[Bug 209203] Suspend panics VESA driver

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Sat Aug 6 23:54:26 UTC 2016


--- Comment #6 from commit-hook at freebsd.org ---
A commit references this bug:

Author: jhb
Date: Sat Aug  6 23:53:34 UTC 2016
New revision: 303808
URL: https://svnweb.freebsd.org/changeset/base/303808

  MFC 303076,303225: Use MTX_SYSINIT for the VESA lock.

  vesa: fix panic on suspend

  Fix the following panic seen when migrating a FreeBSD guest on Xen:

  panic: mtx_lock() of destroyed mutex @ /usr/src/sys/dev/fb/vesa.c:541
  cpuid = 0
  KDB: stack backtrace:
  db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
  vpanic() at vpanic+0x182/frame 0xfffffe001d2fa570
  kassert_panic() at kassert_panic+0x126/frame 0xfffffe001d2fa5e0
  __mtx_lock_flags() at __mtx_lock_flags+0x15b/frame 0xfffffe001d2fa630
  vesa_bios_save_restore() at vesa_bios_save_restore+0x78/frame
  vga_suspend() at vga_suspend+0xa3/frame 0xfffffe001d2fa6b0
  isavga_suspend() at isavga_suspend+0x1d/frame 0xfffffe001d2fa6d0
  bus_generic_suspend_child() at bus_generic_suspend_child+0x44/frame

  This is caused because vga_sub_configure (which is called if the VGA adapter
  is attached after VESA tried to initialize), points to vesa_configure, which
  doesn't initialize the VESA mutex. In order to fix it, make sure
  vga_sub_configure points to vesa_load, so that all the needed vesa
  components are properly initialized.

  Use MTX_SYSINIT for the VESA lock.

  vesa_init_done isn't a reliable guard for the mutex init.  If
  vesa_configure() doesn't find valid VESA info it will not set
  vesa_init_done, but the lock will remain initialized.  Revert r303076
  and use MTX_SYSINIT to deterministically init the lock.

  PR:           209203

_U  stable/10/
_U  stable/9/sys/
_U  stable/9/sys/dev/

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