pktgen: Cannot create thread for cpu 1 (-4)
pktgen: Initialization failed for all threads
INFO: task syz-executor0:11246 blocked for more than 120 seconds.
      Not tainted 4.9.109-ge1815b3 #49
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D28824 11246   3839 0x00000004
 ffff8801d68b4800 ffff8801c4440fc0 ffff8801d321aa00 ffff8801d68b3000
 ffff8801db321c18 ffff880188d87ac8 ffffffff839e8a8d ffffffff812355f7
 0000000000000000 ffff8801d68b50c0 0000000600000007 ffff8801db3224e8
Call Trace:
 [<ffffffff839ea08f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f56c8>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff839f56c8>] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81ee8107>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff8122c220>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff8122c220>] down_write_nested+0x60/0xa0 kernel/locking/rwsem.c:174
 [<ffffffff815a9eca>] inode_lock_nested include/linux/fs.h:801 [inline]
 [<ffffffff815a9eca>] filename_create+0x17a/0x490 fs/namei.c:3639
 [<ffffffff815ac5a1>] user_path_create fs/namei.c:3697 [inline]
 [<ffffffff815ac5a1>] SYSC_mkdirat fs/namei.c:3841 [inline]
 [<ffffffff815ac5a1>] SyS_mkdirat fs/namei.c:3833 [inline]
 [<ffffffff815ac5a1>] SYSC_mkdir fs/namei.c:3860 [inline]
 [<ffffffff815ac5a1>] SyS_mkdir+0xb1/0x260 fs/namei.c:3858
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9993>] 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: [<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
2 locks held by getty/3779:
 #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
2 locks held by syz-executor0/11246:
 #0:  (sb_writers#15){.+.+.+}, at: [<ffffffff815e08df>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#15){.+.+.+}, at: [<ffffffff815e08df>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#20/1){+.+.+.}, at: [<ffffffff815a9eca>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&sb->s_type->i_mutex_key#20/1){+.+.+.}, at: [<ffffffff815a9eca>] filename_create+0x17a/0x490 fs/namei.c:3639

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.109-ge1815b3 #49
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d869fd08 ffffffff81eb3e29 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9580 ffff8801d869fd40
 ffffffff81ebf127 0000000000000001 0000000000000000 0000000000000003
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: 11175 Comm: syz-executor0 Not tainted 4.9.109-ge1815b3 #49
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d6890000 task.stack: ffff8801b6d50000
RIP: 0010:[<ffffffff81f1b85f>] 
c [<ffffffff81f1b85f>] check_preemption_disabled+0xf/0x170 lib/smp_processor_id.c:12
RSP: 0018:ffff8801b6d57670  EFLAGS: 00000046
RAX: 0000000000040000 RBX: ffffffff83cce760 RCX: ffffc9000090d000
RDX: 0000000000040000 RSI: ffffffff83cce760 RDI: ffffffff83e2da20
RBP: ffff8801b6d57690 R08: ffff8801d6890960 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff1003ad12127 R12: ffff8801cbc9e930
R13: ffffffff83cce760 R14: ffff8801cbc9e930 R15: 0000000000000002
FS:  00007fef0ce85700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe291d69000 CR3: 0000000184771000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801cbc9e930
c dffffc0000000000
c ffff8801cbc9e930
c 0000000000000002
c
 ffff8801b6d576a8
c ffffffff81f1b9fc
c 0000000000000002
c ffff8801b6d576f8
c
 ffffffff81624215
c 0000020007235740
c 0000000000000041
c ffff8801b6400000
c
Call Trace:
 [<ffffffff81f1b9fc>] __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
 [<ffffffff81624215>] lookup_bh_lru fs/buffer.c:1327 [inline]
 [<ffffffff81624215>] __find_get_block+0x75/0x4c0 fs/buffer.c:1356
 [<ffffffff816251e9>] __getblk_slow fs/buffer.c:1101 [inline]
 [<ffffffff816251e9>] __getblk_gfp+0x189/0x710 fs/buffer.c:1386
 [<ffffffff81628b8d>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818b6db8>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818b6db8>] fat__get_entry+0x4c8/0x8f0 fs/fat/dir.c:100
 [<ffffffff818bebb7>] fat_get_entry fs/fat/dir.c:128 [inline]
 [<ffffffff818bebb7>] fat_search_long+0x277/0x1180 fs/fat/dir.c:477
 [<ffffffff818d9044>] vfat_find+0x134/0x180 fs/fat/namei_vfat.c:708
 [<ffffffff818d9821>] vfat_lookup+0xe1/0x530 fs/fat/namei_vfat.c:731
 [<ffffffff81593cfc>] lookup_real fs/namei.c:1522 [inline]
 [<ffffffff81593cfc>] __lookup_hash+0x11c/0x190 fs/namei.c:1542
 [<ffffffff815a9ef6>] filename_create+0x1a6/0x490 fs/namei.c:3640
 [<ffffffff815ac5a1>] user_path_create fs/namei.c:3697 [inline]
 [<ffffffff815ac5a1>] SYSC_mkdirat fs/namei.c:3841 [inline]
 [<ffffffff815ac5a1>] SyS_mkdirat fs/namei.c:3833 [inline]
 [<ffffffff815ac5a1>] SYSC_mkdir fs/namei.c:3860 [inline]
 [<ffffffff815ac5a1>] SyS_mkdir+0xb1/0x260 fs/namei.c:3858
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9993>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
c8d 
cd8 
cfe 
cff 
cff 
c48 
c8b 
c85 
ce0 
cfe 
cff 
cff 
ce9 
ce0 
cf3 
cff 
cff 
c66 
c2e 
c0f 
c1f 
c84 
c00 
c00 
c00 
c00 
c00 
c90 
c55 
c48 
c89 
ce5 
c41 
c57 
c41 
c56 
c41 
c55 
c49 
c89 
cf5 
c41 
c54 
c<49> 
c89 
cfc 
c53 
c48 
c83 
cec 
c08 
ce8 
cd4 
c30 
c44 
cff 
c65 
c8b 
c1d 
cb5 
ca8 
c0f 
c7e 
c65 
c