linux-kernel - Re: [syzbot] upstream boot error: BUG: unable to handle kernel NULL pointer dereference in generic_handle_domain

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Message-ID: <CACT4Y+bw5ymJeydvpmY-M1d2ukMbYtCnQKXBXZkWOzB_mjbYrA@mail.gmail.com>
Date:   Wed, 3 May 2023 10:21:44 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+9ccf090539dced888489@...kaller.appspotmail.com>
Cc:     linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [syzbot] upstream boot error: BUG: unable to handle kernel NULL
 pointer dereference in generic_handle_domain_irq

On Tue, 2 May 2023 at 21:13, syzbot
<syzbot+9ccf090539dced888489@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    d7b3ffe2d7e4 Merge tag 'backlight-next-6.4' of git://git.k..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=14a288c4280000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=124f13edd5df0b0d
> dashboard link: https://syzkaller.appspot.com/bug?extid=9ccf090539dced888489
> 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+9ccf090539dced888489@...kaller.appspotmail.com

+arm mailing list

#syz set subsystems: arm

> 8<--- cut here ---
> Unable to handle kernel NULL pointer dereference at virtual address 0000003b when read
> [0000003b] *pgd=80000080004003, *pmd=00000000
> 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 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
> PC is at handle_irq_desc kernel/irq/irqdesc.c:651 [inline]
> PC is at generic_handle_domain_irq+0x20/0x40 kernel/irq/irqdesc.c:707
> LR is at rcu_read_unlock include/linux/rcupdate.h:805 [inline]
> LR is at __irq_resolve_mapping+0x54/0x90 kernel/irq/irqdomain.c:973
> pc : [<802b8fb8>]    lr : [<802c0e00>]    psr: a0000193
> sp : 82601e78  ip : 82601e58  fp : 82601e84
> r10: 00000000  r9 : 8261ae40  r8 : 00000000
> r7 : df80a00c  r6 : 824aebe0  r5 : df80a000  r4 : 8260cdf4
> r3 : ffffffff  r2 : 8261ae40  r1 : 0000001b  r0 : ffffffff
> Flags: NzCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment user
> Control: 30c5387d  Table: 84a1e300  DAC: fffffffd
> Register r0 information: non-paged memory
> Register r1 information: non-paged memory
> Register r2 information: non-slab/vmalloc memory
> Register r3 information: non-paged memory
> Register r4 information: non-slab/vmalloc memory
> Register r5 information:
> 8<--- cut here ---
> Unable to handle kernel NULL pointer dereference at virtual address 000001ff when read
> [000001ff] *pgd=80000080004003, *pmd=00000000
> Internal error: Oops: 207 [#2] 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 __find_vmap_area mm/vmalloc.c:841 [inline]
> PC is at find_vmap_area mm/vmalloc.c:1862 [inline]
> PC is at find_vm_area mm/vmalloc.c:2623 [inline]
> PC is at vmalloc_dump_obj+0x38/0xb4 mm/vmalloc.c:4221
> LR is at __raw_spin_lock include/linux/spinlock_api_smp.h:132 [inline]
> LR is at _raw_spin_lock+0x18/0x58 kernel/locking/spinlock.c:154
> pc : [<8047a1f0>]    lr : [<8180165c>]    psr: 20000193
> sp : 82601d08  ip : 82601cf0  fp : 82601d1c
> r10: 8261ae40  r9 : 8261c9a4  r8 : 8285041c
> r7 : 60000193  r6 : 00000006  r5 : df80a000  r4 : 00000207
> r3 : 80216638  r2 : 00002003  r1 : 00000000  r0 : 00000001
> Flags: nzCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment user
> Control: 30c5387d  Table: 84a1e300  DAC: fffffffd
>
>
> ---
> 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@...glegroups.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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