INFO: task syz-executor.3:12899 blocked for more than 140 seconds. Not tainted 4.14.121 #15 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D30000 12899 6833 0x00000004 Call Trace: context_switch kernel/sched/core.c:2807 [inline] __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383 schedule+0x92/0x1c0 kernel/sched/core.c:3427 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3485 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 SYSC_acct kernel/acct.c:285 [inline] SyS_acct+0x68/0x870 kernel/acct.c:273 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459279 RSP: 002b:00007fc95cbc8c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a3 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000459279 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc95cbc96d4 R13: 00000000004bf21b R14: 00000000004d0390 R15: 00000000ffffffff INFO: task syz-executor.3:12906 blocked for more than 140 seconds. Not tainted 4.14.121 #15 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29184 12906 6833 0x00000004 Call Trace: context_switch kernel/sched/core.c:2807 [inline] __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383 schedule+0x92/0x1c0 kernel/sched/core.c:3427 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3485 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 SYSC_acct kernel/acct.c:285 [inline] SyS_acct+0x68/0x870 kernel/acct.c:273 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459279 RSP: 002b:00007fc95cbc8c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a3 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000459279 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc95cbc96d4 R13: 00000000004bf21b R14: 00000000004d0390 R15: 00000000ffffffff INFO: task syz-executor.3:12908 blocked for more than 140 seconds. Not tainted 4.14.121 #15 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29920 12908 12906 0x00000004 Call Trace: context_switch kernel/sched/core.c:2807 [inline] __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383 schedule+0x92/0x1c0 kernel/sched/core.c:3427 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3485 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 SYSC_acct kernel/acct.c:285 [inline] SyS_acct+0x68/0x870 kernel/acct.c:273 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459279 RSP: 002b:00007fc95cbc8c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a3 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000459279 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc95cbc96d4 R13: 00000000004bf21b R14: 00000000004d0390 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1008: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4541 2 locks held by getty/6782: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156 2 locks held by getty/6783: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156 2 locks held by getty/6784: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156 2 locks held by getty/6785: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156 2 locks held by getty/6786: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156 2 locks held by getty/6787: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156 2 locks held by getty/6788: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.4/12898: #0: (acct_on_mutex){+.+.}, at: [] SYSC_acct kernel/acct.c:285 [inline] #0: (acct_on_mutex){+.+.}, at: [] SyS_acct+0x68/0x870 kernel/acct.c:273 1 lock held by syz-executor.3/12899: #0: (acct_on_mutex){+.+.}, at: [] SYSC_acct kernel/acct.c:285 [inline] #0: (acct_on_mutex){+.+.}, at: [] SyS_acct+0x68/0x870 kernel/acct.c:273 1 lock held by syz-executor.3/12906: #0: (acct_on_mutex){+.+.}, at: [] SYSC_acct kernel/acct.c:285 [inline] #0: (acct_on_mutex){+.+.}, at: [] SyS_acct+0x68/0x870 kernel/acct.c:273 1 lock held by syz-executor.3/12908: #0: (acct_on_mutex){+.+.}, at: [] SYSC_acct kernel/acct.c:285 [inline] #0: (acct_on_mutex){+.+.