Date: Tue, 27 Nov 2001 12:11:42 -0500 (EST) From: Zhihui Zhang <zzhang@cs.binghamton.edu> To: freebsd-hackers@freebsd.org Subject: malloc deadlock with M_NOWAIT Message-ID: <Pine.SOL.4.21.0111271201200.7858-100000@onyx>
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I am trying to allocate a dynamic number of large memory (128K) by
malloc(128K, M_xxx, M_NOWAIT). Although this is not done in an interrupt
routine, I figure I'd better use M_NOWAIT so that I can deal with the
situation when the memory is low. However, I experience the following
deadlock:
#1 0xc02d8f4d in vm_object_page_remove (object=0xc03fa060, start=5690,
end=5722, clean_only=0) at ../../vm/vm_object.c:1459
#2 0xc02d53ce in vm_map_delete (map=0xc03f9ee0, start=3243479040,
end=3243610112) at ../../vm/vm_map.c:1872
#3 0xc02d35e3 in kmem_malloc (map=0xc03f9ee0, size=131072, flags=1)
at ../../vm/vm_kern.c:365
#4 0xc01baed7 in malloc (size=131072, type=0xc0f6ab60, flags=1)
at ../../kern/kern_malloc.c:188
The process that calls mallocs() hangs at the following statement inside
vm_object_page_remove():
vm_page_sleep_busy(p, TRUE, "vmopar")
At the same time, the entire system also freezes. I am wondering if I am
doing the right thing here. Maybe 128K is too large for such a use? I am
using 4.4-Release.
Any suggestion is appreciated.
-Zhihui
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