ddb73) ) #42 Thu Jun 18 09:10:35 EDT 2009

SEQUENCER STATUS: Not tainted

SEQSTAT: 00060021 IPEND: ffe02108 SYSCFG: 0006

EXCAUSE : 0x21

physical IVG3 asserted : <0xffa0076c> { _trap + 0x0 }

physical IVG8 asserted : <0xffa00e40> { _evt_evt8 + 0x0 }

physical IVG13 asserted : <0xffa00f6c> { _evt_evt13 + 0x0 }

logical irq 6 mapped : <0xffa00370> { _timer_interrupt + 0x0 }

logical irq 48 mapped : <0x00079110> { _bfin_serial_rx_int + 0x0 }

logical irq 49 mapped : <0x00078e94> { _bfin_serial_tx_int + 0x0 }

RETE: <0x(null)> /* Maybe null pointer? */

RETN: <0x000cfb6c> /* kernel dynamic memory */

RETX: <0x0007f02a> { _check_and_rewind_pc + 0x14a }

RETS: <0x0007f02a> { _check_and_rewind_pc + 0x14a }

PC : <0x0007f02a> { _check_and_rewind_pc + 0x14a }

DCPLB_FAULT_ADDR: <0x000cfb68> /* kernel dynamic memory */

ICPLB_FAULT_ADDR: <0x0007f02a> { _check_and_rewind_pc + 0x14a }

PROCESSOR STATE:

R0 : 0000002b R1 : 0000003f R2 : 0000003f R3 : 00000d9a

R4 : 000bbc4d R5 : 0000100d R6 : 0000ef8e R7 : 0000ef8c

P0 : 00000d99 P1 : 000c2d00 P2 : 000c2d58 P3 : 000c0ce0

P4 : 000c02e0 P5 : 000c0c04 FP : 0000000f SP : 000cfa90

LB0: 00068204 LT0: 00068202 LC0: 00000000

LB1: 000675e8 LT1: 000675de LC1: 00000000

B0 : 0000001b L0 : 00000000 M0 : 00000000 I0 : 00000000

B1 : 00000000 L1 : 00000000 M1 : 00000000 I1 : 000856f0

B2 : 00000000 L2 : 00000000 M2 : 00000000 I2 : 00000020

B3 : 00000000 L3 : 00000000 M3 : 00000000 I3 : 0000000f

A0.w: 00000011 A0.x: 00000000 A1.w: 00000011 A1.x: 00000000

USP : 000d0000 ASTAT: 02003025

Hardware Trace:

0 Target : <0x00004ef8> { _trap_c + 0x0 }

Source : <0xffa006fa> { _exception_to_level5 + 0xb2 } CALL pcrel

1 Target : <0xffa00648> { _exception_to_level5 + 0x0 }

Source : <0xffa00518> { _bfin_return_from_exception + 0x18 } RTX

2 Target : <0xffa00500> { _bfin_return_from_exception + 0x0 }

Source : <0xffa0058e> { _ex_trap_c + 0x46 } JUMP.S

3 Target : <0xffa00548> { _ex_trap_c + 0x0 }

Source : <0xffa007c4> { _trap + 0x58 } JUMP (P4)

4 Target : <0xffa0076c> { _trap + 0x0 }

Source : <0x00027c6c> { _kgdb_breakpoint + 0xc } EXCPT 0x2

5 Target : <0x00027c60> { _kgdb_breakpoint + 0x0 }

Source : <0x0007907e> { _bfin_serial_rx_chars + 0x17a } CALL pcrel

6 Target : <0x0007907a> { _bfin_serial_rx_chars + 0x176 }

Source : <0x00078f40> { _bfin_serial_rx_chars + 0x3c } IF !CC JUMP

7 Target : <0x00078f04> { _bfin_serial_rx_chars + 0x0 }

Source : <0x0007911c> { _bfin_serial_rx_int + 0xc } CALL pcrel

8 Target : <0x0007911a> { _bfin_serial_rx_int + 0xa }

Source : <0x00079128> { _bfin_serial_rx_int + 0x18 } IF CC JUMP

9 Target : <0x00079120> { _bfin_serial_rx_int + 0x10 }

Source : <0x00079118> { _bfin_serial_rx_int + 0x8 } JUMP.S

10 Target : <0x00079110> { _bfin_serial_rx_int + 0x0 }

Source : <0x00029b4c> { _handle_IRQ_event + 0x48 } CALL (P2)

11 Target : <0x00029b46> { _handle_IRQ_event + 0x42 }

Source : <0x00029b30> { _handle_IRQ_event + 0x2c } JUMP.S

12 Target : <0x00029b20> { _handle_IRQ_event + 0x1c }

Source : <0x00029b12> { _handle_IRQ_event + 0xe } IF CC JUMP

13 Target : <0x00029b04> { _handle_IRQ_event + 0x0 }

Source : <0x0002b0dc> { _handle_simple_irq + 0x38 } CALL pcrel

14 Target : <0x0002b0a4> { _handle_simple_irq + 0x0 }

Source : <0xffa0035c> { _asm_do_IRQ + 0x74 } CALL (P1)

15 Target : <0xffa00350> { _asm_do_IRQ + 0x68 }

Source : <0x000296c6> { _irq_to_desc + 0x1a } RTS

Kernel panic - not syncing: Double Fault - unrecoverable event

Follow-ups

--- Sonic Zhang 2009-09-07 06:47:29

Fixed. kgdboc should accept gdb break only when it is active.

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[#5277] kgdb self tests fail on do_fork when CTRL+C is hit