| commit | 62443eb51da14fee24c103cbb98d533c93da0b3e | |
| author | Matthew Dillon <dillon@apollo.backplane.com> | |
| Tue, 14 Feb 2017 07:21:09 +0000 (13 23:21 -0800) | ||
| committer | Matthew Dillon <dillon@apollo.backplane.com> | |
| Tue, 14 Feb 2017 07:21:09 +0000 (13 23:21 -0800) | ||
| tree | 4153587b55af09f4c123c24d6c8b1a64bbf5ee4c | treesnapshot (tar.gz zip) |
| parent | 54ba75e6bbc563cf3be1a4d7b45dc967995a8857 | commitdiff |
kernel - Fix bug in pmap_unwire()
* Fix a bug introduced in the recent pmap work. For kernel pages,
pmap_unwire() was not testing the V bit and would return a bogus
vm_page_t for PTE values of 0, instead of returning NULL.
* Triggered by the mpipe code, used primarily by the crypto subsystem.
Also used for IP fragment reassembly and by tcp_maketemplate(). A
failed M_NOWAIT slab allocation tries to delete the partially filled
map_entry_t, encounters 0 PTEs, and gets confused.
Reported-by: Tim Darby, Antonio Huete Jimenez
* Fix a bug introduced in the recent pmap work. For kernel pages,
pmap_unwire() was not testing the V bit and would return a bogus
vm_page_t for PTE values of 0, instead of returning NULL.
* Triggered by the mpipe code, used primarily by the crypto subsystem.
Also used for IP fragment reassembly and by tcp_maketemplate(). A
failed M_NOWAIT slab allocation tries to delete the partially filled
map_entry_t, encounters 0 PTEs, and gets confused.
Reported-by: Tim Darby, Antonio Huete Jimenez
| sys/platform/pc64/x86_64/pmap.c | diffblobblamehistory |