device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
INFO: task init:16674 blocked for more than 120 seconds.
      Not tainted 4.9.97-g1321d42 #13
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
b_state=0x00000029, b_size=512
init            D
device loop0 blocksize: 4096
29000 16674      1 0x00000000
 ffff8801db221b98 ffff8801cb4af570 ffffffff839e375d ffffffff846d7ad8
 ffff8801cb4af518 ffffffff81f1874c 00ff8801cb4af630 ffff8801db222468
Call Trace:
 [<ffffffff839e4d5f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f1171>] schedule_timeout+0x861/0xf70 kernel/time/timer.c:1768
 [<ffffffff839ed88e>] __down_common kernel/locking/semaphore.c:221 [inline]
 [<ffffffff839ed88e>] __down+0x12e/0x1f0 kernel/locking/semaphore.c:238
 [<ffffffff81229f1e>] down+0x5e/0x80 kernel/locking/semaphore.c:61
 [<ffffffff812587dc>] console_lock+0x2c/0x80 kernel/printk/printk.c:2212
__find_get_block_slow() failed. block=1, b_blocknr=8
 [<ffffffff8125e04c>] console_device+0x1c/0xc0 kernel/printk/printk.c:2549
 [<ffffffff82116bfa>] tty_lookup_driver drivers/tty/tty_io.c:2003 [inline]
 [<ffffffff82116bfa>] tty_open_by_driver drivers/tty/tty_io.c:2048 [inline]
 [<ffffffff82116bfa>] tty_open+0x71a/0xe20 drivers/tty/tty_io.c:2125
 [<ffffffff8157c69d>] chrdev_open+0x22d/0x4c0 fs/char_dev.c:392
 [<ffffffff81567583>] do_dentry_open+0x703/0xc80 fs/open.c:766
b_state=0x00000029, b_size=512
 [<ffffffff8156ad6c>] vfs_open+0x11c/0x210 fs/open.c:879
device loop0 blocksize: 4096
 [<ffffffff815a1ea8>] do_last fs/namei.c:3410 [inline]
 [<ffffffff815a1ea8>] path_openat+0x758/0x3590 fs/namei.c:3534
 [<ffffffff815a8fa7>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156b77d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
 [<ffffffff8156ba5d>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8156ba5d>] SyS_open+0x2d/0x40 fs/open.c:1085
device loop0 blocksize: 4096
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f4653>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/518:
 #0:  (rcu_read_lock){......}, at: [<ffffffff813646ec>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813646ec>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81423ce0>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3623:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d579c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3720:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f2802>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff8211c8a2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
1 lock held by init/16674:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff8211694c>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff8211694c>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125
1 lock held by init/16675:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff8211694c>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff8211694c>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125
1 lock held by init/16676:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff8211694c>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff8211694c>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125
1 lock held by init/16677:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff8211694c>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff8211694c>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125
1 lock held by init/16678:
__find_get_block_slow() failed. block=1, b_blocknr=8
 #0: 
b_state=0x00000029, b_size=512
 (tty_mutex){+.+.+.}, at: [<ffffffff8211694c>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff8211694c>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125
device loop0 blocksize: 4096
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff8211694c>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff8211694c>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125

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

NMI backtrace for cpu 0
CPU: 0 PID: 518 Comm: khungtaskd Not tainted 4.9.97-g1321d42 #13
