svn commit: r290005 - head/sys/dev/xen/blkfront head/sys/x86/x86 svnadmin/tools/checkacl

[Roger Pau Monné]

Author: royger
Date: Mon Oct 26 14:50:35 2015
New Revision: 290005
URL: https://svnweb.freebsd.org/changeset/base/290005

Log:
  x86/dma_bounce: revert r289834 and r289836
  
  The new load_ma implementation can cause dereferences when used with
  certain drivers, back it out until the reason is found:
  
  Fatal trap 12: page fault while in kernel mode
  cpuid = 11; apic id = 03
  fault virtual address   = 0x30
  fault code              = supervisor read data, page not present
  instruction pointer     = 0x20:0xffffffff808a2d22
  stack pointer           = 0x28:0xfffffe07cc737710
  frame pointer           = 0x28:0xfffffe07cc737790
  code segment            = base 0x0, limit 0xfffff, type 0x1b
                          = DPL 0, pres 1, long 1, def32 0, gran 1
  processor eflags        = interrupt enabled, resume, IOPL = 0
  current process         = 13 (g_down)
  trap number             = 12
  panic: page fault
  cpuid = 11
  KDB: stack backtrace:
  #0 0xffffffff80641647 at kdb_backtrace+0x67
  #1 0xffffffff80606762 at vpanic+0x182
  #2 0xffffffff806067e3 at panic+0x43
  #3 0xffffffff8084eef1 at trap_fatal+0x351
  #4 0xffffffff8084f0e4 at trap_pfault+0x1e4
  #5 0xffffffff8084e82f at trap+0x4bf
  #6 0xffffffff80830d57 at calltrap+0x8
  #7 0xffffffff8063beab at _bus_dmamap_load_ccb+0x1fb
  #8 0xffffffff8063bc51 at bus_dmamap_load_ccb+0x91
  #9 0xffffffff8042dcad at ata_dmaload+0x11d
  #10 0xffffffff8042df7e at ata_begin_transaction+0x7e
  #11 0xffffffff8042c18e at ataaction+0x9ce
  #12 0xffffffff802a220f at xpt_run_devq+0x5bf
  #13 0xffffffff802a17ad at xpt_action_default+0x94d
  #14 0xffffffff802c0024 at adastart+0x8b4
  #15 0xffffffff802a2e93 at xpt_run_allocq+0x193
  #16 0xffffffff802c0735 at adastrategy+0xf5
  #17 0xffffffff80554206 at g_disk_start+0x426
  Uptime: 2m29s

Modified:
Directory Properties:
  vendor/   (props changed)

Changes in other areas also in this revision:
Modified:
  head/sys/dev/xen/blkfront/blkfront.c
  head/sys/x86/x86/busdma_bounce.c
Directory Properties:
  svnadmin/tools/checkacl/Makefile   (props changed)
  svnadmin/tools/checkacl/checkacl.c   (props changed)