INFO: task syz-executor.3:9088 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.3 D28632 9088 8964 0x00004004 Call Trace: context_switch kernel/sched/core.c:3380 [inline] __schedule+0x87f/0xcd0 kernel/sched/core.c:4080 schedule+0x188/0x210 kernel/sched/core.c:4154 __lock_sock+0x15f/0x2a0 net/core/sock.c:2413 lock_sock_nested+0x7c/0x120 net/core/sock.c:2938 virtio_transport_release+0x5e/0xd20 net/vmw_vsock/virtio_transport_common.c:832 vsock_assign_transport+0x1e5/0x3b0 net/vmw_vsock/af_vsock.c:454 vsock_stream_connect+0x46d/0xb50 net/vmw_vsock/af_vsock.c:1288 __sys_connect_file net/socket.c:1857 [inline] __sys_connect+0x314/0x3a0 net/socket.c:1874 __do_sys_connect net/socket.c:1885 [inline] __se_sys_connect net/socket.c:1882 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:1882 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c6b9 Code: c9 76 58 4c 89 44 24 58 4c 89 0c 24 48 89 5c 24 08 48 c7 44 24 10 00 00 00 00 48 89 74 24 18 48 89 7c 24 20 48 89 54 24 28 48 <89> 4c 24 30 0f 57 c0 0f 11 44 24 38 48 c7 44 24 48 00 00 00 00 e8 RSP: 002b:00007f1e6669dc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f1e6669e6d4 RCX: 000000000045c6b9 RDX: 0000000000000010 RSI: 00000000200002c0 RDI: 0000000000000006 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000096 R14: 00000000004c3141 R15: 000000000076bf2c INFO: task syz-executor.3:9091 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.3 D28936 9091 8964 0x00004004 Call Trace: context_switch kernel/sched/core.c:3380 [inline] __schedule+0x87f/0xcd0 kernel/sched/core.c:4080 schedule+0x188/0x210 kernel/sched/core.c:4154 __lock_sock+0x15f/0x2a0 net/core/sock.c:2413 lock_sock_nested+0x7c/0x120 net/core/sock.c:2938 virtio_transport_release+0x5e/0xd20 net/vmw_vsock/virtio_transport_common.c:832 vsock_assign_transport+0x1e5/0x3b0 net/vmw_vsock/af_vsock.c:454 vsock_stream_connect+0x46d/0xb50 net/vmw_vsock/af_vsock.c:1288 __sys_connect_file net/socket.c:1857 [inline] __sys_connect+0x314/0x3a0 net/socket.c:1874 __do_sys_connect net/socket.c:1885 [inline] __se_sys_connect net/socket.c:1882 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:1882 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c6b9 Code: c9 76 58 4c 89 44 24 58 4c 89 0c 24 48 89 5c 24 08 48 c7 44 24 10 00 00 00 00 48 89 74 24 18 48 89 7c 24 20 48 89 54 24 28 48 <89> 4c 24 30 0f 57 c0 0f 11 44 24 38 48 c7 44 24 48 00 00 00 00 e8 RSP: 002b:00007f1e6667cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f1e6667d6d4 RCX: 000000000045c6b9 RDX: 0000000000000010 RSI: 00000000200002c0 RDI: 0000000000000006 RBP: 000000000076bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000096 R14: 00000000004c3141 R15: 000000000076bfcc Showing all locks held in the system: 1 lock held by khungtaskd/1137: #0: ffffffff892d9908 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30 include/linux/rcupdate.h:207 3 locks held by rs:main Q:Reg/8821: #0: ffff8880aeb37198 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1215 [inline] #0: ffff8880aeb37198 (&rq->lock){-.-.}, at: __schedule+0xdb/0xcd0 kernel/sched/core.c:4028 #1: ffffffff892d9908 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30 include/linux/rcupdate.h:207 #2: ffff888095f67508 (&sb->s_type->i_mutex_key#10){++++}, at: inode_lock include/linux/fs.h:791 [inline] #2: ffff888095f67508 (&sb->s_type->i_mutex_key#10){++++}, at: ext4_buffered_write_iter+0xa5/0x5c0 fs/ext4/file.c:264 2 locks held by rsyslogd/8823: #0: ffff8880a69af420 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x279/0x310 fs/file.c:821 #1: ffffffff892d9908 (rcu_read_lock){....}, at: syslog_print kernel/printk/printk.c:1364 [inline] #1: ffffffff892d9908 (rcu_read_lock){....}, at: do_syslog+0x1272/0x1730 kernel/printk/printk.c:1529 2 locks held by getty/8913: #0: ffff88809182f090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc9000196b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/8914: #0: ffff88809ecaa090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc9000173b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/8915: #0: ffff88809f68b090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc900017ab2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/8916: #0: ffff88809f68a090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc9000179b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/8917: #0: ffff8880979ec090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc9000197b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/8918: #0: ffff88809f0ca090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc9000199b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/8919: #0: ffff88809f2d7090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc9000170b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.3/9088: #0: ffff888097f948d0 (sk_lock-AF_VSOCK){+.+.}, at: lock_sock include/net/sock.h:1516 [inline] #0: ffff888097f948d0 (sk_lock-AF_VSOCK){+.+.}, at: vsock_stream_connect+0x110/0xb50 net/vmw_vsock/af_vsock.c:1258 1 lock held by syz-executor.3/9091: #0: ffff888091b968d0 (sk_lock-AF_VSOCK){+.+.}, at: lock_sock include/net/sock.h:1516 [inline] #0: ffff888091b968d0 (sk_lock-AF_VSOCK){+.+.}, at: vsock_stream_connect+0x110/0xb50 net/vmw_vsock/af_vsock.c:1258 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1137 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+0x1fb/0x318 lib/dump_stack.c:118 nmi_cpu_backtrace+0xaa/0x190 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x16f/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace+0x17/0x20 include/linux/nmi.h:146 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xd40/0xd60 kernel/hung_task.c:289 kthread+0x332/0x350 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 skipped: idling at native_safe_halt+0x12/0x20 arch/x86/include/asm/irqflags.h:60