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From:   Dmitry Vyukov <dvyukov@google.com>
Date:   Tue, 2 May 2023 08:38:35 +0200
Message-ID: <CACT4Y+Y6qkdhEtTb1XNrhd759ybEHk6138o7yK7kr-+OKcDHKQ@mail.gmail.com>
Subject: Re: [syzbot] upstream boot error: BUG: unable to handle kernel paging
 request in gic_handle_irq
To:     syzbot <syzbot+4aee2040dfac273d198e@syzkaller.appspotmail.com>
Cc:     geert+renesas@glider.be, linux-kernel@vger.kernel.org,
        linux-renesas-soc@vger.kernel.org, magnus.damm@gmail.com,
        maz@kernel.org, syzkaller-bugs@googlegroups.com,
        tglx@linutronix.de,
        Linux ARM <linux-arm-kernel@lists.infradead.org>
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On Sat, 29 Apr 2023 at 15:37, syzbot
<syzbot+4aee2040dfac273d198e@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    cec24b8b6bb8 Merge tag 'char-misc-6.4-rc1' of git://git.ke..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=11334c30280000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c159a5b5ee7dcf56
> dashboard link: https://syzkaller.appspot.com/bug?extid=4aee2040dfac273d198e
> compiler:       arm-linux-gnueabi-gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> userspace arch: arm
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+4aee2040dfac273d198e@syzkaller.appspotmail.com


+arm mailing list

Kernel started falling apart on arm during boot in various strange ways.

#syz set subsystems: arm

> 8<--- cut here ---
> Unable to handle kernel paging request at virtual address df80a00c when read
> [df80a00c] *pgd=80000080007003, *pmd=82893003, *pte=80216680
> Internal error: Oops: 207 [#1] PREEMPT SMP ARM
> Modules linked in:
> CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.3.0-syzkaller #0
> Hardware name: ARM-Versatile Express
> PC is at __raw_readl arch/arm/include/asm/io.h:113 [inline]
> PC is at gic_handle_irq+0x1c/0x7c drivers/irqchip/irq-gic.c:344
> LR is at generic_handle_arch_irq+0x60/0x80 kernel/irq/handle.c:238
> pc : [<8086e724>]    lr : [<817e3dd0>]    psr: 20000193
> sp : 82401e70  ip : 82401e90  fp : 82401e8c
> r10: 825dfffd  r9 : 8241ae40  r8 : 00000000
> r7 : df80a00c  r6 : 81f1590c  r5 : df80a000  r4 : 8240cde8
> r3 : 8086e708  r2 : 00904870  r1 : 81f4ff24  r0 : 82401eb8
> Flags: nzCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment user
> Control: 30c5387d  Table: 80003000  DAC: fffffffd
> Register r0 information:
> 8<--- cut here ---
> Unable to handle kernel paging request at virtual address fffffff7 when read
> [fffffff7] *pgd=80000080007003, *pmd=deffd003, *pte=00000000
> Internal error: Oops: 207 [#2] PREEMPT SMP ARM
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the bug is already fixed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> If you want to change bug's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
>
> If the bug is a duplicate of another bug, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup
>
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