Free swap  = 0kB
Total swap = 0kB
1965979 pages RAM
0 pages HighMem/MovableOnly
313617 pages reserved
INFO: task init:5879 blocked for more than 140 seconds.
      Not tainted 4.9.141+ #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init            D
29336  5879      1 0x00000000
 ffff8801d3bdee00 ffff8801d3bdc200 ffff8801515697c0 ffff8801db621018
 ffff880145cf7738 ffffffff828075c2 0000000000000000 ffff88019b3288b0
 ffffed0033665115 00ff88019b328000 ffff8801db6218f0Call Trace:
 [<ffffffff82808aef>] schedule+0x7f/0x1b0 /kernel/sched/core.c:3553
 [<ffffffff828094a3>] schedule_preempt_disabled+0x13/0x20 /kernel/sched/core.c:3586
 [<ffffffff8280b51d>] __mutex_lock_common /kernel/locking/mutex.c:582 [inline]
 [<ffffffff8280b51d>] mutex_lock_nested+0x38d/0x900 /kernel/locking/mutex.c:621
 [<ffffffff81d2bb96>] tty_open_by_driver /drivers/tty/tty_io.c:2052 [inline]
 [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 /drivers/tty/tty_io.c:2130
 [<ffffffff81517bdd>] chrdev_open+0x22d/0x5c0 /fs/char_dev.c:392
 [<ffffffff81501e3f>] do_dentry_open+0x3ef/0xc90 /fs/open.c:766
 [<ffffffff8150576c>] vfs_open+0x11c/0x210 /fs/open.c:879
 [<ffffffff8153c542>] do_last /fs/namei.c:3410 [inline]
 [<ffffffff8153c542>] path_openat+0x542/0x2790 /fs/namei.c:3534
 [<ffffffff81541617>] do_filp_open+0x197/0x270 /fs/namei.c:3568
 [<ffffffff8150617d>] do_sys_open+0x30d/0x5c0 /fs/open.c:1072
 [<ffffffff8150645d>] SYSC_open /fs/open.c:1090 [inline]
 [<ffffffff8150645d>] SyS_open+0x2d/0x40 /fs/open.c:1085
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 /arch/x86/entry/common.c:285
 [<ffffffff82817893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/24:
 #0: 
 (rcu_read_lock){......}, at: [<ffffffff8131c2c0>] rcu_read_unlock /./include/linux/rcupdate.h:927 [inline]
 (rcu_read_lock){......}, at: [<ffffffff8131c2c0>] rcu_lock_break /kernel/hung_task.c:143 [inline]
 (rcu_read_lock){......}, at: [<ffffffff8131c2c0>] check_hung_uninterruptible_tasks /kernel/hung_task.c:177 [inline]
 (rcu_read_lock){......}, at: [<ffffffff8131c2c0>] watchdog+0x310/0xa20 /kernel/hung_task.c:239
 (tasklist_lock){.+.+..}, at: [<ffffffff813fe63f>] debug_show_all_locks+0x79/0x218 /kernel/locking/lockdep.c:4336
 #0: 
 (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8156cc7c>] __fdget_pos+0xac/0xd0 /fs/file.c:781
 #0: 
 (&tty->ldisc_sem){++++++}, at: [<ffffffff82815952>] ldsem_down_read+0x32/0x40 /drivers/tty/tty_ldsem.c:367
 (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81d37362>] n_tty_read+0x202/0x16e0 /drivers/tty/n_tty.c:2142
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open_by_driver /drivers/tty/tty_io.c:2052 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 /drivers/tty/tty_io.c:2130
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open_by_driver /drivers/tty/tty_io.c:2052 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 /drivers/tty/tty_io.c:2130
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open_by_driver /drivers/tty/tty_io.c:2052 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 /drivers/tty/tty_io.c:2130
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open_by_driver /drivers/tty/tty_io.c:2052 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 /drivers/tty/tty_io.c:2130
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open_by_driver /drivers/tty/tty_io.c:2052 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 /drivers/tty/tty_io.c:2130
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open_by_driver /drivers/tty/tty_io.c:2052 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 /drivers/tty/tty_io.c:2130
=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.141+ #1
 ffff8801d9907d08
 ffffffff81b42e79 0000000000000000 0000000000000001 0000000000000001
 0000000000000001 ffffffff810983b0 ffff8801d9907d40 ffffffff81b4df89
 0000000000000001 0000000000000000 0000000000000002Call Trace:
 [<ffffffff81b42e79>] __dump_stack /lib/dump_stack.c:15 [inline]
 [<ffffffff81b42e79>] dump_stack+0xc1/0x128 /lib/dump_stack.c:51
 [<ffffffff81b4df89>] nmi_cpu_backtrace.cold.0+0x48/0x87 /lib/nmi_backtrace.c:99
 [<ffffffff81b4df1c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 /lib/nmi_backtrace.c:60
