|To:||Anirban Sinha <ASinha@zeugmasystems.com>|
|Subject:||Re: BUG: BUS error while returning from read() in /dev/oprofile/buffer|
|From:||David Daney <firstname.lastname@example.org>|
|Date:||Thu, 03 Jan 2008 17:27:44 -0800|
|Cc:||email@example.com, Ralf Baechle <firstname.lastname@example.org>|
|User-agent:||Thunderbird 18.104.22.168 (X11/20071019)|
Anirban Sinha wrote:
Hi:I have been trying to hunt down this bug for several days now. What mainly happens is that when oprofiled wakes up from read() in /dev/oprofile/buffer on receiving a signal USR1 (i.e, when someone does opcontrol –start after doing opcontrol—start-daemon), it somehow gets SIGBUS within glibc read(). We are using a mips machine with Sybyte SB1 processor. On intel, this error does not show up. Interestingly, when I tried running a small test program that simply reads /dev/oprofile/buffer, the error can’t be reproduced!Ralf and others, any insights, suggestions or useful comments from experience will be really really appreciated. I am spending a lot of time trying to fix this bug.
Likely you did a cross build of bash and your signal numbers are incorrect. On the system where you built bash, SIGUSR1 is 10.On the mips-linux target signal 10 is SIGBUS so when the bash kill builtin thinks it is sending SIGUSR1 it is really sending SIGBUS.
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