INFO: task syz-executor171:9003 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-executor171 D28056 9003 9001 0x00000000 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x8e1/0x1f30 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 __lock_sock+0x165/0x290 net/core/sock.c:2413 lock_sock_nested+0xfe/0x120 net/core/sock.c:2938 virtio_transport_release+0xc4/0xd50 net/vmw_vsock/virtio_transport_common.c:822 vsock_assign_transport+0xea/0x330 net/vmw_vsock/af_vsock.c:437 vsock_stream_connect+0x2b3/0xc70 net/vmw_vsock/af_vsock.c:1268 __sys_connect_file+0x25d/0x2e0 net/socket.c:1847 __sys_connect+0x51/0x90 net/socket.c:1860 __do_sys_connect net/socket.c:1871 [inline] __se_sys_connect net/socket.c:1868 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1868 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4401b9 Code: Bad RIP value. RSP: 002b:00007ffc961fdf58 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401b9 RDX: 0000000000000010 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a40 R13: 0000000000401ad0 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/890: #0: ffffffff895a4080 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5334 1 lock held by rsyslogd/8889: 2 locks held by getty/8979: #0: ffff8880a0a25090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f5d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8980: #0: ffff8880a17d6090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f412e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8981: #0: ffff888091450090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f672e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8982: #0: ffff8880a711c090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f552e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8983: #0: ffff888095ad5090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f512e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8984: #0: ffff8880a363d090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f632e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8985: #0: ffff88809a3c5090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f352e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 1 lock held by syz-executor171/9003: #0: ffff8880a5ce48d0 (sk_lock-AF_VSOCK){+.+.}, at: lock_sock include/net/sock.h:1526 [inline] #0: ffff8880a5ce48d0 (sk_lock-AF_VSOCK){+.+.}, at: vsock_stream_connect+0xfb/0xc70 net/vmw_vsock/af_vsock.c:1238 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 890 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+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: 0 Comm: swapper/1 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:_nohz_idle_balance+0x95/0x3f0 kernel/sched/fair.c:9910 Code: fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 65 03 00 00 c7 05 a2 6a 22 09 00 00 00 00 48 8b 44 24 28 8b 80 c8 0a 00 00 <89> 44 24 54 f0 83 44 24 fc 00 65 48 8b 04 25 c0 1e 02 00 48 89 44 RSP: 0018:ffff8880ae909e08 EFLAGS: 00000246 RAX: 0000000000000001 RBX: ffff8880ae937380 RCX: ffffffff8155710b RDX: 1ffff11015d26fc9 RSI: 0000000000000003 RDI: ffff8880ae937e48 RBP: ffff8880ae909e88 R08: 1ffff11015d26e7c R09: ffffed1015d26e7d R10: ffffed1015d26e7c R11: ffff8880ae9373e3 R12: ffff8880ae937380 R13: ffff8880ae937e48 R14: 0000000000000001 R15: ffff8880ae9373e0 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 000000009d25f000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: nohz_idle_balance kernel/sched/fair.c:10025 [inline] run_rebalance_domains+0x1c6/0x2d0 kernel/sched/fair.c:10214 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 scheduler_ipi+0x3ae/0x640 kernel/sched/core.c:2348 smp_reschedule_interrupt+0x78/0x4c0 arch/x86/kernel/smp.c:244 reschedule_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:853 RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61 Code: e8 14 f8 f9 eb 8a cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d f4 7d 4e 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d e4 7d 4e 00 fb f4 cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 ae 78 a8 f9 e8 89 RSP: 0018:ffff8880a98dfd68 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02 RAX: 1ffffffff12a668e RBX: ffff8880a98ce340 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a98cebd4 RBP: ffff8880a98dfd98 R08: ffff8880a98ce340 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffffff8a36dd00 R14: 0000000000000000 R15: 0000000000000001 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:690 default_idle_call+0x84/0xb0 kernel/sched/idle.c:94 cpuidle_idle_call kernel/sched/idle.c:154 [inline] do_idle+0x3c8/0x6e0 kernel/sched/idle.c:269 cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:361 start_secondary+0x2f4/0x410 arch/x86/kernel/smpboot.c:264 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242