INFO: task syz-executor.5:27477 blocked for more than 143 seconds. Not tainted 5.6.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29560 27477 20442 0x00000004 Call Trace: context_switch kernel/sched/core.c:3380 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4080 schedule+0xdc/0x2b0 kernel/sched/core.c:4154 __lock_sock+0x165/0x290 net/core/sock.c:2421 lock_sock_nested+0xfe/0x120 net/core/sock.c:2946 virtio_transport_release+0xc4/0xd60 net/vmw_vsock/virtio_transport_common.c:832 vsock_assign_transport+0xf3/0x3b0 net/vmw_vsock/af_vsock.c:454 vsock_stream_connect+0x2b3/0xc70 net/vmw_vsock/af_vsock.c:1288 __sys_connect_file+0x161/0x1c0 net/socket.c:1857 __sys_connect+0x174/0x1b0 net/socket.c:1874 __do_sys_connect net/socket.c:1885 [inline] __se_sys_connect net/socket.c:1882 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1882 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c479 Code: Bad RIP value. RSP: 002b:00007fcd48374c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007fcd483756d4 RCX: 000000000045c479 RDX: 0000000000000010 RSI: 0000000020000280 RDI: 0000000000000003 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000096 R14: 00000000004c2ece R15: 000000000076bf2c Showing all locks held in the system: 1 lock held by khungtaskd/1121: #0: ffffffff89bac240 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5333 1 lock held by rsyslogd/9964: 2 locks held by getty/10054: #0: ffff888098ae9090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900060cb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/10055: #0: ffff8880a01b2090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900061072e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/10056: #0: ffff8880a0612090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900060ff2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/10057: #0: ffff88809f1c1090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000611b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/10058: #0: ffff8880a86c2090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900061032e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/10059: #0: ffff888098b7e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900060ab2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/10060: #0: ffff88809abe7090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000606b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 5 locks held by kworker/u4:11/14952: 1 lock held by syz-executor.5/27477: #0: ffff8880a1c00190 (sk_lock-AF_VSOCK){+.+.}, at: lock_sock include/net/sock.h:1574 [inline] #0: ffff8880a1c00190 (sk_lock-AF_VSOCK){+.+.}, at: vsock_stream_connect+0xfb/0xc70 net/vmw_vsock/af_vsock.c:1258 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1121 Comm: khungtaskd Not tainted 5.6.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xb11/0x10c0 kernel/hung_task.c:289 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 98 Comm: kworker/u4:3 Not tainted 5.6.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: krdsd rds_tcp_accept_worker RIP: 0010:mark_held_locks+0x95/0xf0 kernel/locking/lockdep.c:3352 Code: 22 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 42 0f b6 04 30 38 d0 7f 04 84 c0 75 4c 0f b6 46 22 89 c2 83 e2 03 80 fa 01 44 89 e2 <83> da ff a8 04 74 0c 4c 89 ef e8 3c ed ff ff 85 c0 74 11 83 c3 01 RSP: 0018:ffffc90000da8538 EFLAGS: 00000097 RAX: 0000000000000004 RBX: 0000000000000001 RCX: 0000000000000002 RDX: 0000000000000002 RSI: ffff8880a9074e80 RDI: ffff8880a9074ea2 RBP: ffffc90000da8568 R08: 1ffffffff16a3790 R09: fffffbfff16a3791 R10: fffffbfff16a3790 R11: ffffffff8b51bc87 R12: 0000000000000002 R13: ffff8880a90745c0 R14: dffffc0000000000 R15: ffff8880a9074e58 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000045c44f CR3: 000000009f6fa000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __trace_hardirqs_on_caller kernel/locking/lockdep.c:3380 [inline] lockdep_hardirqs_on+0x19e/0x5e0 kernel/locking/lockdep.c:3433 trace_hardirqs_on+0x67/0x240 kernel/trace/trace_preemptirq.c:31 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x66/0xe0 kernel/locking/spinlock.c:191 __mod_timer kernel/time/timer.c:1057 [inline] mod_timer+0x507/0xc10 kernel/time/timer.c:1100 sk_reset_timer+0x24/0xd0 net/core/sock.c:2848 inet_csk_reset_keepalive_timer+0x47/0x60 net/ipv4/inet_connection_sock.c:537 tcp_rcv_state_process+0x45a4/0x52ca net/ipv4/tcp_input.c:6329 tcp_v4_do_rcv+0x351/0x8d0 net/ipv4/tcp_ipv4.c:1643 tcp_v4_rcv+0x307f/0x3b40 net/ipv4/tcp_ipv4.c:2003 ip_protocol_deliver_rcu+0x5a/0x880 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x23b/0x380 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip_local_deliver+0x1e9/0x520 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0x1db/0x2f0 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip_rcv+0xe8/0x3f0 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core+0x113/0x1a0 net/core/dev.c:5184 __netif_receive_skb+0x2c/0x1d0 net/core/dev.c:5298 process_backlog+0x226/0x780 net/core/dev.c:6130 napi_poll net/core/dev.c:6568 [inline] net_rx_action+0x508/0x1120 net/core/dev.c:6636 __do_softirq+0x262/0x98c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.0+0x11a/0x170 kernel/softirq.c:337 do_softirq kernel/softirq.c:329 [inline] __local_bh_enable_ip+0x211/0x270 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x957/0x2610 net/ipv4/ip_output.c:229 __ip_finish_output net/ipv4/ip_output.c:306 [inline] __ip_finish_output+0x604/0xc00 net/ipv4/ip_output.c:288 ip_finish_output+0x38/0x1f0 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x22b/0x680 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0xbb/0x1b0 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x878/0x1c20 net/ipv4/ip_output.c:530 ip_queue_xmit+0x5a/0x70 include/net/ip.h:237 __tcp_transmit_skb+0x1aca/0x39b0 net/ipv4/tcp_output.c:1234 tcp_transmit_skb net/ipv4/tcp_output.c:1250 [inline] tcp_write_xmit+0xfa2/0x5c70 net/ipv4/tcp_output.c:2513 __tcp_push_pending_frames+0xb4/0x350 net/ipv4/tcp_output.c:2689 tcp_send_fin+0x12a/0xd70 net/ipv4/tcp_output.c:3235 tcp_shutdown net/ipv4/tcp.c:2321 [inline] tcp_shutdown+0x107/0x130 net/ipv4/tcp.c:2306 inet_shutdown+0x1ba/0x3c0 net/ipv4/af_inet.c:879 kernel_sock_shutdown+0x59/0x70 net/socket.c:3830 rds_tcp_accept_one+0x58e/0xc00 net/rds/tcp_listen.c:245 rds_tcp_accept_worker+0x56/0x80 net/rds/tcp.c:525 process_one_work+0xa05/0x17a0 kernel/workqueue.c:2264 worker_thread+0x98/0xe40 kernel/workqueue.c:2410 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs