INFO: task syz-executor149:8714 blocked for more than 143 seconds. Not tainted 5.4.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor149 D28816 8714 8711 0x00000004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x909/0x1ee0 kernel/sched/core.c:4079 schedule+0xdc/0x2b0 kernel/sched/core.c:4153 __lock_sock+0x165/0x290 net/core/sock.c:2413 lock_sock_nested+0xfe/0x120 net/core/sock.c:2938 virtio_transport_release+0xc4/0xcb0 net/vmw_vsock/virtio_transport_common.c:822 vsock_assign_transport+0xea/0x330 net/vmw_vsock/af_vsock.c:437 vsock_stream_connect+0x2b3/0xbe0 net/vmw_vsock/af_vsock.c:1268 __sys_connect+0x264/0x330 net/socket.c:1846 __do_sys_connect net/socket.c:1857 [inline] __se_sys_connect net/socket.c:1854 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1854 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4457f9 Code: Bad RIP value. RSP: 002b:00007f0ffc84fdb8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00000000006dac28 RCX: 00000000004457f9 RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac2c R13: 00007ffc3b38375f R14: 00007f0ffc8509c0 R15: 20c49ba5e353f7cf Showing all locks held in the system: 1 lock held by khungtaskd/1071: #0: ffffffff88fac3c0 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5337 1 lock held by rsyslogd/8599: 3 locks held by getty/8689: #0: ffff8880a41abde0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 #1: ffff8880939db090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #2: ffffc90005f252e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 3 locks held by getty/8690: #0: ffff8880a83b9de0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 #1: ffff8880a1be5090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #2: ffffc90005f352e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 3 locks held by getty/8691: #0: ffff8880a28150e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 #1: ffff8880a752c090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #2: ffffc90005f1d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 3 locks held by getty/8692: #0: ffff88809aea78a0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 #1: ffff8880a70dd090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #2: ffffc90005f312e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 3 locks held by getty/8693: #0: ffff8880a459b8a0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 #1: ffff8880948fd090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #2: ffffc90005f392e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 3 locks held by getty/8694: #0: ffff88809173f0e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 #1: ffff8880a7532090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #2: ffffc90005f192e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 3 locks held by getty/8695: #0: ffff88809a68e5e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 #1: ffff8880a0486090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #2: ffffc90005f092e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 1 lock held by syz-executor149/8714: #0: ffff8880a51cf8d0 (sk_lock-AF_VSOCK){+.+.}, at: lock_sock include/net/sock.h:1526 [inline] #0: ffff8880a51cf8d0 (sk_lock-AF_VSOCK){+.+.}, at: vsock_stream_connect+0xfb/0xbe0 net/vmw_vsock/af_vsock.c:1238 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1071 Comm: khungtaskd Not tainted 5.4.0-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+0x9d0/0xef0 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x3b4/0x4a00 kernel/locking/lockdep.c:3896 Code: 41 c1 e7 13 44 09 e9 48 c1 ea 03 48 b8 00 00 00 00 00 fc ff df 44 09 c9 44 8b 4d 20 41 09 cf 41 c1 e1 14 45 09 cf 45 8b 4a 20 <41> 81 e1 ff 1f 00 00 45 09 cf 45 89 7a 20 0f b6 14 02 48 89 f8 83 RSP: 0018:ffff8880ae809d38 EFLAGS: 00000006 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000060000 RDX: 1ffffffff11cf54f RSI: 0000000000000037 RDI: ffffffff88e7aa7c RBP: ffff8880ae809e50 R08: 0000000000000001 R09: 00000000000c0037 R10: ffffffff88e7aa58 R11: ffffffff88e7a1c0 R12: 0000000000000037 R13: 0000000000000000 R14: 0000000000000000 R15: 00000000000e0000 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000a8bf8000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4487 seqcount_lockdep_reader_access include/linux/seqlock.h:81 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] ktime_get kernel/time/timekeeping.c:757 [inline] ktime_get+0xd2/0x300 kernel/time/timekeeping.c:747 tick_nohz_irq_enter kernel/time/tick-sched.c:1253 [inline] tick_irq_enter+0xb5/0x3f0 kernel/time/tick-sched.c:1274 irq_enter+0xbd/0xe0 kernel/softirq.c:354 scheduler_ipi+0x28e/0x640 kernel/sched/core.c:2338 smp_reschedule_interrupt+0x78/0x4c0 arch/x86/kernel/smp.c:244 reschedule_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:854 RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61 Code: 28 c2 59 fa eb 8a 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 94 e7 51 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 84 e7 51 00 fb f4 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 9e 4a 0b fa e8 29 RSP: 0018:ffffffff88e07ce8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02 RAX: 1ffffffff11e65ef RBX: ffffffff88e7a1c0 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffffffff88e7aa54 RBP: ffffffff88e07d18 R08: ffffffff88e7a1c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffffff89c76a00 R14: 0000000000000000 R15: 0000000000000000 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:571 default_idle_call+0x84/0xb0 kernel/sched/idle.c:94 cpuidle_idle_call kernel/sched/idle.c:154 [inline] do_idle+0x3b7/0x6e0 kernel/sched/idle.c:263 cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:355 rest_init+0x245/0x37b init/main.c:451 arch_call_rest_init+0xe/0x1b start_kernel+0x904/0x943 init/main.c:784 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:490 x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:471 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241