On Fri, Sep 25, 2020 at 4:47 PM syzbot <syzbot+ddc7b4944bc61da19b81@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 3fc826f1 Merge branch 'net-dsa-bcm_sf2-Additional-DT-chang.. > git tree: net-next > console output: https://syzkaller.appspot.com/x/log.txt?x=158f8009900000 > kernel config: https://syzkaller.appspot.com/x/.config?x=51fb40e67d1e3dec > dashboard link: https://syzkaller.appspot.com/bug?extid=ddc7b4944bc61da19b81 > compiler: gcc (GCC) 10.1.0-syz 20200507 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16372c81900000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=100bd2c3900000 > > The issue was bisected to: > > commit 1c1efc2af158869795d3334a12fed2afd9c51539 > Author: Magnus Karlsson <magnus.karlsson@xxxxxxxxx> > Date: Fri Aug 28 08:26:17 2020 +0000 > > xsk: Create and free buffer pool independently from umem Thanks. On it. > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=157a3103900000 > final oops: https://syzkaller.appspot.com/x/report.txt?x=177a3103900000 > console output: https://syzkaller.appspot.com/x/log.txt?x=137a3103900000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+ddc7b4944bc61da19b81@xxxxxxxxxxxxxxxxxxxxxxxxx > Fixes: 1c1efc2af158 ("xsk: Create and free buffer pool independently from umem") > > RAX: ffffffffffffffda RBX: 00007fff675613c0 RCX: 0000000000443959 > RDX: 0000000000000030 RSI: 0000000020000000 RDI: 0000000000000003 > RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000001bbbbbb > R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff > R13: 0000000000000007 R14: 0000000000000000 R15: 0000000000000000 > general protection fault, probably for non-canonical address 0xdffffc00000000ad: 0000 [#1] PREEMPT SMP KASAN > KASAN: null-ptr-deref in range [0x0000000000000568-0x000000000000056f] > CPU: 0 PID: 6888 Comm: syz-executor811 Not tainted 5.9.0-rc6-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > RIP: 0010:dev_put include/linux/netdevice.h:3899 [inline] > RIP: 0010:xsk_unbind_dev net/xdp/xsk.c:521 [inline] > RIP: 0010:xsk_release+0x63f/0x7d0 net/xdp/xsk.c:591 > Code: 00 00 48 c7 85 c8 04 00 00 00 00 00 00 e8 29 a0 47 fe 48 8d bb 68 05 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 66 01 00 00 48 8b 83 68 05 00 00 65 ff 08 e9 54 > RSP: 0018:ffffc90005707c90 EFLAGS: 00010202 > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff815b9de2 > RDX: 00000000000000ad RSI: ffffffff882d2317 RDI: 0000000000000568 > RBP: ffff888091aae000 R08: 0000000000000001 R09: ffffffff8d0ffaaf > R10: fffffbfff1a1ff55 R11: 0000000000000000 R12: ffff888091aae5f8 > R13: ffff888091aae4c8 R14: dffffc0000000000 R15: 1ffff11012355cb5 > FS: 0000000000000000(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000004c8b88 CR3: 0000000093ea3000 CR4: 00000000001506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > __sock_release+0xcd/0x280 net/socket.c:596 > sock_close+0x18/0x20 net/socket.c:1277 > __fput+0x285/0x920 fs/file_table.c:281 > task_work_run+0xdd/0x190 kernel/task_work.c:141 > exit_task_work include/linux/task_work.h:25 [inline] > do_exit+0xb7d/0x29f0 kernel/exit.c:806 > do_group_exit+0x125/0x310 kernel/exit.c:903 > __do_sys_exit_group kernel/exit.c:914 [inline] > __se_sys_exit_group kernel/exit.c:912 [inline] > __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:912 > do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 > entry_SYSCALL_64_after_hwframe+0x44/0xa9 > RIP: 0033:0x442588 > Code: Bad RIP value. > RSP: 002b:00007fff67561328 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 > RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000442588 > RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001 > RBP: 00000000004c8b50 R08: 00000000000000e7 R09: ffffffffffffffd0 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 > R13: 00000000006dd280 R14: 0000000000000000 R15: 0000000000000000 > Modules linked in: > ---[ end trace 9742ad575ae08359 ]--- > RIP: 0010:dev_put include/linux/netdevice.h:3899 [inline] > RIP: 0010:xsk_unbind_dev net/xdp/xsk.c:521 [inline] > RIP: 0010:xsk_release+0x63f/0x7d0 net/xdp/xsk.c:591 > Code: 00 00 48 c7 85 c8 04 00 00 00 00 00 00 e8 29 a0 47 fe 48 8d bb 68 05 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 66 01 00 00 48 8b 83 68 05 00 00 65 ff 08 e9 54 > RSP: 0018:ffffc90005707c90 EFLAGS: 00010202 > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff815b9de2 > RDX: 00000000000000ad RSI: ffffffff882d2317 RDI: 0000000000000568 > RBP: ffff888091aae000 R08: 0000000000000001 R09: ffffffff8d0ffaaf > R10: fffffbfff1a1ff55 R11: 0000000000000000 R12: ffff888091aae5f8 > R13: ffff888091aae4c8 R14: dffffc0000000000 R15: 1ffff11012355cb5 > FS: 0000000000000000(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000004c8b88 CR3: 0000000093ea3000 CR4: 00000000001506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > > --- > 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@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > For information about bisection process see: https://goo.gl/tpsmEJ#bisection > syzbot can test patches for this issue, for details see: > https://goo.gl/tpsmEJ#testing-patches
