b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=2, b_blocknr=16
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
INFO: task init:1 blocked for more than 120 seconds.
      Not tainted 4.9.107-gdb2c520 #46
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init            D24344     1      0 0x00000004
 ffff8801d99b0000 ffff8801bab80fc0 ffff8801cda8c000 ffff8801baa94800
 ffff8801db321c18 ffff8801d99bf570 ffffffff839e8c1d 0000000000000000
 ffff8801d99b08ea ffff8801d99bf6d0 0000000000000046 ffff8801db3224e8
Call Trace:
 [<ffffffff839ea21f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f6631>] schedule_timeout+0x861/0xf70 kernel/time/timer.c:1768
 [<ffffffff839f2d4e>] __down_common kernel/locking/semaphore.c:221 [inline]
 [<ffffffff839f2d4e>] __down+0x12e/0x1f0 kernel/locking/semaphore.c:238
 [<ffffffff8122bcfe>] down+0x5e/0x80 kernel/locking/semaphore.c:61
 [<ffffffff8125a5bc>] console_lock+0x2c/0x80 kernel/printk/printk.c:2212
 [<ffffffff8125fe2c>] console_device+0x1c/0xc0 kernel/printk/printk.c:2549
 [<ffffffff82119fba>] tty_lookup_driver drivers/tty/tty_io.c:2003 [inline]
 [<ffffffff82119fba>] tty_open_by_driver drivers/tty/tty_io.c:2048 [inline]
 [<ffffffff82119fba>] tty_open+0x71a/0xe20 drivers/tty/tty_io.c:2125
 [<ffffffff8157ec8d>] chrdev_open+0x22d/0x4c0 fs/char_dev.c:392
 [<ffffffff81569b73>] do_dentry_open+0x703/0xc80 fs/open.c:766
 [<ffffffff8156d35c>] vfs_open+0x11c/0x210 fs/open.c:879
 [<ffffffff815a4498>] do_last fs/namei.c:3410 [inline]
 [<ffffffff815a4498>] path_openat+0x758/0x3590 fs/namei.c:3534
 [<ffffffff815ab597>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156dd6d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8156e04d>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8156e04d>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9b13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
1 lock held by init/1:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff82119d0c>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff82119d0c>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125
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
1 lock held by rsyslogd/3673:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d7fac>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3769:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f7cc2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211fc62>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor0/12391:
 #0:  (&sbi->fat_lock){+.+...}, at: [<ffffffff818c6d32>] lock_fat fs/fat/fatent.c:278 [inline]
 #0:  (&sbi->fat_lock){+.+...}, at: [<ffffffff818c6d32>] fat_count_free_clusters+0x122/0xa50 fs/fat/fatent.c:657
2 locks held by syz-executor0/12393:
 #0:  (sb_writers#11){.+.+.+}, at: [<ffffffff815e084f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#11){.+.+.+}, at: [<ffffffff815e084f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#16){++++++}, at: [<ffffffff8156a658>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#16){++++++}, at: [<ffffffff8156a658>] do_truncate2+0x128/0x1f0 fs/open.c:61

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.107-gdb2c520 #46
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8507d08 ffffffff81eb3da9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b96a0 ffff8801d8507d40
 ffffffff81ebf0a7 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb3da9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb3da9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebf0a7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebf03a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b97a4>] 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
 [<ffffffff839f9cdc>] 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: 12413 Comm: syz-executor6 Not tainted 4.9.107-gdb2c520 #46
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d567c800 task.stack: ffff880184928000
RIP: 0010:[<ffffffff821505bb>] 
c [<ffffffff821505bb>] inb arch/x86/include/asm/io.h:316 [inline]
RIP: 0010:[<ffffffff821505bb>] 
c [<ffffffff821505bb>] io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:414
RSP: 0018:ffff88018492f600  EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: ffffffff82150561 RDI: ffffffff864aaeb8
RBP: ffff88018492f610 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff864aae80
R13: 0000000000000020 R14: fffffbfff0c95617 R15: fffffbfff0c955d9
FS:  00007fcb8a3ab700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c421af1000 CR3: 00000001cd062000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff864aae80
c 000000000000270f
c ffff88018492f660
c ffffffff82152184
c
 ffffffff81edf098
c ffffffff864aaec8
c ffffffff864ab0ba
c ffffffff864aae80
c
 0000000000000030
c ffffffff821522d0
c dffffc0000000000
c 0000000000000030
c
Call Trace:
 [<ffffffff82152184>] serial_in drivers/tty/serial/8250/8250.h:111 [inline]
 [<ffffffff82152184>] wait_for_xmitr+0x94/0x1e0 drivers/tty/serial/8250/8250_port.c:1998
 [<ffffffff821522ef>] serial8250_console_putchar+0x1f/0x60 drivers/tty/serial/8250/8250_port.c:3104
 [<ffffffff8213ab19>] uart_console_write+0x59/0xf0 drivers/tty/serial/serial_core.c:1859
 [<ffffffff8215e508>] serial8250_console_write+0x528/0x820 drivers/tty/serial/8250/8250_port.c:3170
 [<ffffffff8214b06f>] univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:594
 [<ffffffff8125bc5d>] call_console_drivers.isra.18.constprop.28+0x1ad/0x360 kernel/printk/printk.c:1589
 [<ffffffff8125ea5f>] console_unlock+0x42f/0xb40 kernel/printk/printk.c:2449
 [<ffffffff8125f5b8>] vprintk_emit+0x448/0x790 kernel/printk/printk.c:1903
 [<ffffffff8125f928>] vprintk+0x28/0x30 kernel/printk/printk.c:1913
 [<ffffffff8125f94d>] vprintk_default+0x1d/0x30 kernel/printk/printk.c:1914
 [<ffffffff8142ca8c>] vprintk_func kernel/printk/internal.h:36 [inline]
 [<ffffffff8142ca8c>] printk+0xaf/0xd7 kernel/printk/printk.c:1975
 [<ffffffff839d2c74>] do_ip_vs_get_ctl.cold.37+0x16/0x20 net/netfilter/ipvs/ip_vs_ctl.c:2799
 [<ffffffff831df060>] nf_sockopt net/netfilter/nf_sockopt.c:103 [inline]
 [<ffffffff831df060>] nf_getsockopt+0x70/0xd0 net/netfilter/nf_sockopt.c:121
 [<ffffffff83345967>] ip_getsockopt+0x137/0x180 net/ipv4/ip_sockglue.c:1557
 [<ffffffff83365538>] tcp_getsockopt+0x88/0xe0 net/ipv4/tcp.c:3106
 [<ffffffff8301d34a>] sock_common_getsockopt+0x9a/0xe0 net/core/sock.c:2665
 [<ffffffff8301a760>] SYSC_getsockopt net/socket.c:1803 [inline]
 [<ffffffff8301a760>] SyS_getsockopt+0x150/0x240 net/socket.c:1785
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9b13>] 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 
c18 
cb4 
c3e 
cff 
ceb 
cc2 
ce8 
c71 
cb4 
c3e 
cff 
ceb 
c