pktgen: Cannot create thread for cpu 1 (-4)
pktgen: Initialization failed for all threads
INFO: task syz-executor0:9356 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  9356   3831 0x00000004
 ffff8801b730c800 0000000000000000 ffff8801d088ef40 ffff8801d9a6b000
 ffff8801db321c18 ffff8801b7347ce8 ffffffff839e8a8d ffff8801b730d0c8
 ffffed0036e61a18 ffff8801b730c800 00fffc0000000000 ffff8801db3224e8
Call Trace:
 [<ffffffff839ea08f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839eaa13>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3590
 [<ffffffff839eee96>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff839eee96>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff815d803c>] __fdget_pos+0xac/0xd0 fs/file.c:781
 [<ffffffff8157672e>] fdget_pos include/linux/file.h:66 [inline]
 [<ffffffff8157672e>] SYSC_write fs/read_write.c:599 [inline]
 [<ffffffff8157672e>] SyS_write+0x7e/0x1c0 fs/read_write.c:596
 [<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/3777:
 #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
1 lock held by syz-executor0/9356:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d803c>] __fdget_pos+0xac/0xd0 fs/file.c:781

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

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
 ffff8801d8b0fd08 ffffffff81eb3e29 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9580 ffff8801d8b0fd40
 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: 9284 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: ffff8801b7423000 task.stack: ffff8801bb3d0000
RIP: 0010:[<ffffffff8135e940>] 
c [<ffffffff8135e940>] __sanitizer_cov_trace_pc+0x0/0x50
RSP: 0018:ffff8801bb3d6f70  EFLAGS: 00000296
RAX: 0000000000040000 RBX: ffff8801d9c16b08 RCX: ffffc900008d1000
RDX: 0000000000040000 RSI: ffffffff83e2d9a0 RDI: ffffffff83e2d9e0
RBP: ffff8801bb3d6fa8 R08: ffff8801b7423988 R09: 0000000000000001
R10: ffff8801b7423000 R11: 1ffff10036e8472c R12: ffffffff83e2d9e0
R13: ffffffff83e2d9a0 R14: 0000000000000000 R15: ffff8801d9c16b08
FS:  00007fda42b04700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002524000 CR3: 00000001cc5fd000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff81f1b86c
c ffffffff81438ab0
c ffff8801d9c16b08
c 0000000000000001
c
 dffffc0000000000
c 0000000000000000
c ffff8801d9c16b08
c ffff8801bb3d6fb8
c
 ffffffff81f1b9dc
c ffff8801bb3d6fd8
c ffffffff8127f515
c ffff8801bb3d6fd8
c
Call Trace:
 [<ffffffff81f1b9dc>] debug_smp_processor_id+0x1c/0x20 lib/smp_processor_id.c:56
 [<ffffffff8127f515>] __rcu_is_watching kernel/rcu/tree.c:1053 [inline]
 [<ffffffff8127f515>] rcu_is_watching+0x15/0xa0 kernel/rcu/tree.c:1067
 [<ffffffff81438e5e>] rcu_read_lock include/linux/rcupdate.h:876 [inline]
 [<ffffffff81438e5e>] find_get_entry+0x3ae/0x540 mm/filemap.c:1092
 [<ffffffff81439f2b>] pagecache_get_page+0x4b/0x720 mm/filemap.c:1203
 [<ffffffff81623e32>] find_get_page_flags include/linux/pagemap.h:264 [inline]
 [<ffffffff81623e32>] __find_get_block_slow+0xc2/0x330 fs/buffer.c:212
 [<ffffffff816243de>] __find_get_block+0x23e/0x4c0 fs/buffer.c:1360
 [<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
 [<ffffffff818c4011>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818c4011>] fat12_ent_bread+0x231/0x400 fs/fat/fatent.c:84
 [<ffffffff818c63ab>] fat_ent_read_block fs/fat/fatent.c:441 [inline]
 [<ffffffff818c63ab>] fat_alloc_clusters+0x51b/0xe10 fs/fat/fatent.c:489
 [<ffffffff818d357f>] fat_add_cluster+0x6f/0xe0 fs/fat/inode.c:100
 [<ffffffff818d38cf>] __fat_get_block fs/fat/inode.c:147 [inline]
 [<ffffffff818d38cf>] fat_get_block+0x2df/0x800 fs/fat/inode.c:176
 [<ffffffff81629dd1>] __block_write_begin_int+0x391/0x1040 fs/buffer.c:1987
 [<ffffffff8162ab1f>] __block_write_begin fs/buffer.c:2038 [inline]
 [<ffffffff8162ab1f>] block_write_begin+0x5f/0x180 fs/buffer.c:2097
 [<ffffffff8162b133>] cont_write_begin+0x4f3/0x810 fs/buffer.c:2450
 [<ffffffff818cfa3a>] fat_write_begin+0x9a/0x120 fs/fat/inode.c:222
 [<ffffffff81435c91>] generic_perform_write+0x301/0x510 mm/filemap.c:2740
 [<ffffffff8143d66a>] __generic_file_write_iter+0x29a/0x540 mm/filemap.c:2833
 [<ffffffff8143dbf0>] generic_file_write_iter+0x2e0/0x610 mm/filemap.c:2893
 [<ffffffff8156eb60>] new_sync_write fs/read_write.c:496 [inline]
 [<ffffffff8156eb60>] __vfs_write+0x3e0/0x580 fs/read_write.c:509
 [<ffffffff81572957>] vfs_write+0x187/0x530 fs/read_write.c:557
 [<ffffffff81576789>] SYSC_write fs/read_write.c:604 [inline]
 [<ffffffff81576789>] SyS_write+0xd9/0x1c0 fs/read_write.c:596
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9993>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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