kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 30992 Comm: kworker/u4:0 Not tainted 5.4.190-syzkaller-00046-g9ce4508d6de9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:tipc_conn_close+0x4a/0x130 net/tipc/topsrv.c:158 Code: 24 08 49 89 de 49 c1 ee 03 41 80 3c 2e 00 74 08 48 89 df e8 e8 28 7e fd 48 89 1c 24 48 8b 1b 48 83 c3 18 48 89 d8 48 c1 e8 03 <80> 3c 28 00 74 08 48 89 df e8 c8 28 7e fd 48 8b 1b 4c 8d bb 38 02 RSP: 0018:ffff8881e43c7c30 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffff8881f32c0000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8881c54adc00 RBP: dffffc0000000000 R08: ffffffff821c60b4 R09: ffffed103c878f87 R10: ffffed103c878f87 R11: 1ffff1103c878f86 R12: ffff8881c54adc00 R13: ffff8881ec360018 R14: 1ffff11038a95b81 R15: ffff8881ec36001c FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020404030 CR3: 00000001ec391000 CR4: 00000000003406e0 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+0x148/0x330 net/tipc/topsrv.c:715 ops_exit_list net/core/net_namespace.c:172 [inline] cleanup_net+0x654/0xca0 net/core/net_namespace.c:602 process_one_work+0x6ca/0xc40 kernel/workqueue.c:2287 worker_thread+0xae0/0x1440 kernel/workqueue.c:2433 kthread+0x2d8/0x360 kernel/kthread.c:288 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Modules linked in: ---[ end trace e8fcf31344953dea ]--- RIP: 0010:tipc_conn_close+0x4a/0x130 net/tipc/topsrv.c:158 Code: 24 08 49 89 de 49 c1 ee 03 41 80 3c 2e 00 74 08 48 89 df e8 e8 28 7e fd 48 89 1c 24 48 8b 1b 48 83 c3 18 48 89 d8 48 c1 e8 03 <80> 3c 28 00 74 08 48 89 df e8 c8 28 7e fd 48 8b 1b 4c 8d bb 38 02 RSP: 0018:ffff8881e43c7c30 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffff8881f32c0000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8881c54adc00 RBP: dffffc0000000000 R08: ffffffff821c60b4 R09: ffffed103c878f87 R10: ffffed103c878f87 R11: 1ffff1103c878f86 R12: ffff8881c54adc00 R13: ffff8881ec360018 R14: 1ffff11038a95b81 R15: ffff8881ec36001c FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6b82b56090 CR3: 00000001bdb91000 CR4: 00000000003406e0 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: 41 80 3c 2e 00 cmpb $0x0,(%r14,%rbp,1) e: 74 08 je 0x18 10: 48 89 df mov %rbx,%rdi 13: e8 e8 28 7e fd callq 0xfd7e2900 18: 48 89 1c 24 mov %rbx,(%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: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 48 89 df mov %rbx,%rdi 33: e8 c8 28 7e fd callq 0xfd7e2900 38: 48 8b 1b mov (%rbx),%rbx 3b: 4c rex.WR 3c: 8d .byte 0x8d 3d: bb .byte 0xbb 3e: 38 02 cmp %al,(%rdx)