pktgen: Cannot create thread for cpu 1 (-4)
pktgen: Initialization failed for all threads
INFO: task syz-executor5:22996 blocked for more than 140 seconds.
      Not tainted 4.9.117-g8b21e85 #19
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5   D27976 22996  15635 0x00000004
 ffff8801ca764800 0000000000000000 ffff88019d718a80 ffff88019dd28000
 ffff8801db221c18 ffff88019ceff660 ffffffff839ebd0d dffffc0000000000
 ffff8801d63c99d0 ffff88019ceff620 00ff8801ca7650c0 ffff8801db2224e8
Call Trace:
 [<ffffffff839ed30f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff815c8102>] d_wait_lookup fs/dcache.c:2455 [inline]
 [<ffffffff815c8102>] d_alloc_parallel+0xeb2/0x17c0 fs/dcache.c:2537
 [<ffffffff815950bc>] lookup_slow+0x19c/0x470 fs/namei.c:1650
 [<ffffffff815a16e6>] walk_component+0x716/0x1bb0 fs/namei.c:1784
 [<ffffffff815a4046>] lookup_last fs/namei.c:2266 [inline]
 [<ffffffff815a4046>] path_lookupat.isra.41+0x186/0x410 fs/namei.c:2283
 [<ffffffff815a9af7>] filename_lookup.part.55+0x177/0x370 fs/namei.c:2317
 [<ffffffff815a9eb3>] filename_lookup fs/namei.c:2310 [inline]
 [<ffffffff815a9eb3>] user_path_at_empty+0x53/0x70 fs/namei.c:2578
 [<ffffffff8161c16f>] user_path_at include/linux/namei.h:55 [inline]
 [<ffffffff8161c16f>] do_utimes+0x17f/0x2c0 fs/utimes.c:155
 [<ffffffff8161c84d>] SYSC_futimesat fs/utimes.c:214 [inline]
 [<ffffffff8161c84d>] SyS_futimesat fs/utimes.c:189 [inline]
 [<ffffffff8161c84d>] SYSC_utimes fs/utimes.c:220 [inline]
 [<ffffffff8161c84d>] SyS_utimes+0x13d/0x1b0 fs/utimes.c:217
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fcc13>] 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: [<ffffffff813667fc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813667fc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81426017>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by rs:main Q:Reg/3675:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d859c>] __fdget_pos+0xac/0xd0 fs/file.c:781
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff8157307e>] file_start_write include/linux/fs.h:2640 [inline]
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff8157307e>] vfs_write+0x3ae/0x530 fs/read_write.c:556
2 locks held by getty/3773:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839fadb2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff821207f2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor5/22911:
 #0:  (&sb->s_type->i_mutex_key#23){++++++}, at: [<ffffffff81595061>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&sb->s_type->i_mutex_key#23){++++++}, at: [<ffffffff81595061>] lookup_slow+0x141/0x470 fs/namei.c:1645
1 lock held by syz-executor5/22996:
 #0:  (&sb->s_type->i_mutex_key#23){++++++}, at: [<ffffffff81595061>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&sb->s_type->i_mutex_key#23){++++++}, at: [<ffffffff81595061>] lookup_slow+0x141/0x470 fs/namei.c:1645

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.117-g8b21e85 #19
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d84efd08 ffffffff81eb4be9 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b9bd0 ffff8801d84efd40
 ffffffff81ebfee7 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb4be9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb4be9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebfee7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebfe7a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b9cd4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81366d94>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366d94>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366d94>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366d94>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d0ed>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fcddc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.117-g8b21e85 #19
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9a6b000 task.stack: ffff8801d9a80000
RIP: 0010:[<ffffffff811ff2a7>] 
c [<ffffffff811ff2a7>] update_sd_lb_stats+0x1227/0x3a20 kernel/sched/fair.c:8857
RSP: 0018:ffff8801db307900  EFLAGS: 00000286
RAX: ffffed003b660f3a RBX: ffff8801da022a80 RCX: ffff8801db307b08
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff8801da022aa9
RBP: ffff8801db307a98 R08: 000000000000078b R09: 0000000000000d1d
R10: ffff8801db307a10 R11: 0000000000000001 R12: ffff8801db321c00
R13: 000000000000000c R14: ffff8801db307b08 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f42ca0f5000 CR3: 00000001b8106000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d0ab9c00
c ffff8801d433e840
c ffff8801d40d2f30
c ffff8801db307938
c
 ffffffff81e13da9
c 1ffff1003b660f3a
c ffff8801d433e840
c 00000000db307950
c
 ffff8801db307b20
c ffff8801db307b18
c ffff8801db307d28
c fffffbfff08c1200
c
Call Trace:
 [<ffffffff81201b30>] find_busiest_group+0x90/0x12e0 kernel/sched/fair.c:9188
 [<ffffffff81203120>] load_balance+0x3a0/0x2fa0 kernel/sched/fair.c:9474
 [<ffffffff8120820e>] rebalance_domains+0x6be/0xbc0 kernel/sched/fair.c:10115
 [<ffffffff81208a09>] run_rebalance_domains+0x2f9/0x510 kernel/sched/fair.c:10333
 [<ffffffff83a037fb>] __do_softirq+0x20b/0x937 kernel/softirq.c:284
 [<ffffffff8114b277>] invoke_softirq kernel/softirq.c:364 [inline]
 [<ffffffff8114b277>] irq_exit+0x147/0x190 kernel/softirq.c:405
 [<ffffffff83a013a1>] smp_reschedule_interrupt+0x71/0x90 arch/x86/kernel/smp.c:270
 [<ffffffff839fef10>] reschedule_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:671
 <EOI> 
d [<ffffffff839fb816>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
 [<ffffffff839fae55>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff839fae55>] default_idle+0x55/0x360 arch/x86/kernel/process.c:437
 [<ffffffff8106ae20>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:428
 [<ffffffff839fbc75>] default_idle_call+0x45/0x60 kernel/sched/idle.c:97
 [<ffffffff81223215>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff81223215>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff81223215>] cpu_startup_entry+0x2b5/0x380 kernel/sched/idle.c:303
 [<ffffffff810aefa8>] start_secondary+0x328/0x400 arch/x86/kernel/smpboot.c:257
Code: 
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c<c7> 
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c