On Tue, 2011-01-11 at 19:02 +0100, Kolja Waschk wrote:
> > Ok. Could you try with current xenomai-2.5 tip? We fixed a few things
> > which might, possibly, with some luck, be the cause of this issue.
>
> I tried, but to me the result looks similar (see below). BTW, I have to
> correct my previous report regarding the I-Pipe version, I actually used
> adeos-ipipe-2.6.34-blackfin-1.15-01.patch. Not 1.14-02.
>
> I'm unsure where I should set a reasonable breakpoint with gdb (attached via
> gdbproxy) so that I could get a better backtrace? I tried to break at traps_c
> but the stackframe at that time probably is of no help anymore.
>
> Here's an example of the Illegal use of supervisor resource (the NULL pointer
> exception didn't happen so far). This happened with 2.5.git. A difference to
> the previous recordings is that the first reported source is _schedule and
> not _xnpod_schedule_deferred, but I observed that sometimes also with 2.5.5.2.
This issue is possibly an Adeos bug, not a Xenomai one, despite the
traces. If that is true, then gdb won't be of no help in the kind of
context I'm thinking of (interrupt related, more precisely in the IRQ
level transition we use internally to run syscalls and epilogues of
realtime IRQs), and there is no straightforward tips on how to track it
unfortunately. Well, your report is queued, thanks. I can't do much
better for now.
>
>
> > Illegal use of supervisor resource
> <5> - Attempted to use a Supervisor register or instruction from User mode.
> <5> Supervisor resources are registers and instructions that are reserved
> <5> for Supervisor use: Supervisor only registers, all MMRs, and Supervisor
> <5> only instructions.
> Deferred Exception context
> CURRENT PROCESS:
> COMM=pfda PID=252 CPU=0
> TEXT = 0x01640000-0x01665c5c DATA = 0x016a0c5c-0x016a9314
> BSS = 0x016a9314-0x01700000 USER-STACK = 0x0175fe40
>
> return address: [0x000063f6]; contents of:
> 0x000063d0: 9151 e14a 001d e10a a424 9110 6fa6 4800
> 0x000063e0: 1409 e14a 001d e10a 45e4 9110 60f9 0808
> 0x000063f0: 1403 0001 2000 [0037] 0c41 1802 0061 304e
> 0x00006400: 4d69 4f69 0032 3211 a090 4c38 b090 6200
>
> ADSP-BF537-0.3 533(MHz CCLK) 133(MHz SCLK) (mpu off)
> Linux version 2.6.34.7-ADI-2010R1-svn10663 (k...@fee) (gcc version 4.3.5
> (ADI-2010R1-RC4) ) #7 Tue Jan 11 18:24:08 CET 2011
>
> SEQUENCER STATUS: Not tainted
> SEQSTAT: 0000002e IPEND: 0008 IMASK: ffff SYSCFG: 0006
> EXCAUSE : 0x2e
> physical IVG3 asserted : <0xffa0076c> { _trap + 0x0 }
> RETE: <0x00000000> /* Maybe null pointer? */
> RETN: <0x00cb1f18> /* kernel dynamic memory */
> RETX: <0x00000480> /* Maybe fixed code section */
> RETS: <0xffa0094e> { _system_call + 0xba }
> PC : <0x000063f6> { ___ipipe_sync_root + 0x32 }
> DCPLB_FAULT_ADDR: <0x001d45e4> /* kernel dynamic memory */
> ICPLB_FAULT_ADDR: <0x000063f6> { ___ipipe_sync_root + 0x32 }
> PROCESSOR STATE:
> R0 : 0000ffff R1 : 0000001f R2 : 00847e86 R3 : 00000000
> R4 : 0000fffe R5 : 00f5a1f4 R6 : 00f08004 R7 : 00000080
> P0 : 001d45e4 P1 : 0003761c P2 : 001d45e4 P3 : 0091cc68
> P4 : 0091cc68 P5 : 00cb0000 FP : 00f5a158 SP : 00cb1e3c
> LB0: 013e04a1 LT0: 013e049e LC0: 00000000
> LB1: 013dcfdf LT1: 013dcfde LC1: 00000000
> B0 : 00000137 L0 : 00000000 M0 : 00000000 I0 : 00000000
> B1 : 000000c0 L1 : 00000000 M1 : 00000000 I1 : 00000001
> B2 : 7ffff000 L2 : 00000000 M2 : 00000000 I2 : 00000000
> B3 : 00000000 L3 : 00000000 M3 : 0000005b I3 : 00000140
> A0.w: 00000000 A0.x: 00000000 A1.w: 00000006 A1.x: 00000000
> USP : 00f5a130 ASTAT: 02003004
>
> Hardware Trace:
> 0 Target : <0x00003bf8> { _trap_c + 0x0 }
> Source : <0xffa00700> { _exception_to_level5 + 0xa4 } JUMP.L
> 1 Target : <0xffa0065c> { _exception_to_level5 + 0x0 }
> Source : <0xffa00510> { _bfin_return_from_exception + 0x18 } RTX
> 2 Target : <0xffa004f8> { _bfin_return_from_exception + 0x0 }
> Source : <0xffa005b4> { _ex_trap_c + 0x74 } JUMP.S
> 3 Target : <0xffa00540> { _ex_trap_c + 0x0 }
> Source : <0xffa007c4> { _trap + 0x58 } JUMP (P4)
> 4 Target : <0xffa0076c> { _trap + 0x0 }
> FAULT : <0x000063f6> { ___ipipe_sync_root + 0x32 } CLI R7
> Source : <0x000063f0> { ___ipipe_sync_root + 0x2c } IF !CC JUMP pcrel
> (BP)
> 5 Target : <0x000063c4> { ___ipipe_sync_root + 0x0 }
> Source : <0xffa0094a> { _system_call + 0xb6 } CALL pcrel
> 6 Target : <0xffa0094a> { _system_call + 0xb6 }
> Source : <0xffa00d12> { __common_int_entry + 0xce } RTI
> 7 Target : <0xffa00cb0> { __common_int_entry + 0x6c }
> Source : <0xffa00982> { _system_call + 0xee } RTS
> 8 Target : <0xffa0097e> { _system_call + 0xea }
> Source : <0xffa0096e> { _system_call + 0xda } IF !CC JUMP pcrel
> 9 Target : <0xffa00964> { _system_call + 0xd0 }
> Source : <0xffa00954> { _system_call + 0xc0 } IF !CC JUMP pcrel
> 10 Target : <0xffa00952> { _system_call + 0xbe }
> Source : <0xffa00942> { _system_call + 0xae } IF !CC JUMP pcrel
> 11 Target : <0xffa00930> { _system_call + 0x9c }
> Source : <0xffa00962> { _system_call + 0xce } JUMP.S
> 12 Target : <0xffa00960> { _system_call + 0xcc }
> Source : <0xffa01da6> { _schedule + 0x2e6 } RTS
> 13 Target : <0xffa01d96> { _schedule + 0x2d6 }
> Source : <0x00032a2e> { ___ipipe_unstall_root + 0x2e } RTS
> 14 Target : <0x00032a1e> { ___ipipe_unstall_root + 0x1e }
> Source : <0x00032a18> { ___ipipe_unstall_root + 0x18 } IF CC JUMP pcrel
> (BP)
> 15 Target : <0x00032a00> { ___ipipe_unstall_root + 0x0 }
> Source : <0xffa01d92> { _schedule + 0x2d2 } JUMP.L
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--
Philippe.
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