rcache/base: do not release vma stuctures in vma_tree_delete #2703
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This commit fixes a deadlock that can occur when the libc version holds a lock when calling munmap. In this case we could end up calling free() from vma_tree_delete which would in turn try to obtain the lock in libc. To avoid the issue put any deleted vma's in a new list on the vma module and release them on the next call to vma_tree_insert. This should be safe as this function is not called from the memory hooks. Signed-off-by: Nathan Hjelm <hjelmn@lanl.gov>
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tentatively giving a 2.0.2 milestone. |
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@bosilca I am going to go ahead and merge this. Please test the v2.0.x PR. |
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I got a short allocation on the machine (a dozen runs) and I was not able to replicate. The original issue was only seldom triggered, so there is a chance I just got lucky this time. |
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This commit fixes a deadlock that can occur when the libc version
holds a lock when calling munmap. In this case we could end up calling
free() from vma_tree_delete which would in turn try to obtain the lock
in libc. To avoid the issue put any deleted vma's in a new list on the
vma module and release them on the next call to vma_tree_insert. This
should be safe as this function is not called from the memory hooks.
Signed-off-by: Nathan Hjelm hjelmn@lanl.gov