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davem@davemloft.net, edumazet@kernel.org, horms@kernel.org, jmaloy@redhat.com, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com, tipc-discussion@lists.sourceforge.net, tung.quang.nguyen@est.tech Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 20a33c6b6cbe Add linux-next specific files for 20261023 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1000e5e0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b72dfd5e7ab2b781 dashboard link: https://syzkaller.appspot.com/bug?extid=64197f7577a09686ffdb compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15c25b0d580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13c25b0d580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/cfbd1ccc6546/disk-20a33c6b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c36184d6a775/vmlinux-20a33c6b.xz kernel image: https://storage.googleapis.com/syzbot-assets/48b7e871397c/bzImage-20a33c6b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+64197f7577a09686ffdb@syzkaller.appspotmail.com tipc: Enabling of bearer rejected, already enabled Oops: general protection fault, probably for non-canonical address 0xdffffc000000001b: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000000d8-0x00000000000000df] CPU: 1 UID: 0 PID: 6165 Comm: syz.4.85 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 RIP: 0010:buf_msg net/tipc/msg.h:202 [inline] RIP: 0010:named_distribute net/tipc/name_distr.c:195 [inline] RIP: 0010:tipc_named_node_up+0x8e0/0xb00 net/tipc/name_distr.c:221 Code: 41 2b f6 48 8d b4 24 80 00 00 00 48 8b 84 24 88 00 00 00 31 db 48 39 f0 48 0f 45 d8 48 81 c3 d8 00 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 10 48 89 df e8 21 12 a2 f6 48 8d b4 24 80 00 00 RSP: 0018:ffffc9000407f2e0 EFLAGS: 00010206 RAX: 000000000000001b RBX: 00000000000000d8 RCX: ffff88802a719f40 RDX: 0000000000000000 RSI: ffffc9000407f360 RDI: 0000000000000001 RBP: ffffc9000407f430 R08: ffff8880352dc007 R09: 1ffff11006a5b800 R10: dffffc0000000000 R11: ffffed1006a5b801 R12: ffff88805d6e4000 R13: dffffc0000000000 R14: 0000000000000456 R15: ffff88805d6e6020 FS: 0000555560621500(0000) GS:ffff888123511000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffd16d5c70 CR3: 0000000077bdc000 CR4: 00000000003526f0 Call Trace: tipc_node_write_unlock+0x2ce/0x4f0 net/tipc/node.c:428 tipc_rcv+0xb55/0x1020 net/tipc/node.c:2196 tipc_l2_rcv_msg+0x2d9/0x470 net/tipc/bearer.c:671 __netif_receive_skb_one_core net/core/dev.c:6405 [inline] __netif_receive_skb net/core/dev.c:6518 [inline] netif_receive_skb_internal net/core/dev.c:6604 [inline] netif_receive_skb+0x4af/0xbf0 net/core/dev.c:6663 tun_rx_batched+0x1de/0x790 drivers/net/tun.c:1575 tun_get_user+0x2b78/0x4470 drivers/net/tun.c:2053 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:2100 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:1036 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f737d15fd8e Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08 RSP: 002b:00007fff46919968 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000555560621500 RCX: 00007f737d15fd8e RDX: 0000000000000046 RSI: 0000200000000140 RDI: 00000000000000c8 RBP: 00007f737d236b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f737d425fac R14: 00007f737d425fa0 R15: 00007f737d425fa0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:buf_msg net/tipc/msg.h:202 [inline] RIP: 0010:named_distribute net/tipc/name_distr.c:195 [inline] RIP: 0010:tipc_named_node_up+0x8e0/0xb00 net/tipc/name_distr.c:221 Code: 41 2b f6 48 8d b4 24 80 00 00 00 48 8b 84 24 88 00 00 00 31 db 48 39 f0 48 0f 45 d8 48 81 c3 d8 00 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 10 48 89 df e8 21 12 a2 f6 48 8d b4 24 80 00 00 RSP: 0018:ffffc9000407f2e0 EFLAGS: 00010206 RAX: 000000000000001b RBX: 00000000000000d8 RCX: ffff88802a719f40 RDX: 0000000000000000 RSI: ffffc9000407f360 RDI: 0000000000000001 RBP: ffffc9000407f430 R08: ffff8880352dc007 R09: 1ffff11006a5b800 R10: dffffc0000000000 R11: ffffed1006a5b801 R12: ffff88805d6e4000 R13: dffffc0000000000 R14: 0000000000000456 R15: ffff88805d6e6020 FS: 0000555560621500(0000) GS:ffff888123511000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffd16d5c70 CR3: 0000000077bdc000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 41 2b f6 sub %r14d,%esi 3: 48 8d b4 24 80 00 00 lea 0x80(%rsp),%rsi a: 00 b: 48 8b 84 24 88 00 00 mov 0x88(%rsp),%rax 12: 00 13: 31 db xor %ebx,%ebx 15: 48 39 f0 cmp %rsi,%rax 18: 48 0f 45 d8 cmovne %rax,%rbx 1c: 48 81 c3 d8 00 00 00 add $0xd8,%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 10 je 0x41 31: 48 89 df mov %rbx,%rdi 34: e8 21 12 a2 f6 call 0xf6a2125a 39: 48 rex.W 3a: 8d .byte 0x8d 3b: b4 24 mov $0x24,%ah 3d: 80 00 00 addb $0x0,(%rax) --- 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