Red Hat Bugzilla – Bug 114845
_exit() in IA32 comaptibility lib calls unimplemented syscall
Last modified: 2007-11-30 17:07:00 EST
Description of problem:
The _exit() function in libc(IA32) calls syscall 252 (exit_group)
which is unimplemented in the IA64 emulation. exit() is called anyway,
so this may not have major adverse effects. However, the wrong syscall
generates an ugly syslog message. Moreover, there are many other
unimplemented ia32 syscalls, some of which are called on a regular
basis by ia32 applications.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. compile "Hello World" C Program on i386 (using shared libs)
2. run generated executable on ia64
kernel: IA32 syscall #252 issued, maybe we should implement it
No error message
There are a number of other syscalls that cause similar error
messages, I have seen #258 (set_tid_address) and #270 (tgkill).
I know you want to mark this as a duplicate of BUG 107116.
Before you do so, hgave a look at this code:
INLINE_SYSCALL (exit_group, 1, status);
INLINE_SYSCALL (exit, 1, status);
Looking at this code, it seems that this file includes wrong kernel
headers suggesting that the exit_group() syscall exists.
IMO there'd be an easy way to handle this problem: include correct
kernel headers that do not define NR_exit_group and other NR_ macros
for unimplemented syscalls on ia64/ia32.
exit_group is implemented on i386, therefore it is of course in
i386 headers. Compatibility libraries certainly shouldn't differ
from the real ones, it really either needs to be implemented in the
kernel, or implemented in the emulator.
I fail to see why a compatibility library should invoke unimplemented
system calls. Actually, I consider that pretty dangerous.
To my understanding, what mainly matters is the ABI exposed by the
library to applications, not the kernel interface.