riscv+KASAN does not boot

[Palmer Dabbelt]

On Fri, 25 Dec 2020 09:13:23 PST (-0800), dvyukov at google.com wrote:
> On Fri, Dec 25, 2020 at 5:58 PM Andreas Schwab <schwab at linux-m68k.org> wrote:
>>
>> On Dez 25 2020, Dmitry Vyukov wrote:
>>
>> > qemu-system-riscv64 \
>> > -machine virt -bios default -smp 1 -m 2G \
>> > -device virtio-blk-device,drive=hd0 \
>> > -drive file=buildroot-riscv64.ext4,if=none,format=raw,id=hd0 \
>> > -kernel arch/riscv/boot/Image \
>> > -nographic \
>> > -device virtio-rng-device,rng=rng0 -object
>> > rng-random,filename=/dev/urandom,id=rng0 \
>> > -netdev user,id=net0,host=10.0.2.10,hostfwd=tcp::10022-:22 -device
>> > virtio-net-device,netdev=net0 \
>> > -append "root=/dev/vda earlyprintk=serial console=ttyS0 oops=panic
>> > panic_on_warn=1 panic=86400"
>>
>> Do you get more output with earlycon=sbi?
>
> Hi Andreas,
>
> For defconfig+kvm_guest.config+ scripts/config -e KASAN -e
> KASAN_INLINE it actually gave me more output:
>
>
> OpenSBI v0.7
>    ____                    _____ ____ _____
>   / __ \                  / ____|  _ \_   _|
>  | |  | |_ __   ___ _ __ | (___ | |_) || |
>  | |  | | '_ \ / _ \ '_ \ \___ \|  _ < | |
>  | |__| | |_) |  __/ | | |____) | |_) || |_
>   \____/| .__/ \___|_| |_|_____/|____/_____|
>         | |
>         |_|
>
> Platform Name          : QEMU Virt Machine
> Platform HART Features : RV64ACDFIMSU
> Current Hart           : 0
> Firmware Base          : 0x80000000
> Firmware Size          : 132 KB
> Runtime SBI Version    : 0.2
>
> MIDELEG : 0x0000000000000222
> MEDELEG : 0x000000000000b109
> PMP0    : 0x0000000080000000-0x000000008003ffff (A)
> PMP1    : 0x0000000000000000-0xffffffffffffffff (A,R,W,X)
> [    0.000000] Linux version 5.10.0-01370-g71c5f03154ac
> (dvyukov at dvyukov-desk.muc.corp.google.com) (riscv64-linux-gnu-gcc
> (Debian 10.2.0-9) 10.2.0, GNU ld (GNU Binutils for Debian) 2.35.1) #17
> SMP Fri Dec 25 18:10:12 CET 2020
> [    0.000000] OF: fdt: Ignoring memory range 0x80000000 - 0x80200000
> [    0.000000] earlycon: sbi0 at I/O port 0x0 (options '')
> [    0.000000] printk: bootconsole [sbi0] enabled
> [    0.000000] efi: UEFI not found.
> [    0.000000] Zone ranges:
> [    0.000000]   DMA32    [mem 0x0000000080200000-0x00000000ffffffff]
> [    0.000000]   Normal   empty
> [    0.000000] Movable zone start for each node
> [    0.000000] Early memory node ranges
> [    0.000000]   node   0: [mem 0x0000000080200000-0x00000000ffffffff]
> [    0.000000] Initmem setup node 0 [mem 0x0000000080200000-0x00000000ffffffff]
> [    0.000000] SBI specification v0.2 detected
> [    0.000000] SBI implementation ID=0x1 Version=0x7
> [    0.000000] SBI v0.2 TIME extension detected
> [    0.000000] SBI v0.2 IPI extension detected
> [    0.000000] SBI v0.2 RFENCE extension detected
> [    0.000000] software IO TLB: mapped [mem
> 0x00000000fa3f9000-0x00000000fe3f9000] (64MB)
> [    0.000000] Unable to handle kernel paging request at virtual
> address dfffffc810040000
> [    0.000000] Oops [#1]
> [    0.000000] Modules linked in:
> [    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted
> 5.10.0-01370-g71c5f03154ac #17
> [    0.000000] epc: ffffffe00042e3e4 ra : ffffffe000c0462c sp : ffffffe001603ea0
> [    0.000000]  gp : ffffffe0016e3c60 tp : ffffffe00160cd40 t0 :
> dfffffc810040000
> [    0.000000]  t1 : ffffffe000e0a838 t2 : 0000000000000000 s0 :
> ffffffe001603f50
> [    0.000000]  s1 : ffffffe0016e50a8 a0 : dfffffc810040000 a1 :
> 0000000000000000
> [    0.000000]  a2 : 000000000ffc0000 a3 : dfffffc820000000 a4 :
> 0000000000000000
> [    0.000000]  a5 : 000000003e8c6001 a6 : ffffffe000e0a820 a7 :
> 0000000000000900
> [    0.000000]  s2 : dfffffc820000000 s3 : dfffffc800000000 s4 :
> 0000000000000001
> [    0.000000]  s5 : ffffffe0016e5108 s6 : fffffffffffff000 s7 :
> dfffffc810040000
> [    0.000000]  s8 : 0000000000000080 s9 : ffffffffffffffff s10:
> ffffffe07a119000
> [    0.000000]  s11: 000000000000ffc0 t3 : ffffffe0016eb908 t4 :
> 0000000000000001
> [    0.000000]  t5 : ffffffc4001c150a t6 : ffffffe001603be8
> [    0.000000] status: 0000000000000100 badaddr: dfffffc810040000
> cause: 000000000000000f
> [    0.000000] random: get_random_bytes called from
> oops_exit+0x30/0x58 with crng_init=0
> [    0.000000] ---[ end trace 0000000000000000 ]---
> [    0.000000] Kernel panic - not syncing: Fatal exception
> [    0.000000] ---[ end Kernel panic - not syncing: Fatal exception ]---
>
>
> But I first tried with a the kernel image I had in the dir, I think it
> was this config (no KASAN):
> https://gist.githubusercontent.com/dvyukov/b2b62beccf80493781ab03b41430e616/raw/62e673cff08a8a41656d2871b8a37f74b00f509f/gistfile1.txt
>
> and earlycon=sbi did not change anything (no output after OpenSBI).
> So potentially there are 2 different problems.

Thanks for reporting this.  Looks like I'd forgotten to add a kasan config to
my tests.  There's one in there now, and it's passing as of the fix that Nylon
posted.