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
IPVS: stopping master sync thread 11689 ...
INFO: task syz-executor0:17084 blocked for more than 140 seconds.
      Not tainted 4.9.112-g9e79039 #7
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D29224 17084   3724 0x00000004
 ffff8801d75a4800 ffff8801ccdc9a40 ffff8801d495ea00 ffff88019ce0b000
 ffff8801db221c18 ffff8801ce177ce8 ffffffff839e907d ffff8801d75a50c8
 ffffed003aeb4a18 ffff8801d75a4800 00fffc0000000000 ffff8801db2224e8
Call Trace:
 [<ffffffff839ea67f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839eb003>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3590
 [<ffffffff839ef486>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff839ef486>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff815d818c>] __fdget_pos+0xac/0xd0 fs/file.c:781
 [<ffffffff8157687e>] fdget_pos include/linux/file.h:66 [inline]
 [<ffffffff8157687e>] SYSC_write fs/read_write.c:599 [inline]
 [<ffffffff8157687e>] SyS_write+0x7e/0x1c0 fs/read_write.c:596
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9f53>] 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: [<ffffffff8136675c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136675c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425de7>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3532:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d818c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3628:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f8122>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211edc2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor0/17084:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d818c>] __fdget_pos+0xac/0xd0 fs/file.c:781
1 lock held by syz-executor0/17091:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d818c>] __fdget_pos+0xac/0xd0 fs/file.c:781

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.112-g9e79039 #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d907fd08 ffffffff81eb3249 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9bd0 ffff8801d907fd40
 ffffffff81ebe547 0000000000000001 0000000000000000 0000000000000002
Call Trace:
 [<ffffffff81eb3249>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb3249>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebe547>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebe4da>] 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
 [<ffffffff81366cf4>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366cf4>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366cf4>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366cf4>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d0bd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fa11c>] 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: 17018 Comm: syz-executor0 Not tainted 4.9.112-g9e79039 #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c2bd3000 task.stack: ffff8801a8aa8000
RIP: 0010:[<ffffffff8135ea71>] 
c [<ffffffff8135ea71>] __sanitizer_cov_trace_pc+0x1/0x50 kernel/kcov.c:93
RSP: 0018:ffff8801a8aaf088  EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffea0006be0400 RCX: 1ffffffff0886680
RDX: 0000000000000000 RSI: ffffffff81f1acab RDI: ffffffff84433400
RBP: ffff8801a8aaf0f0 R08: ffff8801c2bd3988 R09: 0000000000000001
R10: ffff8801c2bd3000 R11: 1ffff1003857a72c R12: ffff88018fc07ce8
R13: dffffc0000000000 R14: ffffea0006be041c R15: ffffea0006be0400
FS:  00007f323242f700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbbd6f50000 CR3: 00000001c4c14000 CR4: 00000000001606f0
DR0: ffffffffffffffff DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffff8801a8aaf0f0
c ffffffff81438d00
c ffffffff81438be0
c ffffea0006be0420
c
 ffffea0006be0400
c 0000000000000008
c ffff8801d5d94890
c ffffea0006be0400
c
 0000000000000003
c 0000000000000007
c dffffc0000000000
c 0000000002420848
c
Call Trace:
 [<ffffffff8143a05b>] pagecache_get_page+0x4b/0x720 mm/filemap.c:1203
 [<ffffffff816253f9>] find_or_create_page include/linux/pagemap.h:309 [inline]
 [<ffffffff816253f9>] grow_dev_page fs/buffer.c:1005 [inline]
 [<ffffffff816253f9>] grow_buffers fs/buffer.c:1078 [inline]
 [<ffffffff816253f9>] __getblk_slow fs/buffer.c:1105 [inline]
 [<ffffffff816253f9>] __getblk_gfp+0x249/0x710 fs/buffer.c:1386
 [<ffffffff81628cdd>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818c4a1b>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818c4a1b>] fat12_ent_bread+0x13b/0x400 fs/fat/fatent.c:75
 [<ffffffff818c6eab>] fat_ent_read_block fs/fat/fatent.c:441 [inline]
 [<ffffffff818c6eab>] fat_alloc_clusters+0x51b/0xe10 fs/fat/fatent.c:489
 [<ffffffff818d407f>] fat_add_cluster+0x6f/0xe0 fs/fat/inode.c:100
 [<ffffffff818d43cf>] __fat_get_block fs/fat/inode.c:147 [inline]
 [<ffffffff818d43cf>] fat_get_block+0x2df/0x800 fs/fat/inode.c:176
 [<ffffffff81629f21>] __block_write_begin_int+0x391/0x1040 fs/buffer.c:1987
 [<ffffffff8162ac6f>] __block_write_begin fs/buffer.c:2038 [inline]
 [<ffffffff8162ac6f>] block_write_begin+0x5f/0x180 fs/buffer.c:2097
 [<ffffffff8162b283>] cont_write_begin+0x4f3/0x810 fs/buffer.c:2450
 [<ffffffff818d053a>] fat_write_begin+0x9a/0x120 fs/fat/inode.c:222
 [<ffffffff81435dc1>] generic_perform_write+0x301/0x510 mm/filemap.c:2740
 [<ffffffff8143d852>] __generic_file_write_iter+0x352/0x540 mm/filemap.c:2865
 [<ffffffff8143dd20>] generic_file_write_iter+0x2e0/0x610 mm/filemap.c:2893
 [<ffffffff8156ecb0>] new_sync_write fs/read_write.c:496 [inline]
 [<ffffffff8156ecb0>] __vfs_write+0x3e0/0x580 fs/read_write.c:509
 [<ffffffff81572aa7>] vfs_write+0x187/0x530 fs/read_write.c:557
 [<ffffffff815768d9>] SYSC_write fs/read_write.c:604 [inline]
 [<ffffffff815768d9>] SyS_write+0xd9/0x1c0 fs/read_write.c:596
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9f53>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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