}, at: [] SyS_acct+0x68/0x870 kernel/acct.c:273 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1008 Comm: khungtaskd Not tainted 4.14.121 #15 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x138/0x19c lib/dump_stack.c:53 nmi_cpu_backtrace.cold+0x57/0x94 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x141/0x189 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:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5e7/0xb90 kernel/hung_task.c:274 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.121 #15 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffffffff87676240 task.stack: ffffffff87600000 RIP: 0010:ktime_get_with_offset+0x176/0x320 kernel/time/timekeeping.c:804 RSP: 0018:ffff8880aee06d28 EFLAGS: 00000206 RAX: 00000063abd6aaff RBX: 1ffffffff0ee29f0 RCX: 1ffffffff0eced7f RDX: 0000000000000100 RSI: ffffffff87676c00 RDI: 0000000000000206 RBP: ffff8880aee06d80 R08: ffffffff87676240 R09: ffffffff87676bf8 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: 1ffffffff0ee29f2 R14: ffffffff8779dda8 R15: 00000000000134ea FS: 0000000000000000(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c4271a3000 CR3: 0000000096633000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ktime_get_real include/linux/timekeeping.h:185 [inline] __net_timestamp include/linux/skbuff.h:3450 [inline] net_timestamp_set net/core/dev.c:1807 [inline] dev_queue_xmit_nit+0x4e7/0x8c0 net/core/dev.c:1947 xmit_one net/core/dev.c:3005 [inline] dev_hard_start_xmit+0xa7/0x8b0 net/core/dev.c:3025 sch_direct_xmit+0x27a/0x550 net/sched/sch_generic.c:186 __dev_xmit_skb net/core/dev.c:3218 [inline] __dev_queue_xmit+0x1b6e/0x25e0 net/core/dev.c:3493 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 neigh_hh_output include/net/neighbour.h:490 [inline] neigh_output include/net/neighbour.h:498 [inline] ip_finish_output2+0xddc/0x14a0 net/ipv4/ip_output.c:229 ip_finish_output+0x56d/0xc60 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip_output+0x1e6/0x590 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:459 [inline] ip_local_out+0x97/0x170 net/ipv4/ip_output.c:124 ip_queue_xmit+0x7d7/0x1b10 net/ipv4/ip_output.c:504 __tcp_transmit_skb+0x172c/0x2fe0 net/ipv4/tcp_output.c:1130 __tcp_send_ack.part.0+0x3c8/0x5b0 net/ipv4/tcp_output.c:3617 __tcp_send_ack net/ipv4/tcp_output.c:3623 [inline] tcp_send_ack+0x7a/0xa0 net/ipv4/tcp_output.c:3623 __tcp_ack_snd_check+0x107/0x3a0 net/ipv4/tcp_input.c:5125 tcp_rcv_established+0x1179/0x1650 net/ipv4/tcp_input.c:5515 tcp_v4_do_rcv+0x563/0x7e0 net/ipv4/tcp_ipv4.c:1467 tcp_v4_rcv+0x241e/0x3170 net/ipv4/tcp_ipv4.c:1741 ip_local_deliver_finish+0x25e/0xad0 net/ipv4/ip_input.c:216 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] ip_local_deliver+0x1c3/0x4a0 net/ipv4/ip_input.c:257 dst_input include/net/dst.h:465 [inline] ip_rcv_finish+0x7be/0x1a50 net/ipv4/ip_input.c:396 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] ip_rcv+0xaa5/0x112b net/ipv4/ip_input.c:493 __netif_receive_skb_core+0x1d58/0x2aa0 net/core/dev.c:4477 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4515 netif_receive_skb_internal+0xe4/0x5a0 net/core/dev.c:4588 napi_skb_finish net/core/dev.c:4949 [inline] napi_gro_receive+0x2f8/0x410 net/core/dev.c:4980 receive_buf+0x532/0x3fc0 drivers/net/virtio_net.c:852 virtnet_receive drivers/net/virtio_net.c:1098 [inline] virtnet_poll+0x515/0xa6e drivers/net/virtio_net.c:1189 napi_poll net/core/dev.c:5598 [inline] net_rx_action+0x490/0xf80 net/core/dev.c:5664 __do_softirq+0x244/0x9a0 kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x160/0x1b0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] do_IRQ+0x11b/0x1d0 arch/x86/kernel/irq.c:242 common_interrupt+0x8e/0x8e arch/x86/entry/entry_64.S:573 RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61 RSP: 0018:ffffffff87607de8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff6e RAX: 1ffffffff0ee29f4 RBX: ffffffff87676240 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff87676abc RBP: ffffffff87607e10 R08: 1ffffffff1049d01 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff87714f90 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff87676240 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:557 default_idle_call+0x36/0x90 kernel/sched/idle.c:98 cpuidle_idle_call kernel/sched/idle.c:156 [inline] do_idle+0x262/0x3d0 kernel/sched/idle.c:246 cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:351 rest_init+0xf1/0xf6 init/main.c:435 start_kernel+0x6df/0x6fd init/main.c:709 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:380 x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:361 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240 Code: 89 ff 57 9d 0f 1f 44 00 00 e8 17 3f 0c 00 44 8b 3d 90 78 29 06 41 f6 c7 01 0f 85 07 01 00 00 e8 01 3f 0c 00 48 8b 05 ca 78 29 06 <48> 89 45 c8 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 0f 85 53 01 00