QNX hang

We have used QNX for the last few years, and we never had this problem until
we apply the latest patch (qnx5505.ebf.F) for Sybase on March 1st. Since
then we experienced hang on our system for four times with the following
output shown on the screen:

Version: 425.L Feb 15 2001
“Proc fault 1,ldt 100/boot/sys/Proc32; fault e+0”
cs:eip=5:89c1 ss:esp=d:f7c0f50 efl=12097 ds=d es=d fs=0 gs=0
eax/44b2 ebx/3c8999c6 ecx/5a4832 edx/1 esi/0 edi/1 ebp/f7c0f5c

Stack (d:f7c0f50)
1a1da73a 005a4832 00000201 0f7c0fa0 00003820 00015fcc 00008a48 00003820
00015fcc 00008000 1a1da73a 00008c04 0005fcd0 00000000 00000000 00000000
3c8999c6 00000001 00000001 00000001 0f7c0fb8 00000000 0000597d 0005fcd0
00008fd5 0000005a 0F7c0fe8 0000597d 0000000b 00003822 0f7c0fd0 000057aa

Process entry (addr 5aa4)
00000000 00000001 00000000 00000001 00000000 00000000 30020207 00001e1e
00005858 0100000d 00005b5c ffffffff 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000501 000d0005 00009458 00000000 00000001
00000022 00000000 00001518 0001c5c0 00000000 00000000 0002c310 00000000
00000000 00000000 00000000 ffff0001 00000000 00000000

We are not sure if the patch has actually caused this problem or not. Has
anyone experienced the same problem here?