Comment 1 for bug 333624

I submitted this as a bug against mozilla (https://bugzilla.mozilla.org/show_bug.cgi?id=474155) but there has been no feedback there, This occurs in the firefox 3.1 builds

malloc_init calls malloc_ncpus which in turn calls malloc_init trapping itself
in malloc_mutex_lock. I see this on a Ubuntu 8.04 server but not on a Ubuntu
8.10 laptop, but there may be other differences. The traceback that follows shows that on 8.04 that calloc calls malloc_init which acquires a futex, and tries to "open" /proc/cpuinfo to see how many cpus there are. However, open calls malloc and gets caught in the futex.

This is the mozilla jemalloc malloc replacement, but I don't know why this occurs on the 8.04 server box and not the 8.10 laptop.

 Here is a traceback:

#0 malloc_init_hard ()
    at /var/dept/scratch/km/src/mozilla/memory/jemalloc/jemalloc.c:5383
#1 0x08056c22 in malloc_init ()
    at /var/dept/scratch/km/src/mozilla/memory/jemalloc/jemalloc.c:5362
#2 0x08057411 in calloc (num=1, size=20)
    at /var/dept/scratch/km/src/mozilla/memory/jemalloc/jemalloc.c:6098
#3 0xb7c3332c in ?? () from /lib/tls/i686/cmov/libdl.so.2
#4 0xb7c32d73 in dlsym () from /lib/tls/i686/cmov/libdl.so.2
#5 0xb7efe97a in open (path=0x805800f "/proc/cpuinfo", oflag=0, mode=0)
    at libc_ut.c:97
#6 0x08054388 in malloc_ncpus ()
    at /var/dept/scratch/km/src/mozilla/memory/jemalloc/jemalloc.c:5111
#7 0x08055edf in malloc_init_hard ()
    at /var/dept/scratch/km/src/mozilla/memory/jemalloc/jemalloc.c:5415
#8 0x08056c22 in malloc_init ()
    at /var/dept/scratch/km/src/mozilla/memory/jemalloc/jemalloc.c:5362
#9 0x08057411 in calloc (num=1, size=20)
    at /var/dept/scratch/km/src/mozilla/memory/jemalloc/jemalloc.c:6098
#10 0xb7c3332c in ?? () from /lib/tls/i686/cmov/libdl.so.2
#11 0xb7c32b51 in dlopen () from /lib/tls/i686/cmov/libdl.so.2
#12 0xb7c4b443 in pr_FindSymbolInProg (name=0x0)
    at /var/dept/scratch/km/src/mozilla/nsprpub/pr/src/malloc/prmem.c:130
#13 0xb7c4b52f in _PR_InitZones ()
---Type <return> to continue, or q <return> to quit---
    at /var/dept/scratch/km/src/mozilla/nsprpub/pr/src/malloc/prmem.c:186
#14 0xb7c510c1 in _PR_InitStuff ()
    at /var/dept/scratch/km/src/mozilla/nsprpub/pr/src/misc/prinit.c:172
#15 0xb7c62568 in PR_GetCurrentThread ()
    at /var/dept/scratch/km/src/mozilla/nsprpub/pr/src/pthreads/ptthread.c:646
#16 0xb7ca134b in nsAutoOwningThread (this=0xb7d44974)
    at ../../../../dist/include/xpcom/nsISupportsImpl.h:70
#17 0xb7d0d70f in __static_initialization_and_destruction_0 (
    __initialize_p=<value optimized out>, __priority=0)
    at /var/dept/scratch/km/src/mozilla/xpcom/base/nsTraceRefcntImpl.cpp:1287
#18 0xb7d2b685 in __do_global_ctors_aux ()
   from ./objdir-ff/dist/bin/libxpcom_core.so
#19 0xb7c9c7b0 in _init () from ./objdir-ff/dist/bin/libxpcom_core.so
#20 0xb7f11990 in ?? () from /lib/ld-linux.so.2
#21 0xb7f11ac3 in ?? () from /lib/ld-linux.so.2
#22 0xb7f0484f in ?? () from /lib/ld-linux.so.2