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-executor0:1530 blocked for more than 140 seconds.
      Not tainted 4.9.118-g856452b #21
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D27912  1530   3886 0x00000004
 ffff8801d8df4800 ffff8801d7905500 ffff8801cb17af40 ffff8801d8df6000
 ffff8801db321c18 ffff8801ccf1f808 ffffffff839ebbad ffff8801ccf1f828
 ffff880194530728 0000000000000000 0000000000000000 ffff8801db3224e8
Call Trace:
 [<ffffffff839ed1af>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff839f87e8>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff839f87e8>] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81ee8e67>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff839f65bc>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff839f65bc>] down_write+0x5c/0xa0 kernel/locking/rwsem.c:54
 [<ffffffff815a5145>] inode_lock include/linux/fs.h:766 [inline]
 [<ffffffff815a5145>] do_last fs/namei.c:3312 [inline]
 [<ffffffff815a5145>] path_openat+0xed5/0x3590 fs/namei.c:3534
 [<ffffffff815abac7>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156e29d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8156e5f7>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8156e5f7>] SyS_open fs/open.c:1085 [inline]
 [<ffffffff8156e5f7>] SYSC_creat fs/open.c:1110 [inline]
 [<ffffffff8156e5f7>] SyS_creat+0x27/0x30 fs/open.c:1108
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fca93>] 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: [<ffffffff8136679c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136679c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425fb7>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3772:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839fac52>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff821207a2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
2 locks held by syz-executor0/1530:
 #0:  (sb_writers#12){.+.+.+}, at: [<ffffffff815e0ddf>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#12){.+.+.+}, at: [<ffffffff815e0ddf>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#17){++++++}, at: [<ffffffff815a5145>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#17){++++++}, at: [<ffffffff815a5145>] do_last fs/namei.c:3312 [inline]
 #1:  (&sb->s_type->i_mutex_key#17){++++++}, at: [<ffffffff815a5145>] path_openat+0xed5/0x3590 fs/namei.c:3534

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.118-g856452b #21
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d84cfd08 ffffffff81eb4b89 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b9bd0 ffff8801d84cfd40
 ffffffff81ebfe87 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb4b89>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb4b89>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebfe87>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebfe1a>] 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
 [<ffffffff81366d34>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366d34>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366d34>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366d34>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d0ed>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fcc5c>] 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: 1527 Comm: syz-executor0 Not tainted 4.9.118-g856452b #21
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801cea59800 task.stack: ffff8801b6cc0000
RIP: 0010:[<ffffffff8135eab4>] 
c [<ffffffff8135eab4>] __sanitizer_cov_trace_pc+0x4/0x50 kernel/kcov.c:93
RSP: 0018:ffff8801b6cc69d8  EFLAGS: 00000297
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81ec46cc RDI: ffff8801cbff0390
RBP: ffff8801b6cc69d8 R08: ffff8801cea5a188 R09: 0000000000000001
R10: ffff8801cea59800 R11: 1ffff10039d4b42c R12: ffff8801d62e2100
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8801d62e2128
FS:  00007f7d1ee44700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffea161efe0 CR3: 00000001b8f3a000 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Stack:
 ffff8801b6cc6a48
c ffffffff81ec4733
c ffff8801cbff0398
c ffff8801b6cc6a78
c
 0000000000000000
c ffffed00397fe073
c ffff8801cbff0390
c 0000000000000041
c
 0000000000000001
c 1ffff10036d98d4b
c ffff8801cbff0390
c 0000000000000041
c
Call Trace:
 [<ffffffff81ec4733>] __radix_tree_lookup+0x133/0x2f0 lib/radix-tree.c:691
 [<ffffffff81ec4962>] radix_tree_lookup_slot+0x72/0xc0 lib/radix-tree.c:725
 [<ffffffff81438e9e>] find_get_entry+0x8e/0x540 mm/filemap.c:1093
 [<ffffffff8143a28b>] pagecache_get_page+0x4b/0x720 mm/filemap.c:1201
 [<ffffffff81624332>] find_get_page_flags include/linux/pagemap.h:264 [inline]
 [<ffffffff81624332>] __find_get_block_slow+0xc2/0x330 fs/buffer.c:212
 [<ffffffff816248de>] __find_get_block+0x23e/0x4c0 fs/buffer.c:1360
 [<ffffffff816256e9>] __getblk_slow fs/buffer.c:1101 [inline]
 [<ffffffff816256e9>] __getblk_gfp+0x189/0x710 fs/buffer.c:1386
 [<ffffffff8162908d>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818c51a0>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818c51a0>] fat_ent_bread+0x160/0x2f0 fs/fat/fatent.c:106
 [<ffffffff818c6e9b>] fat_ent_read_block fs/fat/fatent.c:441 [inline]
 [<ffffffff818c6e9b>] fat_alloc_clusters+0x51b/0xe10 fs/fat/fatent.c:489
 [<ffffffff818b840b>] fat_add_new_entries+0x1fb/0xa80 fs/fat/dir.c:1215
 [<ffffffff818bc2a9>] fat_add_entries+0xb69/0x1180 fs/fat/dir.c:1370
 [<ffffffff818dc5b5>] vfat_add_entry+0x1a85/0x2b60 fs/fat/namei_vfat.c:687
 [<ffffffff818de845>] vfat_create+0x105/0x350 fs/fat/namei_vfat.c:792
 [<ffffffff8159c09c>] lookup_open+0x11dc/0x1930 fs/namei.c:3224
 [<ffffffff815a5168>] do_last fs/namei.c:3315 [inline]
 [<ffffffff815a5168>] path_openat+0xef8/0x3590 fs/namei.c:3534
 [<ffffffff815abac7>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156e29d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8156e5f7>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8156e5f7>] SyS_open fs/open.c:1085 [inline]
 [<ffffffff8156e5f7>] SYSC_creat fs/open.c:1110 [inline]
 [<ffffffff8156e5f7>] SyS_creat+0x27/0x30 fs/open.c:1108
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fca93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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