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8a0fd08 ffffffff81eb0b69 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b7d60 ffff8801d8a0fd40
 ffffffff81ebbe97 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb0b69>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb0b69>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
__find_get_block_slow() failed. block=1, b_blocknr=8
 [<ffffffff81ebbe97>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
b_state=0x00000029, b_size=512
 [<ffffffff81ebbe2a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b7e64>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81364c84>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81364c84>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81364c84>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81364c84>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
device loop0 blocksize: 4096
 [<ffffffff8119ad5d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f481c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 16665 Comm: syz-executor0 Not tainted 4.9.97-g1321d42 #13
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff880196423000 task.stack: ffff88019d2e0000
RIP: 0010:[<ffffffff811b9bed>] 
c [<ffffffff811b9bed>] get_lock_parent_ip include/linux/ftrace.h:721 [inline]
RIP: 0010:[<ffffffff811b9bed>] 
c [<ffffffff811b9bed>] preempt_latency_start kernel/sched/core.c:3228 [inline]
RIP: 0010:[<ffffffff811b9bed>] 
c [<ffffffff811b9bed>] preempt_count_add+0x7d/0x170 kernel/sched/core.c:3253
RSP: 0018:ffff88019d2e7110  EFLAGS: 00000287
RAX: 0000000000000001 RBX: ffffffff839f39d6 RCX: ffffc900009a2000
RDX: 0000000000000000 RSI: ffffffff816215e3 RDI: ffffffff839f39d6
RBP: ffff88019d2e7120 R08: ffff880196423938 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff10032c84722 R12: 0000000000000000
R13: ffffea00071a5340 R14: ffff8801bdb2cf18 R15: ffff8801cc3ea9d0
FS:  00007f4060bc5700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000693b10 CR3: 0000000192ccd000 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffff8801cc3eacd0
c 0000000000000000
c ffff88019d2e7140
c ffffffff839f39d6
c
 ffff8801bdb2cf18
c ffff8801cc3eabc8
c ffff88019d2e71a0
c ffffffff816215f6
c
 ffff8801cc3eaa94
c ffff8801cc3eacd0
c ffff8801cc3ea840
c 000000000000000f
c
Call Trace:
 [<ffffffff839f39d6>] __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline]
 [<ffffffff839f39d6>] _raw_spin_lock+0x16/0x50 kernel/locking/spinlock.c:151
 [<ffffffff816215f6>] spin_lock include/linux/spinlock.h:302 [inline]
 [<ffffffff816215f6>] __find_get_block_slow+0xe6/0x330 fs/buffer.c:216
 [<ffffffff81621b7e>] __find_get_block+0x23e/0x4c0 fs/buffer.c:1360
 [<ffffffff81622989>] __getblk_slow fs/buffer.c:1101 [inline]
 [<ffffffff81622989>] __getblk_gfp+0x189/0x710 fs/buffer.c:1386
 [<ffffffff8162632d>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818b3d38>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818b3d38>] fat__get_entry+0x4c8/0x8f0 fs/fat/dir.c:100
 [<ffffffff818b69c1>] fat_get_entry fs/fat/dir.c:128 [inline]
 [<ffffffff818b69c1>] fat_get_short_entry+0x131/0x2a0 fs/fat/dir.c:876
 [<ffffffff818b6f1d>] fat_scan+0xfd/0x340 fs/fat/dir.c:961
 [<ffffffff818de529>] msdos_find+0xf9/0x2d0 fs/fat/namei_msdos.c:128
 [<ffffffff818dee45>] msdos_lookup+0x135/0x250 fs/fat/namei_msdos.c:208
 [<ffffffff815925de>] lookup_slow+0x23e/0x470 fs/namei.c:1668
 [<ffffffff8159eb66>] walk_component+0x716/0x1bb0 fs/namei.c:1784
 [<ffffffff815a0889>] link_path_walk+0x889/0x1200 fs/namei.c:2120
 [<ffffffff815a14f4>] path_lookupat.isra.41+0x1b4/0x410 fs/namei.c:2282
 [<ffffffff815a36f9>] do_o_path fs/namei.c:3493 [inline]
 [<ffffffff815a36f9>] path_openat+0x1fa9/0x3590 fs/namei.c:3522
 [<ffffffff815a8fa7>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156b77d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8156baa0>] SYSC_openat fs/open.c:1099 [inline]
 [<ffffffff8156baa0>] SyS_openat+0x30/0x40 fs/open.c:1093
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f4653>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c
__find_get_block_slow() failed. block=1, b_blocknr=8