Hi to all. I was tracing a bug in the snd_usb_audio driver
(PlayStation 3, Kernel 2.6.29-rc2,
git://git.kernel.org/pub/scm/linux/kernel/git/geoff/ps3-linux.git) and
for that I tried to use the "dynamic ftrace" to get less debug output.
But it did not work at all. Ftrace (without the "dynamic ftrace"
support) works normally. So I traced the "dynamic ftrace" bug and I
think that I found the bug location but I got stucked. Could anyone
help, please? Below is the link with the debug output:
PS1: The problem seems to happen in the file
"./git/linux-2.6/arch/powerpc/kernel/ftrace.c" around the line 217:
"if (ptr != GET_ADDR(addr)) {". It returns true.
PS2: I enabled the "DEBUGP" macro to get the debug output below and
changed the line 218 to "printk(KERN_ERR "addr does not match \nptr:
%lx \naddr: %lx \nGET_ADDR(addr): %lx \n", ptr, addr,
GET_ADDR(addr));".
//*************************************************************************************************************************************
ip:d000000000045aec jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d0000000000458d0 jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d000000000045838 jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d0000000000456dc jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d000000000045624 jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d0000000000453b4 jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d00000000004527c jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d000000000045204 jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d00000000004519c jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d000000000044844 jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d000000000044770 jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d00000000004465c jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d00000000004444c jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d000000000044390 jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d00000000004427c jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d0000000000441f8 jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d00000000004418c jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d000000000044118 jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d00000000004402c jumps to d000000000046340 r2: d000000000050c00
3d82ffff 398c5740 ffff5740 toc: d000000000046360 c0000000 00007cac
ip:d00000000008cce0 jumps to d00000000008d8b0 r2: d000000000097cc0
3d82ffff 398c5bf0 ffff5bf0 toc: d00000000008d8d0 c0000000 00007cac
ip:d00000000008cb90 jumps to d00000000008d8b0 r2: d000000000097cc0
3d82ffff 398c5bf0 ffff5bf0 toc: d00000000008d8d0 c0000000 00007cac
ip:d00000000008ca10 jumps to d00000000008d8b0 r2: d000000000097cc0
3d82ffff 398c5bf0 ffff5bf0 toc: d00000000008d8d0 c0000000 00007cac
ip:d00000000008c924 jumps to d00000000008d8b0 r2: d000000000097cc0
3d82ffff 398c5bf0 ffff5bf0 toc: d00000000008d8d0 c0000000 00007cac
ip:d00000000008c808 jumps to d00000000008d8b0 r2: d000000000097cc0
3d82ffff 398c5bf0 ffff5bf0 toc: d00000000008d8d0 c0000000 00007cac
ip:d00000000008c57c jumps to d00000000008d8b0 r2: d000000000097cc0
3d82ffff 398c5bf0 ffff5bf0 toc: d00000000008d8d0 c0000000 00007cac
ip:d00000000008c4ac jumps to d00000000008d8b0 r2: d000000000097cc0
3d82ffff 398c5bf0 ffff5bf0 toc: d00000000008d8d0 c0000000 00007cac
ip:d00000000008c328 jumps to d00000000008d8b0 r2: d000000000097cc0
3d82ffff 398c5bf0 ffff5bf0 toc: d00000000008d8d0 c0000000 00007cac
ip:d00000000008c260 jumps to d00000000008d8b0 r2: d000000000097cc0
3d82ffff 398c5bf0 ffff5bf0 toc: d00000000008d8d0 c0000000 00007cac
ip:d00000000008c0d4 jumps to d00000000008d8b0 r2: d000000000097cc0
3d82ffff 398c5bf0 ffff5bf0 toc: d00000000008d8d0 c0000000 00007cac
ip:d00000000008c02c jumps to d00000000008d8b0 r2: d000000000097cc0
3d82ffff 398c5bf0 ffff5bf0 toc: d00000000008d8d0 c0000000 00007cac
ps3_system_bus_match:362: dev=10.2(ioc0_03), drv=10.2(ps3vram): match
ps3_system_bus_match:362: dev=10.2(ioc0_03), drv=10.2(ps3vram): match
ps3vram ioc0_03: created ram cache: 7 entries, 256 KiB each