 [<ffffffff810984b4>] arch_trigger_cpumask_backtrace+0x14/0x20 /arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131c65d>] trigger_all_cpu_backtrace /./include/linux/nmi.h:58 [inline]
 [<ffffffff8131c65d>] check_hung_task /kernel/hung_task.c:125 [inline]
 [<ffffffff8131c65d>] check_hung_uninterruptible_tasks /kernel/hung_task.c:182 [inline]
 [<ffffffff8131c65d>] watchdog+0x6ad/0xa20 /kernel/hung_task.c:239
 [<ffffffff81142c3d>] kthread+0x26d/0x300 /kernel/kthread.c:211
 [<ffffffff82817a5c>] 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: 2224 Comm: syz-executor751 Not tainted 4.9.141+ #1
task: ffff8801c7ca4740 task.stack: ffff8801c8638000
RIP: 0010:[<ffffffff81d6254b>] 
c [<ffffffff81d6254b>] io_serial_in+0x6b/0x90 /drivers/tty/serial/8250/8250_port.c:414
RSP: 0018:ffff8801c863f3a0  EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: ffffffff81d624f1 RDI: ffffffff84b5bb58
RBP: ffff8801c863f3b0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff84b5bb20
R13: 0000000000000020 R14: fffffbfff096b7ab R15: fffffbfff096b76d
FS:  00007f034787e700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004b4fc0 CR3: 00000001c881f000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff84b5bb20
c 000000000000270a
c ffff8801c863f400
c ffffffff81d64764
c
 ffff8801c863f3f0
c ffffffff84b5bb68
c ffffffff84b5bd5a
c ffffffff84b5bb20
c
 0000000000000035
c ffffffff81d648b0
c dffffc0000000000
c 0000000000000035
c
Call Trace:
 [<ffffffff81d64764>] serial_in /drivers/tty/serial/8250/8250.h:111 [inline]
 [<ffffffff81d64764>] wait_for_xmitr+0x94/0x1e0 /drivers/tty/serial/8250/8250_port.c:1997
 [<ffffffff81d648cf>] serial8250_console_putchar+0x1f/0x60 /drivers/tty/serial/8250/8250_port.c:3103
 [<ffffffff81d4cce9>] uart_console_write+0x59/0xf0 /drivers/tty/serial/serial_core.c:1866
 [<ffffffff81d6fae8>] serial8250_console_write+0x528/0x820 /drivers/tty/serial/8250/8250_port.c:3169
 [<ffffffff81d5d4ff>] univ8250_console_write+0x5f/0x70 /drivers/tty/serial/8250/8250_core.c:594
 [<ffffffff8122387d>] call_console_drivers.isra.0.constprop.15+0x1ad/0x360 /kernel/printk/printk.c:1594
 [<ffffffff812265af>] console_unlock+0x47f/0xb50 /kernel/printk/printk.c:2454
 [<ffffffff812270c8>] vprintk_emit+0x448/0x790 /kernel/printk/printk.c:1908
 [<ffffffff81227438>] vprintk+0x28/0x30 /kernel/printk/printk.c:1918
 [<ffffffff8122745d>] vprintk_default+0x1d/0x30 /kernel/printk/printk.c:1919
 [<ffffffff81402f9f>] vprintk_func /kernel/printk/internal.h:36 [inline]
 [<ffffffff81402f9f>] printk+0xaf/0xd7 /kernel/printk/printk.c:1980
 [<ffffffff814fc768>] warn_alloc.cold.31+0x1f/0x9c /mm/page_alloc.c:3058
 [<ffffffff814c9f8e>] __vmalloc_node_range+0x35e/0x600 /mm/vmalloc.c:1723
 [<ffffffff814ca71b>] __vmalloc_node /mm/vmalloc.c:1745 [inline]
 [<ffffffff814ca71b>] __vmalloc_node_flags /mm/vmalloc.c:1759 [inline]
 [<ffffffff814ca71b>] vmalloc+0x5b/0x70 /mm/vmalloc.c:1774
 [<ffffffff82450e91>] xt_alloc_entry_offsets+0x41/0x60 /net/netfilter/x_tables.c:758
 [<ffffffff82610ad5>] translate_table+0x215/0x1600 /net/ipv4/netfilter/ip_tables.c:705
 [<ffffffff826140be>] do_replace /net/ipv4/netfilter/ip_tables.c:1157 [inline]
 [<ffffffff826140be>] do_ipt_set_ctl+0x2ce/0x460 /net/ipv4/netfilter/ip_tables.c:1693
 [<ffffffff823e290d>] nf_sockopt /net/netfilter/nf_sockopt.c:105 [inline]
 [<ffffffff823e290d>] nf_setsockopt+0x6d/0xc0 /net/netfilter/nf_sockopt.c:114
 [<ffffffff824c1178>] ip_setsockopt+0x88/0xa0 /net/ipv4/ip_sockglue.c:1249
 [<ffffffff8256ce5a>] udp_setsockopt+0x4a/0x90 /net/ipv4/udp.c:2110
 [<ffffffff826f543a>] ipv6_setsockopt+0x10a/0x130 /net/ipv6/ipv6_sockglue.c:912
 [<ffffffff824deaa8>] tcp_setsockopt+0x88/0xe0 /net/ipv4/tcp.c:2758
 [<ffffffff822a747a>] sock_common_setsockopt+0x9a/0xe0 /net/core/sock.c:2706
 [<ffffffff822a4d76>] SYSC_setsockopt /net/socket.c:1785 [inline]
 [<ffffffff822a4d76>] SyS_setsockopt+0x166/0x260 /net/socket.c:1764
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 /arch/x86/entry/common.c:285
 [<ffffffff82817893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
c24 
cc9 
c00 
c00 
c00 
c49 
c8d 
c7c 
c24 
c38 
c48 
cb8 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c48 
c89 
cfa 
c48 
cc1 
cea 
c03 
cd3 
ce3 
c80 
c3c 
c02 
c00 
c75 
c17 
c41 
c03 
c5c 
c24 
c38 
c89 
cda 
cec 
c<5b> 
c0f 
cb6 
cc0 
c41 
c5c 
c5d 
cc3 
ce8 
ca8 
c0a 
c79 
cff 
ceb 
cc2 
ce8 
c01 
c0b 
c79 
cff 
ceb 
c