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Message-ID: <6864fd66.a70a0220.3b7e22.22ba.GAE@google.com> Date: Wed, 02 Jul 2025 02:35:34 -0700 From: syzbot <syzbot+c9964a461e912b0e41a6@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, jmaloy@...hat.com, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com, tipc-discussion@...ts.sourceforge.net Subject: [syzbot] [tipc?] general protection fault in tipc_conn_close (4) Hello, syzbot found the following issue on: HEAD commit: aaf724ed6926 Merge tag 'v6.16-rc3-smb3-client-fixes' of gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13df4982580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4ad206eb0100c6a2 dashboard link: https://syzkaller.appspot.com/bug?extid=c9964a461e912b0e41a6 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/46fd31cc8b63/disk-aaf724ed.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6a4ede98a00a/vmlinux-aaf724ed.xz kernel image: https://storage.googleapis.com/syzbot-assets/9ec9bec36dfc/bzImage-aaf724ed.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c9964a461e912b0e41a6@...kaller.appspotmail.com HfR: left promiscuous mode Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 UID: 0 PID: 16606 Comm: kworker/u10:0 Tainted: G U 6.16.0-rc3-syzkaller-00306-gaaf724ed6926 #0 PREEMPT(full) Tainted: [U]=USER Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: netns cleanup_net RIP: 0010:tipc_conn_close+0x48/0x1c0 net/tipc/topsrv.c:158 Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 5b 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 08 48 8d 7d 18 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 45 01 00 00 4c 8b 6d 18 49 8d ad d8 03 00 00 48 RSP: 0018:ffffc9000ba3fa58 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff88805234ac00 RCX: 0000000000000007 RDX: 0000000000000003 RSI: ffffffff8b1ed264 RDI: 0000000000000018 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90a82757 R11: 0000000000000001 R12: ffff8881457a4c58 R13: ffffed1028af4993 R14: ffff88805234ac08 R15: ffff88805234ac00 FS: 0000000000000000(0000) GS:ffff88812475f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffbf822d88 CR3: 0000000031fe6000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> tipc_topsrv_stop net/tipc/topsrv.c:708 [inline] tipc_topsrv_exit_net+0x146/0x3b0 net/tipc/topsrv.c:730 ops_exit_list net/core/net_namespace.c:200 [inline] ops_undo_list+0x2eb/0xab0 net/core/net_namespace.c:253 cleanup_net+0x408/0x890 net/core/net_namespace.c:686 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:tipc_conn_close+0x48/0x1c0 net/tipc/topsrv.c:158 Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 5b 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 08 48 8d 7d 18 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 45 01 00 00 4c 8b 6d 18 49 8d ad d8 03 00 00 48 RSP: 0018:ffffc9000ba3fa58 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff88805234ac00 RCX: 0000000000000007 RDX: 0000000000000003 RSI: ffffffff8b1ed264 RDI: 0000000000000018 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90a82757 R11: 0000000000000001 R12: ffff8881457a4c58 R13: ffffed1028af4993 R14: ffff88805234ac08 R15: ffff88805234ac00 FS: 0000000000000000(0000) GS:ffff88812475f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1017b8bf98 CR3: 000000004ec58000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: 48 c1 ea 03 shr $0x3,%rdx 4: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 8: 0f 85 5b 01 00 00 jne 0x169 e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 15: fc ff df 18: 48 8b 6b 08 mov 0x8(%rbx),%rbp 1c: 48 8d 7d 18 lea 0x18(%rbp),%rdi 20: 48 89 fa mov %rdi,%rdx 23: 48 c1 ea 03 shr $0x3,%rdx * 27: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2b: 0f 85 45 01 00 00 jne 0x176 31: 4c 8b 6d 18 mov 0x18(%rbp),%r13 35: 49 8d ad d8 03 00 00 lea 0x3d8(%r13),%rbp 3c: 48 rex.W --- 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 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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