general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 PID: 7828 Comm: kworker/u4:13 Not tainted 6.3.0-rc6-syzkaller-00183-ga7a55e27ad72 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 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 63 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5d 08 48 8d 7b 18 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 4d 01 00 00 4c 8b 6b 18 4d 8d a5 a0 03 00 00 4c RSP: 0018:ffffc90005e77bb0 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000003 RSI: ffffffff89a3d1b4 RDI: 0000000000000018 RBP: ffff888025bd1400 R08: 0000000000000001 R09: ffffffff914d2b8f R10: 0000000000000001 R11: 0000000000000000 R12: ffff88806ad2c458 R13: ffffed100d5a5893 R14: ffff888025bd1408 R15: ffff888025bd1400 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020215000 CR3: 000000007b0aa000 CR4: 00000000003506f0 Call Trace: tipc_topsrv_stop net/tipc/topsrv.c:708 [inline] tipc_topsrv_exit_net+0x146/0x3b0 net/tipc/topsrv.c:730 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:613 process_one_work+0x991/0x15c0 kernel/workqueue.c:2390 worker_thread+0x669/0x1090 kernel/workqueue.c:2537 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 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 63 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5d 08 48 8d 7b 18 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 4d 01 00 00 4c 8b 6b 18 4d 8d a5 a0 03 00 00 4c RSP: 0018:ffffc90005e77bb0 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000003 RSI: ffffffff89a3d1b4 RDI: 0000000000000018 RBP: ffff888025bd1400 R08: 0000000000000001 R09: ffffffff914d2b8f R10: 0000000000000001 R11: 0000000000000000 R12: ffff88806ad2c458 R13: ffffed100d5a5893 R14: ffff888025bd1408 R15: ffff888025bd1400 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002006a000 CR3: 000000007b0aa000 CR4: 00000000003506f0 ---------------- 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 63 01 00 00 jne 0x171 e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 15: fc ff df 18: 48 8b 5d 08 mov 0x8(%rbp),%rbx 1c: 48 8d 7b 18 lea 0x18(%rbx),%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 4d 01 00 00 jne 0x17e 31: 4c 8b 6b 18 mov 0x18(%rbx),%r13 35: 4d 8d a5 a0 03 00 00 lea 0x3a0(%r13),%r12 3c: 4c rex.WR