Messages in this thread | | | Date | Tue, 13 Mar 2007 19:55:34 +0100 | From | Johannes Bauer <> | Subject | x86_64 system lockup from userspace using setitimer() |
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Dear Community,
I think I've encountered a bug with the Linux kernel which results in a complete system lockup and which can be started without root priviliges. It's reproducible with 2.6.20.1 and 2.6.20.2 and only x64_64 seems affected.
Here's the code which triggers the bug (originally found by me using an only partly initialized "struct itimerval" structure - hence the strange values in it_interval):
-----8<-----8<-----8<-----8<-----8<-----8<-----8<-----8<-----8<----- #include <stdio.h> #include <sys/time.h> #include <unistd.h>
int main(int argc, char **argv) { struct itimerval tim = { .it_interval = { .tv_sec = 140735669863712, .tv_usec = 4199521 }, .it_value = { .tv_sec = 0, .tv_usec = 100000 } }; setitimer(ITIMER_REAL, &tim, NULL); while (1) sleep(1); return 0; } -----8<-----8<-----8<-----8<-----8<-----8<-----8<-----8<-----8<-----
Compiled with gcc 4.1.1 with "gcc -O2 -Wall -o crash crash.c".
The sourcecode can be found at http://www.johannes-bauer.com/crash/crash.c and my kernel configuration is at http://www.johannes-bauer.com/crash/config
Any further questions: feel free to ask. Please CC me for any posts in this thread.
Greetings, Johannes
-- "A PC without Windows is like a chocolate cake without mustard."
Johannes Bauer 91054 Erlangen - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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