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Re: open_issues/bash_busy-loop.mdwn


From: olafBuddenhagen
Subject: Re: open_issues/bash_busy-loop.mdwn
Date: Wed, 18 Aug 2010 14:38:34 +0200
User-agent: Mutt/1.5.20 (2009-06-14)

Hi,

On Mon, Aug 16, 2010 at 03:45:55PM +0200, address@hidden wrote:

> I'll check whether a NOP loop also causes a hang. And whether it
> happens with another shell.

Yes for both. I generated a backtrace from the hang with dash:

   #0  0x0104ef1c in swtch_pri () at 
/usr/src/eglibc-2.11.2/build-tree/hurd-i386-libc/mach/swtch_pri.S:2
   #1  0x010507b4 in __spin_lock_solid (lock=0x11c18c0) at spin-solid.c:27
   #2  0x010509ad in __mutex_lock_solid (lock=0x11c18c0) at mutex-solid.c:31
   #3  0x010d1c1b in __mutex_lock (oldmem=0x805f560, bytes=92) at 
../mach/lock-intern.h:89
   #4  __libc_realloc (oldmem=0x805f560, bytes=92) at malloc.c:3814
   #5  0x010c1e72 in _IO_vasprintf (result_ptr=0x1024a74, format=0x11ac528 
"%s%s%s:%u: %s%sUnexpected error: %s.\n", args=0x1024650 "") at vasprintf.c:86
   #6  0x010aacab in ___asprintf (string_ptr=0x1024a74, format=0x11ac528 
"%s%s%s:%u: %s%sUnexpected error: %s.\n") at asprintf.c:37
   #7  0x01086f98 in __assert_perror_fail (errnum=19, file=0x11a8718 
"../sysdeps/mach/hurd/fork.c", line=466, function=0x11a874f "__fork") at 
assert-perr.c:62
   #8  0x010fc510 in __fork () at ../sysdeps/mach/hurd/fork.c:466
   #9  0x08050994 in ?? ()
   #10 0x0804c359 in ?? ()
   #11 0x0804b409 in ?? ()
   #12 0x0804b6fc in ?? ()
   #13 0x0804b409 in ?? ()
   #14 0x08051c6c in ?? ()
   #15 0x08051ea6 in ?? ()
   #16 0x0107a81b in __libc_start_main (main=0x8051de0, argc=1, 
ubp_av=0x1024e44, init=0x80598c0, fini=0x80598b0, rtld_fini=0xef40 <_dl_fini>, 
stack_end=0x1024e3c) at libc-start.c:257
   #17 0x080499a1 in ?? ()

No debugging symbols available for dash; but I hope they are not needed
really... The problem seems to be some kind of deadlock in an error path
within glibc's fork() handling. Any suggestion how to debug this?

-antrik-



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