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possible hash deadlock with recent changes


From: dsmich
Subject: possible hash deadlock with recent changes
Date: Sat, 7 May 2011 10:58:03 -0400

Recent changes to stable-2.0 seem to cause a deadlock in scwm.  Here is the 
last 10 frames of a backtrace.

-Dale

(gdb) bt
#0  0xb77fa424 in __kernel_vsyscall ()
#1  0xb734cf02 in __lll_lock_wait ()
    at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/lowlevellock.S:142
#2  0xb734839b in _L_lock_728 () from /lib/i686/cmov/libpthread.so.0
#3  0xb73481c1 in __pthread_mutex_lock (mutex=0xb74e60a0)
    at pthread_mutex_lock.c:61
#4  0xb74d4737 in GC_lock () at pthread_support.c:1681
#5  0xb74c8b79 in GC_general_register_disappearing_link (link=0x8882e14, 
    obj=0x886be50) at finalize.c:156
#6  0xb75716eb in set_weak_cdr (data=0xbf9f5b18) at hashtab.c:783
#7  0xb74c74dc in GC_call_with_alloc_lock (fn=0xb75716a0 <set_weak_cdr>, 
    client_data=0xbf9f5b18) at finalize.c:925
#8  0xb7572b30 in scm_hash_fn_set_x (table=0x885f3f0, obj=0x89f2a30, 
    val=0x886be50, hash_fn=0xb7571050 <scm_ihash>, 
    assoc_fn=0xb7539820 <scm_sloppy_assoc>, closure=0x0) at hashtab.c:808
#9  0xb7572be7 in scm_hash_set_x (table=0x885f3f0, key=0x89f2a30, 
    val=0x886be50) at hashtab.c:1108
#10 0x080659c4 in ScmMakeColor (cn=0xbf9f5bf1 "rgb:5f5f/5f5f/5f5f", 
    perror_status=0x0) at color.c:230




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