Hi Eric, We have a robot which runs CRIU tests for net-next and today it detected a new warning. It looks like it may be connected with the "tcp: switch to Early Departure Time model" series. $ git describe net-next/master rxrpc-next-20181004-1174-g53e50a6ec24d [ 107.226562] WARNING: CPU: 0 PID: 11763 at net/ipv4/tcp_input.c:3086 tcp_ack+0x10e3/0x1380 [ 107.226588] Modules linked in: [ 107.226595] CPU: 0 PID: 11763 Comm: criu Not tainted 4.19.0-rc7+ #1 [ 107.226597] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 107.226601] RIP: 0010:tcp_ack+0x10e3/0x1380 [ 107.226605] Code: 8b 0d c1 58 cc 00 85 c9 0f 84 e0 fb ff ff 0f 0b e9 d9 fb ff ff 0f 0b e9 d4 f8 ff ff 0f 0b e9 ec f8 ff ff 0f 0b e9 d5 f8 ff ff <0f> 0b e9 76 f5 ff ff 44 89 2c 24 e9 6d f8 ff ff 41 0f b6 8e b8 06 [ 107.226607] RSP: 0018:ffff95e458203b78 EFLAGS: 00010246 [ 107.226612] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000007 [ 107.226614] RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff95e44a025848 [ 107.226617] RBP: ffff95e44a025600 R08: ffff95e3fa6dcd00 R09: 0000000000000000 [ 107.226619] R10: 00000000d5e014ca R11: 0000000000000000 R12: 00000000d5e014ca [ 107.226622] R13: 0000000000000000 R14: 0000000000000001 R15: ffff95e44d927c00 [ 107.226625] FS: 000014ed29574740(0000) GS:ffff95e458200000(0000) knlGS:0000000000000000 [ 107.226628] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 107.226630] CR2: 000014ed28916f48 CR3: 00000001bcc0a000 CR4: 00000000000406f0 [ 107.226637] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 107.226640] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 107.226642] Call Trace: [ 107.226644] <IRQ> [ 107.226685] tcp_rcv_state_process+0x560/0x1160 [ 107.226692] ? lock_acquire+0x9e/0x1a0 [ 107.226702] ? tcp_v4_do_rcv+0x118/0x1c0 [ 107.226706] tcp_v4_do_rcv+0x118/0x1c0 [ 107.226711] tcp_v4_rcv+0xb5a/0xc10 [ 107.226724] ip_local_deliver_finish+0xc3/0x390 [ 107.226731] ip_local_deliver+0x185/0x240 [ 107.226738] ? ip_sublist_rcv_finish+0x90/0x90 [ 107.226745] ip_rcv+0x1af/0x1e0 [ 107.226756] ? process_backlog+0x71/0x240 [ 107.226761] __netif_receive_skb_one_core+0x52/0x70 [ 107.226767] process_backlog+0xd8/0x240 [ 107.226775] net_rx_action+0x10d/0x3f0 [ 107.226786] __do_softirq+0xd2/0x428 [ 107.226797] do_softirq_own_stack+0x2a/0x40 [ 107.226800] </IRQ> [ 107.226803] ? ip_finish_output2+0x267/0x660 [ 107.226808] do_softirq.part.19+0x5e/0x80 [ 107.226813] __local_bh_enable_ip+0xd0/0xe0 [ 107.226817] ip_finish_output2+0x290/0x660 [ 107.226820] ? ip_output+0x184/0x250 [ 107.226828] ? ip_output+0x7e/0x250 [ 107.226831] ip_output+0x7e/0x250 [ 107.226837] ? raw_sendmsg+0xe6f/0x1180 [ 107.226847] raw_sendmsg+0xa11/0x1180 [ 107.226851] ? __lock_acquire+0x2ba/0x1330 [ 107.226866] ? raw_ioctl+0xc0/0xc0 [ 107.226879] ? aa_sk_perm+0x59/0x2b0 [ 107.226888] ? sock_sendmsg+0x36/0x40 [ 107.226891] sock_sendmsg+0x36/0x40 [ 107.226896] __sys_sendto+0x10e/0x140 [ 107.226918] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 107.226925] __x64_sys_sendto+0x24/0x30 [ 107.226928] do_syscall_64+0x60/0x1b0 [ 107.226933] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 107.226937] RIP: 0033:0x14ed2915ca03 [ 107.226940] Code: 48 8b 0d a8 95 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 49 da 20 00 00 75 13 49 89 ca b8 2c 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 fb f3 ff ff 48 89 04 24 [ 107.226943] RSP: 002b:00007ffe119e0a98 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 107.226947] RAX: ffffffffffffffda RBX: 00000000021d0230 RCX: 000014ed2915ca03 [ 107.226950] RDX: 0000000000000028 RSI: 00000000021d0410 RDI: 0000000000000007 [ 107.226952] RBP: 0000000000000001 R08: 00007ffe119e0ab0 R09: 0000000000000010 [ 107.226954] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000028 [ 107.226957] R13: 00000000021d0810 R14: 0000000000000010 R15: 00000000021d0230 [ 107.226971] irq event stamp: 160203 [ 107.226977] hardirqs last enabled at (160202): [<ffffffffa713db49>] ktime_get+0x79/0x130 [ 107.226981] hardirqs last disabled at (160203): [<ffffffffa7001b6a>] trace_hardirqs_off_thunk+0x1a/0x1c [ 107.226984] softirqs last enabled at (160192): [<ffffffffa7a31fd7>] ip_finish_output2+0x267/0x660 [ 107.226988] softirqs last disabled at (160193): [<ffffffffa7c00e3a>] do_softirq_own_stack+0x2a/0x40 [ 107.226990] ---[ end trace 832c232846a4fecb ]--- https://travis-ci.org/avagin/linux/jobs/442998029 Thanks, Andrei
