IABSD.fr/src/sys/uvm

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• Author : kettenis
  Date : 2026-04-13 15:23:57
  Hash : b09aaa95
  Message : The fault handling code that deals with getting back from swap for an anon does not expect failures because we are short on memory. These are synchronous operations so we're expected to wait on memory to become available. This got broken in rev 1.178 (Back out the pagedaemon "oom" reserve and sleeping point). Bring back the code to allocate bounce memory using uvm_pglistalloc(9) but only use it for the !async case (which will never be use by the pagedaemon). This fixes random segfaults when under memory pressure and init dying with SIGILL because it can't copy out a signal frame to the stack when it happens to trigger such a segfault. With deraadt@, who wrote the code to consolidate the allocation of bounce memory. ok deraadt@

• Files
• uvm.h
• uvm_addr.c
• uvm_addr.h
• uvm_amap.c
• uvm_amap.h
• uvm_anon.c
• uvm_anon.h
• uvm_aobj.c
• uvm_aobj.h
• uvm_ddb.h
• uvm_device.c
• uvm_device.h
• uvm_extern.h
• uvm_fault.c
• uvm_fault.h
• uvm_glue.c
• uvm_glue.h
• uvm_init.c
• uvm_io.c
• uvm_km.c
• uvm_km.h
• uvm_map.c
• uvm_map.h
• uvm_meter.c
• uvm_mmap.c
• uvm_object.c
• uvm_object.h
• uvm_page.c
• uvm_page.h
• uvm_pager.c
• uvm_pager.h
• uvm_param.h
• uvm_pdaemon.c
• uvm_percpu.h
• uvm_pmap.h
• uvm_pmemrange.c
• uvm_pmemrange.h
• uvm_swap.c
• uvm_swap.h
• uvm_swap_encrypt.c
• uvm_swap_encrypt.h
• uvm_unix.c
• uvm_vnode.c
• uvm_vnode.h
• uvmexp.h