gnu/77818: GDB locks in wait4() when running applications

[Seán C. Farley]

On Tue, 19 Apr 2005, David Xu wrote:

> I have commited a fix to -CURRENT, don't know if it will fix the
> problem you have seen, but it is worth to try.
>
> David Xu
>
> Seán C. Farley wrote:
>
>> I finally compiled Zsh with debugging and got the following trace.  I
>> ran it by the following line:
>> LD_LIBRARY_PATH=/tmp/libc SHELL=/bin/sh gdb /usr/local/bin/zsh
>> 
>> Program received signal SIGINT, Interrupt.
>> 0x281a9efb in sigsuspend () from /lib/libc.so.5
>> (gdb) where
>> #0  0x281a9cfb in sigsuspend () at sigsuspend.S:2
>> #1  0x280e07dc in signal_suspend (sig=20, sig2=2) at signals.c:367
>> #2  0x280b92e8 in waitforpid (pid=11195) at jobs.c:1120
>> #3  0x280a3dda in getoutput (cmd=0x8060e5c "uname -s", qt=1) at exec.c:2869
>> #4  0x280e2a0c in stringsubst (list=0xbfbfe7c0, node=0xbfbfe7d0, ssub=4,
>>     asssub=0) at subst.c:189
>> #5  0x280e2378 in prefork (list=0xbfbfe7c0, flags=6) at subst.c:74
>> #6  0x280a0886 in addvars (state=0xbfbfe880, pc=0xbfbfe7c0, export=0)
>>     at exec.c:1614
>> #7  0x2809ec5d in execsimple (state=0x1) at exec.c:802
>> #8  0x2809edb7 in execlist (state=0xbfbfe880, dont_change_job=0, exiting=0)
>>     at exec.c:855
>> #9  0x2809eb9a in execode (p=0x80608e0, dont_change_job=0, exiting=0)
>>     at exec.c:775
>> #10 0x280b3a8a in loop (toplevel=0, justonce=0) at init.c:165
>> #11 0x280b58b8 in source (s=0xbfbfe950 "/root/.zshenv") at init.c:1043
>> #12 0x280b5b1c in sourcehome (s=0x280f458d ".zshenv") at init.c:1088
>> #13 0x280b54e7 in run_init_scripts () at init.c:937
>> #14 0x280b63da in zsh_main (argc=1, argv=0xbfbfeac0) at init.c:1262
>> #15 0x08048583 in main (argc=1, argv=0xbfbfeac0) at ./main.c:93
>> 
>> I hope this can help find the problem.

Would you happen to have a patch to -STABLE for the fix?  I looked at
some of the code you committed recently and was unsure of what fix(es)
needed to be made to test it.  A few of the changes did not look like
they matched easily to -STABLE.

Thank you.

Seán
-- 
sean-freebsd at farley.org