INFO: task syz-executor.4:27117 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.4 D29560 27117 25976 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:2413 lock_sock_nested+0xfe/0x120 net/core/sock.c:2938 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:00007fea4317cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007fea4317d6d4 RCX: 000000000045c479 RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000096 R14: 00000000004c2ece R15: 000000000076bf2c INFO: task syz-executor.4:27123 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.4 D29704 27123 25976 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:2413 lock_sock_nested+0xfe/0x120 net/core/sock.c:2938 lock_sock include/net/sock.h:1541 [inline] vsock_stream_setsockopt+0x101/0x560 net/vmw_vsock/af_vsock.c:1547 __sys_setsockopt+0x261/0x4c0 net/socket.c:2130 __do_sys_setsockopt net/socket.c:2146 [inline] __se_sys_setsockopt net/socket.c:2143 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:2143 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:00007fea4315bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fea4315c6d4 RCX: 000000000045c479 RDX: 0000000000000001 RSI: 0000000000000028 RDI: 0000000000000003 RBP: 000000000076bfc0 R08: 0000000000000112 R09: 0000000000000000 R10: 0000000020000100 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000a5b R14: 00000000004d5e28 R15: 000000000076bfcc INFO: task syz-executor.4:27148 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.4 D29704 27148 25976 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:2413 lock_sock_nested+0xfe/0x120 net/core/sock.c:2938 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:00007fea43119c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007fea4311a6d4 RCX: 000000000045c479 RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 000000000076c100 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000096 R14: 00000000004c2ece R15: 000000000076c10c Showing all locks held in the system: 1 lock held by khungtaskd/1122: #0: ffffffff89bac240 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5333 1 lock held by rsyslogd/9799: #0: ffff8880a3731120 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:821 2 locks held by getty/9889: #0: ffff8880a96d9090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000585b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9890: #0: ffff8880976ad090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000589b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9891: #0: ffff8880993cd090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000588b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9892: #0: ffff888098b7a090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000586b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9893: #0: ffff88808dc18090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000584b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9894: #0: ffff888098cfb090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900058ab2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9895: #0: ffff888090fde090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900057eb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 4 locks held by kworker/u4:16/11183: 1 lock held by syz-executor.4/27117: #0: ffff8880616b8950 (sk_lock-AF_VSOCK){+.+.}, at: lock_sock include/net/sock.h:1541 [inline] #0: ffff8880616b8950 (sk_lock-AF_VSOCK){+.+.}, at: vsock_stream_connect+0xfb/0xc70 net/vmw_vsock/af_vsock.c:1258 1 lock held by syz-executor.4/27148: #0: ffff8880616b81d0 (sk_lock-AF_VSOCK){+.+.}, at: lock_sock include/net/sock.h:1541 [inline] #0: ffff8880616b81d0 (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: 1122 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: 11183 Comm: kworker/u4:16 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_connect_worker RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:747 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:769 [inline] RIP: 0010:lock_release+0xd3/0x960 kernel/locking/lockdep.c:4498 Code: 00 00 41 8b bf 94 08 00 00 85 ff 0f 85 0b 04 00 00 48 c7 c0 b0 b0 b3 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 <0f> 85 30 07 00 00 48 83 3d 2f 8b 58 08 00 0f 84 4b 05 00 00 9c 58 RSP: 0018:ffffc90000da8230 EFLAGS: 00000246 RAX: 1ffffffff1367616 RBX: 1ffff920001b504b RCX: ffffffff86eee623 RDX: dffffc0000000000 RSI: ffffffff86eee304 RDI: 0000000000000000 RBP: ffffc90000da8300 R08: ffff8880940a83c0 R09: ffffed1015d2707c R10: ffffed1015d2707b R11: ffff8880ae9383db R12: ffffffff89bac240 R13: ffffffff86eee304 R14: ffffc90000da82d8 R15: ffff8880940a83c0 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000a276b000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_release include/linux/rcupdate.h:213 [inline] rcu_read_unlock include/linux/rcupdate.h:655 [inline] inet6_csk_route_req+0x306/0x7e0 net/ipv6/inet6_connection_sock.c:42 tcp_v6_route_req+0x2b/0x40 net/ipv6/tcp_ipv6.c:813 tcp_conn_request+0xd65/0x34c0 net/ipv4/tcp_input.c:6659 tcp_v6_conn_request net/ipv6/tcp_ipv6.c:1151 [inline] tcp_v6_conn_request+0x106/0x2b0 net/ipv6/tcp_ipv6.c:1143 tcp_rcv_state_process+0xa27/0x52ca net/ipv4/tcp_input.c:6190 tcp_v6_do_rcv+0x7e0/0x12d0 net/ipv6/tcp_ipv6.c:1463 tcp_v6_rcv+0x3473/0x3690 net/ipv6/tcp_ipv6.c:1659 ip6_protocol_deliver_rcu+0x2fe/0x1670 net/ipv6/ip6_input.c:432 ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:473 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:482 dst_input include/net/dst.h:442 [inline] ip6_rcv_finish+0x1de/0x310 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ipv6_rcv+0x10e/0x420 net/ipv6/ip6_input.c:306 __netif_receive_skb_one_core+0x113/0x1a0 net/core/dev.c:5185 __netif_receive_skb+0x2c/0x1d0 net/core/dev.c:5299 process_backlog+0x226/0x780 net/core/dev.c:6131 napi_poll net/core/dev.c:6569 [inline] net_rx_action+0x508/0x1120 net/core/dev.c:6637 __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] ip6_finish_output2+0x1101/0x25c0 net/ipv6/ip6_output.c:117 __ip6_finish_output+0x444/0xaa0 net/ipv6/ip6_output.c:142 ip6_finish_output+0x38/0x1f0 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x25e/0x880 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_xmit+0xe1a/0x2090 net/ipv6/ip6_output.c:279 inet6_csk_xmit+0x339/0x610 net/ipv6/inet6_connection_sock.c:135 __tcp_transmit_skb+0x1aca/0x39b0 net/ipv4/tcp_output.c:1234 tcp_transmit_skb net/ipv4/tcp_output.c:1250 [inline] tcp_connect+0x2f12/0x4600 net/ipv4/tcp_output.c:3657 tcp_v6_connect+0x153c/0x2150 net/ipv6/tcp_ipv6.c:334 __inet_stream_connect+0x85c/0xec0 net/ipv4/af_inet.c:655 inet_stream_connect+0x58/0xa0 net/ipv4/af_inet.c:719 rds_tcp_conn_path_connect+0x620/0x880 net/rds/tcp_connect.c:172 rds_connect_worker+0x1b6/0x2d0 net/rds/threads.c:176 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