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Thu, 18 Jun 2026 15:22:29 -0700 (PDT) Received: from [192.168.10.115] ([132.170.207.48]) by smtp.gmail.com with ESMTPSA id 71dfb90a1353d-5bbea1889e6sm739338e0c.8.2026.06.18.15.22.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Jun 2026 15:22:28 -0700 (PDT) Message-ID: <6a346fa4.26cc5c6d.1ace13.9d21@mx.google.com> Date: Thu, 18 Jun 2026 15:22:28 -0700 (PDT) Subject: general protection fault in fou_nl_add_doit To: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: syzkaller@googlegroups.com, contact@pgazz.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: sanan.hasanou@gmail.com Good day, dear maintainers, We found a bug using a modified version of syzkaller. Kernel Branch: 7.0-rc1 Kernel Config: Reproducer: Thank you! Best regards, Sanan Hasanov Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 UID: 0 PID: 326872 Comm: syz.6.71753 Tainted: G L 7.0.0-rc1 #1 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:fou_create net/ipv4/fou_core.c:590 [inline] RIP: 0010:fou_nl_add_doit+0x236/0xaa0 net/ipv4/fou_core.c:764 Code: 48 89 da 4d 89 2c 24 48 85 d2 0f 84 eb 07 00 00 4c 8b 6c 24 60 49 8d 5d 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 48 89 54 24 10 74 0d 48 89 df e8 47 c2 90 f8 48 8b 54 RSP: 0018:ffffc9002b54f260 EFLAGS: 00010216 RAX: 0000000000000003 RBX: 0000000000000018 RCX: dffffc0000000000 RDX: ffff88801aeb8d00 RSI: 00000000000002d1 RDI: 00000000ffffffff RBP: ffffc9002b54f3d0 R08: ffffffff8ef0f1bf R09: 1ffffffff1de1e37 R10: dffffc0000000000 R11: fffffbfff1de1e38 R12: ffff88801d9a3a38 R13: 0000000000000000 R14: ffff88802440dd00 R15: ffffc9002b54f440 FS: 00007f863f9266c0(0000) GS:ffff88809d305000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c40b6a1 CR3: 0000000026d9b000 CR4: 00000000000006f0 Call Trace: genl_family_rcv_msg_doit+0x20d/0x2f0 net/netlink/genetlink.c:1114 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline] genl_rcv_msg+0x60c/0x790 net/netlink/genetlink.c:1209 netlink_rcv_skb+0x206/0x460 net/netlink/af_netlink.c:2550 genl_rcv+0x31/0x40 net/netlink/genetlink.c:1218 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0xa42/0xc00 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x7ed/0xb00 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0x4dd/0x8e0 net/socket.c:2592 ___sys_sendmsg+0x1ee/0x260 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x189/0x240 net/socket.c:2681 x64_sys_call+0x17a2/0x2900 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x110/0x8a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7f86416d3b6d Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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:00007f863f926018 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f8641945fa0 RCX: 00007f86416d3b6d RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000003 RBP: 00007f8641777c3e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8641946038 R14: 00007f8641945fa0 R15: 00007ffce4a75000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:fou_create net/ipv4/fou_core.c:590 [inline] RIP: 0010:fou_nl_add_doit+0x236/0xaa0 net/ipv4/fou_core.c:764 Code: 48 89 da 4d 89 2c 24 48 85 d2 0f 84 eb 07 00 00 4c 8b 6c 24 60 49 8d 5d 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 48 89 54 24 10 74 0d 48 89 df e8 47 c2 90 f8 48 8b 54 RSP: 0018:ffffc9002b54f260 EFLAGS: 00010216 RAX: 0000000000000003 RBX: 0000000000000018 RCX: dffffc0000000000 RDX: ffff88801aeb8d00 RSI: 00000000000002d1 RDI: 00000000ffffffff RBP: ffffc9002b54f3d0 R08: ffffffff8ef0f1bf R09: 1ffffffff1de1e37 R10: dffffc0000000000 R11: fffffbfff1de1e38 R12: ffff88801d9a3a38 R13: 0000000000000000 R14: ffff88802440dd00 R15: ffffc9002b54f440 FS: 00007f863f9266c0(0000) GS:ffff88809d305000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc1ad9e3080 CR3: 0000000026d9b000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: 48 89 da mov %rbx,%rdx 3: 4d 89 2c 24 mov %r13,(%r12) 7: 48 85 d2 test %rdx,%rdx a: 0f 84 eb 07 00 00 je 0x7fb 10: 4c 8b 6c 24 60 mov 0x60(%rsp),%r13 15: 49 8d 5d 18 lea 0x18(%r13),%rbx 19: 48 89 d8 mov %rbx,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 48 89 54 24 10 mov %rdx,0x10(%rsp) 33: 74 0d je 0x42 35: 48 89 df mov %rbx,%rdi 38: e8 47 c2 90 f8 call 0xf890c284 3d: 48 rex.W 3e: 8b .byte 0x8b 3f: 54 push %rsp <<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>>