2014-07-10 18:02 GMT+04:00 Sasha Levin <sasha.levin@xxxxxxxxxx>: > On 07/10/2014 09:39 AM, Andrey Ryabinin wrote: >>> Anyways, the machine won't boot with more than 1GB of RAM, is there a solution to >>> > get KASAN running on my machine? >>> > >> Could you share you .config? I'll try to boot it by myself. It could be that some options conflicting with kasan. >> Also boot cmdline might help. >> > > Sure. It's the .config I use for fuzzing so it's rather big (attached). > > The cmdline is: > > [ 0.000000] Command line: noapic noacpi pci=conf1 reboot=k panic=1 i8042.direct=1 i8042.dumbkbd=1 i8042.nopnp=1 console=ttyS0 earlyprintk=serial i8042.noaux=1 numa=fake=32 init=/virt/init zcache ftrace_dump_on_oops debugpat kvm.mmu_audit=1 slub_debug=FZPU rcutorture.rcutorture_runnable=0 loop.max_loop=64 zram.num_devices=4 rcutorture.nreaders=8 oops=panic nr_hugepages=1000 numa_balancing=enable softlockup_all_cpu_backtrace=1 root=/dev/root rw rootflags=rw,trans=virtio,version=9p2000.L rootfstype=9p init=/virt/init > > And the memory map: > > [ 0.000000] e820: BIOS-provided physical RAM map: > [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable > [ 0.000000] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved > [ 0.000000] BIOS-e820: [mem 0x00000000000f0000-0x00000000000ffffe] reserved > [ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000cfffffff] usable > [ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x0000000705ffffff] usable > > > On 07/10/2014 09:50 AM, Andrey Ryabinin wrote:>> Anyways, the machine won't boot with more than 1GB of RAM, is there a solution to >>> > get KASAN running on my machine? >>> > >> It's not boot with the same Failed to allocate error? > > I think I misunderstood your question here. With >1GB is triggers a panic() when > KASAN fails the memblock allocation. With <=1GB it fails a bit later in boot just > because 1GB isn't enough to load everything - so it fails in some other random > spot as it runs on out memory. > > > Thanks, > Sasha Looks like I found where is a problem. memblock_alloc cannot allocate accross numa nodes, therefore kasan fails for numa=fake>=8. You should succeed with numa=fake=7 or less. -- Best regards, Andrey Ryabinin -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
