Re: [syzbot] WARNING in u32_change
From: Dmitry Vyukov <dvyukov@google.com>
Date: 2022-10-06 07:55:37
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On Sun, 25 Sept 2022 at 17:38, Jamal Hadi Salim [off-list ref] wrote:
Is there a way to tell the boat "looking into it?"
Hi Jamal, No, there is no way. How do you propose the bot use that information? If it won't use it, then there is no point in telling it. Though, it makes sense to tell this to other people. But for that I guess you just leave a note on the email thread.
On Sun, Sep 25, 2022 at 7:50 AM syzbot [off-list ref] wrote:quoted
Hello, syzbot found the following issue on: HEAD commit: 483fed3b5dc8 Add linux-next specific files for 20220921 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=16becbd5080000 kernel config: https://syzkaller.appspot.com/x/.config?x=849cb9f70f15b1ba dashboard link: https://syzkaller.appspot.com/bug?extid=a2c4601efc75848ba321 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=13bc196f080000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=152b15f8880000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1cb3f4618323/disk-483fed3b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/cc02cb30b495/vmlinux-483fed3b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a2c4601efc75848ba321@syzkaller.appspotmail.com ------------[ cut here ]------------ memcpy: detected field-spanning write (size 80) of single field "&n->sel" at net/sched/cls_u32.c:1043 (size 16) WARNING: CPU: 0 PID: 3608 at net/sched/cls_u32.c:1043 u32_change+0x2962/0x3250 net/sched/cls_u32.c:1043 Modules linked in: CPU: 0 PID: 3608 Comm: syz-executor971 Not tainted 6.0.0-rc6-next-20220921-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2022 RIP: 0010:u32_change+0x2962/0x3250 net/sched/cls_u32.c:1043 Code: f4 df 14 fa 48 8b b5 78 fe ff ff b9 10 00 00 00 48 c7 c2 20 f7 f5 8a 48 c7 c7 a0 f6 f5 8a c6 05 55 b3 63 06 01 e8 db d6 df 01 <0f> 0b e9 73 f3 ff ff e8 c2 df 14 fa 48 c7 c7 00 fc f5 8a e8 66 ed RSP: 0018:ffffc90003d7f300 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffffc90003d7f618 RCX: 0000000000000000 RDX: ffff8880235f1d40 RSI: ffffffff81620348 RDI: fffff520007afe52 RBP: ffffc90003d7f4a0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 203a7970636d656d R12: ffff888021d420e0 R13: ffffc90003d7f5b8 R14: ffff888021d43c30 R15: ffff888021d42000 FS: 0000555555f71300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000064a110 CR3: 000000002824c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> tc_new_tfilter+0x938/0x2190 net/sched/cls_api.c:2146 rtnetlink_rcv_msg+0x955/0xca0 net/core/rtnetlink.c:6082 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2540 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x917/0xe10 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 ____sys_sendmsg+0x712/0x8c0 net/socket.c:2482 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2536 __sys_sendmsg+0xf3/0x1c0 net/socket.c:2565 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: 0033:0x7f97a4bf4e69 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdcaf10028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f97a4bf4e69 RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000006 RBP: 00007f97a4bb9010 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f97a4bb90a0 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> --- 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. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches-- You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/CAM0EoMnJ%3DSTtk5BnZ9oJtnkXY2Q%2BPx2cKa4gowFRGpp40UNKww%40mail.gmail.com.