linux-kernel - Re: riscv+KASAN does not boot

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Date:   Fri, 25 Dec 2020 18:13:23 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Andreas Schwab <schwab@...ux-m68k.org>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>, nylon7@...estech.com,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Björn Töpel <bjorn.topel@...il.com>,
        Tobias Klauser <tklauser@...tanz.ch>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: riscv+KASAN does not boot

On Fri, Dec 25, 2020 at 5:58 PM Andreas Schwab <schwab@...ux-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@...ukov-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.