Crash when recording clock_gettime
robert at ocallahan.org
Mon Aug 28 12:03:12 UTC 2017
On Mon, Aug 28, 2017 at 11:29 PM, Benjamin King <benjaminking at web.de> wrote:
> using rr from git (c774fc19) to record the following program.
> #include <time.h>
> #include <sys/time.h>
> int main()
> struct timeval tv;
> gettimeofday( &tv, NULL ); // <-- ok
> struct timespec ts;
> clock_gettime( CLOCK_REALTIME, &ts ); // <-- Crashes in libc
> The call to clock_gettime crashes in libc, but only when recording *and*
> linking libc dynamically.
> Running without rr or linking libc statically avoids the crash.
Works for me here...
> GDB says the crash occurs on a RIP-relative mov with a largish offset
> within libc:
> 0x7ff76285ff00 <clock_gettime> mov 0x2b3f11(%rip),%rax
> # 0x7ff762b13e18
> My libc is custom built with frame pointers but without further
Can you try it with system libc?
I have not seen this with an earlier release of rr yet. Any ideas?
If it works in rr 4.5.0 you could bisect to find the regression.
Try recording with -n to see if this is related to syscall buffering.
Nothing else springs to mind immediately.
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