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Message-ID: <CACT4Y+Yt-k6vFm0ZT5TPjsJ-Sd1C_YOki8oEESyD_TjHV4r09w@mail.gmail.com>
Date: Tue, 2 May 2023 08:38:56 +0200
From: Dmitry Vyukov <dvyukov@...gle.com>
To: syzbot <syzbot+bf1c5e262f97aca4bc88@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org, maz@...nel.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 paging
request in __irq_resolve_mapping
On Sat, 29 Apr 2023 at 15:37, syzbot
<syzbot+bf1c5e262f97aca4bc88@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 36006b1d5c04 Merge tag 'ata-6.4-rc1' of git://git.kernel.o..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1014285fc80000
> kernel config: https://syzkaller.appspot.com/x/.config?x=fdfddd4c38713bb9
> dashboard link: https://syzkaller.appspot.com/bug?extid=bf1c5e262f97aca4bc88
> 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+bf1c5e262f97aca4bc88@...kaller.appspotmail.com
+arm mailing list
Kernel started falling apart on arm during boot in various strange ways.
#syz set subsystems: arm
> vkms_vblank_simulate: vblank timer overrun
> vkms_vblank_simulate: vblank timer overrun
> 8<--- cut here ---
> Unable to handle kernel paging request at virtual address 000c019f when read
> [000c019f] *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 irq_data_to_desc include/linux/irqdesc.h:124 [inline]
> PC is at __irq_resolve_mapping+0x40/0x90 kernel/irq/irqdomain.c:968
> LR is at rcu_read_lock include/linux/rcupdate.h:771 [inline]
> LR is at __irq_resolve_mapping+0x20/0x90 kernel/irq/irqdomain.c:960
> pc : [<802bd68c>] lr : [<802bd66c>] psr: 200c0193
> sp : 82401e40 ip : 82401e40 fp : 82401e5c
> r10: 825df6a1 r9 : 8241ae40 r8 : 00000000
> r7 : df80a00c r6 : 00000000 r5 : 0000001b r4 : 82894000
> r3 : 8021666c r2 : 8241ae40 r1 : 0000001b r0 : 000c0193
> Flags: nzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment user
> Control: 30c5387d Table: 840da040 DAC: fffffffd
> Register r0 information: 2-page vmalloc region starting at 0xffffffff allocated at kernel_clone+0x9c/0x3d4 kernel/fork.c:2774
> Register r1 information: 2-page vmalloc region starting at 0xffffffff allocated at kernel_clone+0x9c/0x3d4 kernel/fork.c:2774
> Register r2 information: 2-page vmalloc region starting at 0xffffffff allocated at kernel_clone+0x9c/0x3d4 kernel/fork.c:2774
> Register r3 information: 2-page vmalloc region starting at 0xffffffff allocated at kernel_clone+0x9c/0x3d4 kernel/fork.c:2774
> Register r4 information: slab kmalloc-1k start 82894000 pointer offset 0 size 1024
> Register r5 information: 2-page vmalloc region starting at 0xffffffff allocated at kernel_clone+0x9c/0x3d4 kernel/fork.c:2774
> Register r6 information: 2-page vmalloc region starting at 0xffffffff allocated at kernel_clone+0x9c/0x3d4 kernel/fork.c:2774
> Register r7 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
> 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:2571 [inline]
> PC is at vmalloc_dump_obj+0x38/0xb4 mm/vmalloc.c:4108
> 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 : [<8046b3a8>] lr : [<817ddddc>] psr: a00c0193
> sp : 82401cd0 ip : 82401cb8 fp : 82401ce4
> r10: 8241ae40 r9 : 8241c964 r8 : 8264d41c
> r7 : 600c0193 r6 : 00000008 r5 : df80b000 r4 : ffffffff
> r3 : 80216684 r2 : 00001dd7 r1 : 00000000 r0 : 00000001
> Flags: NzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment user
> Control: 30c5387d Table: 840da040 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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