pktgen: kernel_thread() failed for cpu 0
pktgen: Cannot create thread for cpu 0 (-4)
pktgen: kernel_thread() failed for cpu 1
pktgen: Cannot create thread for cpu 1 (-4)
pktgen: Initialization failed for all threads
INFO: task syz-executor5:11039 blocked for more than 120 seconds.
      Not tainted 4.9.109-ge1815b3 #3
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5   D27976 11039   3820 0x20020004
 ffff88019964e000 ffff8801da1fdf80 ffff88019b7c0fc0 ffff8801d8684800
 ffff8801db321c18 ffff8801d81ef310 ffffffff839e8a8d 1ffff1003b03de56
 ffffffff85542200 0000000041b58ab3 00ffffff843c2288 ffff8801db3224e8
Call Trace:
 [<ffffffff839ea08f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f64a1>] schedule_timeout+0x861/0xf70 kernel/time/timer.c:1768
 [<ffffffff839e826a>] io_schedule_timeout+0x1ba/0x390 kernel/sched/core.c:5180
 [<ffffffff8164308b>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff8164308b>] dio_await_one fs/direct-io.c:461 [inline]
 [<ffffffff8164308b>] dio_await_completion fs/direct-io.c:515 [inline]
 [<ffffffff8164308b>] do_blockdev_direct_IO+0x2d5b/0x5a80 fs/direct-io.c:1331
 [<ffffffff81645e55>] __blockdev_direct_IO+0xa5/0xd0 fs/direct-io.c:1360
 [<ffffffff8162fa00>] blkdev_direct_IO+0xa0/0xd0 fs/block_dev.c:183
 [<ffffffff8143e740>] generic_file_read_iter+0x660/0x1a90 mm/filemap.c:1951
 [<ffffffff81632605>] blkdev_read_iter+0x105/0x170 fs/block_dev.c:1738
 [<ffffffff81615009>] generic_file_splice_read+0x2c9/0x4f0 fs/splice.c:309
 [<ffffffff8161375c>] do_splice_to+0x10c/0x170 fs/splice.c:899
 [<ffffffff816139ff>] splice_direct_to_actor+0x23f/0x7e0 fs/splice.c:971
 [<ffffffff81614143>] do_splice_direct+0x1a3/0x270 fs/splice.c:1080
 [<ffffffff81575530>] do_sendfile+0x4f0/0xc60 fs/read_write.c:1393
 [<ffffffff81577711>] C_SYSC_sendfile fs/read_write.c:1469 [inline]
 [<ffffffff81577711>] compat_SyS_sendfile+0xd1/0x160 fs/read_write.c:1458
 [<ffffffff81006da7>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870 arch/x86/entry/common.c:387
 [<ffffffff839fb090>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137

Showing all locks held in the system:
2 locks held by khungtaskd/520:
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136662c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136662c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425cb7>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3664:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d803c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3761:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f7b32>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff8211fce2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 520 Comm: khungtaskd Not tainted 4.9.109-ge1815b3 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d862fd08 ffffffff81eb3e29 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9580 ffff8801d862fd40
 ffffffff81ebf127 0000000000000001 0000000000000000 0000000000000002
Call Trace:
 [<ffffffff81eb3e29>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb3e29>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebf127>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebf0ba>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b9684>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81366bc4>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366bc4>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366bc4>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366bc4>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d04d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f9b5c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11142 Comm: init Not tainted 4.9.109-ge1815b3 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801ceddb000 task.stack: ffff8801b9da0000
RIP: 0010:[<ffffffff8215063b>] 
c [<ffffffff8215063b>] inb arch/x86/include/asm/io.h:316 [inline]
RIP: 0010:[<ffffffff8215063b>] 
c [<ffffffff8215063b>] io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:414
RSP: 0018:ffff8801b9da7520  EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: ffffffff821505e1 RDI: ffffffff864aae78
RBP: ffff8801b9da7530 R08: ffff8801ceddb938 R09: 0000000000000001
R10: ffff8801ceddb000 R11: 1ffff10039dbb722 R12: ffffffff864aae40
R13: 0000000000000020 R14: fffffbfff0c9560f R15: fffffbfff0c955d1
FS:  00007f608f3127a0(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f608ea25a30 CR3: 00000001acc1a000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff864aae40
c 000000000000270e
c ffff8801b9da7580
c ffffffff82152204
c
 ffff8801b9da75b8
c ffffffff864aae88
c ffffffff864ab07a
c ffffffff864aae40
c
 0000000000000020
c ffffffff82152350
c dffffc0000000000
c 0000000000000020
c
Call Trace:
 [<ffffffff82152204>] serial_in drivers/tty/serial/8250/8250.h:111 [inline]
 [<ffffffff82152204>] wait_for_xmitr+0x94/0x1e0 drivers/tty/serial/8250/8250_port.c:1998
 [<ffffffff8215236f>] serial8250_console_putchar+0x1f/0x60 drivers/tty/serial/8250/8250_port.c:3104
 [<ffffffff8213ab99>] uart_console_write+0x59/0xf0 drivers/tty/serial/serial_core.c:1859
 [<ffffffff8215e588>] serial8250_console_write+0x528/0x820 drivers/tty/serial/8250/8250_port.c:3170
 [<ffffffff8214b0ef>] univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:594
 [<ffffffff8125bc5d>] call_console_drivers.isra.18.constprop.28+0x1ad/0x360 kernel/printk/printk.c:1589
 [<ffffffff8125ea5f>] console_unlock+0x42f/0xb40 kernel/printk/printk.c:2449
 [<ffffffff8125fea7>] console_device+0x97/0xc0 kernel/printk/printk.c:2557
 [<ffffffff8211a03a>] tty_lookup_driver drivers/tty/tty_io.c:2003 [inline]
 [<ffffffff8211a03a>] tty_open_by_driver drivers/tty/tty_io.c:2048 [inline]
 [<ffffffff8211a03a>] tty_open+0x71a/0xe20 drivers/tty/tty_io.c:2125
 [<ffffffff8157ed1d>] chrdev_open+0x22d/0x4c0 fs/char_dev.c:392
 [<ffffffff81569c03>] do_dentry_open+0x703/0xc80 fs/open.c:766
 [<ffffffff8156d3ec>] vfs_open+0x11c/0x210 fs/open.c:879
 [<ffffffff815a4528>] do_last fs/namei.c:3410 [inline]
 [<ffffffff815a4528>] path_openat+0x758/0x3590 fs/namei.c:3534
 [<ffffffff815ab627>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156ddfd>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8156e0dd>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8156e0dd>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9993>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
c24 
cc9 
c00 
c00 
c00 
c49 
c8d 
c7c 
c24 
c38 
c48 
cb8 
c00 
c00 
c00 
c00 
c00 
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c48 
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c48 
cc1 
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c03 
cd3 
ce3 
c80 
c3c 
c02 
c00 
c75 
c17 
c41 
c03 
c5c 
c24 
c38 
c89 
cda 
cec 
c<5b> 
c0f 
cb6 
cc0 
c41 
c5c 
c5d 
cc3 
ce8 
c28 
cb4 
c3e 
cff 
ceb 
cc2 
ce8 
c81 
cb4 
c3e 
cff 
ceb 
c