general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 1 PID: 94 Comm: kworker/u4:2 Not tainted 5.15.80-syzkaller-00318-g72d681a01da5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 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 65 39 02 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 44 39 02 fd 48 8b 1b 4c 8d bb 40 RSP: 0000:ffffc9000051fb88 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffff888103dfa780 RDX: 0000000000000000 RSI: ffffffff85295ae0 RDI: ffff88810f780200 RBP: ffffc9000051fbb8 R08: ffffffff82868a23 R09: 0000000000000003 R10: fffff520000a3f69 R11: 1ffff920000a3f68 R12: ffff88810f780200 R13: ffff88810f780118 R14: 1ffff11021ef0041 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1e15d66640 CR3: 0000000115e81000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000003b DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: tipc_topsrv_stop net/tipc/topsrv.c:701 [inline] tipc_topsrv_exit_net+0x149/0x340 net/tipc/topsrv.c:723 ops_exit_list net/core/net_namespace.c:169 [inline] cleanup_net+0x6d5/0xce0 net/core/net_namespace.c:596 process_one_work+0x6db/0xc00 kernel/workqueue.c:2313 worker_thread+0xb3e/0x1340 kernel/workqueue.c:2460 kthread+0x41c/0x500 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Modules linked in: ---[ end trace 2b9ef67cd93511f6 ]--- 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 65 39 02 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 44 39 02 fd 48 8b 1b 4c 8d bb 40 RSP: 0000:ffffc9000051fb88 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffff888103dfa780 RDX: 0000000000000000 RSI: ffffffff85295ae0 RDI: ffff88810f780200 RBP: ffffc9000051fbb8 R08: ffffffff82868a23 R09: 0000000000000003 R10: fffff520000a3f69 R11: 1ffff920000a3f68 R12: ffff88810f780200 R13: ffff88810f780118 R14: 1ffff11021ef0041 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555559bf728 CR3: 0000000115e81000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000003b DR6: 00000000ffff0ff0 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 65 39 02 fd callq 0xfd02397d 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 44 39 02 fd callq 0xfd02397d 39: 48 8b 1b mov (%rbx),%rbx 3c: 4c rex.WR 3d: 8d .byte 0x8d 3e: bb .byte 0xbb 3f: 40 rex