Re: [patch] deadlock in vm_reserv_reclaim_contig()
On Sat, Apr 11, 2015 at 7:57 PM, Alan Cox a...@rice.edu wrote: On 04/10/2015 04:11, Svatopluk Kraus wrote: Hi, my RPI-B has been stuck in vm_reserv_reclaim_contig() due to a bug within that function. I can reproduce that easily on my two-core pandaboard when I limit all memory in system to 128MiB and run make -j16 kernel-toolchain. It happens in few seconds. The patch should be self-explanatory. The problem is that there is a free page found in reservation which does not fulfill alignment requirement, thus next free page should be looked for. However, due to the bug, the same free page is found out again and again. The patch takes into account that shift by m on n-bit arch has an undefined behaviour if m = n. The patch looks correct. I'm just going to tweak the comment, and then I'll commit it. Thank you. Svatopluk Kraus ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
Re: [patch] deadlock in vm_reserv_reclaim_contig()
On 04/10/2015 04:11, Svatopluk Kraus wrote: Hi, my RPI-B has been stuck in vm_reserv_reclaim_contig() due to a bug within that function. I can reproduce that easily on my two-core pandaboard when I limit all memory in system to 128MiB and run make -j16 kernel-toolchain. It happens in few seconds. The patch should be self-explanatory. The problem is that there is a free page found in reservation which does not fulfill alignment requirement, thus next free page should be looked for. However, due to the bug, the same free page is found out again and again. The patch takes into account that shift by m on n-bit arch has an undefined behaviour if m = n. The patch looks correct. I'm just going to tweak the comment, and then I'll commit it. ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
