https://sourceware.org/bugzilla/show_bug.cgi?id=28190
Mark Wielaard <mark at klomp dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Last reconfirmed| |2021-08-04
Status|UNCONFIRMED |ASSIGNED
--- Comment #2 from Mark Wielaard <mark at klomp dot org> ---
This comes from the following glibc commit:
commit f779b1efb35fe141e47952af3ac7f0540acca401
Author: Adhemerval Zanella <[email protected]>
Date: Mon Dec 7 16:21:55 2020 -0300
nptl: Implement raise in terms of pthread_kill
Now that pthread_kill is provided by libc.so it is possible to
implement the generic POSIX implementation as
'pthread_kill(pthread_self(), sig)'.
For Linux implementation, pthread_kill read the targeting TID from
the TCB. For raise, this it not possible because it would make raise
fail when issue after vfork (where creates the resulting process
has a different TID from the parent, but its TCB is not updated as
for pthread_create). To make raise use pthread_kill, it is make
usable from vfork by getting the target thread id through gettid
syscall.
Checked on x86_64-linux-gnu and aarch64-linux-gnu.
Before raise simply called the (tg)kill syscall directly. Now we have an extra
frame in the backtrace.
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