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AFNElJ+7Jzkl7jy2BXLhUiTAXLD/hecyQmluzxTh1QK2VLdfBzfJSn5fTRO2N1jbfGqQpEWjjIvB5xQ=@vger.kernel.org X-Gm-Message-State: AOJu0YwU5h1vuCaFQppw9yFcSTgZR28nWbyhahgnvUGnKJBbqVBnNGkC Ge2tv+UveIA2n2HYHKlKR4cZdocujds1NQx+yuASAuUJ6fOEUL6dk/+USpDoR3kQk2LdNF7MgN9 55rdGXcrkZg8nZt7atm2tdSyyJ2Z8E5YefPlnEHLeEu0Q9Ia15dBMEV4+L/Q= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:8c2:b0:694:9071:b622 with SMTP id 006d021491bc7-69c9bfc7cacmr12427123eaf.52.1779191791565; Tue, 19 May 2026 04:56:31 -0700 (PDT) Date: Tue, 19 May 2026 04:56:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a0c4fef.170a0220.25463a.022d.GAE@google.com> Subject: [syzbot] [net?] WARNING in netif_rx_mode_run From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: c8993263ffd3 bpf: Add Jiayuan Chen to sockmap maintainers git tree: bpf-next console output: https://syzkaller.appspot.com/x/log.txt?x=156e9bce580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4caf64b1ee83dac0 dashboard link: https://syzkaller.appspot.com/bug?extid=f2421634072a4b47071e compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=121aee36580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=136e9bce580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/bd0898114f61/disk-c8993263.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2b3988a1716d/vmlinux-c8993263.xz kernel image: https://storage.googleapis.com/syzbot-assets/eedc9b64bb9f/bzImage-c8993263.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f2421634072a4b47071e@syzkaller.appspotmail.com RSP: 002b:00007ffde2b3c518 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fece9c15fa0 RCX: 00007fece999ce59 RDX: 0000200000000000 RSI: 0000000000008931 RDI: 0000000000000003 RBP: 00007ffde2b3c580 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fece9c15fac R14: 00007fece9c15fa0 R15: 00007fece9c15fa0 ------------[ cut here ]------------ netdevice: dummy0: failed to sync uc/mc addresses WARNING: net/core/dev_addr_lists.c:1278 at netif_rx_mode_run+0xd55/0x1290 net/core/dev_addr_lists.c:1278, CPU#1: syz.0.17/5854 Modules linked in: CPU: 1 UID: 0 PID: 5854 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:netif_rx_mode_run+0xe82/0x1290 net/core/dev_addr_lists.c:1278 Code: 3a 48 c7 c2 a0 ec dd 8c eb 1a e8 e9 8a 43 f8 48 c7 c2 20 eb dd 8c eb 0c e8 db 8a 43 f8 48 c7 c2 20 ec dd 8c 4c 89 f7 4c 89 fe <67> 48 0f b9 3a 48 8b 5c 24 38 48 8b 7c 24 48 e8 da be 29 02 42 c7 RSP: 0018:ffffc90002e2f9e0 EFLAGS: 00010293 RAX: ffffffff898241b7 RBX: 0000000000000001 RCX: ffff88802dcd5c40 RDX: ffffffff8cddeb20 RSI: ffff888025bb6120 RDI: ffffffff903fb9d0 RBP: ffffc90002e2fbb8 R08: ffff88802dcd5c40 R09: 0000000000000006 R10: 0000000000000005 R11: 0000000000000000 R12: ffff888025bb6120 R13: dffffc0000000000 R14: ffffffff903fb9d0 R15: ffff888025bb6120 FS: 000055556040b500(0000) GS:ffff888125388000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000000 CR3: 0000000033696000 CR4: 00000000003526f0 Call Trace: netif_rx_mode_sync+0x171/0x1e0 net/core/dev_addr_lists.c:1428 dev_ifsioc+0xf51/0x1330 net/core/dev_ioctl.c:596 dev_ioctl+0x7b4/0x1150 net/core/dev_ioctl.c:816 sock_do_ioctl+0x23e/0x320 net/socket.c:1327 sock_ioctl+0x5c6/0x7f0 net/socket.c:1434 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fece999ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffde2b3c518 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fece9c15fa0 RCX: 00007fece999ce59 RDX: 0000200000000000 RSI: 0000000000008931 RDI: 0000000000000003 RBP: 00007ffde2b3c580 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fece9c15fac R14: 00007fece9c15fa0 R15: 00007fece9c15fa0 ---------------- Code disassembly (best guess): 0: 3a 48 c7 cmp -0x39(%rax),%cl 3: c2 a0 ec ret $0xeca0 6: dd 8c eb 1a e8 e9 8a fisttpll -0x751617e6(%rbx,%rbp,8) d: 43 f8 rex.XB clc f: 48 c7 c2 20 eb dd 8c mov $0xffffffff8cddeb20,%rdx 16: eb 0c jmp 0x24 18: e8 db 8a 43 f8 call 0xf8438af8 1d: 48 c7 c2 20 ec dd 8c mov $0xffffffff8cddec20,%rdx 24: 4c 89 f7 mov %r14,%rdi 27: 4c 89 fe mov %r15,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 48 8b 5c 24 38 mov 0x38(%rsp),%rbx 34: 48 8b 7c 24 48 mov 0x48(%rsp),%rdi 39: e8 da be 29 02 call 0x229bf18 3e: 42 rex.X 3f: c7 .byte 0xc7 --- 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. If the report is already addressed, 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 overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup