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: 13066 Comm: kworker/u4:9 Not tainted 6.4.0-rc5-syzkaller-00017-ga27648c74210 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Workqueue: netns cleanup_net RIP: 0010:tipc_conn_close+0x56/0x230 net/tipc/topsrv.c:158 Code: c1 e8 03 48 89 44 24 10 42 80 3c 20 00 74 08 48 89 df e8 9d 1f 8f f7 48 89 5c 24 18 48 8b 1b 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 7b 1f 8f f7 4c 8b 3b 4d 8d af a0 RSP: 0018:ffffc90014c27ad8 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffff88807a965940 RDX: 0000000000000000 RSI: ffffffff8aea8e20 RDI: ffff88802359d000 RBP: ffff88802359d000 R08: dffffc0000000000 R09: fffffbfff206524e R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff888077546858 R14: ffff888077546898 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002004e000 CR3: 000000003c33a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tipc_topsrv_stop net/tipc/topsrv.c:708 [inline] tipc_topsrv_exit_net+0xf8/0x300 net/tipc/topsrv.c:730 ops_exit_list net/core/net_namespace.c:170 [inline] cleanup_net+0x6d2/0xb80 net/core/net_namespace.c:614 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2405 worker_thread+0xa63/0x1210 kernel/workqueue.c:2552 kthread+0x2b8/0x350 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:tipc_conn_close+0x56/0x230 net/tipc/topsrv.c:158 Code: c1 e8 03 48 89 44 24 10 42 80 3c 20 00 74 08 48 89 df e8 9d 1f 8f f7 48 89 5c 24 18 48 8b 1b 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 7b 1f 8f f7 4c 8b 3b 4d 8d af a0 RSP: 0018:ffffc90014c27ad8 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffff88807a965940 RDX: 0000000000000000 RSI: ffffffff8aea8e20 RDI: ffff88802359d000 RBP: ffff88802359d000 R08: dffffc0000000000 R09: fffffbfff206524e R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff888077546858 R14: ffff888077546898 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2dc27000 CR3: 000000007f3c7000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: c1 e8 03 shr $0x3,%eax 3: 48 89 44 24 10 mov %rax,0x10(%rsp) 8: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) d: 74 08 je 0x17 f: 48 89 df mov %rbx,%rdi 12: e8 9d 1f 8f f7 callq 0xf78f1fb4 17: 48 89 5c 24 18 mov %rbx,0x18(%rsp) 1c: 48 8b 1b mov (%rbx),%rbx 1f: 48 83 c3 18 add $0x18,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 7b 1f 8f f7 callq 0xf78f1fb4 39: 4c 8b 3b mov (%rbx),%r15 3c: 4d rex.WRB 3d: 8d .byte 0x8d 3e: af scas %es:(%rdi),%eax 3f: a0 .byte 0xa0