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From:   Aleksandr Nogikh <nogikh@google.com>
Date:   Fri, 2 Sep 2022 14:30:54 +0200
Message-ID: <CANp29Y4u7N8wVMZmCa6pY=3kKBSVDWZnhP5n_-RfQpMDWVjOOA@mail.gmail.com>
Subject: Re: [syzbot] WARNING in handle_bug (3)
To:     syzbot <syzbot+0b1ca6d5c5cd600df7a0@syzkaller.appspotmail.com>
Cc:     arve@android.com, brauner@kernel.org, cmllamas@google.com,
        gregkh@linuxfoundation.org, joel@joelfernandes.org,
        LKML <linux-kernel@vger.kernel.org>, maco@android.com,
        surenb@google.com,
        "'Aleksandr Nogikh' via syzkaller-bugs" 
        <syzkaller-bugs@googlegroups.com>, tkjos@android.com
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#syz dup: general protection fault in binder_alloc_new_buf

On Wed, Aug 24, 2022 at 10:44 AM syzbot
<syzbot+0b1ca6d5c5cd600df7a0@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    50cd95ac4654 Merge tag 'execve-v6.0-rc2' of git://git.kern..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=151e0ab5080000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=e706e91b2a433db
> dashboard link: https://syzkaller.appspot.com/bug?extid=0b1ca6d5c5cd600df7a0
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+0b1ca6d5c5cd600df7a0@syzkaller.appspotmail.com
>
> ------------[ cut here ]------------
> WARNING: CPU: 3 PID: 21395 at include/linux/mmap_lock.h:155 mmap_assert_locked include/linux/mmap_lock.h:155 [inline]
> WARNING: CPU: 3 PID: 21395 at include/linux/mmap_lock.h:155 find_vma+0xf8/0x270 mm/mmap.c:2255
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
> RAX: 00000000000023cc RBX: 0000000000000000 RCX: ffffc90003259000
> RDX: 0000000000040000 RSI: ffffffff81b5e258 RDI: 0000000000000005
> RBP: 0000000020ffc000 R08: 0000000000000005 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: ffff88801af3f840
>  <TASK>
>  binder_thread_write+0x664/0x3220 drivers/android/binder.c:3974
>  binder_ioctl_write_read drivers/android/binder.c:5024 [inline]
>  binder_ioctl+0x3470/0x6d00 drivers/android/binder.c:5311
>  vfs_ioctl fs/ioctl.c:51 [inline]
>  __do_sys_ioctl fs/ioctl.c:870 [inline]
>  __se_sys_ioctl fs/ioctl.c:856 [inline]
>  __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
>  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>  do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>  entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7f6019a89279
> Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007f601ac2a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 00007f6019b9bf80 RCX: 00007f6019a89279
> RDX: 0000000020000380 RSI: 00000000c0306201 RDI: 0000000000000004
> RBP: 00007f6019ae3189 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 00007ffd82d3b46f R14: 00007f601ac2a300 R15: 0000000000022000
>  </TASK>
> Kernel panic - not syncing: panic_on_warn set ...
> CPU: 3 PID: 21395 Comm: syz-executor.0 Not tainted 6.0.0-rc1-syzkaller-00340-g50cd95ac4654 #0
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
> Call Trace:
>  <TASK>
>  __dump_stack lib/dump_stack.c:88 [inline]
>  dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
>  panic+0x2c8/0x627 kernel/panic.c:274
>  __warn.cold+0x259/0x2c4 kernel/panic.c:624
>  report_bug+0x1bc/0x210 lib/bug.c:198
>  handle_bug+0x3c/0x60 arch/x86/kernel/traps.c:316
>  exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:336
>  asm_exc_invalid_op+0x16/0x20 arch/x86/include/asm/idtentry.h:568
> RIP: 0010:mmap_assert_locked include/linux/mmap_lock.h:155 [inline]
> RIP: 0010:find_vma+0xf8/0x270 mm/mmap.c:2255
> Code: 49 8d bc 24 28 01 00 00 be ff ff ff ff e8 a0 4a c9 07 31 ff 89 c3 89 c6 e8 75 54 c5 ff 85 db 0f 85 61 ff ff ff e8 a8 57 c5 ff <0f> 0b e9 55 ff ff ff e8 9c 57 c5 ff 4c 89 e7 e8 64 38 fb ff 0f 0b
> RSP: 0018:ffffc90003bb7530 EFLAGS: 00010212
> RAX: 00000000000023cc RBX: 0000000000000000 RCX: ffffc90003259000
> RDX: 0000000000040000 RSI: ffffffff81b5e258 RDI: 0000000000000005
> RBP: 0000000020ffc000 R08: 0000000000000005 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: ffff88801af3f840
> R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
>  vma_lookup include/linux/mm.h:2743 [inline]
>  binder_alloc_get_vma drivers/android/binder_alloc.c:340 [inline]
>  binder_alloc_new_buf_locked drivers/android/binder_alloc.c:405 [inline]
>  binder_alloc_new_buf+0xd6/0x18b0 drivers/android/binder_alloc.c:590
>  binder_transaction+0x242e/0x9a80 drivers/android/binder.c:3187
>  binder_thread_write+0x664/0x3220 drivers/android/binder.c:3974
>  binder_ioctl_write_read drivers/android/binder.c:5024 [inline]
>  binder_ioctl+0x3470/0x6d00 drivers/android/binder.c:5311
>  vfs_ioctl fs/ioctl.c:51 [inline]
>  __do_sys_ioctl fs/ioctl.c:870 [inline]
>  __se_sys_ioctl fs/ioctl.c:856 [inline]
>  __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
>  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>  do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>  entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7f6019a89279
> Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007f601ac2a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 00007f6019b9bf80 RCX: 00007f6019a89279
> RDX: 0000000020000380 RSI: 00000000c0306201 RDI: 0000000000000004
> RBP: 00007f6019ae3189 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 00007ffd82d3b46f R14: 00007f601ac2a300 R15: 0000000000022000
>  </TASK>
> Kernel Offset: disabled
> Rebooting in 86400 seconds..
>
>
> ---
> 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.
>
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>
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