Hello, syzbot found the following issue on: HEAD commit: 6bfef2ec0172 Merge branch 'net-page_pool-remove-page_pool_.. git tree: net-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=131ca4e6a80000 kernel config: https://syzkaller.appspot.com/x/.config?x=8acaeb93ad7c6aaa dashboard link: https://syzkaller.appspot.com/bug?extid=376a289e86a0fd02b9ba compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14aabbaaa80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17c5cbaaa80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/4a9243441696/disk-6bfef2ec.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/aae660d02e45/vmlinux-6bfef2ec.xz kernel image: https://storage.googleapis.com/syzbot-assets/8aaadbed7a6a/bzImage-6bfef2ec.xz The issue was bisected to: commit e420bed025071a623d2720a92bc2245c84757ecb Author: Daniel Borkmann <daniel@xxxxxxxxxxxxx> Date: Wed Jul 19 14:08:52 2023 +0000 bpf: Add fd-based tcx multi-prog infra with link support bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11496cbea80000 final oops: https://syzkaller.appspot.com/x/report.txt?x=13496cbea80000 console output: https://syzkaller.appspot.com/x/log.txt?x=15496cbea80000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+376a289e86a0fd02b9ba@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: e420bed02507 ("bpf: Add fd-based tcx multi-prog infra with link support") ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5181 at kernel/bpf/tcx.c:114 tcx_uninstall+0x542/0x630 kernel/bpf/tcx.c:114 Modules linked in: CPU: 1 PID: 5181 Comm: syz-executor399 Not tainted 6.5.0-rc2-syzkaller-00549-g6bfef2ec0172 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 RIP: 0010:tcx_uninstall+0x542/0x630 kernel/bpf/tcx.c:114 Code: 4c 00 00 00 48 c7 c6 a0 0f 76 8a 48 c7 c7 e0 0f 76 8a c6 05 b7 f2 ec 0c 01 e8 ba 6b a4 ff 0f 0b e9 fc fa ff ff e8 fe a1 dd ff <0f> 0b e9 92 fd ff ff e8 f2 a1 dd ff 44 0f b6 25 93 f2 ec 0c 31 ff RSP: 0018:ffffc9000409f108 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff88801f663b80 RSI: ffffffff81a8dc32 RDI: 0000000000000001 RBP: ffff888023e16008 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888023e16008 R14: 0000000000000000 R15: 0000000000000001 FS: 00007f50a1a326c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f42a5984018 CR3: 000000002d318000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> dev_tcx_uninstall include/net/tcx.h:174 [inline] unregister_netdevice_many_notify+0x5e7/0x1a20 net/core/dev.c:10899 rtnl_delete_link net/core/rtnetlink.c:3213 [inline] rtnl_dellink+0x3c1/0xae0 net/core/rtnetlink.c:3265 rtnetlink_rcv_msg+0x439/0xd30 net/core/rtnetlink.c:6423 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2546 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x539/0x800 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x93c/0xe30 net/netlink/af_netlink.c:1911 sock_sendmsg_nosec net/socket.c:725 [inline] sock_sendmsg+0xd9/0x180 net/socket.c:748 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2494 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2548 __sys_sendmsg+0x117/0x1e0 net/socket.c:2577 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f50a1a96349 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 1a 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f50a1a32218 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f50a1b1f438 RCX: 00007f50a1a96349 RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000005 RBP: 00007f50a1b1f430 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f50a1b1f43c R13: 00007f50a1aec4f4 R14: 0031313230386c6e R15: 746361736c630001 </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@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 If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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
