| commit | 859bb7a8f6449d7d56cf16f96ce97e8e5f283a4e | |
| author | Matthew Dillon <dillon@apollo.backplane.com> | |
| Tue, 15 Sep 2009 19:16:00 +0000 (15 12:16 -0700) | ||
| committer | Matthew Dillon <dillon@apollo.backplane.com> | |
| Tue, 15 Sep 2009 19:20:08 +0000 (15 12:20 -0700) | ||
| tree | eb0b8dfad15f586752063e89c59e82c9b65a0453 | treesnapshot (tar.gz zip) |
| parent | 8378903f17ca598a6571279ffbc025c0c754d540 | commitdiff |
kernel - fix bug when issuing synchronous pageouts via contigmalloc.
* There are multiple mis-checks in this code but the only path that
causes the bug is if contigmalloc is forced to page data out, and
that generally only occurs due to the USB subsystem.
* The bug causes relpbuf() to be called with the wrong argument,
ultimately causing the swap pbuf availability counter to hit 0 and
stay there.
* Fixes a umass insertion failure (the usb thread was locking up).
* There are multiple mis-checks in this code but the only path that
causes the bug is if contigmalloc is forced to page data out, and
that generally only occurs due to the USB subsystem.
* The bug causes relpbuf() to be called with the wrong argument,
ultimately causing the swap pbuf availability counter to hit 0 and
stay there.
* Fixes a umass insertion failure (the usb thread was locking up).
| sys/vm/swap_pager.c | diffblobblamehistory |