* More bad backtraces through nanosleep
@ 2003-09-07 19:22 Daniel Jacobowitz
2003-09-07 19:23 ` Daniel Jacobowitz
0 siblings, 1 reply; 2+ messages in thread
From: Daniel Jacobowitz @ 2003-09-07 19:22 UTC (permalink / raw)
To: gdb
This is a little unfortunate...
Glibc with NPTL uses DWARF-2 unwind information to describe syscall
wrappers, because the NPTL implementation of cancellation uses dwarf2
unwinding. However, glibc with LinuxThreads does not. So if you're running
a multi-threaded LinuxThreads application, when we hit a syscall we're
likely to get completely lost. We can't reasonably expect GDB's prologue
unwinder to figure out nanosleep; the function has no prologue, and then
pushes things onto the stack inside CENABLE/CDISABLE.
Libc folks, would there be any disadvantages besides space to adding unwind
info to the cancellable syscall wrappers in LT also? How would you feel
about such a patch?
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: More bad backtraces through nanosleep
2003-09-07 19:22 More bad backtraces through nanosleep Daniel Jacobowitz
@ 2003-09-07 19:23 ` Daniel Jacobowitz
0 siblings, 0 replies; 2+ messages in thread
From: Daniel Jacobowitz @ 2003-09-07 19:23 UTC (permalink / raw)
To: gdb, libc-alpha
Er, ah, I meant to send this to libc-alpha also of course.
On Sun, Sep 07, 2003 at 03:22:32PM -0400, Daniel Jacobowitz wrote:
> This is a little unfortunate...
>
> Glibc with NPTL uses DWARF-2 unwind information to describe syscall
> wrappers, because the NPTL implementation of cancellation uses dwarf2
> unwinding. However, glibc with LinuxThreads does not. So if you're running
> a multi-threaded LinuxThreads application, when we hit a syscall we're
> likely to get completely lost. We can't reasonably expect GDB's prologue
> unwinder to figure out nanosleep; the function has no prologue, and then
> pushes things onto the stack inside CENABLE/CDISABLE.
>
> Libc folks, would there be any disadvantages besides space to adding unwind
> info to the cancellable syscall wrappers in LT also? How would you feel
> about such a patch?
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer
^ permalink raw reply [flat|nested] 2+ messages in thread
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