divide error: 0000 [#1] SMP KASAN CPU: 0 PID: 31140 Comm: trinity-c12 Not tainted 4.14.0-rc6-think+ #1 task: ffff8803c0d08040 task.stack: ffff8803df548000 RIP: 0010:__tcp_select_window+0x21f/0x400 RSP: 0018:ffff8803df54f418 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff880458fd3140 RCX: ffffffff82120ea5 RDX: 0000000000000000 RSI: dffffc0000000000 RDI: ffff880458fd3a88 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000098968 R13: 1ffff1007bea9e87 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f76da1db700(0000) GS:ffff88046ae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000003f67cd002 CR4: 00000000001606f0 DR0: 00007f76d819f000 DR1: 00007f75a29f5000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: ? tcp_schedule_loss_probe+0x270/0x270 ? lock_acquire+0x12e/0x350 ? tcp_recvmsg+0x124/0x1430 ? lock_release+0x890/0x890 ? do_raw_spin_trylock+0x100/0x100 ? do_raw_spin_trylock+0x40/0x100 tcp_cleanup_rbuf+0x27d/0x2a0 ? tcp_recv_skb+0x180/0x180 ? mark_held_locks+0x70/0xa0 ? __local_bh_enable_ip+0x60/0x90 tcp_recvmsg+0x7a9/0x1430 ? tcp_recv_timestamp+0x250/0x250 ? __free_insn_slot+0x390/0x390 ? rcu_is_watching+0x88/0xd0 ? entry_SYSCALL64_slow_path+0x25/0x25 ? is_bpf_text_address+0x86/0xf0 ? kernel_text_address+0xec/0x100 ? __kernel_text_address+0xe/0x30 ? unwind_get_return_address+0x2f/0x50 ? __save_stack_trace+0x92/0x100 ? memcmp+0x45/0x70 ? match_held_lock+0x93/0x410 ? save_trace+0x1c0/0x1c0 ? save_stack+0x89/0xb0 ? save_stack+0x32/0xb0 ? kasan_kmalloc+0xa0/0xd0 ? native_sched_clock+0xf9/0x1a0 ? rw_copy_check_uvector+0x15e/0x180 inet_recvmsg+0x10b/0x360 ? inet_create+0x770/0x770 ? sched_clock_cpu+0x14/0xf0 ? sched_clock_cpu+0x14/0xf0 sock_read_iter+0x19d/0x240 ? sock_recvmsg+0x60/0x60 do_iter_readv_writev+0x2e4/0x320 ? vfs_dedupe_file_range+0x3e0/0x3e0 do_iter_read+0x149/0x280 vfs_readv+0x107/0x180 ? compat_rw_copy_check_uvector+0x1d0/0x1d0 ? fget_raw+0x10/0x10 ? __lock_is_held+0x2e/0xd0 ? do_preadv+0xf0/0xf0 ? __fdget_pos+0x82/0x110 ? __fdget_raw+0x10/0x10 ? do_readv+0xc0/0x1b0 do_readv+0xc0/0x1b0 ? vfs_readv+0x180/0x180 ? mark_held_locks+0x1b/0xa0 ? do_syscall_64+0xae/0x400 ? do_preadv+0xf0/0xf0 do_syscall_64+0x182/0x400 ? syscall_return_slowpath+0x270/0x270 ? rcu_read_lock_sched_held+0x90/0xa0 ? __context_tracking_exit.part.4+0x223/0x290 ? mark_held_locks+0x1b/0xa0 ? return_from_SYSCALL_64+0x2d/0x7a ? trace_hardirqs_on_caller+0x17a/0x250 ? trace_hardirqs_on_thunk+0x1a/0x1c entry_SYSCALL64_slow_path+0x25/0x25 RIP: 0033:0x7f76d9b05219 RSP: 002b:00007ffd41fd30d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000013 RCX: 00007f76d9b05219 RDX: 0000000000000016 RSI: 00005611ca731c70 RDI: 0000000000000179 RBP: 00007ffd41fd3180 R08: 0000000000a07395 R09: 0000000a10d65a68 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000002 R13: 00007f76da180058 R14: 00007f76da1db698 R15: 00007f76da180000 Code: 41 5e 41 5f c3 48 8d bb 48 09 00 00 e8 4b 2b 30 ff 8b 83 48 09 00 00 89 ea 44 29 f2 39 c2 7d 08 39 c5 0f 8d 86 01 00 00 89 e8 99 <41> f7 fe 89 e8 29 d0 eb 8c 41 f7 df 48 89 c7 44 89 f9 d3 fd e8 RIP: __tcp_select_window+0x21f/0x400 RSP: ffff8803df54f418
window = rounddown(free_space, mss); 45ec: 89 e8 mov %ebp,%eax 45ee: 99 cltd 45ef: 41 f7 fe idiv %r14d 45f2: 89 e8 mov %ebp,%eax 45f4: 29 d0 sub %edx,%eax 45f6: eb 8c jmp 4584 <__tcp_select_window+0x1b4> 45f8: 41 f7 df neg %r15d