rcache/vma: do not release vma stuctures in vma_tree_delete #2719
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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. Backported from 79cabc9 Fixes open-mpi#1654 Signed-off-by: Nathan Hjelm <hjelmn@lanl.gov>
jsquyres
reviewed
Jan 12, 2017
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| while (NULL != (item = opal_list_remove_first (&rcache->vma_gc_list))) { | ||
| OBJ_RELEASE(item); | ||
| } |
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Any reason not to use OPAL_LIST_DESTRUCT here?
Or is it just to-MAY-to vs. to-MAH-to?
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Would then need to OBJ_CONSTRUCT again. So its MAY to MAH.
jsquyres
approved these changes
Jan 12, 2017
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@Di0gen @jladd-mlnx The reliability of the Mellanox jenkins has been quite low recently -- a lot of triggered builds that never start (like the current status of this PR):
Can something be fixed? Thanks! |
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seems bug in jenkins, we are checking offline |
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@hppritcha Good to go. |
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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.
Backported from 79cabc9
Fixes #1654
Signed-off-by: Nathan Hjelm hjelmn@lanl.gov