[FTRACE] 2.6.30-rc6-git5 : Badness at kernel/trace/ftrace.c:444

[Sachin Sant]

While booting 2.6.30-rc6-git5 kernel came across this badness message.

ftrace: allocating 18134 entries in 107 pages
------------[ cut here ]------------
Badness at kernel/trace/ftrace.c:444
NIP: c00000000011e754 LR: c0000000001210fc CTR: 0000000000000000
REGS: c000000000edba40 TRAP: 0700   Not tainted  (2.6.30-rc6-git5)
MSR: 8000000000021032 <ME,CE,IR,DR>  CR: 28000082  XER: 00000000
TASK = c000000000e2d650[0] 'swapper' THREAD: c000000000ed8000 CPU: 0
GPR00: 0000000000000001 c000000000edbcc0 c000000000ed8830 ffffffffffffffea 
GPR04: c000000000500000 0000000000000004 0000000000000000 0000000000000080 
GPR08: 0000000000000000 c000000000fe6c80 f0000000013bc5c0 001bd7a20f0eb79e 
GPR12: 0000000048000088 c000000000f1f380 0000000000382400 0000000000000000 
GPR16: 0000000001100000 0000000001550a00 0000000001550898 0000000008000000 
GPR20: 00000000031cae90 c0000000008f3d88 0000000000000000 c000000000500000 
GPR24: 0000000000000000 0000000000000000 0000000004a47270 0000000000000001 
GPR28: c000000000fe6c80 c000000000500000 c000000000e670f0 c000000000edbcc0 
NIP [c00000000011e754] .ftrace_bug+0x98/0x218
LR [c0000000001210fc] .ftrace_convert_nops+0x20c/0x308
Call Trace:
[c000000000edbcc0] [600000000012bf5c] 0x600000000012bf5c (unreliable)
[c000000000edbd60] [c0000000001210fc] .ftrace_convert_nops+0x20c/0x308
[c000000000edbe30] [c000000000929b8c] .ftrace_init+0x158/0x17c
[c000000000edbee0] [c0000000008fdca4] .start_kernel+0x47c/0x4a8
[c000000000edbf90] [c000000000008408] .start_here_common+0x2c/0xa4
Instruction dump:
41be0010 e93e8010 38000001 90090018 e93e8000 e81e8008 e87e80b0 48000138
8009001c 7c000034 5400d97e 78000020 <0b000000> 2fa00000 41be0010 e93e8010
ftrace failed to modify [<c000000000500000>] .uhci_activate_qh+0x34/0x220
 actual: 00:00:10:10
irq: irq 2 on host null mapped to virtual irq 16


Observed similar problem with git4 as well. This doesn't seem to be a 
widespread problem
and currently observing this on one out of 3 power6 machines.

Complete dmesg and .config(gzipped) attached.

Thanks
-Sachin

-- 

---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
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