Free swap  = 0kB
Total swap = 0kB
1965979 pages RAM
0 pages HighMem/MovableOnly
313294 pages reserved
INFO: task init:24069 blocked for more than 140 seconds.
      Not tainted 4.4.174+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init            D ffff8800a4d77718 29280 24069      1 0x00000000
 ffff8800a4d77718 ffff8801d4ec17c0 ea7186d68e693273 ffff8801d4ec17c0
 0000000000000000 ffff8801d4ec2000 ffff8801db71f180 ffff8801db71f1a8
 ffff8801db71e898 ffff8801c17117c0 ffff8801d4ec17c0 ffffed00149ae001
Call Trace:
 [<ffffffff82709b79>] schedule+0x99/0x1d0 kernel/sched/core.c:3355
 [<ffffffff8270a333>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3388
 [<ffffffff8270c492>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8270c492>] mutex_lock_nested+0x3c2/0xb80 kernel/locking/mutex.c:621
 [<ffffffff81c8b2aa>] tty_open+0x56a/0xf50 drivers/tty/tty_io.c:2067
 [<ffffffff814a3ec0>] chrdev_open+0x230/0x630 fs/char_dev.c:388
 [<ffffffff8149154f>] do_dentry_open+0x38f/0xbd0 fs/open.c:749
 [<ffffffff81494d3b>] vfs_open+0x10b/0x210 fs/open.c:862
 [<ffffffff814c5ddf>] do_last fs/namei.c:3269 [inline]
 [<ffffffff814c5ddf>] path_openat+0x136f/0x4470 fs/namei.c:3406
 [<ffffffff814ccab1>] do_filp_open+0x1a1/0x270 fs/namei.c:3440
 [<ffffffff81495668>] do_sys_open+0x2f8/0x600 fs/open.c:1038
 [<ffffffff8149599d>] SYSC_open fs/open.c:1056 [inline]
 [<ffffffff8149599d>] SyS_open+0x2d/0x40 fs/open.c:1051
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
1 lock held by init/24069:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81c8b2aa>] tty_open+0x56a/0xf50 drivers/tty/tty_io.c:2067
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 2536 Comm: syz-executor.2 Not tainted 4.4.174+ #4
task: ffff8801bffb2f80 task.stack: ffff8801d1bd0000
RIP: 0010:[<ffffffff8101359c>]  [<ffffffff8101359c>] print_context_stack+0xac/0xd0 arch/x86/kernel/dumpstack.c:109
RSP: 0018:ffff8801d1bd6c50  EFLAGS: 00000246
RAX: ffffffff8102e480 RBX: ffff8801d1bd7aa8 RCX: 0000000000000000
RDX: ffff8801d1bd7aa8 RSI: ffffffff821d9e69 RDI: ffffffff821d9e69
RBP: ffff8801d1bd6c98 R08: ffff8801d1bd6d50 R09: 0000000000000000
R10: ffff8801d1bd7aa0 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8801d1bd6d50 R14: ffff8801d1bd7ff8 R15: ffff8801d1bd0000
FS:  00007effbac71700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001d3c4f8 CR3: 00000001d666a000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff821d9e69 ffff8801d1bd7aa0 ffff8801d1bd7aa0 ffffffff8280f0b0
 ffff8801d1bd6d50 ffffffff8280f0b0 ffff8801d1bd6cf0 ffff8801db607fc0
 0000000000000000 ffff8801d1bd6d28 ffffffff81012bb9 ffff8801d1bd6cec
Call Trace:
 [<ffffffff81012bb9>] dump_trace+0x179/0x390 arch/x86/kernel/dumpstack_64.c:243
 [<ffffffff8102e3c6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff81483f22>] save_stack mm/kasan/kasan.c:512 [inline]
 [<ffffffff81483f22>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff81483f22>] kasan_kmalloc.part.0+0x62/0xf0 mm/kasan/kasan.c:616
 [<ffffffff81484197>] kasan_kmalloc+0xb7/0xd0 mm/kasan/kasan.c:601
 [<ffffffff81484a40>] kasan_krealloc+0x60/0x80 mm/kasan/kasan.c:654
 [<ffffffff8147c8fa>] ksize+0x8a/0xf0 mm/slub.c:3727
 [<ffffffff821f7b69>] __alloc_skb+0x139/0x5d0 net/core/skbuff.c:237
 [<ffffffff821fe090>] alloc_skb include/linux/skbuff.h:820 [inline]
 [<ffffffff821fe090>] alloc_skb_with_frags+0xb0/0x4f0 net/core/skbuff.c:4540
 [<ffffffff821e2dc0>] sock_alloc_send_pskb+0x640/0x7d0 net/core/sock.c:1886
 [<ffffffff821e2f82>] sock_alloc_send_skb+0x32/0x40 net/core/sock.c:1903
 [<ffffffff823cabfa>] __ip_append_data.isra.0+0x1b4a/0x2a20 net/ipv4/ip_output.c:996
 [<ffffffff823d32ff>] ip_make_skb+0x1bf/0x210 net/ipv4/ip_output.c:1520
 [<ffffffff8247fb72>] udp_sendmsg+0x16a2/0x1c60 net/ipv4/udp.c:1067
 [<ffffffff8247e4d0>] ? udp_lib_unhash+0x630
NMI backtrace for cpu 1
CPU: 1 PID: 20 Comm: khungtaskd Not tainted 4.4.174+ #4
task: ffff8801da6f4740 task.stack: ffff8800001d0000
RIP: 0010:[<ffffffff8109b617>]  [<ffffffff8109b617>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:62 [inline]
RIP: 0010:[<ffffffff8109b617>]  [<ffffffff8109b617>] flat_send_IPI_mask+0xf7/0x1b0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800001d7c88  EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fc300
RBP: ffff8800001d7cb8 R08: 0000000000000018 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000003000000 R14: ffffffff82e5f2e0 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001d05f38 CR3: 00000001d5b2e000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000001 ffffffff82e5f2e0 ffffffff831a6ac0 fffffbfff0634c34
 000000000001b6c0 0000000000000008 ffff8800001d7cd8 ffffffff81092bee
 0000000000000008 ffffffff82924260 ffff8800001d7d30 ffffffff81ab8252
Call Trace:
 [<ffffffff81092bee>] nmi_raise_cpu_backtrace+0x5e/0x80 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81ab8252>] nmi_trigger_all_cpu_backtrace.cold+0xa1/0xae lib/nmi_backtrace.c:85
 [<ffffffff81092ca4>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff813b4762>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff813b4762>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff813b4762>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff813b4762>] watchdog.cold+0xd3/0xee kernel/hung_task.c:238
 [<ffffffff811342c3>] kthread+0x273/0x310 kernel/kthread.c:211
 [<ffffffff82718fc5>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:537
Code: 00 c3 5f ff 80 e6 10 75 e1 41 c1 e5 18 44 89 2c 25 10 c3 5f ff 44 89 fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 c3 5f ff <41> f7 c4 00 02 00 00 75 1e 4c 89 e7 57 9d 0f 1f 44 00 00 e8 f1