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: 177 Comm: kworker/u4:2 Not tainted 5.10.147-syzkaller-01341-gbc7618b4936f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Workqueue: netns cleanup_net RIP: 0010:tipc_conn_close+0x4d/0x130 net/tipc/topsrv.c:157 Code: 24 08 49 89 de 49 c1 ee 03 43 80 3c 3e 00 74 08 48 89 df e8 95 6f 25 fd 48 89 5d d0 48 8b 1b 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 74 6f 25 fd 48 8b 1b 4c 8d bb 38 RSP: 0018:ffffc90000c67ba8 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffff888115a7a780 RDX: 0000000000000000 RSI: ffffffff84e8d600 RDI: ffff88810c65b100 RBP: ffffc90000c67bd8 R08: ffffffff826cd94e R09: 0000000000000003 R10: fffff5200018cf6d R11: 1ffff9200018cf6c R12: ffff88810c65b100 R13: ffff8881507ab418 R14: 1ffff110218cb621 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556f32728 CR3: 0000000119ee6000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tipc_topsrv_stop net/tipc/topsrv.c:694 [inline] tipc_topsrv_exit_net+0x149/0x340 net/tipc/topsrv.c:715 ops_exit_list net/core/net_namespace.c:187 [inline] cleanup_net+0x6e4/0xd70 net/core/net_namespace.c:608 process_one_work+0x726/0xc10 kernel/workqueue.c:2296 worker_thread+0xb27/0x1550 kernel/workqueue.c:2442 kthread+0x349/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:299 Modules linked in: ---[ end trace 6b6fff57f66a9bf1 ]--- RIP: 0010:tipc_conn_close+0x4d/0x130 net/tipc/topsrv.c:157 Code: 24 08 49 89 de 49 c1 ee 03 43 80 3c 3e 00 74 08 48 89 df e8 95 6f 25 fd 48 89 5d d0 48 8b 1b 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 74 6f 25 fd 48 8b 1b 4c 8d bb 38 RSP: 0018:ffffc90000c67ba8 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffff888115a7a780 RDX: 0000000000000000 RSI: ffffffff84e8d600 RDI: ffff88810c65b100 RBP: ffffc90000c67bd8 R08: ffffffff826cd94e R09: 0000000000000003 R10: fffff5200018cf6d R11: 1ffff9200018cf6c R12: ffff88810c65b100 R13: ffff8881507ab418 R14: 1ffff110218cb621 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3445238ef0 CR3: 0000000111077000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 24 08 and $0x8,%al 2: 49 89 de mov %rbx,%r14 5: 49 c1 ee 03 shr $0x3,%r14 9: 43 80 3c 3e 00 cmpb $0x0,(%r14,%r15,1) e: 74 08 je 0x18 10: 48 89 df mov %rbx,%rdi 13: e8 95 6f 25 fd callq 0xfd256fad 18: 48 89 5d d0 mov %rbx,-0x30(%rbp) 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 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 74 6f 25 fd callq 0xfd256fad 39: 48 8b 1b mov (%rbx),%rbx 3c: 4c rex.WR 3d: 8d .byte 0x8d 3e: bb .byte 0xbb 3f: 38 .byte 0x38