mtd: Giving out device 0 to ps3vram
ps3vram ioc0_03: reserved 245 MiB of gpu memory
ip:d0000000000cd944 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cd840 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cd550 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cd4a8 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cd414 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cd2a8 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cd0d4 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cd018 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000ccf54 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cce0c jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000ccc8c jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000ccbac jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000ccaf8 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cca10 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cc998 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cc940 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cc828 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cc7b8 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cc5bc jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cc408 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cc2dc jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cc268 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cc208 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cc1b4 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cc170 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cc0b4 jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ip:d0000000000cc01c jumps to d0000000000cdff8 r2: d0000000000d8e20
3d82ffff 398c51d8 ffff51d8 toc: d0000000000ce018 c0000000 00007cac
ps3_system_bus_match:362: dev=11.0(lpm_01), drv=11.0(ps3-lpm): match
ps3_system_bus_match:362: dev=11.0(lpm_01), drv=11.0(ps3-lpm): match
ps3-lpm lpm_01: <- ps3_lpm_probe:1245:
ip:d0000000003fe280 jumps to d0000000003ffad8 r2: d000000000422c70
3d82fffe 398cce68 fffece68 toc: d00000000040faf8 6c656400 5f5f6b73
addr does not match
ptr: 6c6564005f5f6b73
addr: c0000000004ff128
GET_ADDR(addr): c000000000007cac
------------[ cut here ]------------
Badness at /home/remis/git/linux-2.6/kernel/trace/ftrace.c:441
NIP: c0000000000b1cb8 LR: c0000000000b335c CTR: 0000000000000000
REGS: c00000000d82b780 TRAP: 0700 Not tainted
(2.6.29-rc2-00839-g22530b0-dirty)
MSR: 8000000000020032 <CE,IR,DR> CR: 24002482 XER: 00000000
TASK = c00000000d7be440[1237] 'modprobe' THREAD: c00000000d828000 CPU: 0
GPR00: 0000000000000001 c00000000d82ba00 c00000000054bf18 ffffffffffffffea
GPR04: d0000000003fe280 c00000000006076c 0000000000000000 0000000000000002
GPR08: 0000000000000000 c000000000b94df0 c000000002a92c20 c00000000d7be440
GPR12: 0000000024002484 c00000000057d300 d000000000417a50 c00000000d82bc78
GPR16: d000000000285fe8 0000000000000549 d00000000028560c d000000000417a18
GPR20: d000000000416ee8 d000000000417a00 000000032945b5f0 0000000000000001
GPR24: c0000000004ff128 c00000000d552560 c0000000004b0270 d0000000003fe280
GPR28: d0000000003fe280 c00000000d552588 c0000000004f8948 c00000000d82ba00
NIP [c0000000000b1cb8] .ftrace_bug+0x98/0x210
LR [c0000000000b335c] .ftrace_convert_nops+0x23c/0x344
Call Trace:
[c00000000d82ba00] [c0000000004ff128] _mcount+0x0/0x18 (unreliable)
[c00000000d82baa0] [c0000000000b335c] .ftrace_convert_nops+0x23c/0x344
[c00000000d82bb70] [c0000000000b349c] .ftrace_init_module+0x38/0x50
[c00000000d82bbf0] [c0000000000a0870] .load_module+0x12dc/0x1898
[c00000000d82bd80] [c0000000000a0ffc] .SyS_init_module+0x90/0x248
[c00000000d82be30] [c0000000000074dc] syscall_exit+0x0/0x40
Instruction dump:
41be0010 e93e8010 38000001 9009002c e93e8000 e97e8008 e87e80c0 48000130
80090030 7c000034 5400d97e 78000020 <0b000000> 2fa00000 41be0010 e93e8010
ftrace failed to modify [<d0000000003fe280>] 0xd0000000003fe280
actual: 48:00:18:59
//*************************************************************************************************************************************
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