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Message-ID: <694bcddd.050a0220.35954c.001c.GAE@google.com> Date: Wed, 24 Dec 2025 03:26:21 -0800 From: syzbot <syzbot+dfffb6c26ee592ff9e83@...kaller.appspotmail.com> To: chuck.lever@...cle.com, davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, kernel-tls-handshake@...ts.linux.dev, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com Subject: [syzbot] [tls?] general protection fault in handshake_complete Hello, syzbot found the following issue on: HEAD commit: 92fd6e84175b Add linux-next specific files for 20251125 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1416c57c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c8705ffbbff9235f dashboard link: https://syzkaller.appspot.com/bug?extid=dfffb6c26ee592ff9e83 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17df4f42580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1418a612580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/504ec57bbfb4/disk-92fd6e84.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/90731c1057eb/vmlinux-92fd6e84.xz kernel image: https://storage.googleapis.com/syzbot-assets/7066fa5b18b8/bzImage-92fd6e84.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+dfffb6c26ee592ff9e83@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] CPU: 1 UID: 0 PID: 6046 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:handshake_complete+0x36/0x350 net/handshake/request.c:288 Code: 54 53 48 83 ec 10 48 89 54 24 08 89 f5 49 89 ff 49 bd 00 00 00 00 00 fc ff df e8 05 5b 6e f6 49 8d 5f 28 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 ab ab d4 f6 48 8b 1b 4c 8d 63 30 RSP: 0018:ffffc90003447300 EFLAGS: 00010206 RAX: 0000000000000005 RBX: 0000000000000028 RCX: ffff888025ee9e80 RDX: 0000000000000000 RSI: 00000000fffffffb RDI: 0000000000000000 RBP: 00000000fffffffb R08: ffff888027a57103 R09: 1ffff11004f4ae20 R10: dffffc0000000000 R11: ffffed1004f4ae21 R12: ffff88807867a150 R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 0000555565002500(0000) GS:ffff888125b41000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000000 CR3: 0000000075f40000 CR4: 00000000003526f0 Call Trace: <TASK> handshake_nl_accept_doit+0x3c9/0x7f0 net/handshake/netlink.c:128 genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec+0x18f/0x1d0 net/socket.c:728 __sock_sendmsg net/socket.c:743 [inline] ____sys_sendmsg+0x577/0x880 net/socket.c:2626 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2680 __sys_sendmsg net/socket.c:2712 [inline] __do_sys_sendmsg net/socket.c:2717 [inline] __se_sys_sendmsg net/socket.c:2715 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2715 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdd1638f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffcd38a9ef8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fdd165e5fa0 RCX: 00007fdd1638f749 RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000003 RBP: 00007fdd16413f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fdd165e5fa0 R14: 00007fdd165e5fa0 R15: 0000000000000003 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:handshake_complete+0x36/0x350 net/handshake/request.c:288 Code: 54 53 48 83 ec 10 48 89 54 24 08 89 f5 49 89 ff 49 bd 00 00 00 00 00 fc ff df e8 05 5b 6e f6 49 8d 5f 28 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 ab ab d4 f6 48 8b 1b 4c 8d 63 30 RSP: 0018:ffffc90003447300 EFLAGS: 00010206 RAX: 0000000000000005 RBX: 0000000000000028 RCX: ffff888025ee9e80 RDX: 0000000000000000 RSI: 00000000fffffffb RDI: 0000000000000000 RBP: 00000000fffffffb R08: ffff888027a57103 R09: 1ffff11004f4ae20 R10: dffffc0000000000 R11: ffffed1004f4ae21 R12: ffff88807867a150 R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 0000555565002500(0000) GS:ffff888125b41000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f52cc6e8286 CR3: 0000000075f40000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 54 push %rsp 1: 53 push %rbx 2: 48 83 ec 10 sub $0x10,%rsp 6: 48 89 54 24 08 mov %rdx,0x8(%rsp) b: 89 f5 mov %esi,%ebp d: 49 89 ff mov %rdi,%r15 10: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 17: fc ff df 1a: e8 05 5b 6e f6 call 0xf66e5b24 1f: 49 8d 5f 28 lea 0x28(%r15),%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 ab ab d4 f6 call 0xf6d4abe4 39: 48 8b 1b mov (%rbx),%rbx 3c: 4c 8d 63 30 lea 0x30(%rbx),%r12 --- 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@...glegroups.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
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