pktgen: Cannot create thread for cpu 1 (-4)
pktgen: Initialization failed for all threads
INFO: task syz-executor0:10401 blocked for more than 120 seconds.
      Not tainted 4.9.101-gaef17a5 #29
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D29088 10401   3876 0x00000004
 ffff8801d4e20000 0000000000000000 ffff8801be6a8fc0 ffff8801d9a6b000
 ffff8801db321b98 ffff8801cf857ce8 ffffffff839e39bd ffff8801d4e208c8
 ffffed003a9c4118 ffff8801d4e20000 00fffc0000000000 ffff8801db322468
Call Trace:
 [<ffffffff839e4fbf>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839e5943>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3590
 [<ffffffff839e9dc6>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff839e9dc6>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff815d57ac>] __fdget_pos+0xac/0xd0 fs/file.c:781
 [<ffffffff815740be>] fdget_pos include/linux/file.h:66 [inline]
 [<ffffffff815740be>] SYSC_write fs/read_write.c:599 [inline]
 [<ffffffff815740be>] SyS_write+0x7e/0x1c0 fs/read_write.c:596
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f4893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/519:
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136477c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136477c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81423c90>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3769:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f2a62>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff8211cd32>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor0/10401:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d57ac>] __fdget_pos+0xac/0xd0 fs/file.c:781

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.101-gaef17a5 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8657d08 ffffffff81eb1009 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b7da0 ffff8801d8657d40
 ffffffff81ebc307 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb1009>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb1009>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebc307>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebc29a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b7ea4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81364d14>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81364d14>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81364d14>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81364d14>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119ad9d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f4a5c>] 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: 10387 Comm: syz-executor0 Not tainted 4.9.101-gaef17a5 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d3a8b000 task.stack: ffff8801d07a0000
RIP: 0010:[<ffffffff81238ee3>] 
c [<ffffffff81238ee3>] arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline]
RIP: 0010:[<ffffffff81238ee3>] 
c [<ffffffff81238ee3>] lock_acquire+0x173/0x3e0 kernel/locking/lockdep.c:3759
RSP: 0018:ffff8801db207a00  EFLAGS: 00000046
RAX: 0000000000000007 RBX: 0000000000000046 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8801d3a8b990 RDI: 0000000000000046
RBP: ffff8801db207a68 R08: ffff8801d3a8b9b0 R09: 0000000000000001
R10: ffff8801d3a8b000 R11: 1ffff1003a751731 R12: ffff8801d3a8b000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
FS:  00007fbdc807a700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd7b532d000 CR3: 00000001cda61000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000000
c ffffffff81413770
c ffff880100000000
c 0000000000000000
c
 ffff8801b5c3ee80
c ffffffff814138ba
c 0000000000000000
c 00000000d3a8b000
c
 1ffff1003b640f51
c ffff8801db207b48
c ffff8801b5c3ee80
c 0000000000000000
c
Call Trace:
 [<ffffffff8141382a>] rcu_lock_acquire include/linux/rcupdate.h:493 [inline]
 [<ffffffff8141382a>] rcu_read_lock include/linux/rcupdate.h:875 [inline]
 [<ffffffff8141382a>] __perf_event_output kernel/events/core.c:6057 [inline]
 [<ffffffff8141382a>] perf_event_output_forward+0xba/0x230 kernel/events/core.c:6077
 [<ffffffff813f5c3f>] __perf_event_overflow+0x11f/0x320 kernel/events/core.c:7177
 [<ffffffff813f780d>] perf_swevent_hrtimer+0x21d/0x360 kernel/events/core.c:8368
 [<ffffffff812a2765>] __run_hrtimer kernel/time/hrtimer.c:1255 [inline]
 [<ffffffff812a2765>] __hrtimer_run_queues+0x375/0xe50 kernel/time/hrtimer.c:1319
 [<ffffffff812a3ca1>] hrtimer_interrupt+0x1b1/0x430 kernel/time/hrtimer.c:1353
 [<ffffffff810b0594>] local_apic_timer_interrupt+0x74/0xa0 arch/x86/kernel/apic/apic.c:935
 [<ffffffff839fa05c>] smp_apic_timer_interrupt+0x7c/0xa0 arch/x86/kernel/apic/apic.c:959
 [<ffffffff839f61f0>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:648
 <EOI> 
d [<ffffffff81ec0b4c>] ? entry_to_node include/linux/radix-tree.h:451 [inline]
 <EOI> 
d [<ffffffff81ec0b4c>] ? __radix_tree_lookup+0xcc/0x2f0 lib/radix-tree.c:696
 [<ffffffff81ec0de2>] radix_tree_lookup_slot+0x72/0xc0 lib/radix-tree.c:725
 [<ffffffff81436b0e>] find_get_entry+0x8e/0x540 mm/filemap.c:1095
 [<ffffffff81437efb>] pagecache_get_page+0x4b/0x720 mm/filemap.c:1203
 [<ffffffff81622a19>] find_or_create_page include/linux/pagemap.h:309 [inline]
 [<ffffffff81622a19>] grow_dev_page fs/buffer.c:1005 [inline]
 [<ffffffff81622a19>] grow_buffers fs/buffer.c:1078 [inline]
 [<ffffffff81622a19>] __getblk_slow fs/buffer.c:1105 [inline]
 [<ffffffff81622a19>] __getblk_gfp+0x249/0x710 fs/buffer.c:1386
 [<ffffffff816262fd>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818c12e1>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818c12e1>] fat12_ent_bread+0x231/0x400 fs/fat/fatent.c:84
 [<ffffffff818c367b>] fat_ent_read_block fs/fat/fatent.c:441 [inline]
 [<ffffffff818c367b>] fat_alloc_clusters+0x51b/0xe10 fs/fat/fatent.c:489
 [<ffffffff818d084f>] fat_add_cluster+0x6f/0xe0 fs/fat/inode.c:100
 [<ffffffff818d0b9f>] __fat_get_block fs/fat/inode.c:147 [inline]
 [<ffffffff818d0b9f>] fat_get_block+0x2df/0x800 fs/fat/inode.c:176
 [<ffffffff81627541>] __block_write_begin_int+0x391/0x1040 fs/buffer.c:1987
 [<ffffffff8162828f>] __block_write_begin fs/buffer.c:2038 [inline]
 [<ffffffff8162828f>] block_write_begin+0x5f/0x180 fs/buffer.c:2097
 [<ffffffff816288a3>] cont_write_begin+0x4f3/0x810 fs/buffer.c:2450
 [<ffffffff818ccd0a>] fat_write_begin+0x9a/0x120 fs/fat/inode.c:222
 [<ffffffff81433c61>] generic_perform_write+0x301/0x510 mm/filemap.c:2740
 [<ffffffff8143b63a>] __generic_file_write_iter+0x29a/0x540 mm/filemap.c:2833
 [<ffffffff8143bbc0>] generic_file_write_iter+0x2e0/0x610 mm/filemap.c:2893
 [<ffffffff8156c4f0>] new_sync_write fs/read_write.c:496 [inline]
 [<ffffffff8156c4f0>] __vfs_write+0x3e0/0x580 fs/read_write.c:509
 [<ffffffff815702e7>] vfs_write+0x187/0x530 fs/read_write.c:557
 [<ffffffff81574119>] SYSC_write fs/read_write.c:604 [inline]
 [<ffffffff81574119>] SyS_write+0xd9/0x1c0 fs/read_write.c:596
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f4893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c