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: 8 Comm: kworker/u4:0 Not tainted 6.0.0-rc5-syzkaller-00025-g3245cb65fd91 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Workqueue: netns cleanup_net RIP: 0010:tipc_conn_close+0x48/0x1c0 net/tipc/topsrv.c:157 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:ffffc900000d7bb0 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000003 RSI: ffffffff88f2de34 RDI: 0000000000000018 RBP: ffff88807c879c00 R08: 0000000000000001 R09: ffffffff908e494f R10: 0000000000000001 R11: 0000000000000000 R12: ffff88806f821458 R13: ffffed100df04293 R14: ffff88807c879c08 R15: ffff88807c879c00 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555565bc848 CR3: 000000007d647000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 000000000060000c DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: tipc_topsrv_stop net/tipc/topsrv.c:694 [inline] tipc_topsrv_exit_net+0x227/0x5d0 net/tipc/topsrv.c:715 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:163 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:595 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:tipc_conn_close+0x48/0x1c0 net/tipc/topsrv.c:157 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:ffffc900000d7bb0 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000003 RSI: ffffffff88f2de34 RDI: 0000000000000018 RBP: ffff88807c879c00 R08: 0000000000000001 R09: ffffffff908e494f R10: 0000000000000001 R11: 0000000000000000 R12: ffff88806f821458 R13: ffffed100df04293 R14: ffff88807c879c08 R15: ffff88807c879c00 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555629a708 CR3: 000000001754b000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 000000000060000c DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 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 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