linux-kernel - Re: [syzbot] WARNING in find

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Date:   Mon, 08 Aug 2022 12:33:21 -0700
From:   syzbot <syzbot+a7b60a176ec13cafb793@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING in find_vma

syzbot has found a reproducer for the following issue on:

HEAD commit:    ca688bff68bc Add linux-next specific files for 20220808
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14807dfa080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4c20e006003cdecb
dashboard link: https://syzkaller.appspot.com/bug?extid=a7b60a176ec13cafb793
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12999232080000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15452c12080000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a7b60a176ec13cafb793@...kaller.appspotmail.com

binder: 7796:7797 ioctl c0306201 20001480 returned -14
------------[ cut here ]------------
WARNING: CPU: 1 PID: 7797 at include/linux/mmap_lock.h:155 mmap_assert_locked include/linux/mmap_lock.h:155 [inline]
WARNING: CPU: 1 PID: 7797 at include/linux/mmap_lock.h:155 find_vma+0xf8/0x270 mm/mmap.c:2255
Modules linked in:
CPU: 1 PID: 7797 Comm: syz-executor269 Not tainted 5.19.0-next-20220808-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
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 40 2e c8 07 31 ff 89 c3 89 c6 e8 85 e2 c4 ff 85 db 0f 85 61 ff ff ff e8 b8 e5 c4 ff <0f> 0b e9 55 ff ff ff e8 ac e5 c4 ff 4c 89 e7 e8 54 38 fb ff 0f 0b
RSP: 0018:ffffc9000cee7530 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88807c278000 RSI: ffffffff81b72058 RDI: 0000000000000005
RBP: 0000000020ffc000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88807dda3100
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f5fdf1fb700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000007d391000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 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+0x8a9/0x3220 drivers/android/binder.c:3963
 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: 0033:0x7f5fdf24ae19
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 15 00 00 90 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:00007f5fdf1fb318 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5fdf2d34e8 RCX: 00007f5fdf24ae19
RDX: 0000000020000680 RSI: 00000000c0306201 RDI: 0000000000000003
RBP: 00007f5fdf2d34e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5fdf2a02c0
R13: 00007ffc598955af R14: 00007f5fdf1fb400 R15: 0000000000022000
 </TASK>