block nbd4: shutting down sockets INFO: task syz-executor.4:15967 blocked for more than 140 seconds. Not tainted 4.14.221-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28880 15967 13848 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x272/0x430 kernel/sched/completion.c:123 usb_start_wait_urb+0x125/0x440 drivers/usb/core/message.c:61 usb_bulk_msg+0x1f6/0x500 drivers/usb/core/message.c:252 proc_bulk+0x331/0x6d0 drivers/usb/core/devio.c:1223 usbdev_do_ioctl+0x5b0/0x2b70 drivers/usb/core/devio.c:2449 usbdev_ioctl+0x21/0x30 drivers/usb/core/devio.c:2599 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x466019 RSP: 002b:00007f4cf266e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466019 RDX: 0000000020000000 RSI: 00000000c0185502 RDI: 0000000000000004 RBP: 00000000004bd067 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffd48788aaf R14: 00007f4cf266e300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1532: #0: (tasklist_lock){.+.?}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1532 Comm: khungtaskd Not tainted 4.14.221-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 105 Comm: kworker/u4:2 Not tainted 4.14.221-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: krdsd rds_connect_worker task: ffff8880b519c5c0 task.stack: ffff8880b51a8000 RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:27 [inline] RIP: 0010:__orc_find+0x6f/0xf0 arch/x86/kernel/unwind_orc.c:49 RSP: 0018:ffff8880ba406fc0 EFLAGS: 00000a06 RAX: 1ffffffff142873c RBX: ffffffff8a1439e0 RCX: ffffffff8137472c RDX: 0000000000000000 RSI: ffffffff8a6aebe6 RDI: ffffffff8a1439e0 RBP: ffffffff8a1439e0 R08: ffffffff8a6aebe6 R09: ffffffff8a6aebec R10: 000000000000c0ad R11: 0000000000066071 R12: ffffffff8a1439e0 R13: ffffffff8a1439e0 R14: ffffffff8a1439e0 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c012313f10 CR3: 00000000ac218000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: orc_find arch/x86/kernel/unwind_orc.c:118 [inline] unwind_next_frame+0x59a/0x17d0 arch/x86/kernel/unwind_orc.c:348 __save_stack_trace+0x90/0x160 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc mm/slab.c:3390 [inline] kmem_cache_alloc+0x111/0x3c0 mm/slab.c:3550 dst_alloc+0xed/0x6d0 net/core/dst.c:107 rt_dst_alloc+0x6b/0x430 net/ipv4/route.c:1588 __mkroute_output net/ipv4/route.c:2286 [inline] ip_route_output_key_hash_rcu+0xab7/0x29f0 net/ipv4/route.c:2516 ip_route_output_key_hash+0x195/0x2a0 net/ipv4/route.c:2344 __ip_route_output_key include/net/route.h:126 [inline] ip_route_output_flow+0x23/0x130 net/ipv4/route.c:2601 inet_csk_route_req+0x629/0xbb0 net/ipv4/inet_connection_sock.c:584 tcp_conn_request+0xd11/0x2e90 net/ipv4/tcp_input.c:6397 tcp_v4_conn_request+0xa3/0x200 net/ipv4/tcp_ipv4.c:1326 tcp_rcv_state_process+0x94e/0x4950 net/ipv4/tcp_input.c:5953 tcp_v4_do_rcv+0x2c4/0x7d0 net/ipv4/tcp_ipv4.c:1498 tcp_v4_rcv+0x31e8/0x3560 net/ipv4/tcp_ipv4.c:1740 ip_local_deliver_finish+0x3f2/0xab0 net/ipv4/ip_input.c:216 NF_HOOK include/linux/netfilter.h:250 [inline] ip_local_deliver+0x167/0x460 net/ipv4/ip_input.c:257 dst_input include/net/dst.h:476 [inline] ip_rcv_finish+0x6e3/0x19f0 net/ipv4/ip_input.c:396 NF_HOOK include/linux/netfilter.h:250 [inline] ip_rcv+0x8a7/0xf10 net/ipv4/ip_input.c:493 __netif_receive_skb_core+0x15ee/0x2a30 net/core/dev.c:4474 __netif_receive_skb+0x27/0x1a0 net/core/dev.c:4512 process_backlog+0x218/0x6f0 net/core/dev.c:5194 napi_poll net/core/dev.c:5596 [inline] net_rx_action+0x466/0xfd0 net/core/dev.c:5662 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1016 do_softirq.part.0+0x154/0x1b0 kernel/softirq.c:332 do_softirq kernel/softirq.c:324 [inline] __local_bh_enable_ip+0x12b/0x170 kernel/softirq.c:185 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:725 [inline] ip_finish_output2+0xbfc/0x1340 net/ipv4/ip_output.c:232 ip_finish_output+0x37c/0xc50 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip_output+0x1cd/0x510 net/ipv4/ip_output.c:406 dst_output include/net/dst.h:470 [inline] ip_local_out+0x93/0x170 net/ipv4/ip_output.c:125 ip_queue_xmit+0x7d3/0x1a80 net/ipv4/ip_output.c:505 __tcp_transmit_skb+0x17e2/0x2cb0 net/ipv4/tcp_output.c:1133 tcp_transmit_skb net/ipv4/tcp_output.c:1149 [inline] tcp_connect+0x2ad6/0x3f00 net/ipv4/tcp_output.c:3534 tcp_v4_connect+0x129d/0x1a70 net/ipv4/tcp_ipv4.c:255 __inet_stream_connect+0x6ad/0xb90 net/ipv4/af_inet.c:618 inet_stream_connect+0x53/0xa0 net/ipv4/af_inet.c:682 rds_tcp_conn_path_connect+0x326/0x4d0 net/rds/tcp_connect.c:135 rds_connect_worker+0x143/0x1d0 net/rds/threads.c:165 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: ec 72 4d 4c 89 e0 48 29 e8 48 89 c2 48 c1 e8 3f 48 c1 fa 02 48 01 d0 48 d1 f8 48 8d 5c 85 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 <48> 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 48 48 63 03 48